JPH06262730A - Adhesive sheet with fabric - Google Patents

Abstract

PURPOSE:To provide an adhesive sheet with a fabric with excellent characteristics such as adhesive properties with a vulcanized rubber as an adhesive sheet with a fabric used for manufacturing a vulcanized rubber article. CONSTITUTION:A thin polyurethane layer 11 and a thin rubber layer 12 are formed on a fabric 1 to prepare an adhesive sheet l with a fabric. When a vulcanized rubber is prepd., the rubber layer 12 side of the adhesive sheet 1 with the fabric is laminated on the surface of an unvulcanized rubber compsn. so as to brought them into contact with each other and the unvulcanized rubber compsn. is vulcanized by heating and pressing and the rubber layer is simultaneously adhered with the surface of the rubber compsn. and then, the fabric is peeled off. The adhesive properties are improved by adhering with the unvulcanized rubber through this rubber thin layer 12. As the fabric 10, such a fabric having stretchability in the weft direction as a tricot knitted fabric is pref. and a heat-resistant synthetic fiber is pref. as the fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fabric-attached adhesive sheet used in the production of a vulcanized rubber product obtained by laminating and integrally vulcanizing rubber and polyurethane.

[0002]

2. Description of the Related Art When vulcanized rubber is used, for example, as a material for the ground contact bottom surface of footwear, by strongly adhering the vulcanized rubber material to synthetic resin products such as semi-rigid polyurethane or leather products, It is necessary to have durability adapted to a large external force.

In the conventional adhesion treatment, a vulcanized rubber material is once press-molded, then the adhesion surface is buffed to roughen the surface, and the surface is chlorinated, followed by a primer treatment.
Further, an extremely complicated treatment process such as an adhesive treatment is required, and even if such treatment is performed, the adhesiveness cannot be said to be satisfactory.

Further, in order to solve such a problem, as disclosed in JP-B-63-28021, an unvulcanized rubber composition is loaded in a molding die and at least one surface thereof has a specific composition. After loading a perforated film of thermoplastic polyurethane having the following physical properties, by applying a certain amount of heat and pressure to laminate and integrate both, semi-rigid polyurethane by forming a polyurethane thin layer on the surface of the rubber product in advance, Although a method of increasing the adhesive force with a synthetic resin product or the like has been proposed, this manufacturing method has the following problems.

Extra man-hours are required to remove burrs that accompany the vulcanized rubber product during heating and pressurization.

Since the surface state of the polyurethane thin layer formed on the surface of the obtained vulcanized rubber product is smooth, an anchor effect is obtained when it is adhered to a synthetic resin product such as semi-rigid polyurethane or a leather product. Does not work.

When heated and pressed, the product warps due to the difference in shrinkage between the polyurethane film and the rubber composition.

The polyurethane film directly adheres to the mold, and rust or dirt on the surface of the mold adheres to the film surface to deteriorate the adhesiveness.

Therefore, as disclosed in JP-A-3-162955, the polyurethane thin layer side of the base fabric formed by laminating polyurethane on the fabric is superposed so as to be in contact with the unvulcanized rubber composition, and heated and pressed. A vulcanized rubber product obtained by laminating and integrating a vulcanized rubber and polyurethane by vulcanizing an unvulcanized rubber composition, adhering a polyurethane thin layer to the surface of the rubber composition, and then peeling off the cloth. A method of manufacturing has been proposed.

[0010]

In the method for producing a vulcanized rubber according to the latter publication described above, when peeling the cloth, the foil-shaped portion made of rubber and polyurethane is entangled with the cloth together with the burr rubber to be easily separated from the rubber product. This makes it easier to remove rubber burrs, and the unevenness caused by the peeling of the cloth provides the anchor effect of the polyurethane thin layer, as well as eliminates product warpage and prevents the mold from becoming dirty during manufacturing. The problem in the former publication is almost solved.

However, even in that case, the adhesiveness between the rubber composition and the polyurethane film cannot be said to be reliable,
Therefore, it was necessary to perform a primer treatment on the surface of the polyurethane film. Further, in the production of vulcanized rubber products, there are still problems to be solved in the base cloth regarding compatibility with the curved surface of the base cloth when the mold has a curved surface, releasability of the fabric, prevention of adhesion of dirt, etc. There is.

The present invention has been made in view of the above points, and an object thereof is to apply the base cloth used in the method for producing a vulcanized rubber product in the latter publication to a polyurethane thin layer of the base cloth. In order to improve the adhesiveness between the unvulcanized rubber composition and the polyurethane film, and the rubber sheet surface and the polyurethane film, by using the fabric-attached adhesive sheet on which the rubber thin layer is formed in advance, and the production as described above. An object of the present invention is to provide a fabric-attached adhesive sheet that can solve the above problems.

[0013]

Means for Solving the Problems To achieve the above object, the means of the invention as defined in claim 1 is such that the surface of the adhesive sheet with cloth opposite to the cloth is in contact with the surface of the unvulcanized rubber composition. In order to produce a vulcanized rubber product in which the unvulcanized rubber composition is vulcanized by heating and pressurizing it, and the adhesive sheet with cloth is adhered to the surface of the rubber composition, and then the cloth is peeled off. Assume the adhesive sheet with fabric used.

Then, a polyurethane thin layer formed on the cloth is formed on the adhesive sheet with cloth, and a layer which is formed on the polyurethane thin layer and comes into contact with the unvulcanized rubber when the vulcanized rubber product is manufactured. A thin rubber layer is provided.

According to a second aspect of the present invention, in the first aspect of the present invention, the fibers constituting the cloth are heat-resistant synthetic fibers.

According to a third aspect of the present invention, in the second aspect of the present invention, the fibers constituting the cloth are polyester fibers.

According to a fourth aspect of the invention, in the invention of the first aspect, the cloth is stretchable in the weft direction.

According to a fifth aspect of the invention, in the invention of the fourth aspect, the fabric having elasticity in the weft direction is a tricot knitted fabric.

According to a sixth aspect of the present invention, in the invention of the first aspect, the polyurethane thin layer is composed of a two-part mixture of 100 parts by weight of polyurethane and 3 to 5 parts by weight of diisocyanate. is there.

According to a seventh aspect of the invention, in the invention of the first aspect, the rubber thin layer is acrylonitrile.
It is composed of butadiene rubber or NBR-PVC blend material.

[0021]

With the above construction, the invention of claim 1 facilitates the removal of foil-like burrs during the production of vulcanized rubber products,
The anchoring effect of the polyurethane thin layer improves the adhesive strength, the strength of the polyurethane thin layer prevents the product from warping, the adhesion of the polyurethane thin layer is prevented by the adhesion of dirt, and the air is released by the degassing action of the fabric. In addition to preventing the occurrence of gas accumulation and gas accumulation, since the adhesive sheet with fabric and the unvulcanized rubber are adhered via the rubber thin layer, the adhesiveness between the two is improved.

According to the second aspect of the present invention, since the fibers constituting the fabric are heat resistant fibers, the resistance to heat during bonding is secured, and the synthetic fibers have less fluff, so the fabric is peeled off. Adhesion of fibers to the surface of the subsequent polyurethane lamina is reduced.

According to the invention of claim 3, in the function of the invention of claim 2, due to the characteristics of the polyester fiber, the shrinkage of the fabric during heating is reduced, and the compatibility with the mold is particularly good.

According to the invention of claim 4, since the cloth of the adhesive sheet with cloth has elasticity in the weft direction, by peeling the cloth in the longitudinal direction to ensure releasability, it is possible to expand and contract in the weft direction. The suitability for a curved mold is improved.

According to the invention of claim 5, in the operation of the invention of claim 4, the operation of the invention of claim 4 becomes remarkable because the tricot knitted fabric has a large elasticity particularly in the weft direction.

In the invention of claim 6, the softness of the polyurethane thin layer of the adhesive sheet with fabric is optimized, and the penetration into the fabric is suppressed, so that the peelability of the fabric after vulcanization is good. Become.

According to the invention of claim 7, the compatibility between the adhesive sheet with cloth and the unvulcanized rubber via the rubber thin layer is good.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional structure of the adhesive sheet with cloth 1 according to the present invention. The adhesive sheet with cloth 1 is made of a polyester tricot knitted cloth or the like which is stretchable in the weft direction or weft. A polyurethane thin layer 11 and a rubber thin layer 12 made of rubber such as NBR are sequentially provided on a cloth 10 made of a crimped woven fabric.

Next, FIGS. 2 (a) to 2 (d) show a method for producing a vulcanized rubber product using the adhesive sheet with fabric 1 described above. First, the unmolded lower mold 4 is not yet processed. The vulcanized rubber composition 2 was previously weighed and loaded according to a conventional technique to such an extent that rubber burrs were produced, and the unvulcanized rubber composition 2 was provided on the upper surface thereof with the above-mentioned adhesive sheet with cloth 1 prepared in advance. The rubber thin layer 1
2 is placed so that the rubber composition 2 is in contact with the rubber composition 2 (see (a) in the figure).

Next, the upper mold 3 is closed and the mold temperature is 120 ° C.
~ 180 ℃, press pressure 100kg / cm ² ~ 200kg /
The rubber thin layer 12 of the fabric-attached adhesive sheet 1 is adhered onto the rubber composition 2 by applying heat pressure at about cm ^{2 for} about 3 to 10 minutes (see (b) in the same figure). At this time, the surplus rubber composition 2 generates burr rubber bg in which the rubber protrudes in the groove 6 through the parting lines of the upper and lower molds 3 and 4, and the polyurethane thin layer 11 and the rubber thin layer 12 are parted. The thickness remaining on the line portion and connected to the burr rubber bg is 0.
A thin foil portion f having a thickness of about 01 mm to 0.1 mm is formed.

After the upper mold 3 is opened, the cloth 10 in which the burr rubber bg is entangled is peeled off while the temperature is high, and the foil portion f is entangled in the cloth 10 and completely separated from the rubber product. (See (c) in the figure).

A polyurethane thin layer 1 laminated and adhered on the vulcanized rubber 2 thus obtained through a rubber thin layer 12
The surface of the cloth 10 is transferred to the surface of No. 1 and fine unevenness 5
Are formed (see (d) in the figure).

When the design engraved on the lower die 4 is slow to be engraved, the cloth 1 in which the burr rubber bg is entangled.
When 0 is gripped, the rubber product may be easily taken out from the lower mold 4. In such a case, the target rubber product can be obtained by immediately grasping and peeling off the cloth 10 in which the burr rubber bg is entangled and the end of the rubber product while taking out.

The vulcanized rubber product obtained as described above becomes practical when it is used, for example, as a grounding bottom surface of footwear. That is, since the vulcanized rubber product has fine irregularities on the surface of the polyurethane thin layer 11, when it is provided as a ground contact bottom surface of the footwear by injection molding of the footwear sole using the undiluted polyurethane solution, the polyurethane thin material of the footwear sole body is used. An anchor effect acts on the layer 11, and it can be provided without using any primer or adhesive.

Next, a method of using the above vulcanized rubber product as the ground contact bottom surface of footwear will be described with reference to FIG.

In FIG. 3, a cover 24 is hung on the last 21, a side mold 22 and a bottom mold 23 for forming the bottom of the footwear are combined, and the polyurethane stock solution is injected into the cavity formed by these through the injection port a. The direct sawing method will be described. As is clear from the figure, the polyurethane thin layer 11 of the vulcanized rubber product 27 is received and held upward at a predetermined position of the bottom mold 23, and in this state, the polyurethane stock solution is injected into the cavity as usual. Then, the foamed polyurethane thin layer 28 is formed by foaming. At this time, vulcanized rubber product 2
Unlike the conventional method, it is not necessary to apply a primer, an adhesive, or the like to 7. Then, the footwear having the vulcanized rubber product 27 as the ground contacting bottom surface can be obtained by processing in the usual manner.

Alternatively, instead of using the direct sawing method as described above, the footwear can be obtained by molding the sole body of the footwear and then laminating the sole body to the cover and the insole. The bottom body of the footwear can be molded by a conventional method using a mold for molding the bottom of the footwear. For example, as shown in FIG. 4, a cavity formed by combining the upper mold 31 and the lower mold 32 by holding the polyurethane thin layer 11 of the vulcanized rubber product 33 upward and receiving it at a predetermined position of the lower mold 32. An undiluted polyurethane solution is poured into the foam and foamed to form a foamed polyurethane thin layer 35. Then, the bottom body of the footwear having the vulcanized rubber product 33 as the ground contact bottom surface can be obtained by molding in the usual manner. In this case as well,
There is no need to apply a primer or adhesive to the vulcanized rubber product.

Therefore, in the above embodiment, the following operational effects can be obtained.

(1). The burr rubber bg formed on the parting line portion, the foil-shaped portion f including the rubber thin layer 12 and the polyurethane thin layer 11 is used for peeling the cloth 10 when the fabric 10 is peeled off.
Since it is entangled with the fabric 10 and completely separated from the rubber product, it is extremely easy to remove the foil-like burrs having a thickness of about 0.01 mm to 0.1 mm, which has been a serious problem in the prior art. You can

(2). The vulcanized rubber product comprises a polyurethane thin layer 1 bonded onto a vulcanized rubber 2 via a rubber thin layer 12.
Since the surface of the cloth 10 is transferred to the surface of 1 and fine irregularities 5 are formed, when this vulcanized rubber product is used for the ground contact surface of the footwear sole, etc., a synthetic resin product such as semi-rigid polyurethane or leather As a result of the anchor effect when bonding to a product or the like, the adhesive strength between both materials is significantly improved, and it is possible to omit the conventional selection of an adhesive and complicated bonding work.

(3). When the unvulcanized rubber composition 2 moves along the cavity in the molding die during heating and pressurization in the method for producing a vulcanized rubber product, the polyurethane thin layer 11 on the rubber composition 2 is supported by the fabric 10. Therefore, even if it is thin, it does not cause a tear. Therefore, it is not necessary to make the polyurethane thin layer 11 thicker than necessary to have toughness as in the conventional case. Also, as a result,
The vulcanized rubber product after molding does not hinder the flexibility of the rubber and does not warp due to the shrinkage ratio of the polyurethane thin layer 11.

(4). During the heating and pressurization in the method for producing a vulcanized rubber product, the polyurethane thin layer 11 is protected by the cloth 10 in the molding dies 3 and 4, so that it does not come into direct contact with the dies 3 and 4. Therefore, rust and dirt on the surfaces of the molds 3 and 4 do not adhere to the surface of the polyurethane thin layer 11 and hinder the adhesion.

(5). During heating and pressurization in the method for producing a vulcanized rubber product, the molds 3 and 4 and the polyurethane thin layer 11 or the unvulcanized rubber composition 2 are used because the mesh of the fabric 10 acts as a gas vent. No air or gas accumulation on the contact surface. Further, since the fabric 10 is interposed, the mold release is extremely smooth.

In addition, (6). Since the rubber thin layer 12 is interposed between the vulcanized rubber 2 and the polyurethane thin layer 11, the adhesive strength is increased and the adhesiveness is increased as compared with the case where the vulcanized rubber 2 and the polyurethane thin layer 11 are directly bonded. Can be improved. Further, this makes it possible to omit the primer treatment on the surface of the polyurethane thin layer 11.

The unvulcanized rubber used in the above method for producing a vulcanized rubber product includes natural rubber, styrene-butadiene copolymer (SBR), acrylonitrile-butadiene copolymer (NBR) and isoprene rubber (IR). Rubbers that are widely used as molding materials for shoes and other rubber products such as butadiene rubber (BR) are used, and at least one of them is used. These unvulcanized rubbers may contain known fillers, cross-linking agents, anti-aging agents, softening agents,
An accelerator, an activator, a pigment, etc. are appropriately mixed and used as an unvulcanized rubber composition. For example, fillers such as calcium carbonate, finely divided silicic acid, and clay; crosslinking agents such as sulfur and zinc white; antioxidants such as styrenated phenol and other phenolic compounds; softeners such as polymeric fatty acid esters , Higher fatty acids such as stearic acid, process oils such as naphthenic oils, factices such as black sab and white sab, DOP, etc .; accelerators such as 2-mercaptobenzothiazole and dibenzothiazyl disulfide such as thiazoles Examples thereof include agents, thiuram-based accelerators such as tetramethylthiuram monosulfide; activators such as diphenyldicyclohexylamine and polyethylene glycol; examples of pigments include titanium oxide, red iron oxide, and various organic pigments. The rubber content in the unvulcanized rubber composition is not particularly limited as long as the function as a rubber product is not lost, and it is usually good to be about 20 to 90% by weight.

The fabric 10 in the adhesive sheet with fabric 1 may be, for example, a woven fabric, a non-woven fabric or a knitted fabric made of fibers such as natural fibers and synthetic fibers. It is preferably elastic. The stretchability in the weft direction improves the conformability of the shape to the mold having a curved surface, and the stretchability in the weft direction does not significantly increase the stretchability.
This is because it can be easily peeled off. In addition, since heat is applied when the unvulcanized rubber 2 is bonded, heat-resistant fibers are preferable, and natural fibers may cause fluff or dirt to adhere to the polyurethane thin layer 11 after the fabric 10 is stripped off. Synthetic fibers with less such deposits are preferred.

In particular, when the fibers of the cloth 10 are made of polyester fibers, there are advantages that the deposits after the cloth 10 is peeled off can be reduced and the shrinkage of the fibers during heating can be suppressed to be small.

Furthermore, by making the fabric 10 a tricot knitted fabric, it is possible to secure a large degree of stretchability in the weft direction.

The polyurethane laminated on the fabric 10 in advance means a polyurethane obtained by reacting at least one of polymer glycols having an average molecular weight of 1000 to 4000, organic isocyanates and chain extenders.

Further, as the above-mentioned polymer glycols, for example, polyethylene adipate glycol, polypropylene adipate glycol, polypropylene adipate glycol, polyhexamethylene adipate glycol, and their copolymer glycols, polyether diols such as polytetramethylene glycol, etc. Can be mentioned. Examples of organic isocyanates include tolylene diisocyanate (TDI), diphenylmethane-4,
4'-diisocyanate (MDI), xylylene diisocyanate (XDI), naphthylene diisocyanate (NDI), diphenylmethane-4,4'-diisocyanate hydrogenated product (HMDI), xylylene diisocyanate hydrogenated product (HXDI), hexamethylene diisocyanate (HMDI) and isophorone diisocyanate (IDI). As chain extenders,
Examples thereof include low molecular weight diols having two active hydrogen atoms and low molecular weight diamines.

In particular, the polyurethane thin layer 11 is formed by a two-part blend of 100 parts by weight of polyurethane and 3 to 5 parts by weight of diisocyanate.
The softness of the fabric can be adjusted to an appropriate degree, the fabric 10 is impregnated with polyurethane, and the fabric 10 becomes difficult to peel off.
It is possible to prevent the adhesiveness with the rubber thin layer 12 from being deteriorated.

The above-mentioned polyurethane is formed into a film in advance when it is used for laminating on the fabric 10. The thickness of the film is set as a grounding bottom surface of the vulcanized rubber product of the present invention at the time of injection molding of the footwear sole using the undiluted polyurethane solution. There is no particular limitation as long as the adhesive strength can be maintained, but if it is too thin, the adhesive strength with the urethane bottom will be weak, and if it is too thick, the cost will increase. 015
It is preferably about 0.030 mm.

The adhesive force between the fabric 10 and the polyurethane thin layer 11 is 0.1 (kg / cm) or less during processing (cutting, cutting,
Easy to peel off during transportation and pressing, 0.60 (kg /
Since it is difficult to peel off if it is more than cm, 0.2 to 0.4 (kg /
cm) is preferred. Further, the softening point of the adhesive sheet with fabric 1 is preferably about 150 ° C. ± 5 ° C. because it penetrates into the resin and becomes difficult to peel off at 145 ° C. or less.

Next, in the adhesive sheet with cloth 1, the rubber thin layer 12 laminated on the polyurethane thin layer 11 is
Since it improves the adhesion to the unvulcanized rubber 2, it is preferable that it is flexible and familiar with the unvulcanized rubber 2. In particular, acrylonitrile-butadiene rubber (NB
R) or NBR-PVC blends are suitable. The thickness is preferably 0.015 to 0.030 mm. However, depending on the type of the bottom rubber, a rubber layer made of the same material as the unvulcanized rubber serving as the bottom rubber may be used.

The elongation of the adhesive sheet with cloth 1 as a whole is preferably 30-50% in length and 100-150% in weft.

Next, a specific example of the present invention will be described.

(Specific Example) When manufacturing athletic shoes by the direct sawing method of polyurethane foam, as the adhesive sheet with cloth 1, a cloth 10 made of polyester tricot knitted cloth was used, and polyurethane (manufactured by Dainippon Ink and Machinery Co., Ltd. Cross-linking agent (TDI) (manufactured by Dainippon Ink and Chemicals, Inc.) for 100 parts by weight of Crisphone 5150S)
A polyurethane thin layer 11 was formed using 3 parts by weight of the product name Chrisphone NX). Also, this polyurethane thin layer 1
1. Using NBR-PVC blend material (trade name JSR-NV73 manufactured by Japan Synthetic Rubber Co., Ltd.) on No. 1, thickness 0.02.
A 0 mm thin rubber layer 12 was formed.

A sheet of unvulcanized rubber composition having a thickness of 5 mm and a compounding ratio shown in Table 1 below was used to bond the rubber piece to the most worn stepped part of the shoe sole. Got

[0060]

[Table 1] A piece 2 of the unvulcanized rubber composition was cut out from the sheet in such a volume that rubber burrs were produced, and the piece 2 was loaded into the lower mold 4 for vulcanization molding. Then, the cloth-attached adhesive sheet 1 is cut into a size that covers the lower mold 4, and the rubber thin layer 12 of the cloth-attached adhesive sheet 1 is superposed so as to be in contact with the rubber composition piece 2.
Place the adhesive sheet with cloth 1 on the upper side (first
As shown in the figure, the upper mold 3 is closed and the mold temperature is 150 ° C. and the press pressure is 15
The rubber was vulcanized at 0 kg / cm ² for 5 minutes.

At this time, the surplus unvulcanized rubber composition 2 was
Burr rubber b through the parting lines of the lower molds 3 and 4
yielded g. Further, in the parting line portion, the rubber composition 2, the rubber thin layer 12 and the polyurethane thin layer 11 form an extremely thin foil portion f, which is entangled in the base fabric 10 and continuous with the burr rubber bg ( 2 (b)).

After the upper mold 3 was opened, the burr rubber bg of the cloth-attached adhesive sheet 1 was gripped while the temperature of the product did not drop, and the cloth 10 continuous with this was easily peeled off (see FIG. 3). (See (c)).

At this time, the foil portion f is entangled with the cloth 10 and completely separated from the rubber product, and the rubber thin layer 12 and the polyurethane thin layer 11 are left on the rubber composition 2 evenly laminated and bonded. It was Also, fine irregularities 5 were transferred to the surface of the polyurethane thin layer 11 corresponding to the irregularities of the fabric 10 ((d) of FIG. 2). Thus, a desired vulcanized rubber piece was obtained.

This rubber piece was held at a predetermined position of a shoe sole mold, and a foaming undiluted solution of urethane, which is generally used in the production of sports shoes by the direct sawing method, was cast and cured by a conventional method. Using this as a sample, JIS K6301
As a result of measuring the peel strength of both materials by the test method specified in
The material was destroyed, showing a value of 6 kgf / cm.

[0065]

As described above, according to the first aspect of the present invention, the adhesive sheet with fabric is superposed on the unvulcanized rubber composition, and heated and pressed to vulcanize the rubber and adhere the both. As a composition of the adhesive sheet with fabric used for the production of vulcanized rubber products after the fabric is peeled off, a thin polyurethane layer is laminated on the fabric, and then unvulcanized on this polyurethane thin layer. As a thin rubber layer that is in contact with rubber is laminated, removal of foil burrs is facilitated, adhesive strength is improved by the anchor effect of the polyurethane thin layer, warpage of the product is prevented by improving the strength of the polyurethane thin layer, and polyurethane thin layer is used. In addition to being able to improve the adhesive strength by preventing dirt from adhering to the layer surface and preventing the generation of air and gas accumulation due to the degassing action of the fabric, etc. With vulcanized rubber Wear by performing, it is possible to improve the both adhesion.

According to the invention of claim 2, in the invention of claim 1, since the fibers constituting the cloth are heat-resistant synthetic fibers, the cloth is peeled off while ensuring resistance to heating during bonding. It is possible to reduce the adhesion of the fiber to the surface of the subsequent polyurethane thin layer as much as possible.

According to the invention of claim 3, in the invention of claim 2, since the heat-resistant synthetic fiber is polyester fiber, it is possible to effectively prevent the shrinkage of the fabric during heating.

According to the invention of claim 4, in the invention of claim 1, since the cloth of the adhesive sheet with cloth is stretchable in the weft direction, the peelability of the cloth after rubber vulcanization is improved. It is possible to improve the compatibility with curved-surface molds while securing.

According to the invention of claim 5, in the invention of claim 4, the cloth having elasticity in the weft direction is a tricot knitted fabric. The effect of the invention of claim 4 can be remarkably exhibited.

According to the invention of claim 6, in the invention of claim 1, the polyurethane thin layer is made of polyurethane 10
Since it is composed of a two-part mixture of 0 part by weight and 3 to 5 parts by weight of diisocyanate, the softness of the polyurethane thin layer can be optimized, and therefore the releasability of the fabric and the rubber layer can be improved. It is possible to improve the adhesiveness.

According to the invention of claim 7, in the invention of claim 1, the thin rubber layer is formed of acrylonitrile-butadiene rubber or NBR-PVC blend material.
Good compatibility with unvulcanized rubber can be ensured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of an adhesive sheet with fabric according to an example.

FIG. 2 is a cross-sectional view illustrating a manufacturing process of a vulcanized rubber product according to an example.

FIG. 3 is a vertical cross-sectional view showing a situation in which direct sawing is performed.

FIG. 4 is a vertical cross-sectional view showing a situation where the shoe sole is being molded by injection molding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adhesive sheet with cloth 2 Rubber composition 3,31 Upper mold 4, 32 Lower mold 5 Fine irregularities 6 Grooves 10 Fabric 11 Polyurethane thin layer 12 Rubber thin layer 21 Last 22 Side mold 23 Bottom mold 24 Cover coating 25 Medium Bottom 26, 27, 33, 34 Vulcanized rubber 28, 35 Polyurethane a Injection port bg Burr rubber f Foil-shaped part

Continuation of front page (72) Inventor Hideo Nishi 257-1 Mio, Mihama-cho, Hidaka-gun, Wakayama Prefecture

Claims (7)

[Claims] 1. An adhesive sheet with a fabric is laid so that the surface on the side opposite to the fabric is in contact with the surface of the unvulcanized rubber composition,
With a cloth used for the production of a vulcanized rubber product in which an unvulcanized rubber composition is vulcanized by heating and pressing, an adhesive sheet with cloth is adhered to the surface of the rubber composition, and then the cloth is peeled off. An adhesive sheet, wherein the adhesive sheet with cloth is formed on the polyurethane thin layer and the polyurethane thin layer, and is in contact with the unvulcanized rubber at the time of manufacturing a vulcanized rubber product. An adhesive sheet with cloth, comprising: a rubber thin layer serving as a layer. 2. The adhesive sheet with fabric according to claim 1, wherein the fibers constituting the fabric are synthetic fibers having heat resistance. 3. The adhesive sheet with fabric according to claim 2, wherein the fibers forming the fabric are polyester fibers. 4. The adhesive sheet with cloth according to claim 1, wherein the cloth has stretchability in the weft direction. 5. The adhesive sheet with cloth according to claim 4, wherein the cloth having elasticity in the weft direction is a tricot knitted cloth. 6. The adhesive sheet with fabric according to claim 1, wherein the thin polyurethane layer comprises a two-part mixture of 100 parts by weight of polyurethane and 3 to 5 parts by weight of diisocyanate. Agent sheet. 7. The adhesive sheet with cloth according to claim 1, wherein the thin rubber layer is acrylonitrile-butadiene rubber or N.
An adhesive sheet with cloth, which is made of a BR-PVC blend material.