JP2003136603A - Fixing structure for plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for fixing a flexible sheet-like first member to a second member having an FRP layer via sewing threads in the case of fixing a plastic member in which an interface is hard to be adhered. SOLUTION: The fixing structure for a plastic comprises a first member 1 made of the sheet or a place constituted of the plastic and a fiber layer and having flexibility, sewing threads 4 sewn through the front and rear surfaces of the first member 1, and a second member 2 having the FRP layer obtained by impregnating a fiber-reinforced layer 20 with a blending resin 10 and curing the resin in such a manner that the first member 1 is fixed to the FRP layer of the second member 2 with the blending resin 10 via the threads 4 sewn to the member 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a plastic member whose interface is difficult to adhere.

[0002]

2. Description of the Related Art Conventionally, when different plastic members are fixed to each other with an adhesive, the peel strength between adherends depends on the adhesive strength of the adhesive. However, this adhesive strength does not provide the required strength. However, peeling may occur between the plastic members.
In addition, problems of adhesion will occur due to aging and deterioration due to environmental conditions used. For this reason, metal materials (bolts, nuts, rivets) are used for plastics whose interfaces are difficult to bond.
Connections are made by convention.

[0003]

SUMMARY OF THE INVENTION The present invention was conceived in view of the above circumstances, and its main problem is a plastic sheet-like first member and a flexible sheet-like first member and an FRP. When fixing the second member having the layer, the front and back sides are sewn and sewn to the flexible first member with a sewing thread, and the first member and the second member are fixed and peeled by using the sewing thread. To secure strength. Further, the cloth is sewn to the softer first member with the sewing thread, and the cloth and the sewing thread intervene to fix the first member and the second member to each other to secure the peel strength.

[0004]

In order to solve the above problems, according to the invention of claim 1, there is provided a first member comprising a flexible sheet or plate composed of a plastic and a fiber layer, and the first member. FRP that is obtained by impregnating and hardening the fiber reinforced layer with the sewing thread sewn through the front and back of the
And a second member having a layer, wherein the first member is fixed to the FRP layer of the second member with a compounded resin via a sewing thread sewn to the first member. I am taking it. According to the second aspect of the present invention, the first member composed of a single flexible sheet or plate made of plastic or rubber, the sewing thread penetrating and sewn through the front and back of the first member, and the mixed resin are A second member having a FRP layer formed by impregnating and curing the fiber-reinforced layer,
The technical means is employed in which the member is fixed to the FRP layer of the second member with a compounded resin via a sewing thread sewn to the first member. According to a third aspect of the present invention, a cloth or mesh formed by overlapping the first member with a sewing thread is provided, and the first member is sewn to the first member via the cloth and the mesh and the thread. FR of the second member with compounded resin
We take the technical means of fixing it to the P layer.
According to a fourth aspect of the present invention, a plastic cloth or mesh formed by overlapping and fusing on the first member is provided, and the first member is mixed with the resin or resin via the cloth or mesh fused on the first member. Then, the technical means of being fixed to the FRP layer of the second member is taken. According to a fifth aspect of the present invention, a plastic cloth or mesh is laminated on the first member and the cloth is sewn to the first member with a suture to fix the cloth to the first member. 1 member,
A technical measure is taken in that the resin is fixed to the FRP layer of the second member through the cloth or mesh fixed to the first member and the mixed resin. In the invention of claim 6, a technical means is adopted in which the first member or the cloth or mesh is folded back and overlapped with each other by stitching or fusing with a sewing thread. In the invention of claim 7, the blocking member is attached to the first member in a state of being in contact with the first member, and the blocking member incorporated by fixing the first member and the second member has a liquid or gas blocking property. , Is taken as a technical means.

Here, the fiber layer means fibers used in the composite material (for example, hemp, cotton, silk, wool, polyamide, polyester, polyacrylonitrile, polyvinyl alcohol,
It refers to a layered material (whether natural, synthetic or inorganic material such as polypropylene, polyaramid, glass fiber, asbestos, carbon fiber, etc.) formed (for example, mat, cloth, fiber suture cloth, knitted cloth, non-woven cloth, felt, etc.). What is compounded resin?
For the main resin necessary for the RP layer (for example, unsaturated polyester, vinyl ester, epoxy, phenol, etc.),
A curing agent (a compound that is compatible with the main material resin and hardens the resin), a filler (inorganic or organic, depending on the purpose), a coloring material, and all or part of the materials necessary for molding are mixed. A fluid resin. The fiber-reinforced layer is a layered material (for example, mat, cloth, preform product, fiber) formed of a fiber-reinforced material used in the FRP layer (for example, glass, carbon, polyaramid, polyvinyl alcohol, polyamide, polyester, etc.). Suture cloth, knitted fabric, non-woven fabric,
Felt, etc.). The plastic cloth is a cloth that can be fixed to the first member, which is one of the adherends, by using a heat source (heating plate, hot air, frictional heat, far infrared heating, high-frequency dielectric heating, or the like). , Woven, knitted,
Includes non-woven fabrics. Further, felt may be used as the cloth. Further, the plastic mesh may be one that can be fixed to the first member by using a heat source, like the plastic cloth.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the plastic fixing structure of the present invention will be described below with reference to the drawings. In the plastic fixing structure shown in FIG. 1, the first member 1 which is one adherend is made of a plastic composite sheet or plate and the second member 2 which is the other adherent is It consists of FRP.

The composite sheet used here is a canvas or tarpaulin used for tents, container bags, and various sheets (materials for the surface layer are polyethylene, polyester, polyfluoropyrene, polyvinyl alcohol, polyamide, ethylene vinyl acetate copolymer, polychlorination). Vinyl, chlorobrene rubber, rubber such as butyl rubber, etc.) is used, and the fiber layer is covered with a plastic surface layer, and the material can be appropriately selected and used according to the purpose.

Then, a joining corresponding portion 3 for fixing the first member 1 and the second member 2 is provided in the first member 1, and the sewing thread 4 is penetrated in the area of the joining corresponding portion 3 to the front and back, and the seam 5 is formed. Appears on the surface of the member 1. It is also possible to fasten and sew the fiber layer inside the first member 1 with the sewing thread 4.
The number of stitches 5 (for example, 1 to 3), the stitch interval (for example, 1 to 15 mm), and the type of stitches (for example, straight stitch, lock stitch, double chain stitch, octagonal stitch) depend on the peel strength between members. The fixing force between the first member 1 and the second member 2 can be adjusted by appropriately adjusting the fitting arrangement. The sewing thread 4 used here is the first member 1
When the first thread 1 has a strength to break the material when the suture thread 4 is pulled through the front and back of the natural thread (for example, hemp,
Cotton, silk, wool, etc.), synthetic (eg polyamide, polyester, polyacrylonitrile, polyvinyl alcohol,
Any of inorganic (for example, glass, asbestos, carbon) materials such as polypropylene and polyaramid may be used, and the thickness (preferably 0.3 to 2 mm) may be used without particular limitation.

In the case of the present embodiment, on the surface of the joining corresponding portion 3 formed on the end side of the first member 1 made of the composite material sheet,
The second member 2 made of the FRP layer is formed into a desired shape. For example, in order to form the second member 2 into a desired shape, molds and jigs are aligned so that the joining corresponding portion 3 corresponds to the desired shape, and the fiber reinforced layer 20 is disposed in a portion matching the shape, Resin 10
Then, the desired shape of the second member 2 is adjusted by impregnation, shaping and curing.
In addition, the desired shape of the second member 2 is divided into respective shapes in advance and molded, and when the divided members are formed into the desired shape of the second member 2, the joining of the first member 1 with the compounded resin is performed. The second member 2 may be fixed to the portion 3 and trimmed into a desired shape.

At the time of this formation, the sewing thread 4 of the joining corresponding portion 3 and the needle hole through which the sewing thread passes are also filled with the compounded resin 10, so that the sewing thread 4 is fixed. Here, the resin mixture of the second member 2 made of the FRP layer intervenes in the gap between the sewing thread 4 and the needle hole portion of the sewing thread 4 (the hole formed for sewing), thereby increasing the strength of the sewing thread 4 and The fixing force between the sewing thread 4 and the first member 1 can be increased. Further, when a surface where the second member 2 is not joined appears in the joining corresponding portion 3, it is preferable to interpose a compounded resin or the like also in the seam 5 so that the sewing thread 4 is not loosened. From this, even if the interface is difficult to adhere to the plastic, the thread is sewn onto the first member 1 and the compounded resin is cured, so that stress is applied to the joint between the first member 1 and the second member 2. Even if stress is applied, since the stress is shared by the seam 5, the sewing thread 4 and the needle hole portion, it is possible to maintain the fixed state between the flexible member and the member having the FRP layer.

The occupancy of the sewing thread 4 with respect to the diameter of the needle hole due to the thickness of the sewing needle and the thread 4 and the elasticity of the composite material sheet, and the wettability between the sewing thread 4 and the fiber layer (not shown) of the composite material sheet and the compound resin 10. In this regard, the sewing needle, the size of the needle hole, the sewing thread 4, and the first member 1 of the composite material sheet so that the compound resin can be impregnated and cured into the fiber layer inside the first member 1 through the needle hole of the sewing thread 4. The first member 1 and the second member 2 can be prepared by appropriately adjusting the fiber layer, elasticity, and the resin mixture of the second member 2 of the FRP layer.
Is more firmly fixed.

As shown in FIG. 2, the second member 2 includes a connecting portion 2A and a first member between the first members 1 in the structure.
It may be used as the reinforcing frame body 2B fixed at a midway position of the member 1, and the shape thereof is not particularly limited. In this case, the first member 1 has the joint corresponding portion 3 formed at the end portion or the middle position thereof, and the portion corresponding to the second member 2 becomes the joint surface 6. Although the joint surface 6 is a flat surface in the illustrated example, it may be a surface having irregularities or curves.

In each of the above-described embodiments, the example in which the second member 2 of the FRP layer is fixed to one surface of the first member 1 of the composite material sheet is shown. However, as shown in FIG. The front and rear surfaces of the portion 3 may be fixed while being sandwiched by the second member 2. In this case, the seams 5 on the front and back of the first member 1 are filled with the compound resin, so that the pair of second members 2 are fixed at the joint surfaces 6 on both the front and back sides, and the compound resin covers the entire sewing thread 4. Since the sewing thread 4 is reinforced and the member 2 fixes both the front and back surfaces through the needle hole portion of the sewing thread, the flexibility of the joining corresponding portion 3 in the first member 1 of the composite sheet is restricted, so that the first member 1 and The fixation with the second member 2 can be ensured.

In the embodiment having a different fixing structure shown in FIG.
A cloth 7 having substantially the same shape as that of the joining corresponding portion 3 is laid on the joining corresponding portion 3 of the first member 1 of the composite material sheet, and the cloth 7 is sewn to the first member 1 with a suture thread 4 and fixed thereto. The fixation of the cloth 7 to the first member 1 is sewn with the suture thread 4 as described above, and is firmly performed so as not to separate. The other structure is the same as that of the above embodiment. In this embodiment, the fabric 7 of the first member 1, the seam 5 and the sewing thread 4 are covered with the second member 2, and the first member 1 and the second member 2 are fixed to each other via the joint surface 6. In this case, the fixed area of the first member 1 and the second member 2 is
Since the wide surface of the cloth 7 is fixed to the joint surface 6 of the second member 2, the cloth 7 can be widened as compared with the case where only the sewing thread 4 is used. Although the size and the arrangement of the cloth 7 are similar to those of the joining corresponding portion 3 in the above-mentioned embodiment, only a part thereof may be set, and it may be set corresponding to the portion where the peel strength is desired to be strengthened. The fabric 7 used here is made of natural (eg, hemp, cotton, silk, wool, etc.), synthetic (eg, polyamide, polyester, polyacrylonitrile, polyvinyl alcohol, polypropylene, polyaramid, etc.) inorganic (eg, glass fiber, asbestos, carbon fiber). It can be appropriately selected and used regardless of the material.

In another embodiment of the fixing structure shown in FIG. 5, the front and rear double-sided cloth 7 of the joint corresponding portion 3 of the first member 1 is overlapped and the cloth 7 is sewn and fixed to the first member 1 with the suture thread 4. ing. In this case, the bonding surfaces 6 of the second member 2 are formed on the front and back surfaces of the first member 1.
Are fixed and the compound thread is filled into the needle thread portion of the sewing thread 4 penetrating the front and back sides, so that the pair of joint surfaces 6
The fixing strength of can be increased.

In another embodiment of the fixing structure shown in FIG. 6, a plastic cloth member 11 is superposed on the joint corresponding portion 3 of the first member 1 provided for fixing the first member 1 and the second member 2. And fusing 15 (see FIG. 6A). Preferably, the size of the fabric member 11 should extend outside the joint corresponding portion 3. Plastic material used here 11
Is a plastic (eg polyethylene, polyester, polypropylene, polyvinyl alcohol, polyamide, ethylene vinyl acetate copolymer, polyvinyl chloride, etc.) whose surface or spinning is a fiber layer, and these are appropriately selected and used according to the purpose. can do. Further, in the present invention, a mesh made of the same material as the cloth member or another mesh made of plastic may be used instead of the cloth member.

The plastic cloth member 11 is made of FRP.
When the second member 2 composed of layers is formed into a desired shape, it is covered with the compounded resin 10 and cured. The rest of the configuration is the same as that of the above-mentioned embodiment, so its explanation is omitted. The fabric member 11 may be fused 15 to the joining corresponding portion 3 either before or after forming the second member 2. Further, the cloth member 11 may be fused to the joining corresponding portion 3 and then the first member 1 and the second member 2 may be sewn with the sewing thread 4 (see FIG. 6B). The rest of the configuration is the same as that of the above-mentioned embodiment, so its explanation is omitted.

Next, FIG. 7 shows an example of a structure using the fixing structure of the above embodiment. In this structure, the composite material sheet is composed of the first member 1 between the reinforcing pillars standing in the four corners and having an angled cross section, and the reinforcing crosspieces that are laterally bridged between the adjacent supporting pillars. Therefore, the entire structure can be formed of a plastic member without using a metal member.

FIG. 8 shows a different embodiment applied to the frame portion for the lid of the flex container. In this embodiment, a cylindrical lid frame portion 20 having a flange F at the end portion is composed of the second member 2, and the tubular portion is extended to the frame portion 20 without bending along the flange F. A first member 1 made of a flexible sheet is fixed so as to extend upward. This fixing structure has the above-mentioned first member 1
Any of the embodiments in which the member 2 is fixed (FIGS. 3 and 5) may be used.

In the above embodiment, the first member 1 of the flexible sheet is
Although it is composed of a flexible plastic and a fiber layer, in the present invention, it may be composed of only sheet-shaped plastic or rubber. In this case, sewing thread 4
The first member 1 is sewn on the front and back to form the joint corresponding portion 3. The first member 1 may remain flat, but the end portion may be folded back and the folded portion may be integrally sewn with the suture thread 4 to form the joining corresponding portion 3. The first member 1 may be a composite sheet made of plastic and a fiber layer as described above, or may be a sheet-shaped single material made of plastic or rubber. The rest of the configuration is the same as that of the above-mentioned embodiment, so its explanation is omitted.

Next, in the present invention, a blocking member 12 such as packing may be built in the fixed portion of the first member 1 and the second member 2 so as to have a liquid or gas blocking property. In the embodiment shown in FIG. 9, the blocking member 1 is attached to the first member 1.
2 are attached in contact with each other, and the blocking member 12 is built in by fixing the first member 1 and the second member 2 together. Thus, the built-in blocking member 12 can provide the fixed portion with a liquid or gas blocking property. In the case of the present embodiment, the blocking member 12 includes the first member 1 and the second member.
Although the case where the member 2 is not fixed to the first member 1 in the process of fixing the member 2 is shown, the blocking member 12 may be fixed to the first member 1 in the present invention. A member having a barrier property may be used together with the blocking member 12.

In the embodiment shown in FIG. 10, the first member 1 is folded back and sewn with the suture thread 4, but the folded back portion may be fused. Similarly, the fabric may be sewn with the suture thread 4 with the folded ends sandwiching the front and back sides of the first member 1 or fused 15 (FIG. 11).
(See (a)). Further, the pair of cloth members 11 which are not folded back may be sewn with a suture thread 4 by sandwiching the front and back of the first member 1 between the separated end portions (FIG. 11).
(See (b)).

In the above-mentioned embodiment, an example is shown in which the cloth is fixed to the first member only by sewing, but in the present invention, a mesh is used instead of the cloth, and the mesh is fixed to the first member by sewing. May be. In short, the cloth or mesh to be sewn to the first member may be a core material that is integrally fixed to the second member, and the cloth or mesh is a material that can be fused to the first member. Alternatively, a non-fusing material may be used, and any of them can be used. Next, although the second member is made of FRP in the above-mentioned embodiment, it may be made of a combination with another material and partially has an FRP layer. In other words, it goes without saying that various design changes can be made without changing the gist of the present invention.

[0024]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, even if different plastic members are difficult to bond at the interface, the thread is passed through the first member from the front to the back, and the seam and the second member are It is possible to secure the peeling strength to an appropriate level by fixing. Further, by overlapping the cloth on the first member and passing the sewing thread through the front side and the back side of the cloth, the seam of the cloth and the sewing thread is fixed to the second member, so that the peel strength can be more firmly secured. . Therefore, it is possible to replace the location where metal has been used in the past with FRP, so that it is possible to increase the degree of freedom of the shape, reduce the weight of the structure, and greatly reduce the cost, which is extremely useful.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a first embodiment of a plastic fixing structure.

FIG. 2 is a sectional view of an essential part showing a second embodiment of a plastic fixing structure.

FIG. 3 is a cross-sectional view of essential parts showing a third embodiment of a plastic fixing structure.

FIG. 4 is a cross-sectional view of essential parts showing a fourth embodiment of a plastic fixing structure.

FIG. 5 is a cross-sectional view of essential parts showing a fifth embodiment of a plastic fixing structure.

FIG. 6 (a) is a cross-sectional view of a main part showing a sixth embodiment of a plastic fixing structure, and FIG. 6 (b) is a cross-sectional view of the main part showing the seventh embodiment.

FIG. 7 is a perspective view showing a case where the embodiment is used for molding a structure.

FIG. 8 is a sectional view of an essential part showing a case where the embodiment is used for a lid part of a flex container.

FIG. 9 is a sectional view of an essential part showing an eighth embodiment in which a blocking member is incorporated in a plastic fixing structure.

FIG. 10 is a sectional view of an essential part showing a tenth embodiment of a plastic fixing structure.

FIG. 11A is a cross-sectional view of an essential part showing a ninth embodiment of a plastic fixing structure, and FIG. 11B is a cross-sectional view of the essential part showing a tenth embodiment.

[Explanation of symbols]

1st member 2 Second member 2A connection part 2B reinforcement frame 3 Joint corresponding part 4 sewing thread 5 seams 6 joint surface 7 cloth 10 compounded resin 11 Fabric members 12 Blocking member 15 Fusion 16 Lid 20 Fiber reinforced layer F flange

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenichi Iimura             511 Onnakata, Shimodate-shi, Ibaraki Taiei Co., Ltd.             Inside the factory (72) Inventor Yoshihiko Sasaki             8-3 Chuo 8-chome, Ami-cho, Inashiki-gun, Ibaraki Prefecture             Inside the Product Research Center, Mitsubishi Chemical F-term (reference) 4F100 AK01A AN00A BA02 BA03                       BA10A BA10B DG06A DG06C                       DG11A DG11C DH02B EC091                       JK06                 4F211 AA45 AD16 AD19 AD20 AG03                       TA08 TC02 TC20 TC21 TD11                       TH02 TH30 TJ30 TN85

Claims (7)

[Claims] 1. A first member made of a flexible sheet or plate composed of plastic and a fiber layer, a sewing thread sewn through the front and back of the first member, and a resin mixture containing a fiber-reinforced layer. A second member having an FRP layer formed by being impregnated and cured, and is fixed to the FRP layer of the second member with a compounding resin via a sewing thread sewn to the first member. Adhesive structure of plastic to be used. 2. A first member made of a flexible sheet or plate made of a single plastic or rubber material, and a sewing thread sewn through the front and back of the first member.
A second member having a FRP layer formed by impregnating and curing a resin mixture in a fiber reinforced layer, and fixing the compound resin to the FRP layer of the second member through a sewing thread sewn to the first member. A plastic fixing structure characterized by 3. A fabric or mesh formed by sewing a sewing thread on the first member is provided, and the second member is made of a compounded resin via the fabric or mesh sewn to the first member and the sewing thread. 3. The plastic fixing structure according to claim 1 or 2, wherein the plastic fixing structure is fixed to the FRP layer. 4. A cloth or mesh made of plastic, which is laminated and fused on the first member, is provided, and the second resin is mixed with the resin through the cloth or mesh fused on the first member.
3. The plastic fixing structure according to claim 1, wherein the plastic fixing structure is fixed to the FRP layer of the member. 5. A plastic cloth or mesh is fusion-bonded to the first member and the cloth or mesh is sewn to the first member with a suture to fix the cloth or mesh to the first member. The plastic fixing structure according to claim 1 or 2, wherein the resin is fixed to the FRP layer of the second member with a compounded resin via the cloth or mesh fixed to the first member. 6. The plastic fixing structure according to claim 1, wherein the first member, the cloth, or the mesh is folded back and overlapped is sewn or fused with a sewing thread. . 7. The first member is attached in a state in which the blocking member is in contact with the first member, and the blocking member incorporated by fixing the first member and the second member has a liquid or gas blocking property. The plastic fixing structure according to any one of claims 1 to 6.