JPH05245942A - Rubber-resin combined product and production of the same - Google Patents

Abstract

PURPOSE:To prevent the generation of flashes and cracks in a resin part in the vulcanization-bonding between a rubber part and a resin part by forming a small rib on the bonding interface between the two parts. CONSTITUTION:Unvulcanized rubber is placed on a bonding part 13 coated with an adhesive. The rubber, after being covered with a mold 2, is vulcanized by compression-heating to prepare a rubber part 31. The mold 2 contacts a small rib 14, which is loaded with pressure, to protect the entire top of a resin part 1 from being loaded with pressure so that cracking in the resin part 1 can be prevented. The small rib 14 is somewhat crushed by the pressure and heat of the mold 2 before a strong stress being applied to the main body of the resin part, effecting the relaxation of impact. Moreover, since the small rib 14 surrounds the bonding part 13, the generation of flashes is also prevented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a rubber-resin composite article and a method for producing the same, and more specifically, a structure of the rubber-resin composite article which does not cause burrs in producing the above-mentioned rubber-resin composite article, and The manufacturing method is related.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a rubber-resin composite product such as a valve, a metal mold is formed on the top (adhesive portion) of a resin valve body 1 which is preformed as shown in FIG. 4, for example. The unvulcanized rubber 3 is provided by covering the surface of the sheet 2 by compression molding, transfer molding, or injection molding, and is heated and vulcanized while applying pressure.

In this case, as in the case of producing a rubber-metal composite product, a taper 11 is applied to a portion corresponding to the top of the valve body 1 of the mold as shown in FIG. Or the blade 12 is provided at the boundary of the mold bonding portion as shown in FIG.

According to the above-mentioned structure, although it is effective in preventing the occurrence of burrs, a stress which is stronger than that of the mold is applied in the first heated state, so that the valve body 1 is likely to be cracked. There are drawbacks. Secondly, in the case of the structure shown in FIG. 5, in particular, in the case of a product having a small wall thickness, the resin wall thickness is further reduced by the blade, so that the strength is lowered. Further, in the case shown in FIG. 5, since the mold portion 21 of the blade 12 has an acute angle, this portion is easily broken and has a short life of the mold.

The present invention has been made in view of the above problems, and when the rubber component and the resin component are bonded together, the resin component is not easily broken and the strength of the resin component is not impaired, and in addition, the mold is used. It is an object of the present invention to provide a rubber-resin composite product whose life is not shortened and a method for producing the same.

[0006]

In order to solve the above problems, the rubber-resin composite product according to the present invention is a rubber-resin composite product obtained by vulcanizing and adhering a rubber part to a resin part having a predetermined shape. It is characterized in that minute ribs are provided at the boundaries of the bonding parts of the resin component for bonding the.

The method for producing a rubber-resin composite article according to the present invention is a method for producing a rubber-resin composite article in which an unvulcanized rubber is provided on a preformed resin part, and pressure is applied by a mold to perform vulcanization adhesion. It is characterized in that a minute rib is projected on the outer periphery of an adhesive portion of the resin component on which the unvulcanized rubber is to be provided, and the die is brought into contact with the minute rib to be vulcanized and adhered.

According to the present invention, since the minute ribs are provided so as to project at the boundary of the rubber-bonded portion of the resin component, when the rubber component is bonded, the pressure is concentrated on the minute ribs. There is an advantage that the resin parts are not cracked. Furthermore, since the wall thickness is not reduced, the strength does not decrease. In addition, it is not necessary to form an acute-angled part in the mold, and the structure of the mold is simple, so that the life is extended and the cost is reduced.

The present invention will be described in more detail.

FIG. 1 shows a cross section of a resin part 1 of a rubber-resin composite product of the present invention. As is apparent from this figure, a minute rib is formed surrounding the rubber-bonded portion 13 of the resin part 1. 14 is formed. In this configuration example, the rib 14 has a triangular cross section, but the present invention is not limited to this and may have another shape such as a square cross section.

The height h of the minute ribs 14 is preferably about 0.1 to 0.4 mm. If it is less than 0.1 mm, the effect of providing the minute ribs 14 is small, and burrs are likely to occur, or cracks may occur. On the other hand, if it exceeds 0.4 mm, the rib's compression margin increases, so that the resin main body may be damaged. A large stress is likely to be applied to the cracks, and cracks are more likely to occur.

When vulcanizing and adhering a rubber component to such a resin component 1, an adhesive portion 13 surrounded by the minute ribs 14 is used.
Apply adhesive to the. In this case, since the adhesive portion 13 is surrounded by the minute ribs 14, the adhesive does not squeeze out, and at that point, it is possible to effectively prevent the formation of burrs.

Next, the adhesive portion 13 coated with this adhesive agent
An unvulcanized rubber is provided in the above, and the mold 2 is covered, and pressure and heat are applied to vulcanize the unvulcanized rubber to obtain a rubber component 31. At this time, the mold 2 comes into contact with the minute ribs 14, and the minute ribs 1
Since pressure is not applied to the entire top portion of the resin component 1 as in the case of FIGS. 4 and 5, the resin component 1 is prevented from being cracked because pressure is applied to the resin component 4. Micro rib 14
As shown in FIG. 2, due to the pressurization and heating of the mold 2, the resin will be crushed to some extent before a strong stress is applied to the resin component main body, and this crushing has the effect of reducing the impact. Further, since the minute ribs 14 surround the adhesive portion 13, no burrs are generated.

Since the structure of the resin component is as described above,
The mold does not have to have a complicated shape as shown in FIGS. 4 to 5, the life of the mold is extended, and the mold manufacturing cost can be reduced. Further, when the minute ribs are formed on the resin component, they can be manufactured integrally and easily by injection molding or the like, so that the cost does not increase.

The material of the resin component 1 is preferably a heat resistant resin because heat is applied during vulcanization, and so-called engineering plastics such as PPS, 6 nylon, 66 nylon and the like can be used. In this case, a resin in which a reinforcing agent such as a reinforcing fiber is mixed may be used. Further, the rubber material to be used is not limited, and any rubber such as NBR, fluororubber, silicone rubber, EPDM can be used.

[0016]

EXAMPLE An experimental test piece as shown in FIG. 3 was manufactured. The resin component was PPS, the diameter was 16 mmφ, and the diameter of the minute rib was 10 mmφ. Further, the height of the test piece is 23 mm, and the thickness of the intermediate rubber portion is 3 mm.
The height of the minute rib was 0.2 mm. Unbranched rubber such as NBR, fluororubber, and silicon rubber is placed on the rubber-bonded portion of this resin component, and the mold is covered to 150 to 180 ° C.
Vulcanization adhesion was performed at the temperature of.

[0017]

According to the present invention, since the minute ribs are provided so as to surround the rubber-bonded portion of the resin component, burrs do not occur when the rubber is vulcanized and bonded, and the mold contacts the minute ribs. Therefore, the resin component is not cracked. Further, the mold does not need to have a special shape, so that there is an advantage that the cost can be reduced and the life of the mold is extended. Further, since the minute ribs also act as a reservoir of the adhesive, there is an advantage that the adhesive does not extend beyond a predetermined portion. Further, the micro ribs have an advantage that they can be easily manufactured by injection molding without any special processing and the cost does not increase.

[Brief description of drawings]

FIG. 1 is a sectional view of an example of a resin component of the present invention.

FIG. 2 is a sectional view of an example of a rubber-resin composite product of the present invention.

FIG. 3 is a cross-sectional view of an experimental test piece manufactured according to the present invention.

FIG. 4 is a cross-sectional view of a conventional rubber-resin composite product.

FIG. 5 is a cross-sectional view of another example of a conventional rubber-resin composite product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin part 13 Adhesive part 14 Micro rib 2 Mold 3 Unvulcanized rubber

[Procedure amendment]

[Submission date] December 8, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[ Claims ]

Claims (2)

[Claims] 1. A rubber-resin composite product obtained by vulcanizing and adhering a rubber component to a resin component having a predetermined shape, wherein a minute rib is provided at a boundary of an adhesive portion of the resin component for adhering the rubber component. -Resin composite products. 2. A method for producing a rubber-resin composite article, comprising pre-molded resin parts provided with unvulcanized rubber, and pressure-bonded by a mold for vulcanization adhesion. A minute rib is projected on the outer periphery of the adhesive part,
A method for producing a rubber-resin composite product, characterized in that the mold is brought into contact with the minute ribs and vulcanized and bonded.