JPS6367125A - Method for forming molding or gasket - Google Patents

Abstract

PURPOSE:To easily form a molding excellent in decorativeness by a method wherein synthetic resin is formed at the peripheral part of a plate glass by supporting part excluding the peripheral part of the plate glass by actuating rods. CONSTITUTION:A plate glass 3 is located between a top force 1 and a bottom force 2. Sealing members 4 and 5 are respectively located between the plate glass and the top force and between the plate glass and the bottom force so as to form a cavity space 13. The peripheral top surface 6 of the plate glass 3, its peripheral undersurface 7 and its end surface are molding-forming surfaces. The other surfaces 9 and 10 are non-molding-forming surfaces. After one sealing member 5 is held by actuating rods 15 so as to make the sealing surer and at the same time to position to the plate glass 3, raw synthetic resin material is poured through a pourer provided in the parting line 14 of the top and the bottom forces in the space 13 of the cavity. A molding 16 is formed through the solidification of said raw resin material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a molding or a gasket around a glass sheet, and particularly relates to a method for forming a molding or a gasket around a glass sheet, and in particular, a molding or a gasket is formed around the glass sheet by injecting a synthetic resin raw material into a mold in which the glass sheet is placed by a reaction injection molding method. The present invention relates to a method of forming a molding or a gasket on a part.

Moldings and gaskets made of synthetic resin for the purpose of decoration or sealing around sheet glass for vehicles such as automobiles or sheet glass for construction (hereinafter both are collectively referred to as moldings).
It is common practice to install. This synthetic resin molding is usually attached to a glass plate by using a pre-formed molding and attaching it to the periphery of the glass plate by means of gluing, fitting, or the like. However, this conventional method is complicated and not economical because it requires molding in advance and attachment to the plate or glass. In addition, moldings having complex shapes or moldings with uneven patterns formed on the surface (J) are difficult to manufacture using conventional molding methods such as extrusion molding.

As a result of researching and considering various methods for attaching synthetic resin moldings to sheet glass, the inventors of the present invention have found that they directly mold synthetic resin moldings around the glass sheet, and thereby remove the synthetic resin moldings and remove the sheet glass. We have found a method to manufacture it in one step. In this method, molding of the synthetic resin molding and attachment to the peripheral area of the sheet glass are performed simultaneously, so the number of steps is omitted and economical efficiency is improved. Furthermore, by molding the synthetic resin around the periphery of the sheet glass, it becomes possible to easily mold moldings with more decorative features and more complex shapes. The present invention is a method for manufacturing sheet glass in which a synthetic resin molding is formed on the peripheral part by this integral molding, that is,
In a method of forming a molding or gasket made of synthetic resin around the periphery of a glass sheet, the glass sheet is placed in a mold and closed, and a sealing member is placed between the inner surface of the mold and the glass sheet to seal the peripheral surface of the glass sheet and the mold. A cavity space is formed which is surrounded by the inner surface and the surface of the sealing member and is used to form a molding or a gasket.The mold is further provided with an operating rod that can be driven from outside the mold, and the operating rod is used to press the sealing member or the sheet glass. The synthetic resin is used in the peripheral area of the glass sheet to support the parts other than the peripheral area, and then a synthetic resin or its raw material that can be solidified is injected into the cavity space, and after the synthetic resin has solidified, the filled glass sheet is taken out from the mold. This is a method of forming moldings or gaskets made of plastic.

An example of the method of the present invention will first be explained using the drawings. FIG. 1 is a partial sectional view of a closed mold with a glass plate placed inside. The mold consists of an upper mold (+) and a lower mold (2).
) is located between the upper mold (1) and the lower mold (2).

The sealing members (4) and (5) are located between them and form a cavity space which will be described below. The peripheral part of the plate glass (3) consists of two peripheral surfaces (6), a lower peripheral surface (7), and an end surface (6), and the two peripheral surfaces (6) and the lower peripheral surface (7) are shown in [11], respectively. Let a and b be. As described later, there are cases where the molding is not formed on the entire peripheral area of the glass sheet, so the surface where the molding is formed in the peripheral area is called the molding forming surface, and the peripheral area of the glass sheet including the surface where the molding is not formed in the peripheral area is called the molding forming surface. The other surfaces will be referred to as non-molding surfaces.

Therefore, the upper peripheral surface (6), lower peripheral surface (7), and end surface (8) in the figure are molding forming surfaces, and the other surfaces (9) of the sheet glass
(In) is the non-molding surface. The mold inner surface surrounded by the inner surface (11) of the upper mold (1) that is not in contact with the non-mold forming surface, the inner surface (12) of the lower mold (2), and the mold forming surface of the sheet glass becomes a cavity space (13), In the case of reaction injection molding, the -1-lower mold parting line (I4) is placed in this space (13).
The synthetic resin raw material is injected through the injection hole provided in ). In other molding methods, injection holes are often provided in one mold.

The feature of the present invention is that the operating rod (1
5) to press one sealing member (5) to make the seal more complete, or to simultaneously or separately position the glass plate (3). The actuating rod (15) may also be a plate extending in the longitudinal direction of the sealing member (perpendicular to the plane of the paper). Furthermore, the other seal member (4) may be provided with an actuating rod, or both seal members may be provided with an actuating rod. In addition, if the purpose is only to position the glass plate (3), a similar actuating rod may be provided so as to contact a non-molding surface that is not contacted by the sealing members (4) (5) of the glass plate (3). .

1, the reason for using the operating rod (15) is to improve the sealing performance and the positioning accuracy of the glass sheet. That is,
First, by driving the operating rod, the pressure (sealing pressure) of the sealing member against the sheet glass can be freely adjusted. On the other hand, if there is no operating rod, a certain degree of sealing performance is achieved due to the elasticity of the sealing member, but it is difficult to change the sealing pressure by changing the elasticity. When the mold clamping pressure is increased to increase the sealing pressure, the pressure becomes too high and there is a greater possibility that the easily broken glass sheet will break. Second, by driving the operating rod, the glass sheet can be positioned accurately. If only the sealing member is used, the position of the glass plate is likely to change due to the sealing pressure and the elasticity of the sealing member. Accurate positioning of the glass sheet is important in order to deform a molding of a predetermined shape with respect to the glass sheet, and by using an actuating rod, even if the actuating rod is not in contact with the sealing member, it can be positioned on the non-molding surface of the glass sheet. This positioning can be performed even when they are in contact with each other.

As described above, the seal members (4) and (5) are provided to prevent the injected synthetic resin and its raw materials from leaking from the cavity space. Therefore, the sealing member must be able to exhibit sealing performance even if the position of the operating rod changes. The sealing member is usually placed on the inner surface of the mold in advance (=
It is preferable that the actuator be mounted on the tip of the actuating rod or integrally with the actuating rod.

In the former case, even if the position of the operating rod changes due to its elasticity, the sealing member and the inner surface of the mold must be sufficiently fixed. In the latter case, the operating rod must be in close contact with the mold and must be able to slide. Of course, these are not necessary if the operating rod is in contact with the non-molding surface of the glass plate (the part not in contact with the sealing member). Note that the sealing member does not necessarily need to be attached to the inner surface of the mold in advance, and may have a structure in which it can be fixed by compression between the sheet glass and the mold.

It is necessary that the molding formed covers at least the end face (8) of the glass sheet. However, if the molding and the glass plate are joined only to the end surface (8) of the glass plate, the bonding strength between the two tends to be insufficient, so preferably at least one of the upper peripheral surface (6) and the lower peripheral surface (7) of the glass sheet , more preferably both. Therefore, the cross-sectional shape of the molding is preferably U-shaped, which is the cross-sectional shape of the cavity space (I3) shown in the figure. The widths a and b of the upper peripheral surface (6) and the lower peripheral surface (7) may be different lengths or may be the same length. Further, the lengths a and b are not particularly limited, but it is preferable that both lengths are at least 1 mm.

As mentioned above, the molding can be formed not only on the entire peripheral part of the glass sheet, but also in a part of the peripheral part. For example, if we take a rectangular glass plate as an example, moldings can be formed not only on all four sides, but also on only one to three sides. Furthermore, only the four corners of the rectangular plate glass,
It is also possible to form a molding only on a part of the side. The cross-sectional shape of the molding is preferably J: U-shaped as described above.
Based on this, it is also possible to further provide unevenness on the surface, and to change the thickness and 111 of the three sides of the U-shape. As described below, in the reaction pultrusion molding method, the length of the molding becomes longer (i.e., the length of the cavity space becomes longer).
Even in such cases, it is possible to sufficiently spread the synthetic resin raw material throughout the cavity space by simply injecting the synthetic resin or its raw material from one injection hole. However, in some cases, when forming a molding around the entire circumference of a rectangular glass plate, it may be preferable to provide two or more injection holes, such as injection holes at the four corners. Figure 4 is a partial cross-sectional view of a sheet glass with a molding formed thereon, and the molding (17) is made from a synthetic resin formed by injecting a synthetic resin raw material into the cavity space (13) in Figure 1 and solidifying it. It has become.

Various types of glass plates can be used as the glass plate.

For example, it may be a simple flat glass, a processed glass sheet, or a reinforced glass sheet. Processed sheet glass includes, for example, sheet glass that has been bent, such as windshields, rear glass, and door glass for automobiles, and these may also be laminated glass with an interlayer film, and may be heat-treated or chemically treated. It may also be tempered glass strengthened by The glass sheet may also be a glass sheet for architectural construction or a glass sheet used for other purposes. Examples include architectural flat glass, double-layer glass, and template bj1 glass. In the present invention, even if the sheet glass has surface irregularities, it is possible to form a molding that tightly adheres to the surface of the sheet glass.

The surface of the sheet glass may also be subjected to various treatments. For example, heat ray reflective glass plated with sea urchin or ceramic coated may be used.

Apart from this, it may also be a plate glass that has been subjected to a preferable treatment to form a molded shape. For example, it is possible to use a glass plate coated with a brimer on the peripheral portion of the glass plate (mold forming surface) on which the molding is formed in order to improve the adhesive strength with the molding. Conversely, a removable protective coating can be applied to the non-molded surface after the molding is formed, or a removable film can be adhered thereto.

The material of the mold is not particularly limited, but may be made of metal or a so-called resin mold made of epoxy resin, polyester resin, or the like.

In the case of a mold made of a normal hard material such as a metal mold, it is preferable to protect the non-molding surface of the sheet glass with a protective material. It is preferable that this protective material is interposed not only in the contact portion with the sealing portion but also in other portions of the non-molding surface where there is a risk of damaging or destroying the sheet glass. The dimensional accuracy of the mold is preferably high so as not to apply strong force locally to the glass sheet, and it is also preferable that the dimensional accuracy of the glass sheet is similarly high.

Preferably, the mold is a temperature adjustable mold. In particular, it is preferable to be able to adjust the temperature of at least the mold portion in contact with the cavity space. This is because it is often necessary to control the assimilation of the solidifiable synthetic resin or its raw material injected into the cavity space. The degree of heating or cooling of the mold depends on the type of solidifying synthetic resin injected and its raw material. Usually, it is preferable to be able to heat up to about 150°C. Although the mold surface that is in contact with the non-molded surface of sheet glass often does not require particular temperature control, temperature control such as temperature control is necessary to prevent the intrusion of synthetic resins and their raw materials that can solidify into this area. In some cases, it may be preferable to do so. Further, it is preferable that at least the inner surface of the mold facing the cavity space is coated with a mold release agent. Although it is not necessary to apply a mold release agent to the inner surface of the mold that is in contact with the non-molding surface of the sheet glass, it is of course unlikely that it would be particularly inconvenient to do so.

The material of the sealing member is preferably an elastic body such as a synthetic resin elastomer or rubber, but is not limited to this, and may be a material having elasticity such as a soft synthetic resin or foamed synthetic resin. . It is preferable that these materials have at least elasticity. It is preferable that the parts of the sealing member that may come into contact with solidified synthetic resin or its raw materials be made of a material with a non-adhesive surface, but even if this is not the case, non-adhesive surfaces such as applying a mold release agent may be applied. A material with a surface formed thereon can be used. Specific materials include, for example, synthetic resins and synthetic rubbers with non-adhesive surfaces such as fluororesin, fluororubber, silicone resin, and silicone rubber, soft or semi-rigid polyurethane foam, and other foamed synthetic resins. A hollow body made of soft synthetic resin, a composite material such as resin-impregnated paper, etc. are preferable. In addition, relatively soft synthetic resins such as polyethylene, elastomers and rubbers other than those mentioned above may also be used. Further, as a protective material for protecting the non-molded surface of the sheet glass, it is not necessary to have sealing properties in particular, but it is possible to use an elastic body having the sealing properties listed in -h, or other synthetic resins. , elastomer, rubber, paint, film or sheet of paper, and various other materials can be used.

In the present invention, "solidifiable" in synthetic resins or raw materials thereof refers to those that can change from a fluid state to a non-fluid state, and in the case of synthetic resin raw materials, when it becomes a non-fluid state, it is a synthetic resin. means. In the case of thermoplastic resins, they become fluid when heated and melted, and become non-fluid when cooled. Thermosetting resins are liquid to solid in an uncured state, and solid ones become fluid when heated, and become non-fluid through so-called curing or crosslinking reactions. In addition, there are also synthetic resins in a non-fluid state by mixing and reacting solid synthetic resin raw materials that can be in a liquid to fluid state and consisting of two or more components. Solidification in the present invention refers to a change in the state in which the synthetic resin or its raw material injected into the cavity space with these fluids becomes a non-flowing state within the cavity space.

Classifying methods for forming synthetic resins, methods such as injection molding, transfer molding, reaction injection molding, and LIM can be used in the present invention. The most preferred method is the reaction injection molding method.

In the present invention, reaction injection molding (Rcacl; 1nnI
The injection molding method is a process in which multi-component fluid synthetic resin raw materials are mixed under pressure, the mixture is injected into a mold, and the synthetic resin raw material mixture is rapidly reacted in the mold to form a synthetic resin. A method for obtaining molded synthetic resin. This method is also called the rRIM method. The synthetic resin raw material is usually liquid, and may be in the form of a slurry of liquid containing solids such as fillers.

The method of reaction injection molding using synthetic resin raw materials mixed with reinforcing materials is sometimes called the "R-RIM method".
Hereinafter, this is assumed to be one type of reaction injection molding method.

In the reaction injection molding method, the synthetic resin raw material consists of a combination of two or more components. These components are combinations that react rapidly when mixed to form a synthetic resin. For example, the components that form a polyurethane resin include a combination of a compound having an active hydrogen-containing group such as a polyol and a polyisocyanate compound. . Particularly reactive high molecular weight polyols and chain extenders (or crosslinkers)
A polyol component whose main component is a polyisocyanate compound and an isocyanate component whose main component is a polyisocyanate compound are used. Highly reactive high molecular weight polyols include, for example, polyether polyols with a high proportion of primary hydroxyl groups, and chain extenders (or crosslinking agents) include low molecular weight polyols such as ethylene glycol and 1,4-butanediol. and low molecular weight polyamines. Examples of synthetic resin raw materials that can form synthetic resins other than polyurethane resins include caprolactams that can form nylon. For example, nylon can be produced by reaction injection molding using a combination of components containing caprolactams and a polymerization catalyst and components containing caprolactams and a polymerization promoter. In addition, synthetic resins such as epoxy resin 4 polyester resin and vinyl ester resin can be manufactured by reaction injection molding. In addition, fillers, reinforcing agents, tube coloring agents, blowing agents, catalysts, stabilizers, and other various additives can be added to the component containing the synthetic resin raw material described in 1.

In reaction injection molding, the two or more components are mixed at relatively high pressure and immediately injected into a cavity space. For example, a method is employed in which two components are ejected at high pressure from facing nozzles to cause collisional mixing, and the mixture is immediately injected into the cavity space at that pressure. Although the injection pressure in the reaction injection molding method is high, the pressure is usually 3
kg/cm" or less, which is much lower than the injection pressure normally employed in injection molding methods for molten synthetic resin. The mold may be heated or may be at room temperature. Especially , the mold part in contact with the cavity space is at room temperature ~
Preferably, it is heated to 100°C. Moreover, when molding a polyurethane resin, it is particularly preferable that it be heated to 40 to 70°C. The mixture of synthetic resin raw materials filled in the cavity space is solidified by increasing the molecular weight through the reaction, and becomes a synthetic resin. in this way,
In the reaction injection molding method, a low-viscosity synthetic resin raw material is mixed at relatively low pressure and high speed, and can be injected and filled into the cavity space in the mold. The mixture filled in the mold rapidly reacts and solidifies to form a synthetic resin molded product. For an overview of the reaction injection molding method, please refer to the magazine "Plastics" No. 28 published by Kogyo Kenkyukai Co., Ltd. Volume No. 4 (+977
), pages 27 to 31, and the same magazine, volume 29, issue 9 (
+9711) described on pages 13 to 24.

On the other hand, in the present invention, as a method of forming a molding around the periphery of a glass plate, a molten synthetic resin, molten rubber, or other molten synthetic resin material is placed in a cavity space of a closed mold by placing a glass plate by ordinary injection molding. It is also possible to use a method in which the resin is injected, cooled and solidified to form a molding around the glass plate. However, this method has various limitations during injection filling and cooling solidification due to the small cross-sectional area, long, and curved shape of the cavity space, and this method is difficult to apply to automobile windshields, rear windows, etc. It is difficult to apply to large glass sheets, and is applied to relatively small glass sheets. Furthermore, the molding can also be formed by injecting a thermosetting resin other than the molten synthetic resin. Similarly, transfer molding and LIM molding can be applied to relatively small glass plates. However, as a method other than reaction injection molding, the molding is preferably formed by injection molding of a molten thermoplastic resin.

The molten synthetic resin injected into the cavity is solidified by cooling. These synthetic resins contain customary fillers, reinforcing materials,
Other compounding agents may be added. As these synthetic resins, vinyl chloride resins, thermoplastic elastomers, thermoplastic rubbers, etc. are sometimes preferred. Examples of synthetic resins are listed below, but the synthetic resins that can be used in the present invention are not limited to these.

Thermoplastic resin: polyethylene, polypropylene, EVΔ
, other polyolefin resins, polystyrene, AS
%ABS, other polystyrene resins, polymethyl methacrylate, other acrylic resins, PET, PB
T, other polyester resins, nylon-6, nylon 66 and other polyamide resins, polycarbonate resins, polyurethane resins, polyacetal resins,
Polyarylene ether resin, polyvinyl halide resin, silicone resin, cellulose resin, or a blend thereof.

Thermoplastic rubber: Polyolefin type such as EPCM, styrene-butadiene type, styrene-isobutylene type, polyurethane type, polyester type, ethylene-vinyl acetate type, and other thermoplastic rubbers.

Thermosetting resins: unsaturated polyester resins, vinyl ester resins, epoxy resins, silicone resins, phenolic resins, diallyl phthalate resins.

Note that the distinction between moldings and gaskets used in the industry is generally not clear. In the present invention, gaskets are used for the purpose of sealing, and are made of elastic synthetic resins such as elastomers and thermoplastic rubbers. Molding refers to items used for decorative purposes, and refers to items made of synthetic resins such as elastomers and thermoplastic rubbers, as well as other thermoplastic resins and thermosetting resins.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a mold in which a glass plate is placed, showing an example of the method of the present invention, and FIG. 2 is a partial cross-sectional view of a glass plate with a molding formed thereon.

Claims (1)

[Claims] 1. A method for forming a molding or gasket made of synthetic resin around the periphery of a glass plate, which includes placing the glass plate in a mold and closing it, and providing a sealing member between the inner surface of the mold and the glass plate. A cavity space is formed which is surrounded by the peripheral surface of the sheet glass, the inner surface of the mold, and the surface of the sealing member and is used to form a molding or gasket, and the mold is further provided with an operating rod that can be driven from outside the mold to operate the mold. The sealing member or a portion of the glass sheet other than the peripheral portion is supported by a rod, then a synthetic resin or its raw material that can be solidified is injected into the cavity space, and after the synthetic resin has solidified, the glass sheet is taken out from the mold. A method of forming a synthetic resin molding or gasket around the periphery of the glass sheet. 2. The method according to claim 1, wherein the method of injecting the synthetic resin raw material into a mold and solidifying it is a reaction injection molding method.