JP7119514B2 - Easy-open packaging bag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging bag for sealing and preserving contents such as food, and more particularly to a packaging bag which is easy to open by tearing the packaging bag from the edge thereof and from which the contents can be easily taken out after opening.
Regarding.

Conventionally, there has been known a packaging bag in which laminated sheets mainly made of plastic resin are bonded together to form a bag, filled with contents, and sealed. The packaging bag is devised to facilitate opening by providing an I-shaped, V-shaped, or U-shaped notch at the side edge. There is also a packaging bag that can be resealed after being opened by attaching a resealing means such as a synthetic resin fastener in the vicinity of the opening. By providing such a resealing means in the packaging bag, the contents can be repeatedly sealed and stored even if the contents are not all consumed at once but are consumed several times.

In addition, to ensure that the tearing of the packaging bag proceeds in a straight line from the notch, it is widely practiced to provide an opening guide line by half-cutting or scratching the front and back laminated sheets, or to attach a straight-tear film. (For example, Patent Document 1).

Moreover, as an opening means, a packaging bag is known in which a group of scars is used instead of a V-shaped notch, thereby enlarging an area where tearing can be started. By enlarging the formation area of the scar group, there is an advantage that the tearing can be easily started without confirming the starting position of the tearing each time. In addition, the scar group has an advantage over the V-shaped notch and the U-shaped notch in that no shavings are produced during manufacturing. Due to such advantages, scar groups are being increasingly adopted as an opening means.

In Patent Document 2, a packaging bag has a linear cut line for opening the packaging bag from the outer edge of the peripheral heat-bonded portion, and the cut line is included in the peripheral heat-bonded portion to include the outer edge of the peripheral heat-bonded portion. A scar group area consisting of a plurality of fine puncture holes that penetrate the packaging bag from the inside is provided, and two independent guide means extending so as to taper toward the cut line are provided on the outer edge side. Disclosed is a packaging bag provided through the packaging bag so that both end portions sandwich the scar group region, and is torn accurately along the cut line from the tear start position without providing a notch in the peripheral heat-bonded portion. It is possible.

Japanese Patent Application Laid-Open No. 2001-264950 Japanese Patent No. 4686075

However, conventional packaging bags that combine notches and opening guide lines can be easily torn in a straight line, but the laminated sheets that make up the front and back of the packaging bag are torn in the same shape at the same position while overlapping. Therefore, it was difficult to pinch the overlapped portion with a finger to open it. In particular, in the case of a packaging bag having a synthetic resin fastener, the distance between the fastener and the torn portion is short, making it difficult to pinch with fingers, making it difficult to open the bag. In particular, it is extremely difficult for people with insufficient fingertip functions, such as children and the elderly. Moreover, even after being peeled open in this manner, similar problems reoccurred when the fastener was resealed and then re-opened.

In addition, when the unsealing guide line is provided on the front and back laminated sheets, it is difficult to accurately align the front and back positions. There is a risk that the tearing is not guided by the opening guide wire, and the tearing progresses in different parts of the bag, spilling the contents, staining the surroundings, and the like.

In addition, when a scar group is used as a trigger for tearing, as disclosed in Patent Document 2, it is not easy for a person with weak strength to start tearing compared to a notch, and the tear can be started from any position in the scar group. Since it is unstable whether it starts and it is difficult to accurately align the front and back of the cut line (opening guide line), the position of the cut line and the part guided by the two guide means are misaligned. There is a risk that the tear does not proceed along the cut line, and there is a risk that the contents will spill out due to the part that is not cut along the cut line. Also, even when the cut line is torn, if the cut lines provided on the front and back laminates are at the same position, it is also difficult to separate and open the front and back laminates after tearing. . In addition, since the strength in the vicinity of the scar group is originally low, if a guide means that penetrates the packaging bag is provided, the strength will be further reduced, and during transportation, etc., the packaging bag will be unintentionally cut open. is unsealed.

The present invention has been made to solve the various problems as described above. To provide a packaging bag in which a tear is properly connected to an opening guide line and the cut end can be easily opened after opening.

In order to solve the above problems, the invention according to claim 1 of the present invention is
A sealed portion formed by pasting the peripheral edges of a pair of laminated sheets folded in half, a storage portion for storing contents in an unsealed portion inside the sealed portion, and a pair of side ends and the unsealed portion therebetween. and opening means for opening the storage portion by cutting in a transverse manner, the packaging bag comprising:
The unsealing means includes a pair of unsealing starting portions comprising a pair of scar groups provided in the seal portions of the pair of side ends and a pair of cuts or notches provided in the edge, and the scar group. and an unsealing guide line provided on each of the front and back laminated sheets so as to have one end in one region and the other end in the other region,
When the packaging bag is viewed in the front and back direction, the unsealing guide lines are formed so that they extend substantially parallel to each other at predetermined intervals in the unsealed portion, and are located at the same or close positions at both ends. and
The scar group remains in the seal portion and does not reach the edge,
The notch or notch is provided in the seal portion and its tip reaches the area of the scar group,
A package characterized in that the one end of the opening guide wire within the region of the scar group is arranged at a position away from the cut or the notch, and the scar group is provided between the two. is a bag.

Further, the invention according to claim 2 of the present invention is
2. The packaging bag according to claim 1, further comprising resealing means for resealing the storage part after being opened by the opening means, on the side of the storage part relative to the opening means. be.

Further, the invention according to claim 3 of the present invention is
3. The packaging bag according to claim 1, wherein the opening guide line is a half-cut line.

Further, the invention according to claim 4 of the present invention is
4. The packaging bag according to claim 3, wherein the opening guide line is an intermittent line.

According to the invention of claim 1 of the present invention, when the packaging bag is opened, the seal portion can be easily torn from the notch or notch in the edge of one side end, leading to a group of scars. can easily reach the ends of the opening guide lines on the front and back at the same or close positions, can cut the opening guide lines on the front and back and reach the edge of the other side end to open the packaging bag, After unsealing, since the unsealing guide lines of the front and back laminated sheets extend substantially parallel at a predetermined interval in the unsealed portion, a step is formed at the unsealed cut, and the front and back laminated sheets can be easily separated and opened. It is possible to obtain a packaging bag from which the contents can be easily taken out from the storage part. In addition, since the scar group remains in the sealing part and does not reach the edge, the packaging bag is less likely to be accidentally opened from the scar group due to the external force applied during transportation or the internal pressure of the packaging bag.

Further, according to the second aspect of the invention, after the packaging bag is opened by the opening means, it can be resealed by the resealing means, and even if the contents cannot be used up at once, they are resealed and stored. We can provide packaging bags that can be

According to the third aspect of the invention, the unsealing guide line can be easily formed by a normal device such as laser irradiation without the need to add a special member, and can be provided by changing the position of the front and back laminates. can also be done easily.

Further, according to the fourth aspect of the present invention, it is possible to obtain a packaging bag that is less likely to be accidentally opened due to scratches caused by an external force applied during transportation or the like.

It is a plane schematic diagram of one embodiment of the packaging bag of the present invention. FIG. 4 is an enlarged view of a side seal portion of one embodiment of the packaging bag of the present invention; Fig. 2 is a perspective view of the packaging bag of the present invention in which the opening guide wire is cut; It is a cross-sectional schematic diagram of the packaging bag of this invention. FIG. 4 is an enlarged view of a side edge of each embodiment of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiments described below. Moreover, the same code|symbol is attached|subjected to the same member etc. below, and description may be abbreviate|omitted.

FIG. 1 is a schematic plan view of one embodiment of the packaging bag of the present invention. The packaging bag 10 consists of two substantially rectangular laminated sheets forming the front side and the back side, and the three sides of the substantially rectangular periphery are sealed to form side side seal portions 11 and 12, a bottom side seal portion 14, and an inner non-seal portion. The top side, which is the remaining one side of the substantially rectangular shape, is an opening 13 which can be used as a filling port for the contents, and after filling the contents, it is similarly sealed. can be sealed with Contents, such as foodstuffs, are enclosed in the accommodating part 15, for example.

The packaging bag 10 has a pair of unsealing starting portions 20 consisting of an I notch 21 and a group of scars 22 on the side seal portions 11 and 12 near the opening 13, and has an end portion in the region of the group of scars 22 on one side. Opening guide lines 23 and 24 which cross the non-sealed portion and reach the other group of scars 22 are provided on the laminated sheets, one of which is on the front side and the other of which is on the back side, respectively. The unsealing guide lines 23 and 24 are provided so as to be substantially parallel to each other at a predetermined interval when viewed from the direction of FIG.

FIG. 2 is an enlarged view of the unsealing start portion 20 of the side seal portion 11. As shown in FIG. Opening guide wire 23, 2
In the non-sealed portion, 4 extends substantially parallel with a predetermined interval, while in the vicinity of the end portion 25, it gradually approaches, and at the end portion 25, when the packaging bag 10 is seen in the direction in which the front and back are seen. 2(a), or close to each other as shown in FIG. 2(b). The same applies to the unsealing start portion 20 of the side seal portion 13 . It is optional which one is provided on the front side laminated sheet and which is provided on the back side laminated sheet. Also, which one is provided on the upper side is arbitrary.

I notches 21 are provided at the edges of the side seal portions 11, 12 to clearly indicate the tear initiation position and to facilitate the initiation of tearing. The shape may be V-shaped, U-shaped, or the like, in addition to the I-shape, and the tip of the incision reaches the area of the scar group 22 . In the drawing, the I-shape is drawn as a groove for easy understanding, but it may be a simple notch. The incisions are preferable because they do not produce slag during processing. These notches can be formed by punching the laminate sheet using a cutting edge of predetermined shape.

The scar group 22 is composed of a plurality of minute through holes or slits. The plurality of through-holes or slits may be arranged in a zigzag pattern, or may be arranged in rows in the horizontal direction, and may also be arranged in rows in the vertical direction in each row. The scar group 22 has a size that fits inside the side seal portions 11 and 12. For example, if the lateral width is t, the vertical height is v, and the width of the side seal portions 11 and 12 is s, then: It is preferable that t=s−4 mm and 4 mm≦v≦6 mm. Although the strength of the scar group 22 is low, since it is contained within the seal portion and does not reach the edge, for example, when an external force or internal pressure is applied during transportation, etc. Unpacking can be suppressed. Also, the opening guide lines 23 and 24 on the front and back can be arranged to be inside the scar group 22.例文帳に追加

In order to form the scar group 22, it is preferable to form it by, for example, puncturing with a needle. Moreover, the shape thereof may be a polygonal shape such as a triangle or rhombus, a circular shape, an elliptical shape, or the like, in addition to the shape of a slit line. When the piercing holes are used, it is preferable that the diameter is 0.1 to 0.5 mm and the distance between adjacent holes is 0.5 to 1.0 mm.

The opening guide lines 23 and 24 are linear grooves (notches) extending substantially parallel to each other, typically half-cut lines, and are formed by notching the surface of the laminated sheet 10, for example. The opening guide lines 23 and 24 can be formed by, for example, a die cutter or laser processing. Forming by laser processing is preferable because the curved portion of the unsealing guide line 23 can be easily formed. Also, the opening guide line may be formed in the inner layer of the laminated sheet 10 . It is preferable that the distance between the opening guide wires 23 and 24 that are substantially parallel to each other is about 1 mm to 4 mm. If the gap is narrower than 1 mm, it will be difficult to separate the front and back laminated sheets, and if the gap is about 4 mm, they can be separated easily. If the interval is too large, there is a risk that the tear from the scar group 22 will not communicate smoothly, and the volume of the storage section 15 will be reduced.

A resealing means 30 for resealing the storage portion 15 after opening is provided on the side of the storage portion 15 from the opening start portion 20 and the opening guide lines 23 and 24 . The resealing means 30 can appropriately employ a known structure capable of repeatedly opening and sealing. For example, it may be a fastener made of synthetic resin, or an adhesive seal, which can be repeatedly sealed by fitting a band-shaped protrusion into a band-shaped groove.

FIG. 3 is a perspective view showing a state in which the packaging bag 10 is torn apart from the opening start portion 20 along the opening guide lines 23 and 24 and opened. Since the opening guide lines 23 and 24 are provided substantially parallel to each other at a predetermined interval in the non-sealed portion with the laminated sheets on the front and back sides, a step d is generated in the opening guide lines 23 and 24, which also serves as a cut in the unsealed state. , The front and back laminated sheets can be easily separated in the direction of the white arrow by putting a finger 31 on the more protruding side (here, the opening guide line 24), etc.
The packaging bag 10 can be opened. When part of the contents is taken out after opening and the rest is to be preserved, it can be sealed again by closing the synthetic resin fastener as the resealing means 30 .

FIG. 4 is a schematic cross-sectional view of the packaging bag 10 taken along the arrow XX in FIG. A part of the cross section of the lamination sheets 1, 1' at the opening guide lines 23, 24 and the resealing means 30 is shown enlarged. The laminated sheets 1 and 1' can have a laminated structure in which, for example, the sealant layer 4, the intermediate layer 3 and the base layer 2 are laminated in this order from the inside of the bag. Examples of the sealant layer 4 include a film-like polyolefin resin. More specifically, low-density polyethylene resin, medium-density polyethylene resin, linear low-density polyethylene resin; ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, ethylene-methacrylic acid resin copolymer, etc. blended resins of polyethylene and polybutene; polypropylene resins such as homopolypropylene resins, propylene-ethylene random copolymers, propylene-ethylene block copolymers, and propylene-α-olefin copolymers. The sealant layer 4 may be formed of one of the above resins alone or in combination of two or more.

Examples of the intermediate layer 3 include various barrier films and aluminum foil. Gas barrier films such as polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol copolymer film, gas barrier nylon film, and gas barrier polyethylene terephthalate (PET) film; and an inorganic oxide deposited film obtained by depositing an inorganic oxide such as aluminum oxide or silicon oxide on a PET film. One of the above films may be used alone or in combination of two or more.

Examples of the substrate layer 2 include biaxially oriented films such as biaxially oriented polyethylene terephthalate (PET) films, biaxially oriented polypropylene (PP) films, and biaxially oriented nylon films. One of the above films may be used alone or in combination of two or more. The laminated structure of the laminated sheets 1, 1' is not limited to the embodiment shown in FIG. 4, and layers of various materials can be used according to the type of contents, the required level of airtightness, and the like.

The shape of the packaging bag 10 is not limited to the substantially rectangular three-sided seal bag described in the above embodiment, and may be a four-sided sealed bag, a pillow packaging bag, a standing pouch, or the like.

EXAMPLES The present invention will be described in more detail with reference to examples below.

<Common conditions>
The conditions common to each example and comparative example are as follows.
・ Structure of laminate Base layer: polyethylene terephthalate film (12 μm)
Intermediate layer: stretched nylon film (15 μm)
Sealant layer: unstretched polypropylene film (60 μm)
・The size of the packaging bag: 150 mm in the vertical direction and 100 mm in the horizontal direction.
・Seal part: Heat seal with a width of 8 mm.
・Notch: 3 mm cut by the cutter blade.
・5 pieces of each sample were prepared, and tearing was performed from the notch, and it was confirmed whether tearing could be performed along the opening guide line.
・The results are summarized in Table 1.

<Example 1>
A sample having the following shape as shown in FIG. 5(a) was prepared.
・Scratches: Through-holes with a diameter of 0.2 mm are staggered at intervals of 1 mm. The area is 6 mm in height and 4 mm in left and right.
・Opening guidance line: 4 mm between front and back by laser processing. Formed so that the end points are at the same position.

<Example 2>
A sample was prepared in the same manner as in Example 1, except that the distance between the end points of the laser processing of the opening guide line was set to about 2 mm, and the shape as shown in Fig. 5(b) was adopted.

<Comparative Example 1>
A sample was prepared by providing only an unsealing guide line in the same manner as in Example 1 without providing a group of scars.

<Comparative Example 2>
- A sample was prepared by providing only an unsealing guide line in the same manner as in Example 2 without providing a group of scars.

<Comparative Example 3>
・The sample was formed with only a notch, without forming a scar group or an opening guide line.

As can be seen from Table 1, the packaging bag having the configuration of the present invention can be torn along the opening guide line even if the positions of the front and back opening guide lines are slightly misaligned. I couldn't advance the rip cleanly.

Reference Signs List 1... Laminated sheet 2... Sealant layer 3... Intermediate layer 4... Base layer 10... Packaging bags 11, 12... Side edge sealing part 13... Opening part 14...・Bottom seal part 15... Storage part 20... Opening start part 21... I notch 22... Scar group 23, 24... Opening guide line 25... End part 30... Re-sealing Stop means 31: finger

Claims (4)

A sealed portion formed by pasting the peripheral edges of a pair of laminated sheets folded in half, a storage portion for storing contents in an unsealed portion inside the sealed portion, and a pair of side ends and the unsealed portion therebetween. and opening means for opening the storage portion by cutting in a transverse manner, the packaging bag comprising:
The unsealing means includes a pair of unsealing starting portions comprising a pair of scar groups provided in the seal portions of the pair of side ends and a pair of cuts or notches provided in the edge, and the scar group. and an unsealing guide line provided on each of the front and back laminated sheets so as to have one end in one region and the other end in the other region,
When the packaging bag is viewed in the front and back direction, the unsealing guide lines are formed so that they extend substantially parallel to each other at predetermined intervals in the unsealed portion, and are located at the same or close positions at both ends. and
The scar group remains in the seal portion and does not reach the edge,
The notch or notch is provided in the seal portion and its tip reaches the area of the scar group,
A package characterized in that the one end of the opening guide wire within the area of the scar group is arranged at a position away from the cut or notch, and the scar group is arranged between the two. bag. 2. The packaging bag according to claim 1, further comprising resealing means for resealing said storage part after being opened by said opening means, on the side of said storage part relative to said opening means. 3. The packaging bag according to claim 1, wherein the opening guide line is a half-cut line. 4. The packaging bag according to claim 3, wherein the opening guide line is an intermittent line.

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