JP2015105097A - Synthetic resin packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anti-static synthetic resin packaging bag with an opening/closing tool capable of satisfying anti-static property which hardly causes a bleeding-out phenomenon and a secular dissipation phenomenon, retention of function of the opening/closing tool, fixation of the opening/closing tool, simplicity of manufacturing, cost reduction and the like.SOLUTION: A pair of opening/closing tools 21A, 21B are in close vicinity to the upper edge part side of a bag main body 11 and are integrally formed on an inner surface of the bag main body 11. The main body 11 is made of an antistatic thermoplastic synthetic resin which contains a polymer type antistatic agent. The bag main body 11 has a surface resistivity of 10Ω/Sq or more and less than 10Ω/Sq. A pair of male and female opening/closing tools 21A, 21B are made of a thermoplastic synthetic resin which does not contain polymer type antistatic agent.

Description

  The present invention relates to a synthetic resin packaging bag (antistatic synthetic resin packaging bag with an opening / closing tool) that exhibits an appropriate antistatic effect over a long period of time while maintaining the stability of the reopening / closing function. It is. The present invention also relates to a synthetic resin packaging bag (antistatic synthetic resin packaging bag with an opening / closing tool) that satisfies the tactile sensation, ease of manufacturing difficulty, and low cost.

  As is well known, synthetic resin packaging bags are widely used in various fields. In particular, synthetic plastic packaging bags with an opening / closing tool (chuck) can be opened and closed at any time, and are highly evaluated in practical use.

In the technical field of packaging, countermeasures against static electricity have been regarded as important, including packaging bags made of synthetic resin. This is because unexpected troubles may be caused by the reasons outlined in (1) to (3) below.
(1) The electrical insulation bag (synthetic resin bag) is charged with static electricity due to handling such as friction, separation, and movement, and this causes dust to adhere to the bag.
(2) When electronic parts are packaged in an electrically insulating bag (synthetic resin bag) that is contaminated with dust, dust will also adhere to the electronic parts.
(3) Due to dust adhering to electronic components, electronic devices in information, electronics, precision fields, etc. cause malfunction (system failure).

  As one of the countermeasures against static electricity, adding a low molecular weight antistatic agent such as a low molecular weight surfactant to a thermoplastic synthetic resin which is a raw material of the bag has already been implemented. By the way, in the case of a bag made of a thermoplastic synthetic resin containing a low molecular weight antistatic agent such as a low molecular weight surfactant, it exhibits a reasonable antistatic effect, so the unexpected trouble described above may occur. I want to. In addition, the technical contents utilizing the low-molecular-weight surfactant can easily take measures and are low in cost.

  On the other hand, a synthetic resin bag containing a low molecular weight antistatic agent has a drawback that the antistatic effect disappears with time and a problem that the surfactant bleeds out to the outer surface or the inner surface of the bag.

  As another countermeasure against the static electricity described above, the packaging film disclosed in the following Patent Document 1 and the packaging bag disclosed in the following Patent Document 2 are ionic (anion, cation, amphoteric) or nonionic (non-ionic) Ion) polymer type antistatic agent is added to thermoplastic synthetic resin (raw material of film and bag) to prevent electrification that causes dust adhesion. This polymer type antistatic agent is desirable in that it does not cause a bleed-out phenomenon as seen in low molecular weight surfactants and exhibits a good antistatic effect over a long period of time. Therefore, it can be said that the polymeric antistatic agent can replace the low molecular weight surfactant as an antistatic agent for packaging films and packaging bags.

  In addition to this, the polymer type antistatic agent as an additive for the thermoplastic synthetic resin is also disclosed in the following Patent Documents 3 to 8.

However, the polymer-type antistatic agent has to solve several problems when it is used as an additive for a synthetic resin packaging bag with an opening / closing tool. This is because the following problems (4) and (5) occur when the bag and the opening / closing tool are formed by extrusion molding means.
(4) For a pair of male and female switches that have a special shape, and for a pair of male and female switches that require precise and high biting accuracy, a resin material (thermoplastic synthetic resin) with extremely good moldability is used. It is essential. On the other hand, the thermoplastic synthetic resin for an opening / closing tool contains a polymer type antistatic agent in an amount necessary for antistatic, so that the physical properties change and the moldability is considerably lowered. Due to this non-conformity, the molding finish of the opening / closing part is deteriorated, and the yield of non-defective packaging bags is lowered.
(5) As a countermeasure against the opening / closing tool, it can be proposed that the opening / closing tool is formed into a tape shape with a separate material having good moldability, and this is heat-bonded (heat sealed) to the inner surface of the bag containing the polymer antistatic agent. . However, because the thermoplastic synthetic resin for the bag also contains a polymer antistatic agent, the opening / closing device adhesion to the bag inner surface by the heat sealing means is not sufficient, and as a result, the bag inner surface and the opening / closing device inner surface There may be gaps that impede airtightness.

The packaging bag disclosed in Patent Document 2 adopts a double bag structure in order to solve the above problems. It has a double bag structure of an inner bag (thermoplastic synthetic resin) containing a polymer antistatic agent and an outer bag (thermoplastic synthetic resin) not containing a polymer antistatic agent. According to the technique of Patent Document 2, since the opening / closing tool is bonded to the inner surface of the opening portion of the outer bag that does not contain the polymer type antistatic agent, adhesion failure such as a gap does not occur. Therefore, in the case of this document technique, good results are achieved from the viewpoint of the adhesiveness of the opening / closing tool. However, considering the entire packaging bag, the technique of Patent Document 2 has the following problems (6) and (7).
(6) Since two bags, an inner bag and an outer bag, are required, the material cost increases, which increases the cost of the product.
(7) The number of processes from the manufacturing point of view, such as the process of making the inner bag, the process of making the outer bag, and the process of combining the two bags, is extremely low, resulting in low productivity. In addition, the union process of both bags is difficult. Of course, this also increases the cost of the product.

JP 2008-138116 A JP 2007-284114 A Japanese Patent Laid-Open No. 08-027344 Japanese Patent Laid-Open No. 08-104787 Japanese Patent Laid-Open No. 10-152528 JP 2010-132927 A JP 2013-189503 A JP 2013-194230 A

  In view of the technical problems as described above, the present invention has an antistatic property that prevents the bleed-out phenomenon and the disappearance phenomenon over time, the function retention of the switch, the fixability of the switch, the simplicity of manufacturing, the cost reduction, etc. It is an object of the present invention to provide a synthetic resin packaging bag (antistatic synthetic resin packaging bag) that can be satisfied.

The synthetic resin packaging bag according to the present invention is characterized by the technical contents described in the following items 1 to 4 as means for solving the problems to achieve the intended purpose.
<Section 1>
The bag body is made of an antistatic thermoplastic synthetic resin containing a polymer type antistatic agent, and the surface resistivity of the bag body is 10 ² Ω / Sq or more and less than 10 ¹⁰ Ω / Sq. And
A pair of male and female switches are made of a thermoplastic synthetic resin containing no polymer type antistatic agent, and
A pair of the opening and closing tools are integrally formed on the inner surface of the bag body in the vicinity of the upper end of the bag body.
<Section 2>
The bag body is made of an antistatic thermoplastic synthetic resin containing a polymer type antistatic agent, and the surface resistivity of the bag body is 10 ² Ω / Sq or more and less than 10 ¹⁰ Ω / Sq. And
The pair of switches is made of a static-damping thermoplastic synthetic resin containing a polymer type antistatic agent, and the pair of switches has a surface resistivity of 10 ¹⁰ Ω / Sq or more and 10 ¹³ Ω / Less than Sq, and
A pair of the opening and closing tools are integrally formed on the inner surface of the bag body in the vicinity of the upper end of the bag body.
<Section 3>
The bag body is made of an antistatic thermoplastic synthetic resin containing a polymer antistatic agent, and the surface resistivity of the bag body is 10 ² Ω / Sq or more and less than 10 ¹¹ Ω / Sq. And
The pair of switches is made of an antistatic thermoplastic synthetic resin containing a low molecular weight antistatic agent, and the surface resistivity of the pair of switches is 10 ² Ω / Sq or more and 10 ¹¹ Ω / Less than Sq, and
A pair of the opening and closing tools are integrally formed on the inner surface of the bag body in the vicinity of the upper end of the bag body.
<Section 4>
About the above-mentioned unused bag body before putting the package,
The upper end of the bag body is heat bonded and sealed, and
The lower end of the bag body is open to contain the article to be wrapped, and
Under the opening / closing tool in the bag body, a belt-shaped sealing member for heat bonding is interposed over both sides of the bag body, and both sides of the sealing member and both sides of the bag body are heated. An in-bag sealing portion is formed by bonding, and at least one surface of the sealing member forming the in-bag sealing portion is weakly bonded to the corresponding inner one surface of the bag body. ,and,
The synthetic resin according to any one of (1) to (3) above, wherein the opening / closing tool is enclosed between the sealed upper end portion of the bag body and the in-bag sealing portion. Packaging bag.
<Section 5>
One side of the seal member has an upper horizontally long non-bonded portion and a lower horizontally long weakly bonded portion, and one side of the seal member passes through the horizontally long weakly bonded portion of the bag body. Is weakly bonded to one inner surface, and
The other side of the seal member has an upper laterally strong adhesive portion and a lower laterally long non-adhered portion, and the other side of the seal member is attached to the bag body via the laterally strong adhesive portion. Strongly bonded to the other inner surface, and
For the sealing member when the bag body is turned upside down, the sealing member forms a bottom surface in the bag body. bag.

The synthetic resin packaging bag according to the present invention has the following effects <01> to <12>.
<01> The bag body in the present invention is made of an antistatic thermoplastic synthetic resin containing a polymer type antistatic agent, and has a surface resistivity of 10 ² Ω / Sq or more and 10 ¹⁰ Ω / It is less than Sq. Such an antistatic bag body is either not charged at all or is extremely difficult to be charged. Therefore, in the case of a synthetic resin packaging bag mainly composed of this bag body, this can be satisfactorily responded to when packaging an article that is not affected by static electricity.
<02> In the present invention, it is the above-described polymer type antistatic agent that is added to the bag body in order to prevent the antistatic. In the case of this polymer type antistatic agent, the bleed-out phenomenon hardly occurs and the antistatic effect does not disappear with time. Therefore, in the case of the synthetic resin packaging bag mainly composed of the bag body, the antistatic effect at a set level is constantly exhibited with a stable antistatic function over a long period of time.
<03> Regarding the molding of thermoplastic synthetic resins containing polymer antistatic agents, there is no problem when molding simple shapes such as films and sheets, but molding precise and advanced shapes. When doing, molding defects tend to occur. Incidentally, in the case of an opening / closing tool (a male / female pair) integrally formed on the inner surface of the bag body, airtightness at the time of closing and smoothness at the time of opening / closing operations are required, and therefore it belongs to a precise and advanced molded product. In one embodiment, the pair of male and female switches in the present invention are made of a thermoplastic synthetic resin that does not contain a polymer antistatic agent. The opening / closing device of such a material improves the moldability by not containing a polymer type antistatic agent, and even if it is a precise and advanced opening / closing device, it is molded well and integrated with the inner surface of the bag body. It can be made. Therefore, the opening / closing tool with respect to the bag body has a good fixability, and due to its high formability, the opening / closing tool satisfies the airtightness during closing and the smoothness during opening / closing operation.
<04> As another embodiment, a pair of male and female switches in the present invention is made of a static-damping thermoplastic synthetic resin containing a polymer type antistatic agent, and has a surface resistivity of 10 ¹¹ Ω / Sq or more and less than 10 ¹³ Ω / Sq. This static-damping thermoplastic synthetic resin is desirable in terms of static electricity countermeasures in that it has predetermined electrical characteristics as compared with an electrically insulating thermoplastic synthetic resin. On the other hand, it seems that the moldability of this thermoplastic synthetic resin is lowered. However, in the case of a thermoplastic synthetic resin having a surface specific resistance value of 10 ¹¹ Ω / Sq or more and less than 10 ¹³ Ω / Sq, the surface specific resistance value can be obtained with a small amount of the polymeric antistatic agent. Therefore, the influence of the polymer type antistatic agent on the moldability of the resin is small. Therefore, even a precise and sophisticated opening / closing tool can be molded without causing molding defects.
<05> As an example other than the above, a pair of male and female switches in the present invention is made of an antistatic thermoplastic synthetic resin containing a low molecular weight antistatic agent, and has a surface resistivity value. Is 10 ² Ω / Sq or more and less than 10 ¹¹ Ω / Sq. The opening / closing device made of thermoplastic synthetic resin containing surfactant is more preferable than the opening / closing device made of thermoplastic synthetic resin having electrical insulation in terms of static electricity countermeasures for the entire bag including the opening / closing device. About the property, it is more desirable than the thermoplastic synthetic resin opening / closing tool having a polymer type antistatic property. On the other hand, in the case of this thermoplastic synthetic resin containing a surfactant, it can be said that a bleedout phenomenon occurs due to a change over time. However, since the thermoplastic synthetic resin containing a surfactant is used as a constituent material, it is limited to a small member (elongated member) called a pair of male and female switches, and it is present inside the bag body. Even if a bleed-out phenomenon occurs, the effect of this is very small. Of course, the bleed-out phenomenon does not occur on the bag surface side. Therefore, a pair of opening / closing tools provided in the bag body made of a thermoplastic synthetic resin containing a surfactant can also be used for packaging articles while eliminating the influence of static electricity.
<06> When the synthetic resin packaging bag according to the present invention is in a state before putting the packaged item (when not in use), the lower end of the bag body is usually opened to put the packaged item The upper end is closed by heat bonding (heat sealing). In one example of the present invention, in this bag body that is closed at the upper end and opened at the lower end, an in-bag seal portion is formed under the opening / closing tool in the bag body. In terms of the pair of opening / closing tools, the pair of opening / closing tools is sealed between the closed bag upper end portion and the bag seal portion and blocked from the outside. The pair of opening / closing tools enclosed in this way are not easily charged even if they are electrical insulators, and dust adsorption due to static electricity is unlikely to occur. When the pair of opening / closing tools is made of a static-damping thermoplastic synthetic resin or a thermoplastic synthetic resin containing a surfactant, such an effect becomes more prominent.
<07> In the case of the in-bag seal portion formed under the opening / closing tool in the bag body, at least one surface is weakly bonded to the corresponding inner surface of the bag body. In this case, after the upper end portion of the bag is cut and the pair of opening / closing tools are opened while the in-bag seal portion (weak adhesion) is opened, the opening can be easily performed due to weak adhesion.
<08> In one embodiment, the in-bag seal portion under the opening / closing tool of the bag body is formed mainly of a heat-sealing seal member having a belt shape. One embodiment of the sealing member for heat bonding in this case is as follows. That is, the sealing member for heat bonding has an upper horizontally long non-bonded portion and a lower horizontally long weakly bonded portion on one side, and an upper horizontally long strong bonded portion and a lower horizontally long non-bonded portion on the other side. It has. Then, one side of the seal member is weakly bonded to one inner surface of the bag body through the laterally long weakly bonded portion, and the other side of the seal member is bonded to the other side of the bag body via the laterally long strong bonded portion. By being strongly bonded to the inner surface of the bag, an in-bag seal portion is formed. Furthermore, in the bag body in the upside down state of closing the upper end and opening the lower end, when the bag seal part formed under the opening / closing tool of the bag body is such, the bag seal part is While being the inner bottom of the bag body in the upside down state, it serves as a shielding type protective wall for the pair of opening and closing tools to protect the opening and closing tools. Therefore, when a packaged object is put or packed into the bag body from the opened lower end, the packaged object collides with a pair of opening / closing tools to open it, or a pair of fine packaged objects It is possible to avoid the occurrence of problems such as biting between the opening and closing tools.
<09> A pair of opening / closing tools formed integrally with the bag body is desirable in the following respects. First, as for a pair of opening / closing tools that do not contain a polymer type antistatic agent, this has good moldability and good fixability to the bag body. Next, regarding a pair of opening / closing tools containing a low molecular weight antistatic agent, this also has good moldability and good fixability to the bag body. Furthermore, a pair of opening / closing devices containing a polymer antistatic agent so as to satisfy a surface resistivity of 10 ² Ω / Sq or more and less than 10 ¹¹ Ω / Sq also has a high content of the polymer antistatic agent. Since it is suppressed, it has moldability and fixability equivalent to the above.
<10> Resin molding including the integration of the bag body and the opening / closing tool is stable in terms of material and other factors, which reduces the difficulty of manufacturing bags. As a result, the yield rate is increased, and as a result, the yield can be improved.
<11> The polymer-type antistatic agent contained in the bag body is such that the bleed-out phenomenon hardly occurs when viewed over time. Therefore, in the case of a bag main body, the surface etc. do not become sticky and can maintain favorable tactile sensation.
<12> The above-mentioned yield improvement leads to product cost reduction. In addition, the polymer antistatic agent added to the bag body is not an ultra-cheap agent, but it exhibits sufficient antistatic properties even if its content in the bag body is suppressed to a small amount of around 16 wt%. Therefore, this does not become a cost push factor. Therefore, this can be satisfied also for cost reduction of the product.

It is the front view (figure A) and sectional drawing (figure B) which showed the bag upside down about one Embodiment of the synthetic resin packaging bags concerning this invention. About other one embodiment of the synthetic resin packaging bag according to the present invention, the bag is shown upside down, schematically showing the intermediate part omitted state (FIG. A) and the intermediate part omitted state sectional view (FIG. B). ) And a sectional view of the seal member (FIG. C).

  An embodiment of an antistatic synthetic resin packaging bag with an opening / closing tool according to the present invention will be described with reference to the accompanying drawings.

  1A and 1B, an antistatic synthetic resin packaging bag with an opening and closing tool, 11 is a bag body made of thermoplastic synthetic resin, and 31x and 31y are male and female made of thermoplastic synthetic resin. A pair of opening and closing tools are shown. In this case, the thermoplastic synthetic resin may be referred to as a thermoplastic plastic. Therefore, the terms “synthetic resin” and “plastic” are synonymous in the present invention. On the other hand, in the case of a pair of male and female opening / closing tools 31x and 31y, they may be referred to as chucks, fasteners (fasteners), zippers (zippers) or the like.

In FIG. 1, a thermoplastic synthetic resin having a planar shape as a constituent material of the bag body 11 is composed of a single layer film as an example, and a multilayer film in which a plurality of single layer films are bonded as another example. is there. The planar thermoplastic synthetic resin made of a single layer film has a thickness of about 50 to 250 μm, and the planar thermoplastic synthetic resin made of a multilayer film has a thickness of about 150 to 750 μm. is there. Furthermore, as the thermoplastic synthetic resin layer in this case, any one of those exemplified in the following <21> to <49> is adopted. As a typical example, low density polyethylene is adopted as a constituent material of the bag body 11. On the other hand, as for the pair of male and female opening / closing tools 31x and 31y, any one of those exemplified in the following <21> to <49> is adopted. As a typical example, low density polyethylene is adopted as a constituent material of both the opening / closing tools 31x and 31y. For the thermoplastic synthetic resin for the bag body and the thermoplastic synthetic resin for the opening and closing device, the types of both thermoplastic synthetic resins may be different, but usually the same type as both thermoplastic synthetic resins, Alternatively, the same type is used. In addition to the thermoplastic synthetic resin layer that is a constituent material of the bag body 11 and the both opening / closing tools 31x and 31y, two or more types arbitrarily selected from those exemplified in the following <21> to <49> May be made of a mixed resin. Of course, necessary additives such as an antistatic agent are added to the thermoplastic synthetic resin layer, which is a constituent material of the bag body 11 and the both opening / closing tools 31x and 31y. These additives will be described in detail later.
<21> High density polyethylene (HDPE) / Polyethylene (PE)
<22> Medium density polyethylene (MDPE) / polyethylene (PE)
<23> Low density polyethylene (LDPE) / polyethylene (PE)
<24> Polypropylene (PP)
<25> Polyvinylidene chloride (PVDC)
<26> Polyvinyl chloride (PVC)
<27> Polystyrene (PS)
<28> Polyvinyl acetate (PVAc)
<29> Polytetrafluoroethylene (PTFE)
<30> ABS resin (acrylonitrile butadiene styrene resin)
<31> AS resin (SAN)
<32> Acrylic resin (PMMA)
<33> Polyamide (PA) / Nylon name
<34> Polyacetal (POM)
<35> Polycarbonate (PC)
<36> Modified polyphenylene ether (m-PPE, modified PPE, PPO)
<37> Polybutylene terephthalate (PBT)
<38> Polyethylene terephthalate (PET)
<39> Cyclic polyolefin (COP)
<40> Polyphenylene sulfide (PPS)
<41> Polysulfone (PSF)
<42> Polyethersulfone (PES)
<43> Amorphous polyarylate (PAR)
<44> Liquid crystal polymer (LCP)
<45> Polyetheretherketone (PEEK)
<46> Thermoplastic polyimide (PI)
<47> Polyamideimide (PAI)
<48> Thermoplastic polyurethane (TPU)
<49> Fluororesin (PTFE)

  As described above, in the case of the bag body 11 and the both opening / closing tools 31x and 31y, additives corresponding thereto are added in order to provide required characteristics. It may be an organic additive or an inorganic additive. Specific examples of some of these additives include antistatic agents, ultraviolet absorbers, antioxidants, and light-shielding agents. By the way, ultraviolet absorbers, antioxidants, light-shielding agents, etc. can be combined with the broader term of weathering agent. Therefore, when it is called a weather resistance agent, it has one or more additive functions selected from ultraviolet absorbers, antioxidants, and light-shielding agents. In addition, the same or the same kind of substance may have two or more functions as additives. In the following specific additive examples, such substances are listed in multiple locations. Other specific examples of additives include gas barrier agents, plasticizers, weathering agents, lubricants, anti-blocking agents, flavoring agents, flame retardants, antifogging agents, dispersants, mold release agents, polymerization additives (polymerization initiators) )-Fluidity improvers and the like can be mentioned, and these can also be added to thermoplastic synthetic resins for bag bodies and opening / closing devices. The various additives listed below are all known or well known.

  Since the antistatic agent is indispensable for the bag body 11, the antistatic agent is always added to the thermoplastic synthetic resin for the bag body. Moreover, in the case of this antistatic agent for a bag body, since it is necessary to be a high molecular antistatic agent, for example, a low molecular antistatic agent such as a low molecular surfactant is not employed. In the case of a polymer type antistatic agent added to a thermoplastic synthetic resin for a bag body, whether it is ionic (anionic, cationic, amphoteric) or nonionic (nonionic) Good. Specific examples of these are as follows. Examples of the anionic polymer type antistatic agent include “polystyrene sulfonic acid type”. Examples of the cationic polymer type antistatic agent include “quaternary ammonium base-containing acrylate polymer type”. Examples of the amphoteric polymer type antistatic agent include “sulfobetaine type”. In particular, as the ionic polymer type antistatic agent, those composed of “ionomer composition (ionic polymer)”, especially those composed of “potassium ionomer” are often employed. On the other hand, examples of the nonionic polymer type antistatic agent include “polyethylene oxide type” and “ethylene oxide-epichlorohydrin type”. In addition, as long as the antistatic agent added to the thermoplastic synthetic resin for the bag body is a polymer type, the polymer type surfactant is also employed.

A pair of opening / closing tool 31x * 31y does not contain an antistatic agent as an example as an additive. In the case of both the opening / closing tools 31x and 31y that do not contain the antistatic agent, they may have conductivity by adding additives other than the antistatic agent. Moreover, both the opening / closing tools 31x and 31y may show electrical insulation. The closing device 31x · 31y without the antistatic agent are those whose surface resistivity exhibits conductivity in less than 10 ¹³ Ω / Sq, its surface resistivity electrical insulation at 10 ¹³ Ω / Sq more It shows sex.

The pair of opening / closing tools 31x and 31y includes an antistatic agent as an additive as another example. There are two types of antistatic agents that are added to the thermoplastic synthetic resin for opening and closing devices. One is a polymer antistatic agent and the other is a low molecular antistatic agent. As the polymer antistatic agent added to the thermoplastic synthetic resin for the opening / closing tool, the same polymer antistatic agent as described for the thermoplastic synthetic resin for the bag body is employed. However, in the case of a polymeric antistatic agent added to a thermoplastic synthetic resin for a switch, the amount added is higher than that of a thermoplastic synthetic resin for a bag body in order to maintain the resin moldability of the switch. Greatly reduced weight. Incidentally, when the addition amount of the polymer antistatic agent to the thermoplastic synthetic resin for the bag body is “1”, the addition amount of the polymer antistatic agent to the thermoplastic synthetic resin for the opening / closing device is “1/20”. ”To“ 1/5 ”. In the case of a thermoplastic synthetic resin for switchgear to which a polymer type antistatic agent is added within this range, the surface specific resistance value is 10 ¹¹ Ω / Sq or more and less than 10 ¹³ Ω / Sq, and the electrostatic attenuation property is reduced. It will have. An ionic (anionic, cationic, amphoteric) or nonionic (nonionic) low molecular weight antistatic agent added to a thermoplastic synthetic resin for an opening / closing tool is arbitrarily employed. These are often low molecular surfactants. Specific examples of the ionic or nonionic low molecular weight antistatic agent are as follows.
[Anionic low molecular weight antistatic agent (low molecular weight surfactant)]
Alkyl sulfonates Alkyl benzene sulphonates Alkyl osphosphates [Canionic low molecular weight antistatic agents (low molecular weight surfactants)]
Tetraalkylammonium salt Trialkylbenzylammonium salt [Amotropic low molecular weight antistatic agent (low molecular weight surfactant)]
Alkylbetaine Alkylimidazolium Betaine [Nonionic Low Molecular Weight Antistatic Agent (Low Molecular Weight Surfactant)]
Glycerin fatty acid ester Polyoxyalkylene alkyl ether Polyoxyethylene alkyl phenyl ether Alkyl ether ether Hydroxyalkyl monoethanolamine Polyoxyethylene alkylamine Polyoxyethylene alkylamine fatty acid ester Fatty acid diethanolamide

Organic additives and inorganic additives as shown below are arbitrarily selected and added to the thermoplastic synthetic resin for the bag body. Of course, when adding multiple types of additives, in principle, there are combinations that do not reduce or negate the effects of the additives, or combinations that do not cause functional conflicts between the additives. Selected. An additive as shown below is arbitrarily selected and added to a thermoplastic synthetic resin for an opening / closing tool as long as the moldability is not hindered. However, in the case of a thermoplastic synthetic resin for an opening / closing tool, addition of an ultraviolet absorber, an ultraviolet scattering agent, a light shielding agent, etc. is often omitted. In addition, when the additive shown below causes bleeding out, addition to the resin may be omitted. However, when the bag body 11 is made of a laminated film having a three-layer structure, an additive that causes bleed-out may be added to the film of the intermediate layer.
[Ultraviolet absorber (ultraviolet scattering agent)]
・ Low molecular weight benzotriazole UV absorber (molecular weight 200-400)
・ Low molecular weight triazine UV absorber (molecular weight 200-400)
・ Low molecular weight benzoate UV absorber (molecular weight 200-400)
・ High molecular weight benzotriazole UV absorber (molecular weight 10000 or more)
・ High molecular weight triazine UV absorber (Molecular weight 10000 or more)
・ High molecular weight benzoate UV absorber (molecular weight 10000 or more)
・ Zinc oxide (fine particles)
・ Zinc oxide (fine particles) surface-treated with silicone
・ Zinc oxide (fine particles) with ceramic surface treatment
・ Titanium oxide (rutile fine particles)
・ Titanium oxide (anatase fine particles)
-Octyl methoxycinnamate-Octyl dimethoxybenzylidene dioxoimidazolidine propionate-Diethylaminohydroxybenzoyl hexyl benzoate-t-butylmethoxydibenzoylmethane-Octyl triazone-2-ethylhexyl paramethoxycinnamate [Antioxidant]
・ Phenolic antioxidants (radical scavengers)
・ Sulfur antioxidants (peroxide decomposition agents)
・ Phosphorus antioxidant (peroxide decomposition agent)
・ Precious metal fine particles (platinum, gold, ruthenium, rhodium, palladium, osmium, iridium, etc.)
・ Mainly iron powder (sprayed iron powder, sea surface iron powder, electrolytic iron powder, iron grinding powder, pulverized iron, etc.), metal halide (alkaline metal chloride, alkaline earth metal chloride, bromide, iodide) Etc.) [weatherproofing agent]
・ Organic polysilane ・ Polyphyrin compound ・ Metal complex of polysilane and polyphyrin compound ・ Cerium oxide ・ Phenol compound ・ Hindered phenol compound ・ Hindered amine compound ・ Hydtalcite-like compound ・ White pigment (zinc oxide, titanium oxide, water) (Aluminium oxide, antimony white, lithopone, olzinc flower, gypsum, barite, scum, basic lead carbonate, etc.)
・ Other pigments (calcium carbonate, calcined clay, silica, aluminosilicate, diatomaceous earth, talc, titanium oxide, barium sulfate, aluminum oxide = alumina, magnesium oxide = magnesia, etc.)
[Shading agent]
・ Organic dyes (styryl dyes, anthraquinone dyes, indoaniline dyes)
・ Organic pigments (azo lakes, insoluble azos, condensed azos, phthalocyanines,
Quinacridone, dioxazine, isoindolinone, anthraquinone, perinone, thioindico, perylene, etc.)
・ Light-absorbing inorganic pigments (carbon black, iron black, carbon balloon, iron oxide, etc.)
-Light-reflective inorganic pigment (titanium oxide, white carbon, zinc oxide, zinc powder, aluminum powder, calcium carbonate, shirasu balloon, glass balloon, silica, zeolite, magnesium carbonate, chromium oxide, zirconia, titania, alumina, magnesia, clay , Kaolin, calcium silicate, barium sulfate, glass sphere, etc.)
[Lubricant]
・ Silicone compounds ・ Hydrocarbon compounds ・ Higher alcohol compounds ・ Higher fatty acid compounds

  Additives for thermoplastic synthetic resins for bag bodies include gas barrier agents, plasticizers, weathering agents, blocking agents, fragrances, flame retardants, antifogging agents, dispersants, mold release agents, fluidity improvers, and polymerization As the additives for use, known or well-known additives can be adopted at the present time, and those known or well-known additives can be appropriately selected and adopted. These additives are also employed as required in thermoplastic synthetic resins for opening and closing devices.

About the addition amount of the main additive in the above, it sets within the following ranges with respect to 100 weight part of resin.
Organic UV absorber = 0.001 to 15 parts by weight Inorganic UV absorber = 0.01 to 50 parts by weight Antioxidant = 0.001 to 3 parts by weight Shading agent = 0.05 to 10 parts by weight Gas barrier agent = 1-15 parts by weight Plasticizer = 10-90 parts by weight Weathering agent = 0.01-50 parts by weight Antistatic agent = 0.1-20 parts by weight Lubricant = 0.005-5 parts by weight Antiblocking agent = 0. 01 to 40 parts by weight Flavoring agent = 0.001 to 10 parts by weight Flame retardant = 0.01 to 100 parts by weight Antifogging agent = 0.5 to 5 parts by weight Dispersant = 0.05 to 5 parts by weight Release agent = 0.001 to 5 parts by weight Fluidity improver = 0.05 to 5 parts by weight Polymerization additive (polymerization initiator) = 0.1 to 5 parts by weight Foaming agent (chemical foaming agent) = 0.1 to 20 parts by weight Part

In the following additives selected for addition to the thermoplastic synthetic resin for the bag body and the thermoplastic synthetic resin for the opening / closing device, one agent also serves as a plurality of additives.
[Glycerin fatty acid ester / monoglyceride]
Lubricant, antistatic agent, antifogging agent, plasticizer, dispersant, mold release agent, antiblocking agent, fluidity improver, polymerization additive [glycerin fatty acid ester / acetylated monoglyceride]
Plasticizer, fluidity improver [glycerin fatty acid ester / organic acid monoglyceride]
Lubricant, antistatic agent, antifogging agent, mold release agent [glycerin fatty acid ester / medium chain fatty acid triglyceride]
Plasticizer, fluidity improver [polyglycerin fatty acid ester]
Lubricant, antistatic agent, antifogging agent, dispersant, mold release agent, antiblocking agent, fluidity improver, polymerization additive [sorbitan fatty acid ester]
Lubricant, antistatic agent, antifogging agent, plasticizer, dispersant, mold release agent, antiblocking agent, fluidity improver, polymerization additive [propylene glycol fatty acid ester]
Lubricant, plasticizer, mold release agent, fluidity improver [special fatty acid ester]
Lubricant, dispersant, mold release agent, anti-blocking agent, fluidity improver [higher alcohol fatty acid ester]
Lubricant, dispersant, mold release agent, fluidity improver [ethylene oxide adduct / polyoxyethylene sorbitan fatty acid ester]
Antistatic agent, antifogging agent, dispersant [ethylene oxide adduct / polyoxyethylene glycerin fatty acid ester]
Antistatic agent, antifogging agent, dispersant

  The above-mentioned additives are added to the thermoplastic synthetic resin by a well-known “kneading” means. In this case, a master batch is prepared in advance. That is, a master batch is prepared by mixing an additive made of powder with a resin at a predetermined discount value. Then, when melt-kneading the resin in an extrusion molding machine, a master batch is added to homogenize the entire resin, and the resin is extruded to produce a film for a bag body such as a bag surface film and a bag lining film. Further, at this time, the molded product is merged while extruding a predetermined resin by a well-known coextrusion method, whereby the female opening / closing tool 31x and the male opening / closing tool 31y are respectively integrated with the inner surfaces of the bag outer film and bag lining film. Then, a film with a female opening / closing tool and a film with a male opening / closing tool are formed. As is well known, each film is supplied to the production line to produce a packaging bag with an opening / closing tool.

  What was illustrated by FIG. 1 as one Embodiment of the antistatic type synthetic resin packaging bag with an opening / closing tool which concerns on this invention has comprised the following bag structures.

  1 (A) and 1 (B), the bag body 11 is shown upside down, but the normal bag posture is upside down from this illustration. As is apparent with reference to FIGS. 1A and 1B, the bag body 11 includes a pair of front and back films 12x and 12y, such as a bag outer cover and a bag inner cover, and a pair of male and female that can be opened and closed freely. The tools 31x and 31y are the main components. In the relationship between the two films 12x and 12y and the two opening / closing tools 31x and 31y, as an example, the female opening / closing tool 31x is integrally formed on the inner surface of the bag surface film 12x, and the male opening / closing tool is formed on the inner surface of the bag lining film 12y. 31y is integrally formed. In this regard, the male opening / closing tool 31y may be integrally formed on the inner surface of the bag surface film 12x, or the female opening / closing tool 31x may be integrally formed on the inner surface of the bag lining film 12y.

  The bag body 11 illustrated in FIGS. 1A and 1B is further described. This is because the side seal portions 13a and 13a are formed by heat bonding means (heat seal means) on both sides of the two films 12x and 12y that are overlapped with each other. 13b is formed, and further, a top seal portion (upper seal portion) 14 is formed by heat bonding means (heat seal means) on the upper end portions of the films 12x and 12y that are overlapped with each other, thereby forming a bag-like shape. It is finished to a structure. The pair of male and female opening / closing tools 31x and 31y at this time bite each other and are in a closed state. On the other hand, the lower end portion of the bag main body 11 is opened to put an article to be packaged into the bag main body 11 from here. About the lower end part in the open state of the bag main body 11, after putting the to-be-packaged material PK in the inside of the bag main body 11, as shown schematically in FIG. It is sealed (closed) by a sealing means. Therefore, a bottom seal portion (under seal portion) 15 is formed at the lower end portion of the bag body 11 after the packaged item is packed in the bag.

Both the film 12x and the film 12y illustrated in FIG. 1 contain a polymer type antistatic agent as an indispensable additive, and in addition, an arbitrary number of additives selected from the additives described above. It is contained. Both the film 12x and the film 12y containing the polymer type antistatic agent have obvious antistatic properties, and the bag body 11 constituted by the both films 12x and 12y also has antistatic properties. The surface specific resistance value of the bag body 11 is 10 ² Ω / Sq or more and less than 10 ¹⁰ Ω / Sq. The antistatic property of the bag body 11 is increased when the content of the polymer antistatic agent is increased, and is decreased when the content of the polymer antistatic agent is decreased. The surface specific resistance value of the bag body 11 is set to a desired value.

The pair of male and female opening / closing tools 31x and 31y in FIG. 1 are antistatic, for example. The antistatic opening / closing tools 31x and 31y have different surface specific resistance values depending on whether the antistatic agent contained therein is a polymer or a low molecule. Incidentally, in the case of the antistatic opening / closing device 31x / 31y containing a polymer antistatic agent, the surface resistivity value is 10 ¹¹ Ω / Sq or more and less than 10 ¹³ Ω / Sq, and low molecular charging In the case of the antistatic opening / closing tools 31x and 31y containing an inhibitor, the surface specific resistance value is 10 ² Ω / Sq or more and less than 10 ¹⁰ Ω / Sq, as with the bag body 11. As another example, in the case of the opening / closing tools 31x and 31y made of an electrically insulating thermoplastic resin, the surface specific resistance value is 10 ¹³ Ω / Sq or more.

  In the case of the one illustrated in FIG. 2 as another embodiment of the antistatic synthetic resin packaging bag with an opening / closing tool according to the present invention, the bag structure is basically the same as that of FIG. However, it differs from that of FIG. 1 in the following points.

  2A and 2B, the bag body 11 is shown upside down, but the normal bag posture is upside down from this illustration. As is apparent with reference to FIGS. 2 (A) and 2 (B), a belt-shaped sealing member 51 for heat bonding is provided on both sides of the bag body 11 below the both opening / closing tools 31 x and 31 y in the bag body 11. The both sides of this seal member 51 and the both inner surfaces of the bag body 11 (the inner surfaces of the films 12x and 12y) are heat-bonded (heat sealed) to form an in-bag seal portion 52. Regarding the bonding mode in this case, one side of the sealing member 51 forming the in-bag seal portion 52 is weakly bonded to the corresponding inner side of the bag body 11 (the inner surface of the bag surface film 12x). . Further, the other side of the sealing member 51 forming the in-bag sealing portion 52 is weakly or strongly bonded to the corresponding inner side of the bag body 11 (the inner surface of the bag lining film 12y). ing. In this embodiment, the pair of male and female opening / closing tools 31x and 31y are sealed between the sealed upper end portion (top seal portion 14) of the bag body 11 and the in-bag seal portion 52.

  The belt-like sealing member 51 that is a member for heat bonding is described in detail below with reference to FIG.

  The number of layers of the sealing member 51 may be either a single number or a plurality, but in consideration of adhesiveness with both films 12x and 12y, a multi-layered material is often preferentially used. The multi-layer sealing member 51 has a laminated structure of two or more layers as is obvious. Incidentally, the sealing member 51 illustrated in FIG. 2C has a three-layer structure. Of the three layers, one is a horizontally-long belt-like low adhesive layer 53, the other is a horizontally-long belt-like high adhesive layer 54, and the other is a horizontally-long belt-like intermediate layer 55. The three layers are laminated and integrated in such a manner that an intermediate layer 55 is interposed between the low adhesion layer 53 and the high adhesion layer 54. In the case of each layer in the sealing member 51, the thickness per layer is, for example, about 100 to 200 μm. The total thickness of the seal member 51 having a three-layer structure is about 300 to 800 μm. In some embodiments, there is also a sealing member 51 in which the total thickness of each layer is less than 300 μm, and there is also a sealing member 51 in which the total thickness of each layer exceeds 800 μm. Of course, the sealing member 51 has a two-layer structure. As an example of the sealing member 51 having a two-layer structure, for example, in the sealing member 51 having the three-layer structure, the intermediate layer 55 is omitted and the low adhesive layer 53 and the high adhesive layer 54 are directly laminated. is there.

  The above-mentioned laminated sealing member 51 made of synthetic resin is produced by any one of the extrusion laminating method, the dry laminating method, the co-extrusion method, the laminating method other than these, or a combination of these methods. It is. This type of laminating method includes hot melt laminating, coating polylaminating, wet laminating, thermal laminating and the like. Further, in the case of the sealing member 51 made of a combination of a non-synthetic resin material and a synthetic resin material, for example, a synthetic resin material layer is bonded or formed on the surface of the non-synthetic resin material layer. Then, the sealing member 51 having a laminated structure is produced.

  Regarding the synthetic resin sealing member 51 shown in FIG. 2 (C) composed of the low adhesive layer 53, the high adhesive layer 54, and the intermediate layer 55, the respective layers 53, 54, and 55 are as follows.

  The low adhesion layer 53 is an important factor that determines the easy peelability (weak adhesion) of the seal member 51. When the low adhesion layer 53 of the sealing member 51 is made of synthetic resin and the inner surface side of one film (12x or 12y) corresponding to weak adhesion is also made of synthetic resin, the synthetic resin film (12x or 12y) The low adhesion layer 53 made of synthetic resin with respect to the inner surface is bonded so as to be any one of these peeling types such as an interlayer peeling type, a cohesive peeling type, and an interface peeling type. More specifically, the low adhesion layer 53 is bonded to the other side by a room temperature pressure bonding means (pressure bonding means) or a heat welding means (pressure heat welding means). The low adhesion layer 53 adhered to the inner surface of the synthetic resin film (12x or 12y) by the room temperature pressure bonding means is made of a synthetic resin and made of an adhesive-based adhesive material as a representative example. In the case of the low adhesion layer 53 adhered to the inner surface of the synthetic resin film (12x or 12y) by means of heat welding, it consists mainly of a blend polymer in which a plurality of different types of polymers are blended. In the case of the latter low adhesion layer 53, the combination of polymers to be blended (different polymer blends) and the blending ratio of each polymer are set depending on the peeling type such as delamination type, cohesive peeling type, and interfacial peeling type. To be required. The adhesive strength (easily peelable) with the other synthetic resin film relating to the latter low adhesion layer 53 also includes the same kind of polymer as the synthetic resin film (12x or 12y), in other words, It depends on how much polymer is different from the film (12x or 12y). Further, the latter low adhesion layer 53 can change its easy peelability after heat welding in various ways by adjusting the temperature, pressure, pressurizing time, etc. when heat-welding with the synthetic resin film. . Thus, for the latter low adhesive layer 53, since there are many parameters that determine its easy peelability (weak adhesiveness), easy peelability is set based on part or all of it. From the viewpoint of different types of polymer blends, two different types of synthetic resin components, or three or more different types of synthetic resin components from among the various types of thermoplastic synthetic resins listed in both films 12x and 12y are used. Consists of things. Specific examples of the low adhesion layer 53 include a mixture of a polyethylene resin and a polypropylene resin in an appropriate ratio, a polyethylene resin, a polypropylene resin, and an ethylene vinyl acetate copolymer resin. Of course, the low adhesion layer 53 is not limited to this example, and two or more types of resin are selected from the thermoplastic synthetic resins described above. To be blended.

  The main role of the high adhesion layer 54 in the seal member 51 is to reliably and stably fix the seal member 51 to the film to be bonded. Therefore, the material of the high adhesion layer 54 is strongly bonded to any of the above-mentioned films (12x or 12y) corresponding to the high adhesion layer 54, or is completely bonded and integrated. It is desirable. By the way, if the high adhesion layer 54 is made of the same synthetic resin as the film (12x or 12y) to be bonded, by bonding the high adhesion layer 54 and the film (12x or 12y) with the above-mentioned heat welding means, Both of these are bonded and integrated almost completely. For this reason, the same thermoplastic synthetic resin as the adhesive partner film (12x or 12y) is used as the material of the high adhesion layer 54. Since the specific thermoplastic synthetic resin in that case is the same as that described in the material description of both films 12x and 12y, description thereof will be omitted by referring to it.

  The main role of the intermediate layer 55 in the seal member 51 is to adjust the physical properties, particularly mechanical and chemical properties of the seal member 51 including flexibility, elasticity, rigidity, strength, heat resistance, processing stability, and others. It is. As the material of the intermediate layer 55, when the low adhesive layer 53 and the high adhesive layer 54 are made of a thermoplastic synthetic resin, a thermoplastic synthetic resin is used. What is used as the material of the intermediate layer 55 is also adopted from those listed as the material description of both films 12x and 12y. Some specific examples are thermoplastic synthetic resins such as polyethylene terephthalate and polyimide. The intermediate layer 55 interposed between the low adhesion layer 53 and the high adhesion layer 54 may be a single layer or multiple layers. However, when the number of layers is excessively increased, not only the cost is increased, but undesired bulkiness / strengthening occurs at the level of the seal member 51. Therefore, the number of intermediate layers 55 may be about 1 to 2.

  The sealing member 51 having a laminated structure is formed by any means such as bonding, coating, and coextrusion, regardless of whether it has a two-layer structure or a three-layer structure. Moreover, the seal member 51 has a strip shape. When the sealing member 51 produced in this way has a two-layer structure of the low adhesion layer 53 and the high adhesion layer 54, the low adhesion layer 53 and the high adhesion layer 54 are strong even if they are weakly adhered. It may be bonded. Furthermore, when the sealing member 51 has a multilayer structure (laminated structure of three or more layers) of the low adhesive layer 53, the high adhesive layer 54, and the intermediate layer 55, the low adhesive layer 53, the intermediate layer 55, May be weakly bonded or strongly bonded. One side (layer surface) of the low-adhesion layer 53 is exposed on one band-like surface of the sealing member 51 having a band shape in a laminated structure, and one side (layer surface) of the high-adhesion layer 54 is exposed on the other band-like surface. Exposed. Such exposed surface of each layer serves as an adhesive surface for both films 12x and 12y. In this case, when one film 12x (inner surface) and the seal member low adhesive layer 53 are bonded, or when the other film 12y (inner surface) and the seal member high adhesive layer 54 are bonded, the bonding mode is " “Partially bonded and the remaining non-bonded”. Alternatively, “full adhesion” may be adopted as the bonding mode of one seal member surface (single side), or “partially bonded and remaining non-bonded” may be used as the bonding mode of the other sealing member surface (single side). is there.

  In the embodiment of FIGS. 2A and 2B, the in-bag sealing portion 52 by the sealing member 51 is provided under both the opening / closing tools 31x and 31y as a laminated adhesive structure in the bag main body 11. That is, in the case of this embodiment, in the bag body 11 in which the sealing member 51 is disposed over the width direction inside the bag, the inner surface of the film 12x and the layer surface of the low adhesion layer 53 are relatively bonded, and the film 12y The inner surface and the layer surface of the high adhesion layer 54 are relatively bonded to each other. In the case of the in-bag seal portion 52 formed in this way, the adhesion between the low adhesion layer 53 and the film 12x becomes the weak adhesion with easy peeling, and the adhesion between the high adhesion layer 54 and the film 12y has the high adhesion strength. It becomes adhesion.

  The bag seal portion 52 is further described with reference to FIGS. 2A, 2B, and 2C as follows. When the seal member 51 is based on the state of FIG. 2C that is not inverted upside down, one side (the low adhesive layer 53) of the seal member 51 is relatively lower than the relatively long horizontally long non-bonded portion NL. The laterally long weakly bonded portion WL. One side of such a seal member 51 is weakly bonded to one inner surface of the bag body 11 (eg, the inner surface of the bag surface film 12x) via the horizontally long weakly bonded portion WL. On the other hand, the other side of the seal member (high adhesion layer 54) also has the upper horizontally long strongly bonded portion SL and the lower horizontally long non-overlapping when the state of FIG. It has adhesion part ML. The other one surface of the sealing member 51 is strongly bonded to the other inner surface of the bag body 11 through the horizontally long strong bonding portion SL. Thus, in the bag main body 11, an in-bag seal portion 52 mainly composed of the seal member 51 is formed.

  In the case of the seal member 51 illustrated in FIG. 2, the dimensions of the horizontally long non-bonded portion NL and the horizontally long weakly bonded portion WL on one side thereof, and the horizontally long strong bonded portion SL and the lower horizontally long nonbonded portion on the other side thereof. The dimensional relationship with ML is [horizontally long non-bonded portion NL> horizontal long weakly bonded portion WL] or [horizontal long non-bonded portion ML> horizontal long strong bonded portion SL]. = Long horizontally weakly bonded portion WL] or [Long horizontally strong bonded portion SL> Long horizontally long non-bonded portion ML], or [Long horizontally long non-bonded portion ML = Long horizontally long strongly bonded portion] or [Long horizontally long strongly bonded portion SL> Long horizontally long non-bonded portion ML]. It may be.

  The in-bag seal portion 52 in the embodiment of FIG. 2 forms a sealed space portion 56 in the bag body 11 in cooperation with the top seal portion 14. Therefore, in the case of the pair of male and female opening / closing tools 31x and 31y in the sealed space portion 56, the package PK is packed in the bag or the bottom seal portion 15 is applied, and then the package PK is taken out. Until the top seal portion 14 is cut off, it is sealed in the sealed space portion 56 to be protected from dust adhesion contamination and the like, which leads to measures against contamination of the package PK. .

  In the embodiment of FIG. 2, the sealing member 51 forming the in-bag seal portion 52 becomes a temporary or temporary bottom surface portion 57 when the bag body 11 is in an upside down state as shown in FIG. It is. This is because the seal member 51 is bonded to the inner surfaces of both the films 12x and 12y through the horizontally long weakly bonded portion WL and the horizontally long strong bonded portion SL. That is, in the case of the bottom surface portion 57 formed of such a seal member 51, when the bag body 11 is inflated so as to bag the article to be packaged PK from the lower end side in the open state, the laterally weak adhesive portion WL · This is because the horizontally long non-bonded portion NL (ML), the horizontally long strong bonded portion SL, and the like are in a crank bent state, and the horizontally long non-bonded portion NL (ML) forms a substantially horizontal flat surface. When such a bottom surface portion 57 is obtained, the bag body 11 swells easily when the packaged item PK is put in the bag, and the packaged item put into the bag body 11 when the packaged item PK is packed in the bag. Since the object PK does not collide with both the opened / closed tools 31x and 31y in the closed state, the both opened and closed tools 31x and 31y are not opened when the packaged item PK is packed.

In the antistatic synthetic resin packaging bag with an opening and closing device shown in the embodiment of FIG. 1 and the embodiment of FIG. 2, the bag body 11 and both opening and closing devices 31x and 31y are, for example, the following materials or Made of blended materials.
[About the bag body 11]
・ Main raw materials (low density polyethylene)
51-65% by weight
・ Flowing agent (glycerin fatty acid ester)
0.2-0.6% by weight
Metallocene polyethylene 15-25% by weight
・ Antistatic agent (Trade name ENTILA)
8-24% by weight
・ Lubricant (glycerin fatty acid ester)
2.5-7.5% by weight
・ Anti-blocking lubricant (polyglycerin fatty acid ester)
0.3-1.0% by weight
[About a pair of male and female switches 31x and 31y]
・ Main raw materials (low density polyethylene)
90-100% by weight
・ Balance (optional additive)
0-10% by weight

A more specific example of the above is as follows.
[About the bag body 11]
・ Main raw material (low density polyethylene) 58.2% by weight
・ Flowing agent 0.4% by weight
-Metallocene polyethylene 20.0% by weight
・ Lubricant 4.9% by weight
・ Antistatic agent (Trade name ENTILA) 16.0 wt%
・ Anti-blocking lubricant 0.5% by weight
[About a pair of male and female switches 31x and 31y]
・ Main raw material (low density polyethylene) 100% by weight

In the above specific example, the low-density polyethylene as the main raw material is advantageous in terms of moldability and cost. Metallocene polyethylene can secure heat seal strength or strength against impact. The antistatic agent (trade name ENTILA) can reduce the surface resistance value of the bag inner surface to 10 ¹⁰ Ω / Sq or less while avoiding an increase in cost. The lubricant improves the slip of the film when the films 12x and 12y are formed and produced. The anti-blocking lubricant prevents the film from being baked in the mold when the both films 12x and 12y are formed and produced, and improves the sliding of the film.

  The antistatic synthetic resin packaging bag with an opening / closing tool according to the present invention relies on an antistatic agent added to the bag body, and exhibits a high level of antistatic properties. Therefore, it becomes useful and useful in the field of packaging an article to be packaged while satisfying a high degree of antistatic property. Therefore, it can be said that the industrial applicability is high.

DESCRIPTION OF SYMBOLS 11 Bag main body 12x Bag surface film 12y Bag lining film 13a Side seal part 13b Side seal part 14 Top seal part 15 Bottom seal part 31x Female type opening / closing tool 31y Male type opening / closing tool 51 Seal member 52 In-bag sealing part 53 Low adhesion layer 54 High adhesive layer 55 Intermediate layer 56 Sealed space portion 57 Bottom portion NL Horizontally long non-bonded portion WL Horizontally weakly bonded portion ML Horizontally long non-bonded portion SL Horizontally long strongly bonded portion PK Package

Claims (5)

The bag body is made of an antistatic thermoplastic synthetic resin containing a polymer antistatic agent, and the surface resistivity of the bag body is 10 ² Ω / Sq or more and less than 10 ¹¹ Ω / Sq. And
A pair of male and female switches are made of a thermoplastic synthetic resin containing no polymer type antistatic agent, and
A pair of the opening and closing tools are integrally formed on the inner surface of the bag body in the vicinity of the upper end of the bag body. The bag body is made of an antistatic thermoplastic synthetic resin containing a polymer antistatic agent, and the surface resistivity of the bag body is 10 ² Ω / Sq or more and less than 10 ¹¹ Ω / Sq. And
The pair of switches is made of a static-damping thermoplastic synthetic resin containing a polymer type antistatic agent, and the surface resistivity of the pair of switches is 10 ¹¹ Ω / Sq or more and 10 ¹³ Ω / Less than Sq, and
A pair of the opening and closing tools are integrally formed on the inner surface of the bag body in the vicinity of the upper end of the bag body. The bag body is made of an antistatic thermoplastic synthetic resin containing a polymer antistatic agent, and the surface resistivity of the bag body is 10 ² Ω / Sq or more and less than 10 ¹¹ Ω / Sq. And
The pair of switches is made of an antistatic thermoplastic synthetic resin containing a low molecular weight antistatic agent, and the surface resistivity of the pair of switches is 10 ² Ω / Sq or more and 10 ¹¹ Ω / Less than Sq, and
A pair of the opening and closing tools are integrally formed on the inner surface of the bag body in the vicinity of the upper end of the bag body. About the above-mentioned unused bag body before putting the package,
The upper end of the bag body is heat bonded and sealed, and
The lower end of the bag body is open to contain the article to be wrapped, and
Under the opening / closing tool in the bag body, a belt-shaped sealing member for heat bonding is interposed over both sides of the bag body, and both sides of the sealing member and both sides of the bag body are heated. An in-bag sealing portion is formed by bonding, and at least one surface of the sealing member forming the in-bag sealing portion is weakly bonded to the corresponding inner one surface of the bag body. ,and,
The synthetic resin packaging bag according to any one of claims 1 to 3, wherein the opening / closing tool is sealed between a sealed upper end portion of the bag body and the in-bag sealing portion. . One side of the seal member has an upper horizontally long non-bonded portion and a lower horizontally long weakly bonded portion, and one side of the seal member passes through the horizontally long weakly bonded portion of the bag body. Is weakly bonded to one inner surface, and
The other side of the seal member has an upper laterally strong adhesive portion and a lower laterally long non-adhered portion, and the other side of the seal member is attached to the bag body via the laterally strong adhesive portion. Strongly bonded to the other inner surface, and
5. The synthetic resin packaging bag according to claim 4, wherein the sealing member when the bag body is turned upside down forms a bottom surface in the bag body. .

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