JPH03236922A - Formation of resin frame material with metal fitting to plate glass - Google Patents

Abstract

PURPOSE:To form automatically a monolithic molded product where metal fittings are pressure-contacted firmly with a glass surface, by a method wherein mold clamping is performed by fixing plate glass and the metal fittings to a mold by interposing a filmy adhesive agent between them. CONSTITUTION:A metal fittings 22 are arranged by projecting a sticking surface within a hole part 16 of a bottom force 13, to which a bouncing device 18 is provided. Plate glass 25 is fixed to a mold surface of the bottom force 13, the bottom force 13 and a top force 12 are caused to coincide with each other by interposing a filmy adhesive agent between a glass surface 26 and a sticking surface 23 of the metal fittings 22 and a mold 11 is formed by performing mold clamping while pressure- contacting the sticking surface 23 of the metal fittings 23 with the glass surface 26 by the bouncing device 18. A resin material is cast into formed cavity 14. The filmy adhesive agent 28 sticks the sticking surface 23 of the metal fittings firmly to the glass surface 26 by heat obtained by using the resin material, injection pressure and bouncing pressing force by the metal fittings and a monolithic molded product where a fringe part of the plate glass 25 is provided with a resin frame material 30 with the metal fittings is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for forming a resin frame material with metal fittings on a plate glass, and particularly relates to a method for forming a resin frame material with metal fittings on a plate glass, and in particular, a method for forming a resin frame material with metal fittings on a plate glass.
The attachment relates to a method of forming a resin frame material with metal fittings on a glass plate, which is suitable for integrally forming appropriate metal fittings such as insert bolts required for the glass plate.

[Prior Art] In recent years, many window glasses used in vehicles, buildings, etc. have been provided that have a structure in which a resin frame material made of moldings, gaskets, etc. is integrally formed around the periphery of a plate glass. It is becoming.

Such a plate glass with a resin frame as an integrally molded product is usually produced by placing the plate glass in a mold, then injecting and filling the cavity formed in the mold with molten resin, cooling it,
It is often formed by an injection molding method in which the mold is removed after solidification.

Furthermore, recently, compared to the above-mentioned injection molding method, an injection molding method (RIM method) has also been adopted more frequently. -' On the other hand, among the integrally molded products formed using each of the above methods, there are inserts that are necessary when attaching the plate glass to the resin frame parts called moldings and gaskets to the car body side, frame side, or window frame. Some require that appropriate metal fittings such as bolts and hinges be fixed in advance and assembled between them.

FIG. 4 shows an example of the configuration of a conventional mold used for forming an integrally molded product in which metal fittings are integrally incorporated.

According to the figure, a mold 1 is composed of an upper mold 2 and a lower mold 3.
A metal fitting 7 such as an insert bolt placed in the peripheral edge of the glass plate 8 and the hole 6 is fixed through a cavity 4 formed when the mold is clamped. After the peripheral edge of the plate glass 8 and the metal fittings 7 are fixed and clamped in this way, the resin material is injected and filled into the cavity 4 through the injection path 5, thereby forming the resin frame material into the plate glass 8. It can be integrally molded on the periphery of the

Therefore, after demolding, the metal fittings 7 are attached to the peripheral edge of the plate glass 8.
It was possible to form a glass plate with a resin frame as a body molded product in a state in which the resin frame was held integrally.

[Problems to be Solved by the Invention] By the way, also by the above method, it is possible to integrally form the resin frame material on the peripheral edge of the plate glass with the metal fittings held therein.

However, in this case, the metal fittings have a structure that is fixed only by the resin frame material, so the durability strength that the structural parts must have, such as the pull-out strength and torque, is determined by the strength of the resin frame material formed. will depend heavily on

However, as for the resin material used, soft polyvinyl chloride (hereinafter referred to as "soft PVC") is often used because it allows relatively low injection pressure and has excellent durability such as weather resistance and water resistance. ing.

In other words, for this type of integrally molded product, in many cases,
The metal fittings are fixed by a resin frame material made of soft PVC whose degree of polymerization is not very high. the result,
Particularly in a hot atmosphere, it is not possible to obtain the required physical strength in terms of bow strength and tear strength, and the application of external forces such as pull-out force and torque may cause the metal fittings to come off or become misaligned. It is more likely to occur.

Occurrence of phenomena such as detachment of metal fittings means that the integral molded product itself may fall off from the vehicle body or frame after installation, and it is necessary to take reliable measures to prevent this. Ta.

On the other hand, to avoid such inconveniences, there is a method in which metal fittings are bonded to the glass plate in advance using an adhesive such as urethane sealant, and then the glass plate is placed in a mold to form a resin frame material. be.

When using this method, the characteristics of the metal fittings, such as bow pulling force and torque, do not depend on the strength of the formed resin frame material.

However, in addition to requiring a separate process for bonding the metal fittings and time for curing the adhesive, relatively high precision is required in terms of the bonding position and the thickness of the adhesive applied. It has been pointed out that, even if it is possible to satisfy the physical property conditions required for a structural component, it is not suitable for industrial mass production due to the complexity of the work.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems observed in the conventional methods, and its structural features include a plate glass and a film-like adhesive on the surface fixed to the plate glass. A resin material is injected into a cavity formed in the mold after placing a metal fitting in the mold which is arranged to allow the resin to be applied and to be pressed against the glass surface when the mold is clamped. The metal fittings are attached to the plate glass due to the adhesive action of the film adhesive developed by the heat and/or pressure obtained by injecting the resin material, and the cooperative effect of the pressing force applied to the metal fittings during mold clamping. The objective is to integrally form a resin frame material on the peripheral edge of the plate glass while fixing the glass.

In addition, it is preferable to use a silicone rubber-based adhesive as the film adhesive in the method of the present invention, and further, an adhesive primer is applied in advance to the peripheral edge of the glass plate on which the resin frame material is formed. is desirable.

[Function] Therefore, by placing the plate glass and the metal fitting in the mold and clamping the mold, the metal fitting can be automatically brought into pressure contact with the glass surface side. Furthermore, the film adhesive interposed between the fixing surface of the metal fitting and the glass surface can develop adhesive strength by the heat brought about by the resin material injected into the cavity and the injection pressure. Therefore, when the resin frame material is integrally formed on the peripheral edge of the plate glass, the metal fitting itself can also be fixed to the glass surface at the same time.

Therefore, according to the method of the present invention, it is possible to form an integrally molded article with a metal fitting whose fixing strength does not depend on the resin frame material formed.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view of essential parts showing an example of the configuration of a mold used for carrying out the method of the present invention.

According to the figure, the mold 11 is composed of an upper mold 12 and a lower mold 13, and when the mold is clamped, the upper mold 12 and the lower mold 1
3, an injection path 15 for the resin material to be injected;
It is possible to form the cavity 14 in a desired shape.

The mold 11 also includes metal insert bolts, hinges, nuts, etc. necessary for attaching the plate glass to the vehicle body, the frame, or the window frame at predetermined locations corresponding to the peripheral edge of the temporary glass 25 to be placed. In order to place the insert metal fitting 22 made of hard plastic, the fixing surface 23 thereof is exposed on the glass surface 26 side, and a hole is made in which the metal fitting 22 can be accommodated depending on the specific shape of the metal fitting 22. 6 is formed on the upper mold 12 and/or the lower mold 13, in the illustrated example, the lower mold 13.

In addition, a suitable urging means 18 is provided in the hole 16 to apply a necessary pressing force to the glass surface 26 side when the metal fitting 22 is accommodated when the mold is clamped, as shown in FIG. Bottom 1
A biasing means 18 is provided which includes a coil spring 19 disposed on the 7 side and a support piece 20 interposed to reliably support the metal fitting 22 side.

Further, a sealing member is provided to prevent resin material from entering the hole 6.

Thus, one embodiment of the method of the present invention will be described using, as an example, the case where the mold 11 shown in FIG. 1 is used.

First, the metal fitting 22 is placed in the lower mold 13 constituting the mold 11 with its fixing surface 23 protruding into the hole 16 having the biasing means 18 .

Next, a glass plate 25 is placed on the mold surface on the side of the lower mold 13, and a film adhesive 28 is interposed between the glass surface 26 of the glass plate 25 and the fixing surface 23 of the metal fitting 22. The mold surface on the upper mold 12 side is aligned with the mold surface on the lower mold 13 side, and the upper mold 12 and the lower mold The mold 13 is clamped to form the mold 11.

The above example shows a method in which the metal fittings to be inserted are supported by the lower mold in advance, and a film adhesive is applied to the fixing position of the metal fittings on the sheet glass. Temporarily fix the sheet glass at the fixing position with
A resin material may also be injected.

After that, the cavity 1 formed in this mold 11
4, a resin material is injected through the injection path 15.

At this time, the film adhesive 28 is applied to the cavity 14.
Adhesive force is developed by the heat and injection pressure brought about by the resin material injected into the mold, and when the mold is clamped, the metal fitting 2
The fixing surface 23 of the metal fitting 22 is firmly fixed to the glass surface 26 of the plate glass 25 in cooperation with the pressing force applied to the second side.

The resin material injected into the cavity is typically a thermoplastic resin such as polyvinyl chloride that is heated and becomes fluid. Further, the resin material in the case of reaction injection molding is composed of a combination of two or more reactive synthetic resin raw components that can react to form a resin. These components are combinations that react rapidly when mixed to form a synthetic resin, such as a combination of polyurethane resins, and these components are mixed immediately before injection into the cavity. and solidify to form a resin frame material.

After the injected resin material is solidified in the cavity 14, it is removed from the mold 11, and a resin frame material 30 with a metal fitting 22 is attached to the peripheral edge of the glass plate 25 as shown in FIG. 3, for example. It is possible to form an integrally molded article with

The film-like adhesive 28 used in the method of the present invention, including the adhesive primer applied in advance to the peripheral edge of the glass plate 25, has excellent adhesion between glass materials and metal materials. Those whose adhesive strength is developed by being cured by heat and/or pressure are preferably used. in particular,
Under conditions of heat of 50 to 200°C and pressure of 1 to 20 kg/am2, more preferably heat of 80 to 130°C and pressure of 1 to 20 kg/am2.
It is desirable that the material be crosslinked and cured under a pressure of 10 kg/cm2 to develop adhesive strength. Further, the time required for the adhesive force to develop, that is, the time for the film adhesive 28 to cure, is 10 seconds to 10 minutes, preferably 10 seconds to 3 minutes, under the above temperature and pressure conditions.
minutes, more preferably 10 seconds to 1 minute, can be suitably used.

Further, as for the adhesive performance of the adhesive cured under the above conditions, it is desirable that the adhesive strength remains relatively unchanged even in the temperature range of room temperature to 120°C.

The film adhesive 28 that satisfies such performance and curing conditions is, for example, a thermally crosslinkable ethylene-vinyl acetate copolymer resin (hereinafter referred to as "EVAJ"), a thermosetting type, that is, a thermally crosslinkable silicone rubber. , thermally crosslinkable ionomer resins, polyamide resins, etc. can be suitably used, especially thermally crosslinkable ethylene-vinyl acetate copolymer resins with excellent moisture resistance and heat resistance stability, or thermosetting silicone rubber compositions. It is preferable to use one molded into a film or sheet.

Among these, those made of a thermosetting silicone rubber composition molded into a film or sheet are particularly preferred.

Since the present invention is configured in this way, the metal fitting 2
2, when the resin frame member 3° is integrally formed on the peripheral edge of the plate glass 25, the fixing surface 23 can be firmly fixed to the glass surface 26 and bonded.

That is, by placing the plate glass 25 and the metal fitting 22 in the mold ll, clamping the mold, and applying the biasing means 18, the fixing surface 23 side of the metal fitting 22 is automatically pressed against the glass. It can be brought into pressure contact with the surface 26 side. Moreover, the film adhesive 28 interposed between the fixed surface 23 of the metal fitting 22 and the glass surface 26 is
Since the adhesive force can be developed by the heat and pressure brought about by the resin material injected into the glass plate 4, when the resin frame material 30 is integrally formed on the peripheral edge of the plate glass 25, the metal fittings 22 themselves are also simultaneously formed. It can be firmly fixed to the glass surface 26.

Therefore, according to the method of the present invention, it is possible to form an integrally molded product with the metal fittings 22 whose fixing strength does not depend on the resin frame material 30 to be formed.

Therefore, the metal fittings 22 can be automatically fixed to the glass surface 26 at the same time when the resin frame material 30 is integrally molded to the plate glass 25 without requiring a separate bonding process, eliminating complicated manual work. It is possible to industrially mass-produce high quality and durable integrally molded products.

The characteristics of the integrally molded product obtained by the method of the present invention (product implemented by the present invention) and the integrally molded product obtained using the conventional type mold shown in FIG. 4 (product implemented by the conventional method) will be compared. Therefore, the size is 120mm x 80mm and the thickness is 3.
Using 5 mm tempered glass, separate integrally molded products having the shape shown in FIG. 3 were obtained in the following manner.

・Conventional method applied A PVC adhesive primer is applied to a glass plate cut into a predetermined shape, and an insert bolt is placed in the mold. Next, after drying and heating the glass, it was placed in a mold, and then the mold was closed and soft PVC with a Shore hardness of 75 and an average degree of polymerization of 800 was injected to form an integrally molded product with an insert bolt (referred to as molded product A). Obtained.

- In the lower mold of the mold for implementing the present invention, a coil spring and a support piece for the insert bolt are arranged in advance in the hole for insert bolt placement.

In addition, in the same way as the conventional method described above, a primer for PVC adhesion was applied to the plate glass cut into a predetermined shape, an insert bolt was placed in the mold, and a 1 mm thick silicone rubber was placed between the bolt and the plate glass. Insert the film adhesive and close the mold. After that, Shore hardness is 7.
5. Soft PVC having an average degree of polymerization of 800 was injected to obtain an integrally molded product (referred to as molded product B) having an insert bolt.

The thus obtained molded product A and molded product B were subjected to evaluation tests for torque and pull-out strength.

Table 1 shows the results obtained from this evaluation test.

5 Table 1 According to the above table, in both the torque and pullout strength evaluation tests for insert bolts, the products implemented using the present invention significantly exceeded the strength of the products implemented using the conventional method at room temperature and at 80°C. It was confirmed that In particular, it was confirmed that at 80°C hot, the strength of the products implemented by the present invention was significantly higher than that of products implemented by the conventional method6, confirming that the method of the present invention has a remarkable effect. Ta.

[Effects of the Invention] As described above, according to the present invention, by placing the plate glass and the metal fitting in the mold and clamping the mold, the metal fitting can be automatically brought into pressure contact with the glass surface side. The film adhesive interposed between the fixed surface of the metal fitting and the glass surface can naturally develop adhesive strength due to the heat and pressure brought about by the resin material injected into the cavity. , the resin frame material can be integrally formed on the peripheral edge of the plate glass, and at the same time the metal fittings themselves can be fixed to the glass surface.

In addition, since a film adhesive is used, there is no need for the adhesive application process or curing process of the applied adhesive as in conventional methods, and accurate control of the amount of adhesive applied is no longer required. This provides the process advantage of eliminating

Therefore, according to the method of the present invention, it is possible to industrially mass-produce highly durable and homogeneous integrally molded products with metal fittings whose fixing strength does not depend on the resin frame material formed. In particular, when a silicone rubber sheet adhesive is used, sufficient pull-out strength and torque strength can be obtained even when hot at room temperature, regardless of the physical properties of the resin that fixes the metal fittings.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part showing an example of the structure of a mold used for carrying out the method of the present invention, and FIG. 2 is an exploded perspective view of a main part showing a specific example of a biasing means that constitutes a method of the present invention. , FIG. 3 is a perspective view showing an example of an integrally molded product obtained by the method of the present invention,
FIG. 4 is a sectional view of essential parts showing an example of the configuration of a mold used for implementing the conventional method. 11... Molding mold, 12... Upper mold, 13.
...Lower mold, 14...Cavity, 15.
... Injection path, 16... Hole, 17... Bottom surface, 18... Biasing means, 19... Coil spring, 20... Support piece, 22... Metal fitting,
23...Fixed surface, 25...Plate glass,
26...Glass surface, 28...Film adhesive, 30...Resin frame material 0

Claims (3)

[Claims] (1) After placing a plate glass and a metal fitting in which a film adhesive is interposed on the surface to be fixed to the plate glass and can be pressed against the glass surface when the mold is clamped, in a mold, A resin material is injected into the cavity formed in this mold, and the adhesive action of the film adhesive developed by the heat and/or pressure brought about by the injection of the resin material, and the metal fittings when the mold is closed. A method for forming a resin frame material with metal fittings on a glass plate, characterized by integrally forming the resin frame material on the peripheral edge of the glass plate while fixing the metal fittings to the glass plate by a cooperative action with a pressing force applied by. (2) The method for forming a resin frame material with metal fittings on a plate glass according to claim 1, wherein the film adhesive is a silicone rubber adhesive. (3) The method for forming a resin frame material with metal fittings on a glass plate according to claim 1 or 2, characterized in that an adhesive primer is applied in advance to the peripheral edge of the glass plate on which the resin frame material is formed.