JPS61286108A - Integral molding of resin and rubber parts - Google Patents

Abstract

PURPOSE:To enable the installation process of rubber packing or the like to be omitted by a method wherein a rubber part having an engaging part with a specified shape is placed in a mold to mold resin so as to integrally mold the resin with the rubber part by pouring the resin into the mold. CONSTITUTION:A rubber part 1 consists of a packing main body 10 by which the sealing property at the joining part is ensured, and an engaging part 11 which prevents the rubber part 1 from coming off by being imbedded in a resin-molded part. The engaging part 11 in the rubber part 1 is of a concave or convex shape so as to act for preventing the part from coming off by being imbedded in the resin-molded part, because the concave or convex part prevents the resin-molded part from coming off by being imbedded in the resin. After the rubber part 1 is seated in a mold 20, a top mold 22 is placed onto the mold 20 and molten resin is packed in a resin filling space 23 formed by the mold 20 and the top mold 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for integrally molding a resin and a rubber part, and more particularly, to a method for integrally molding a resin and a rubber part. Regarding possible methods of attachment.

[Technical background of the invention]

Attaching rubber parts to resin molded products has been practiced for a long time. For example, when joining resin pipes, etc., a rubber gasket is fitted to the joining portion of the resin pipes, and the pipes are tightened and joined via the rubber gasket. Moreover, when joining a resin part to another part, joining is also performed through a rubber O-ring.

By joining through the rubber gasket or O-ring in this manner, the hermeticity of the joint is ensured.

When attaching rubber parts such as those mentioned above to resin molded products,
Conventionally, rubber parts and resin molded products are manufactured in separate processes, and when joining the resin molded products, the worker who performs the joining usually attaches the rubber parts to the resin molded products and performs the joining work. Furthermore, in the process of manufacturing a certain product, when attaching a resin part to another part, even when attaching the above-mentioned O-ring, etc., it is currently often done manually.

However, installing such rubber gaskets or O-rings is not only troublesome, but also requires a considerable amount of time.

In addition, for parts used for medical purposes, it is customary to avoid manual work due to the extreme dislike of adhesion of bacteria, etc., and resin molded products and rubber parts are sterilized and clean. Manufactured. However, in the case of resin molded products that can be replaced at medical sites, even if each part is clean, when attaching the rubber parts to the resin molded product, it is necessary to come into contact with the rubber parts. Since such rubber parts are used for joints, there is a high possibility that they will come into contact with chemicals passing through the interior of the resin molded product, and manual contact is not preferable.

[Summary of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a method for attaching rubber parts to a resin molded product when molding the resin molded product.

Therefore, the method of integrally molding a resin and a rubber part according to the present invention includes a step of producing a rubber part having a concave or convex engaging portion that is buried inside the resin molded product and prevents it from falling off. A step of placing the resin in a mold for molding the resin, and a step of injecting the resin into the mold and molding the resin so that the engaging portion of the rubber component is buried inside the resin molded product. This is a characteristic feature.

According to the method according to the present invention, an engaging portion is formed in a pre-manufactured rubber component so that it can be buried in the resin molded product and prevented from falling off, and the engaging portion is buried in the resin molded product. Since resin is molded, there is an advantage that resin parts can be manufactured in which rubber parts are attached to resin molded products. This eliminates the need to manually attach rubber parts, streamlining the work process, and having the advantage that resin parts can be replaced without manual intervention.

[Detailed description of the invention]

FIG. 1 shows an example of a rubber component used in the present invention. The rubber component 1 used in the present invention includes a gasket main body 10 and a resin molded product to ensure sealing of the joint. It consists of an engaging part 11 that is buried in the rubber part 1 and prevents the rubber part 1 from falling off. The material of such rubber part 1 is
The present invention is not limited to any rubber, and any rubber may be used as long as it does not deteriorate or break at the temperature during resin molding. For example, silicone, NBR, S
The rubber component 1 may be made of rubber such as BR, CR, FPM, or the like.

The engaging portion 11 of the rubber component 1 as described above is buried in the resin molded product and has a concave or convex shape to prevent it from falling off, and this concave or convex portion is buried in the resin. This prevents it from falling off. Therefore, it is clear that the shape of the engaging portion 11 may be various shapes as long as it has such a concave or convex shape for preventing falling off. For example, Fig. 2 (a), (b)
As shown in the figure, it may be formed with grooves or may have an inverted triangular cross section.

Such a rubber component 1 is placed in a mold 20 for molding resin, as shown in FIG. In this case, a groove 21 is formed in the resin molding mold 20 so that at least a part of the packing body 10 is buried in the mold 20, and a part of the packing body 10 is fitted into this groove 21. It is better to match. Further, the above-mentioned engaging portion 11 is placed so as to be buried in the resin molded product and protrude into the resin filling space 23 of the mold 21 (see FIG. 4).

After placing the rubber part 1 in the mold 20 in this way, as shown in FIG. 4, the upper mold 22 is placed over the mold 20,
A resin filling space 23 formed by the mold 20 and the upper mold 22 is filled with molten resin 3 (see FIG. 5). The resin 3 filled in the resin filling space 23 in this way is not fundamentally limited in the present invention. Any resin may be used as long as it can be molded using the mold described above.

For example, it can be a thermoplastic resin such as polypropylene, polycarbonate, etc.

The resin filling space is filled with such resin 3 by a method such as injection, and the filling temperature is preferably 100 to 250°C.

If the temperature is less than 100°C, the resin will not be in a molten state and will be difficult to fill, while if it exceeds 250°C, there is a risk of damaging the rubber component 1. The pressure during this filling is preferably 50 to 150 Kg/cal.

If it is less than 50 Kg/cj, there is a risk that the resin will not be filled properly due to insufficient pressure, and if it exceeds 150 Kg/ci, there is a risk that the rubber component 1 will be damaged.

By filling the resin filling space 23 with resin and cooling it, it is possible to manufacture a resin product in which the engaging portion 11 of the rubber component 1 is buried in the resin molded product 4, as shown in FIGS. 5 and 6. .

In this case, as shown in FIG.
0 protrudes from the resin molded product 4, and when this resin product is joined, the protruding packing body 10 ensures airtightness.

As mentioned above, in the present invention, the rubber component 1 has the engaging portion 11.
is provided so that the engaging portion 11 is buried in the resin molded product 3. In the present invention, such a configuration is adopted because the resin and the rubber component basically do not adhere to each other, so the above-mentioned concave or convex engaging portion is formed to prevent the engaging portion from being buried in the resin. This is because there is a risk that the rubber component 1 may fall off due to thermal contraction of the resin after molding.

That is, resin generally has a high heat shrinkage rate, whereas rubber has a low shrinkage rate, so when the resin contracts, the tension between the resin and the rubber deteriorates, and the rubber part 1 falls off. . However, according to the method of the present invention, the engaging part 11 is formed and the engaging part 11 having a concave or convex shape is buried inside the resin molded product 3 to prevent it from falling off.

In the above explanation, the case of manufacturing joints of resin molded products was explained, but it is clear that the present invention is not limited to such cases, and can be widely applied to cases where rubber parts are attached to resin. be.

Examples according to the present invention will be described below.

Example Using the mold shown in FIGS. 3 and 4, a rubber part made of silicone rubber having the shape shown in FIG. 1 was placed in the mold 20.
The packing body 10 is mounted by inserting a part of the packing body 10 into the groove, and then the upper mold 21 is placed on it, and polycarbonate resin is filled into the resin filling space constituted by the mold and the upper mold at a temperature of 200°C and a pressure. The resin was injected and filled under the conditions of 50 kg/cj, and a resin product as shown in FIG. 6 was manufactured.

In the resin product manufactured in this manner, the rubber component 1 did not fall off, and did not fall off unless the rubber component was pulled with considerable force.

〔Effect of the invention〕

As explained above, according to the method of integrally molding resin and rubber parts according to the present invention, it is possible to successfully attach resin and rubber parts whose adhesion is not very good, and for this reason, it is possible to attach resin and rubber parts well, which is difficult to do in the past. This has the advantage that the process of installing rubber gaskets and the like can be omitted. Furthermore, when applied to the manufacture of medical parts, it is particularly useful when replacing resin products at medical sites because the rubber parts can be replaced without coming into contact with them.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an example of a rubber component used in the method according to the present invention, FIG. 2 is a partial cross-sectional view of another example of the rubber component, and FIGS. 3 to 5 illustrate the method according to the present invention. FIG. 6 is a partial sectional view of a resin product integrally molded by the method according to the present invention. 1...Rubber parts, 10...Packing body, 11.
...Engagement part, 3 ... Molten resin, 4 ... Resin molded product. Applicant's agent Masatoshi Amemiya Figure 1 Figure 3

Claims (1)

[Claims] (1) A process of producing a rubber part with a concave or convex engaging part that is buried inside the resin molded product and prevents it from falling off; This rubber part is placed in a mold for molding the resin. Placement step: Integration of the resin and the rubber part, characterized by including a step of injecting the resin into the mold and molding the resin so that the engaging part of the rubber part is buried inside the resin molded part. Molding method.