JP2006022900A - Gasket material, gasket material manufacturing method and gasket mounting method - Google Patents

Abstract

Disclosed is a gasket material that is less likely to be deformed when attached to a sealed part, has good attachment workability, and is low in manufacturing cost, a manufacturing method thereof, and a gasket attaching method that has good sealing properties and is inexpensive. .
An elastic gasket made of a thermoplastic elastomer is fixed to one side of a resin film not subjected to surface release treatment by injection molding under the condition that the resin film is not fused to the gasket. A gasket material that is easy to peel off is obtained. The exposed surface of the elastic gasket is fixed to a sealed portion, and then the resin film is peeled off from the elastic gasket, or the gasket is held by a fixing jig and the support film is peeled off. After the exposed surface is positioned at the site to be sealed and fixed to the site to be sealed, the fixing jig is removed to easily attach a gasket having a good sealing property to the portion to be sealed.
[Selection] Figure 4

Description

  The gasket of the present invention includes a gasket for sealing between a lid and a main body of a hard disk drive (HDD), a gasket for sealing between separators of a fuel cell, an electronic device mounted on a communication device such as a mobile phone, an OA device, and an automobile. The present invention relates to a gasket for the purpose of sealing necessary for protection of various electronic products which are sensitive to moisture, exhaust gas and dust such as circuit boxes.

  With the demand for downsizing and high performance of electronic devices, there is a demand for thinner components. In order to meet such demands, casings and lids of electronic devices are made thinner, and as a result, the rigidity of each component member is also declining, and the sealing gasket is thin and thin in response to the reduction in rigidity. And there is a demand for softness.

  Since gaskets used in various electronic devices have been thin like rubber bands from the beginning, if they are required to be softer, their handling properties become worse. For example, when attaching a gasket to the lid of the HDD, positioning becomes difficult and workability becomes extremely poor. Several improvements have been proposed for this as described below.

  In Patent Document 1, “a central layer made of a film or sheet of a rigidity-imparting resin layer, and a film of low-rigidity non-foamed rubber or non-foamed elastic plastic that is integrated on one surface of the central layer and has a smaller hardness than this. Alternatively, it is composed of an adhesive layer made of a sheet and an elastic layer made of rubber or elastic plastic foam that is integrated with the other surface of the central layer and has a lower hardness than the adhesive layer, and is punched out in a ring shape to form a packing material. A “to” configuration is disclosed.

  In this patent document 1, since the center layer rich in rigidity is provided, it is easy to maintain the shape of the gasket (packing), and the attachment work to the seal target part which is the attachment object is easy. Moreover, since there is a rubber-like material on both sides of the central layer, the sealing property is also excellent.

  Patent Document 2 states that “in a sealing material for an electrical device having a sealing layer made of a porous material such as foamed synthetic resin or sponge, an adhesive layer laminated on the sealing layer, and a separator laminated on the adhesive layer, Disclosed is a sealing material for electrical equipment, characterized in that the layer comprises a reinforcing layer made of a synthetic resin sheet or film disposed between the adhesive layer and the adhesive layer. ing.

  The sealing material (gasket material) disclosed in Patent Document 2 has a configuration of sealing layer (foam) / adhesive layer / reinforcing film layer / adhesive layer / separator, and a reinforcing film is used as an intermediate layer. Yes. Also in this patent document 2, it is easy to maintain the shape of a sealing material with a rigid intermediate | middle layer, Thereby, the attachment operation | work of the sealing material to the to-be-sealed site | part which is an attachment object is easy.

  Patent Document 3 describes a “manufacturing method of a sealing material in which a resin in a fluid state is supplied from one side of a perforated film and the resin is leaked from the hole to the other side to form a packing on both sides of the film” and Discloses a “sealing material” obtained.

  Also in this patent document 3, since the intermediate layer of the sealing material (gasket) is composed of a rigid film, it is easy to maintain the shape of the sealing material, whereby the sealing material to be sealed to the attachment target is attached. Installation work is easy.

  Patent Document 4 has a configuration in which “a sheet-like material is provided on one surface of a gasket substrate formed of an elastic body, and the gasket substrate side is bonded to a sealed portion with the mounting surface as a mounting surface, and then the sheet-like material is peeled off”. A sheet material is disclosed.

  In Patent Document 4, since the gasket base is supported by a film having a high rigidity until the gasket base is bonded to the sealed portion, the attaching operation to the sealed portion that is an attachment target is facilitated.

  Patent Document 5 discloses “a frame-integrated gasket in which a polypropylene using a metallocene catalyst is fused to a frame and a gasket obtained by injection molding of a thermoplastic elastomer is fused”.

  In Patent Document 5, since the gasket base is integrated with the frame body and the shape is maintained by the frame body, it is easy to perform the mounting operation to the sealed portion that is the mounting target. In addition, according to the manufacturing method disclosed in Patent Document 5, since the injection molding is used, the productivity is good, and the molded product is also taken out from the mold. The shape is stable and easy.

  Patent Document 6 discloses a “frame-integrated gasket in which a polypropylene having a crystallinity of 60 to 80% is used as a frame, and a gasket base obtained by injection molding of a thermoplastic elastomer is fused to the frame”. .

  In this Patent Document 6, like the Patent Document 5, the gasket base is integrated with the frame body, and the shape is maintained by the frame body. It has become. Further, according to the manufacturing method disclosed in Patent Document 6, since the injection molding is used, the productivity is good, and the molded product is also taken out from the mold, so that the molded product is attached. The shape is stable and easy.

Japanese Patent Laid-Open No. 9-189362 Japanese Patent Laid-Open No. 10-173364 Japanese Patent No. 30228804 JP 2003-120816 A JP 2000-240801 A JP 2000-240802 A

  In Patent Document 1, since the attachment property to the sealed portion is improved, further improvement is desired. In particular, it is desired to simultaneously improve the attachment property, reduce the material used, and simplify the manufacturing process.

  Further, in Patent Document 2, since the final product is a punched product, reduction of the material used is a problem, and since the gasket substrate is bonded via a support film serving as an intermediate layer, If there are irregularities on the surface to be bonded, the flatness of the gasket at that portion may deteriorate and the sealing performance may decrease. In this gasket, the support film remains as an intermediate layer, and the film member is not restored once it is bent. Therefore, the sealing performance is inevitably lowered at the bent portion of the film. Therefore, in the manufacturing process, it is necessary to assemble the manufacturing process so that quality control that does not use a bent support film or bending of the support film does not occur, resulting in an increase in manufacturing cost.

  Moreover, in the structure of the said patent document 3, since the resin is leaked from one side of the film to the other side through the hole of the film to form the seal part of the other side, even if the resin to be used has a low viscosity, in the vicinity of the hole Voids are likely to remain, and when voids are generated, the sealing performance of the portions inevitably deteriorates. Further, with this configuration, molding by injection molding using a thermoplastic resin is impossible.

  Moreover, in the said patent document 4, a mold release process is required for a film so that a support film can be peeled from a gasket base material. When a commonly used silicone material is used for the mold release process, when the attachment target is an HDD, the silicone component may adhere to the hard disk surface and hinder the hard disk characteristics. Therefore, in Patent Document 4, a special film that does not require a release treatment using a silicone material, that is, the film itself has a high releasability, is used for the support film. Moreover, in this patent document 4, since the laminated sheet which consists of a support film and a gasket base | substrate is made, it punches into a predetermined shape and uses it, Therefore A punching loss arises. Further, since the gasket cross-sectional shape cannot be a dome shape and can only be a quadrangle, it is impossible to reduce the hardness of the gasket by adjusting the cross-sectional shape to reduce the compression area. Therefore, lowering the hardness of the gasket must be dealt with by lowering the hardness of the material itself, and the degree of difficulty in reducing the hardness is high. As described above, in the gasket material disclosed in Patent Document 4, the improvement in the attachment property to the sealed portion is realized, but the material used and the manufacturing process are simplified while maintaining such performance. It has been pointed out as a problem to achieve.

  Moreover, in the said patent document 5, since the elastomer is attached only to one side, the sealing performance in the film surface without an elastomer will fall significantly. If a rigid film loses its flatness due to bending at one end, it is impossible to restore the flatness. Therefore, the sealing performance in the non-flat part is greatly reduced. In order to satisfy the sealing property, the structure disclosed in Patent Document 2 or the like in which the film surface does not directly contact the portion to be sealed, that is, a special structure in which gaskets are attached to both surfaces of the film must be used. Even in such a structure, as described above, the sealing performance at the bent portion of the support film may be lowered.

  Moreover, in the said patent document 6, the sealing performance falls similarly to the said patent document 5. FIG. It is difficult to avoid deterioration of the sealing performance due to the bending of the film. In order to satisfy the sealing property, a special structure is required in which the film surface does not directly contact the portion to be sealed. Even in such a case, it is difficult to completely prevent the deterioration of the sealing property.

This invention is made | formed in view of the said situation, The subject is providing the gasket material which has the following characteristics, the manufacturing method of a gasket material, and the attachment method of a gasket. That is,
(1) To provide a gasket material that can be produced by injection molding with good productivity and good take-out from a mold.
(2) To provide a gasket material that is less likely to be deformed when attached to a portion to be sealed and has good attachment workability.
(3) Provided is a gasket material having a good sealing property in which a support film does not directly contact a portion to be sealed, and there is no fear of deterioration of the sealing property due to poor bending of the film.
(4) Provide a film-integrated gasket material that uses a very general-purpose and inexpensive film as a support film without using a special film, thereby realizing a reduction in manufacturing costs.
(5) Provided is a gasket material having a good take-out property after injection molding even when the gasket substrate is composed of a soft foam.
(6) A simple and rational attachment method is provided as a method for attaching the gasket to the sealed portion.

  In order to solve the above problems, a gasket material according to the present invention is characterized by comprising a resin film and an elastic gasket that is easily fixed to one surface of the resin film.

The gasket is preferably integrally formed on one side of the resin film by insert molding by thermoplastic elastomer injection molding.
Here, “insert molding” means a molding method in which a resin is molded and fixed on one side of a film prepared in advance.

  The manufacturing method of the gasket material according to the present invention is such that an elastic gasket made of a thermoplastic elastomer is fixed to one surface of a resin film not subjected to surface release treatment by injection molding under the condition that the resin film is not fused to the gasket. It is characterized by obtaining a gasket material.

  The condition not to be fused can be realized, for example, by setting the surface temperature of the resin film to be lower than the melting point of the resin film. In other words, by suppressing the temperature rise of the resin film when the gasket is molded into a resin film with a mold that comes into contact with the film, the gasket and the resin film are not fused together, but a very small portion is lightly fused. Can be suppressed. As a result, the elastic gasket can be peeled from the resin film by an extremely slight pulling force. However, although peeling becomes easy, until the gasket is positioned and fixed to the sealed portion, it does not peel unless a special peeling force is applied.

  There is also a method in which a continuous resin film supplied from a roll-shaped resin film is used as the resin film instead of a single film, and the gasket is continuously fixed to the supplied continuous resin film by injection molding. Is possible. In this case, after the gasket is fixed to the continuous film, the continuous resin film in which the gasket is integrated may be cut into a predetermined size without being wound into a roll to obtain a single wafer product.

  In the gasket mounting method according to the present invention, the elastic gasket is easily fixed to one surface of the resin film, the exposed surface of the elastic gasket integrated with the resin film is fixed to the sealed portion, and fixed to the sealed portion. The resin film is peeled off from the formed elastic gasket.

  It is important to fix the elastic gasket to the sealed portion so as to obtain a stronger fixing force than the fixing force of the gasket to the resin film.

  In addition, another configuration of the gasket mounting method according to the present invention is that the elastic gasket is easily fixed to one side of the resin film, and the elastic gasket integrated with the resin film is fixed by a fixing jig while maintaining its shape. Holding, then peeling off the resin film, fixing the exposed peeled surface to a sealed portion, and removing the fixing jig from the elastic gasket fixed to the sealed portion.

  In this case, the elastic gasket holding force of the fixing jig is set to be stronger than the fixing force of the gasket to the resin film, and the elastic gasket is fixed to the sealed portion by the gasket of the fixing jig. It is important to set so as to obtain a fixing force stronger than the holding force.

  The elastic gasket may be fixed to the sealed portion using an adhesive or by heat fusion.

  Hereinafter, the configuration of the present invention will be described in more detail.

(Injection molding of elastic gaskets)
As shown in FIG. 1, a thermoplastic resin film 3 having a predetermined shape obtained in advance is placed in a mold composed of a fixed mold 1 and a movable mold 2. Next, a gasket 4 is formed on the film 3 by insert molding a thermoplastic elastomer as a gasket raw material with an injection molding machine 100. After molding, the film-integrated gasket is removed from the molds 1 and 2.

  By setting the mold in contact with the film at a relatively low temperature so that the film is not melted by the molten resin, the gasket and the film are weakly bonded and easily peeled. When polypropylene is used as the film, the mold temperature is preferably about 10 ° C to 60 ° C, and the thermoplastic elastomer preferably has a cylinder temperature of 180 ° C to 230 ° C.

  For the film placed in the mold, two or four gaskets can be taken.

  When molding a gasket by injection molding, it is preferable to devise air venting such as a gas vent so that a weld line is less likely to occur.

  In order to form a foam (elastic gasket) by injection molding, it is necessary to select a composition and a foaming agent suitable for foaming depending on the thickness of the product. Generally, when the thickness is as thin as about 1 mm, it is better to use a nitrogen-based foaming agent, and when it is thicker, a carbon dioxide-based foaming agent can be applied. Moreover, a foam with a thick skin can be produced by slowing the injection speed during injection molding or lowering the mold temperature. The thicker the skin layer, the higher the sealing performance of the gasket itself. A method of reducing the mold clamping pressure after injecting the resin into the mold, or increasing the clearance of the mold cavity after or during the injection is preferable as a method of promoting foaming.

  Further, as shown in FIG. 2, the injection molding to the film is performed by using the continuous injection molding apparatus 101 capable of continuously performing the injection molding on the roll-wrapped film 30 and placing the gasket 4 on the continuous film 6. It is also possible to form it continuously. According to this continuous molding method, a large amount of gasket material can be produced. Furthermore, the gasket material can be accommodated in a roll 31 as shown in FIG. And while rewinding this roll winding 31, it can position continuously to seal | sticker parts, such as a lid | cover of HDD, and the gasket 4 can be attached.

  In addition, you may cut | disconnect to the predetermined dimension match | combined with the following attachment process, without winding up a continuous film, after carrying out injection molding continuously to the said roll wound film. In that case, wrinkles of the product can be prevented.

  In addition, the roll-wrapped resin film is cut into a predetermined size in advance, and each cut film is supplied to a molding machine one after another, and a gasket is formed on each film one after another by insert molding. It is also possible to produce an integral resin film continuously.

  According to the gasket material continuous manufacturing method using the roll-shaped resin film or the single wafer film, the gasket material can be manufactured with extremely high productivity.

(Type of resin film)
The film to be used is made of a thermoplastic resin and is selected depending on the compatibility with the gasket raw material to be used. The melting point of the film is preferably 150 ° C. or higher in view of preventing deformation and fusion during injection molding.

  The adhesive force between the resin film that supports the elastic gasket and the gasket (in other words, ease of peeling) needs to be lower than the adhesive force between the sealed portion and the gasket. This adhesion force is required to such an extent that the gasket does not peel from the support film when the gasket material is removed from the mold or during the operation of positioning the gasket material to the sealed portion. The control of the adhesive force (easiness of peeling) can be adjusted by appropriately selecting the type of film, the compatibility of the thermoplastic elastomer, and the injection conditions.

  For example, when the gasket raw material is an olefin elastomer or a styrene elastomer containing an olefin component, an olefin film may be selected as the support film. When a polypropylene-based or polymethylpentene-based resin is selected as the gasket raw material, particularly as a resin having a melting point of 150 ° C. or higher, the conditions for injection molding can be set in a wide range, thereby controlling an appropriate adhesive force.

  The thickness of the support film is preferably thick in terms of rigidity, but may be selected including the cost. About 100 to 400 μm is most preferable.

  In order to control the peelability of the film, a film having two or more layers may be used, and the film surface may be subjected to a treatment for adjusting the peel force such as coating, but these are not essential. Moreover, when it is desired to control the peelability of the resin film from the gasket in a direction in which it is difficult to peel off, the surface of the resin film may be surface-treated by corona discharge treatment, ultraviolet irradiation treatment, or the like.

  When the used film is smooth, it can be used again as it is. When the smoothness is lowered, the smoothness can be recovered by thermal treatment, and may be reused thereafter.

(Thermoplastic elastomer)
Examples of thermoplastic elastomers include olefin elastomers, styrene elastomers (containing olefin components), urethane elastomers, ester elastomers, polyamide elastomers, and fluororubber elastomers. Of these, olefin-based elastomers and styrene-based elastomers are preferred because they have properties such as low moisture permeability, acid resistance, alkali resistance, and low liquid permeability.

  The olefinic thermoplastic elastomer is a resin composed mainly of olefinic hydrocarbons in the molecule, and is obtained by a kneading reaction between an olefinic copolymer rubber and a crystalline olefinic plastic, or by a synthesis reaction of an olefinic monomer. What can be obtained can be illustrated.

  As the olefin copolymer rubber, a copolymer of ethylene and α-olefin (for example, propylene) or a copolymer of a non-conjugated diene component is preferably used.

  As the crystalline olefin plastic, a polymer or / and copolymer of α-olefin such as propylene is used. The kneading reaction in this case can also be performed in the presence of a crosslinking agent or a crosslinking aid.

  The olefin-based thermoplastic elastomer is suitable as a gasket material because of its low moisture permeability and resilience and good moldability in injection molding.

  The styrene thermoplastic elastomer is a resin obtained by kneading and reacting a hydrogenated styrene-butadiene copolymer or styrene-isoprene copolymer with an olefin resin. Examples of the styrene-butadiene or styrene-isoprene copolymer include those commercially available as so-called SBS or SIS block copolymers. In addition, the olefinic thermoplastic elastomer has good resilience at high temperatures, and the styrene thermoplastic elastomer has good resilience near room temperature, so these may be used in combination.

  When the elastomer material to be used is a material that generates a large amount of gas, a step of heat treatment at a high temperature called baking may be provided to disperse the gas generated. This baking process can be performed at the raw material stage or after the gasket is formed. In this case, a vacuum state may be used in combination.

  A foam can be manufactured by mix | blending with a thermoplastic elastomer the thermal decomposition-type foaming agent which generate | occur | produces gas by foaming thermal decomposition. Specific examples of such a foaming agent include azodicarbonamide (ADCA), diethylazocarboxylate, barium azodicarboxylate, 4,4-oxybis (benzenesulfonylhydrazide), and 3,3-disulfonehydraside phenylsulfone. Examples thereof include organic foaming agents such as acid, N, N′-dinitrosopentatetramine, p-toluenesulfonyl hydrazide, and trihydrazinotriazine, and inorganic foaming agents such as sodium bicarbonate, ammonium bicarbonate, and ammonium carbonate. In particular, azodicarbonamide (ADCA), N, N'-dinitrosopentatetramine, and trihydrazinotriazine are preferable as the organic foaming agent, and sodium hydrogen carbonate is preferable as the inorganic foaming agent. Further, sodium hydrogen carbonate, monosodium citrate and glycerin fatty acid ester may be mixed and used. These foaming agents can be used singly or in combination, or in combination with a so-called decomposition aid.

  In the present invention, instead of foaming with a pyrolytic foaming agent, the resin can be foamed with butanes, pentanes, water or the like as a volatile solvent. Further, the gas itself can be dispersed or impregnated in the foamed resin base material, and in this case, carbon dioxide gas or nitrogen gas can be used as the foaming agent.

  Carbon dioxide gas generated by the reaction between sodium hydrogen carbonate and an acid, or carbon dioxide gas generated by an isocyanate compound and water can also be used. There is also a method in which moisture at a high temperature of a hydrate salt such as calcium sulfate or aluminum hydroxide is used as a foaming agent.

  A foaming agent that uses carbon dioxide gas or releases carbon dioxide through reaction or decomposition tends to form a thick skin, and a nitrogen-based foaming agent tends to form a skin that is difficult to form. These foaming agents can be used properly according to the product thickness, the desired foaming ratio, and composition.

(Attaching the elastic gasket to the sealed part)
In order to attach the gasket of the obtained film-integrated gasket material to the site to be sealed, an adhesive is applied to the other surface of the film, and then the film is peeled off. Further, the gasket is temporarily held by a fixing jig while maintaining the shape, the support film is peeled off, an adhesive is applied to the peeled surface, the gasket is fixed to the sealed portion, and then the fixing jig is removed. A gasket mounting method using this fixing jig is also possible. In any of these, it is not necessary to apply the adhesive to the entire exposed surface of the gasket, and it is preferable that the amount of adhesive is as small as possible as long as the gasket can be securely fixed to the surface to be sealed. The type of adhesive is preferably a hot melt system or a reactive hot melt system because it does not contain a solvent.

  Instead of the adhesive, it is preferable to apply the heat fusion method to the sealed portion by utilizing the fact that the gasket material is a thermoplastic elastomer. In the fusing method, the sealed portion may be heated or the gasket surface may be heated. According to this method, it is easy to eliminate the use of an adhesive, and it is possible to provide a clean gasket that does not cause gas generation.

According to the present invention configured as described above, the following effects can be obtained.
(I) A film-integrated gasket material can be produced by injection molding, the mold release from the mold is good, and the productivity is extremely good.
(Ii) Since it is a film-integrated gasket material, the gasket is not deformed at the time of construction and has good workability, and the installation cost can be kept low.
(Iii) Position the resin film-integrated gasket as it is at the site to be sealed and fix it to the site to be sealed, then peel off and remove the resin film, or hold the gasket with a fixing jig, and support film In the state where the gasket is peeled, the exposed surface of the gasket is positioned at the sealed portion, fixed to the sealed portion, and then the fixing jig is removed. Therefore, only the elastic gasket is attached to the sealed portion, and the opposite of the sealed portion. The elastic gasket is in direct contact with any surface. Therefore, the sealing performance of the portion sealed by the gasket according to the present invention is very good.
(Iv) The film used as the resin film for supporting the gasket is economical and can be reused because an inexpensive olefin-based film can be applied. Furthermore, no harmful gases are generated even if it is incinerated after disposal when it is no longer suitable for reuse.
(V) Since a soft foam gasket is formed integrally with a film, productivity and take-out property are also good.
(Vi) Because it is a gasket using a thermoplastic elastomer, it can be installed by thermal fusion, does not require the use of adhesives, has high productivity, and can be cleaned without worrying about gas generation such as organic solvents. It becomes.

  Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, the Example shown below is only the illustration which illustrates this invention suitably, and does not limit this invention at all.

Example 1
(Production process of film-integrated gasket material)
FIG. 4 is a cross-sectional configuration diagram of a mold for molding the gasket material of the present invention. In the figure, reference numeral 1 is a fixed mold, 2 is a movable mold, 5 and 6 are cavities, the cavity 5 is a resin film insertion part, and the cavity 6 is a gasket injection part.

  A PP film (110 mm (length) × 80 mm (width) × 200 μm (thickness)) is inserted into the cavity 5, the fixed mold 1 and the movable mold 2 are clamped, and the cavity 6 is used for gasket molding. As a material, an olefin-based thermoplastic elastomer (MFR: ASTM 1238, 190 ° C., 2.16 kg load) 10 g / 10 minutes) was injected at a cylinder set temperature of 200 ° C. to form a gasket (injection conditions were Injection speed: 200 mm / s, mold temperature: 30 ° C.).

  When the molded product is taken out from the mold, it is easy to remove the mold, and the gasket molded product (gasket material) integrated with the film in a state where the molded gasket is weakly adhered to the PP film (easy to peel). I was able to make it. The molded state of the gasket on the obtained film was good. Moreover, when the gasket was peeled from the support film by hand, it was found that the gasket could be easily peeled off.

(Example 2)
(Manufacturing process of gasket material when the gasket is foam)
As the molding die, the die shown in FIG. A PP film (110 mm (length) × 80 mm (width) × 200 μm (thickness)) is inserted into the cavity 5 of this mold, the fixed mold 1 and the movable mold 2 are clamped, and the cavity 6 is As a gasket molding material, a master batch was prepared by kneading 4 parts by weight of an inorganic foaming agent into an olefinic thermoplastic elastomer (MFR: ASTM 1238, 190 ° C., 2.16 kg load) 10 g / 10 min). Were injected and foamed at a cylinder set temperature of 200 ° C. to form a foamed gasket (injection conditions were injection speed: 200 mm / s, mold temperature: 30 ° C.).

  When the molded product is taken out from the mold, it is easy to remove the mold, and the molded gasket (foamed gasket material) is integrated with the film while the molded gasket is weakly adhered to the PP film (easy to peel) (Foaming ratio: 1.5 times)). The molded state of the foamed gasket on the obtained film was good. Further, it was found that when the foam gasket was manually peeled from the support film, it was easily peeled off.

Example 3
(Mounting the gasket with film-integrated gasket material (1))
The attachment target is a lid of the HDD, and the gasket material to be used is the film-integrated gasket material prepared in the first and second embodiments.

The attachment method will be described with reference to FIGS. In these drawings, reference numeral 3 is a support film, 4 is a gasket, 7 is an adhesive, and 8 is a lid of the HDD.
As shown in FIG. 5, an olefin-based adhesive 7 is applied to the exposed surface of the gasket 4 fixed to the support film 3 of each gasket material. Next, as shown in FIG. 6, the surface to which the adhesive 7 has been applied is adhered and fixed to the inner surface of the HDD lid 8, and the support film 3 is peeled off, and as shown in FIG. The gasket 4 was attached.

  Regardless of which gasket material of Examples 1 and 2 was used, the gasket 4 could be mounted stably. The sealing performance of this gasket 4 was very good.

Example 4
(Mounting of gasket with film-integrated gasket material (2))
The mounting target is the same HDD lid as in the third embodiment, and the gasket material used is the film-integrated gasket material prepared in the first and second embodiments.

An attachment method will be described with reference to FIGS. In these drawings, reference numeral 3 is a support film, 4 is a gasket, 7 is an adhesive, 8 is an HDD lid, and 10 is a gasket fixing jig.
First, as shown in FIG. 8, the gasket 4 of the film-integrated gasket material prepared in Example 1 and Example 2 was set on a gasket fixing jig 10. Next, the support film 3 was peeled off, and as shown in FIG. 9, an olefin-based adhesive 7 was applied to the peeled gasket surface. As shown in FIG. 10, the surface to which the adhesive 7 was applied was pressed against the inner surface of the lid 8 of the HDD to be bonded and fixed. Thereafter, as shown in FIG. 11, when the jig 10 was removed, the gasket 4 was attached to the lid 8 of the HDD.

  Regardless of which gasket material of Examples 1 and 2 was used, the gasket 4 could be mounted stably. The sealing performance of this gasket 4 was very good.

(Example 5)
(Mounting the gasket by heat sealing)
The mounting target is the same HDD lid as in Examples 3 and 4, and the gasket material used is the film-integrated gasket material created in Examples 1 and 2.

The attachment method will be described with reference to FIGS. In these drawings, reference numeral 3 is a support film, 4 is a gasket, 7 is an adhesive, 8 is a lid of the HDD, and 8a is a heating portion when the sealing portion of the lid 8 is heated.
First, as shown in FIG. 12, the gasket 4 of the film-integrated gasket material prepared in Example 1 and Example 2 was set on the gasket fixing jig 10, and the support film (3) was peeled and removed. On the other hand, the sealing portion of the HDD lid 8 is heated with an electric heater, and then the gasket 4 fixed to the fixing jig 10 is brought into contact with the heating portion (sealing portion) 8a of the HDD lid 8 as shown in FIG. The gasket 4 was fixed to the lid 8 by heat fusion. When this lid 8 was attached to an HDD main body (not shown) and the sealing property of the HDD device was confirmed, it was good.

  As described above, the gasket material according to the present invention includes a resin film and an elastic gasket that is easily fixed to one surface of the resin film. The gasket material manufacturing method according to the present invention is such that an elastic gasket made of a thermoplastic elastomer is injection-molded on one side of a resin film that has not been surface-released, so that the resin film is not fused to the gasket. And obtaining a gasket material. Further, in the gasket mounting method according to the present invention, the elastic gasket is easily peeled and fixed to one surface of the resin film, and the exposed surface of the elastic gasket integrated with the resin film is fixed to the sealed portion. The resin film is peeled off from the elastic gasket fixed to the surface, or the gasket integrated with the resin film is held by a fixing jig, and the exposed surface of the gasket is used as a sealed portion in a state where the support film is peeled off. After the positioning and fixing to the sealed portion, the fixing jig is removed.

Therefore, according to this invention, the following effects can be acquired in manufacture and use of a gasket material.
(I) A film-integrated gasket material can be produced by injection molding, the mold release from the mold is good, and the productivity is extremely good.
(Ii) Since it is a film-integrated gasket material, the gasket is not deformed at the time of construction and has good workability, and the installation cost can be kept low.
(Iii) Position the resin film-integrated gasket as it is at the site to be sealed and fix it to the site to be sealed, then peel off and remove the resin film, or hold the gasket with a fixing jig, and support film In the state where the gasket is peeled, the exposed surface of the gasket is positioned at the sealed portion, fixed to the sealed portion, and then the fixing jig is removed. Therefore, only the elastic gasket is attached to the sealed portion, and the opposite of the sealed portion. The elastic gasket is in direct contact with any surface. Therefore, the sealing performance of the portion sealed by the gasket according to the present invention is very good.
(Iv) The film used as the resin film for supporting the gasket is economical and can be reused because an inexpensive olefin-based film can be applied. Furthermore, no harmful gases are generated even if it is incinerated after disposal when it is no longer suitable for reuse.
(V) Since a soft foam gasket is formed integrally with a film, productivity and take-out property are also good.
(Vi) Because it is a gasket using a thermoplastic elastomer, it can be installed by thermal fusion, does not require the use of adhesives, has high productivity, and can be cleaned without worrying about gas generation such as organic solvents. It becomes.

It is a conceptual diagram explaining the injection molding method of the gasket material of this invention. It is a conceptual diagram explaining the continuous manufacturing method of the gasket material of this invention. It is a perspective view of the continuous gasket material obtained by the continuous manufacturing method of a gasket material in this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional configuration diagram of an example of a mold for molding a gasket material, illustrating Example 1 of the present invention. Example 3 of the present invention will be described and is a schematic cross-sectional view of a gasket material to be used. FIG. 9 is a schematic cross-sectional view illustrating a third embodiment of the present invention in a state where a gasket material is attached to the lid of the HDD. FIG. 9 is a schematic cross-sectional view illustrating a third embodiment of the present invention in a state where a gasket material is completely attached to the lid of the HDD. Example 4 of the present invention will be described and is a schematic cross-sectional view of a state in which a gasket material is temporarily fixed to a gasket fixing jig. FIG. 9 is a schematic cross-sectional view illustrating a fourth embodiment of the present invention, in which a gasket material is temporarily fixed to a gasket fixing jig and then an adhesive layer is formed on the gasket surface. FIG. 7 is a schematic cross-sectional view illustrating a fourth embodiment of the present invention in a state where an adhesive layer on a gasket surface is bonded to a lid of an HDD while being fixed to a gasket fixing jig. FIG. 10 is a schematic cross-sectional view illustrating a fourth embodiment of the present invention in a state where the gasket fixing jig is removed and the gasket is completely attached to the lid of the HDD. FIG. 9 is a schematic cross-sectional view illustrating a fifth embodiment of the present invention in a state where a gasket material is temporarily fixed to a gasket fixing jig. Example 5 of the present invention will be described. After fixing the gasket surface to the heating part (seal part) of the lid of the HDD while being fixed to the gasket fixing jig, the gasket fixing jig is removed, It is typical sectional drawing of the state which completed the attachment of the gasket to the lid | cover of HDD.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed side metal mold 2 Movable side metal mold 3 Supporting resin film 4 Gasket 5, 6 Cavity 7 Adhesive 8 HDD lid 8a Sealing part (heating part)
DESCRIPTION OF SYMBOLS 10 Gasket fixing jig 30 Roll winding of resin film 31 Roll winding of gasket material 100 Injection molding machine 101 Continuous injection molding apparatus

Claims (12)

  A gasket material comprising a resin film and an elastic gasket that is easily fixed to one side of the resin film.   The gasket material according to claim 1, wherein the elastic gasket is integrally formed on one side of the resin film by insert molding by injection molding of a thermoplastic elastomer.   A gasket material is obtained by fixing an elastic gasket made of a thermoplastic elastomer on one surface of a resin film not subjected to surface release treatment by injection molding under the condition that the resin film is not fused to the gasket. Method for manufacturing gasket material   The method for producing a gasket material according to claim 3, wherein the condition for not fusing is realized by setting the surface temperature of the resin film to be lower than the melting point of the resin film.   The continuous resin film supplied from a roll-shaped resin film is used as the resin film, and the gasket is continuously fixed to the supplied continuous resin film by injection molding. The manufacturing method of the gasket material as described in 2.   6. The method for manufacturing a gasket material according to claim 5, wherein after the gasket is fixed to the continuous film, the continuous resin film in which the gasket is integrated is cut into a predetermined dimension.   The elastic gasket is easily peeled and fixed to one side of the resin film, the exposed surface of the elastic gasket integrated with the resin film is fixed to the sealed portion, and the resin film is peeled from the elastic gasket fixed to the sealed portion. A method for attaching a gasket, characterized by:   The method of attaching a gasket according to claim 7, wherein the elastic gasket is fixed to a sealed portion so as to obtain an adhesion force stronger than an adhesion force of the gasket to the resin film.   The elastic gasket is easily peeled and fixed to one side of the resin film, and the elastic gasket integrated with the resin film is held by a fixing jig while maintaining its shape, and then the resin film is peeled off and the exposed peeling is performed. A gasket mounting method comprising fixing a surface to a sealed portion and removing the fixing jig from an elastic gasket fixed to the sealed portion.   The elastic gasket holding force of the fixing jig is set to be stronger than the fixing force of the gasket to the resin film, and the elastic gasket is fixed to the sealed portion more than the gasket holding force of the fixing jig. The gasket mounting method according to claim 9, wherein the gasket is set so as to obtain a strong fixing force.   The method for attaching a gasket according to any one of claims 7 to 10, wherein the elastic gasket is fixed to a sealed portion using an adhesive.   The method for attaching a gasket according to any one of claims 7 to 10, wherein the elastic gasket is fixed to a sealed portion by heat fusion.

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