JPH047979B2 - - Google Patents

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 by injecting a synthetic resin raw material into a mold in which a glass sheet is placed by a reaction injection molding method. The present invention relates to a method of forming a molding or gasket in a part.

BACKGROUND OF THE INVENTION Synthetic resin moldings and gaskets (hereinafter collectively referred to as moldings) are usually attached to the periphery of glass sheets for vehicles such as automobiles or glass sheets for construction for purposes such as decoration or sealing. 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 sheet glass. Further, it has been difficult to manufacture moldings having complicated shapes or moldings with uneven patterns formed on the surface 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 present inventor found a method in which a synthetic resin molding is directly molded around the glass sheet, thereby manufacturing a glass sheet with a synthetic resin molding attached in one step. I found out. In this method, molding of the synthetic resin molding and attachment to the peripheral area of the glass sheet 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 and complex shapes. The present invention is a method for manufacturing a sheet glass in which a synthetic resin molding is formed on the peripheral portion of the sheet glass by integral molding, that is, a method for forming a synthetic resin molding or gasket on the peripheral portion of the sheet glass.
A glass plate is placed in a mold having an operating rod that can be driven from outside the mold, the mold is closed, and a sealing member is provided between the inner surface of the mold and the glass plate to protect the peripheral surface of the glass plate, the inner surface of the mold, and the surface of the sealing member. forming a cavity space surrounded by and for forming a molding or gasket, and supporting a portion other than the periphery of the sealing member or sheet glass by adjusting the pressure thereon by the operating rod, and then solidifying in the cavity space. This is a method for forming a molding or gasket made of synthetic resin around the periphery of a glass sheet, which is characterized by injecting a synthetic resin or its raw material into a mold, and removing the glass sheet from the mold after the synthetic resin has solidified.

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 1 and a lower mold 2, and a glass plate 3 is located between the upper mold 1 and the lower mold 2. The seal members 4 and 5 are located between them and form a cavity space which will be described later. plate glass 3
The peripheral parts are the peripheral upper surface 6, the peripheral lower surface 7 and the end surface 6.
The widths of the upper peripheral surface 6 and the lower peripheral surface 7 are respectively a and b as shown in the figure. 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, the lower peripheral surface 7, and the end surface 8 in the figure are the molding-forming surfaces, and the other surfaces 9 and 10 of the sheet glass are the non-moulding-forming surfaces. The mold inner surface surrounded by the inner surface 11 of the upper mold 1 that is not in contact with the non-molding surface, the inner surface 12 of the lower mold 2, and the molding forming surface of the sheet glass is the cavity space 1.
3, and in the case of reaction injection molding, the synthetic resin raw material is injected into this space 13 through the injection hole provided at the dividing line 14 of the upper and lower molds. In other molding methods, injection holes are often provided in one mold.

A feature of the present invention is that one of the sealing members 5 is held down by an operating rod 15 that can be driven by external hydraulic pressure or the like, thereby making the seal more complete, or simultaneously or separately positioning the glass plate 3. The actuating rod 15 may also be a plate extending in the length direction of the sealing member (in the direction perpendicular to the plane of the drawing). moreover,
The other seal member 4 may be provided with an actuating rod, or both seal members may be provided with an actuating rod. Further, when the purpose is only to position the glass plate 3, a similar operating rod can be provided so as to contact a non-molding surface of the glass plate 3 that the seal members 4, 5 do not contact.

As mentioned above, 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 of all, the pressing force (sealing pressure) of the sealing member against the glass plate can be freely adjusted by driving the operating rod. 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
Furthermore, by driving the operating rod, the sheet glass can be positioned accurately. If only the sealing member is used, the position of the glass sheet 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 sheet glass, 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. It is preferable that the sealing member is normally attached in advance to the inner surface of the mold or attached to the tip of the operating rod integrally with the operating 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,
If the operating rod is in contact with a non-seal forming surface of the sheet glass (a portion not in contact with the seal member), there is little need for these. 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 that allows it to be fixed by compression between the sheet glass and the mold.

The molding formed is at least on the end surface 8 of the sheet glass.
It is necessary to cover the However, if the molding and the glass plate are bonded only to the end surface 8 of the glass plate, the bonding strength between the two tends to be insufficient, so it is preferable that the molding and the glass plate be bonded to at least one of the upper peripheral surface 6 and the lower peripheral surface 7 of the glass sheet, and more preferably to both. let Therefore, the cross-sectional shape of the molding is preferably U-shaped, which is the cross-sectional shape of the cavity space 13 shown in the figure. Width a, b of peripheral upper surface 6 and peripheral lower surface 7
may have different lengths or the same length. Moreover, although the lengths a and b are not particularly limited, 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, it is also possible to form moldings only on the four corners or only on part of the sides of a rectangular sheet of glass. The cross-sectional shape of the molding is preferably U-shaped as described above, but
Based on this, we further created irregularities on the surface,
It is also possible to change the thickness and width of the three sides of the U-shape. As described below, in the reaction injection molding method,
Even if the length of the molding becomes long (that is, the length of the cavity space becomes long), the synthetic resin raw material can be sufficiently filled into the entire cavity space by simply injecting the synthetic resin or its raw material from one injection hole. It is possible to spread it. 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. FIG. 4 is a partial sectional view of a glass plate on which a molding is formed, and the molding 17 is made of a synthetic resin formed by injecting a synthetic resin raw material into the cavity space 13 of FIG. 1 and solidifying it.

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, bent sheet glass 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 a tempered glass reinforced by. The glass sheet may also be a glass sheet for architectural construction or a glass sheet used for other applications. Examples include architectural flat glass, double-layer glass, and molded glass. In the present invention, it is possible to form a molding that tightly adheres to the surface of sheet glass, such as sheet glass, which has an uneven surface.

The surface of the glass sheet may also be subjected to various treatments. For example, it may be plated with heat ray reflective glass or coated with ceramics. Alternatively, it may be a sheet glass that has undergone a suitable treatment to form the molding. For example, it is possible to use a glass plate coated with a primer on the periphery of the glass plate where the molding is formed (mold forming surface) in order to improve the adhesive strength with the molding. Conversely, a removable protective coating can be applied to the non-molded surface after molding is formed, or a removable film can be adhered to the surface.

The material of the mold is not particularly limited, but may be a metal mold 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 glass sheet. 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 that the temperature of at least the part of the mold in contact with the cavity space can be adjusted. This is because it is often necessary to control the solidification 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. It is usually 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 more elasticity than the material of the mold. 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 fluorocarbon resins, fluorocarbon rubbers, silicone resins, and silicone rubber; soft or semi-rigid polyurethane foams 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. In addition, as a protective material for protecting the non-molded surface of the sheet glass, sealing properties are not particularly required, but
Of course, it is possible to use the above-mentioned elastic body having sealing properties, but also other synthetic resins, elastomers,
Films and sheets of rubber, paint, paper, and other various 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 non-fluid 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 (Reaction injection molding)
The Injection Molding method is a method in which a multi-component fluid synthetic resin raw material is 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 the "RIM method"
Also called. The synthetic resin raw material is usually a liquid, and may be in the form of a slurry of liquid containing solids such as fillers. A method of reaction injection molding using a synthetic resin raw material blended with a reinforcing agent is sometimes referred to as the "R-RIM method," and hereinafter this will be considered to be one type of reaction injection molding method.

In the reaction injection molding method, the synthetic resin raw material is 2
It consists of a combination of the above ingredients. 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. . In particular, a polyol component whose main components are a highly reactive high molecular weight polyol and a chain extender (or crosslinking agent), and a polyisocyanate 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 a component containing caprolactams and a polymerization catalyst and a component containing caprolactams and a polymerization promoter. In addition, synthetic resins such as epoxy resins, polyester resins, and vinyl ester resins can be manufactured by reaction injection molding. In addition, the ingredients containing the above synthetic resin raw materials include fillers, reinforcing agents, coloring agents,
Foaming agents, catalysts, stabilizers, and other various additives can be added.

In reaction injection molding, the two or more components are mixed at relatively high pressure and immediately injected into the cavity space. For example, a method is employed in which two components are ejected at high pressure from facing nozzles to mix them by collision, 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, it is usually about 3 kg/cm ² or less, which is much lower than the injection pressure normally employed in the injection molding method for molten synthetic resin. The mold may be heated or at room temperature. In particular, it is preferable that the mold portion in contact with the cavity space be heated to room temperature to 100°C.
In addition, when molding polyurethane resin, especially
Preferably, it is heated to 40 to 70°C. The mixture of synthetic resin raw materials filled in the cavity space is solidified into a synthetic resin by increasing its molecular weight through these reactions. In this way, the reaction injection molding method uses a low-viscosity synthetic resin raw material, mixes it at relatively low pressure and high speed, and injects it into the cavity space in the mold to fill it. 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, for example, see the magazine "Plastics" published by Kogyo Research Association Co., Ltd.
28, No. 4 (1977), pages 27 to 31, and the same magazine, Vol. 29, No. 9 (1978), pages 13 to 24.

On the other hand, in the present invention, as a method for 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 in which the glass plate is placed, using a normal injection molding method. 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 in injection filling and cooling solidification due to the small cross-sectional area, long, and curved shape of the cavity space, and it is difficult to use this method for large-scale applications such as the front and rear windows of automobiles. It is difficult to apply this method to glass sheets of relatively small size. moreover,
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. 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 solidifies as it cools. These synthetic resins can be blended with customary fillers, reinforcing materials, and other compounding agents. As these synthetic resins, vinyl chloride resins, thermoplastic elastomers, thermoplastic rubbers, etc. are sometimes preferred. Examples of synthetic resins are listed below, but the invention is not limited to only these synthetic resins that can be used.

Thermoplastic resin: polyethylene, polypropylene, EVA, other polyolefin resins,
Polystyrene, AS, ABS, other polystyrene resins, polymethyl methacrylate,
Other acrylic resins, PET, PBT, other polyester resins, nylon-6,
Nylon 66 and other polyamide resins, polycarbonate resins, polyurethane resins,
Polyacetal resin, polyarylene ether resin, polyhalogenated vinyl resin,
Silicone resin, cellulose resin, or a blend thereof.

Thermoplastic rubber: polyolefin type such as EPDM, 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 resin such as elastomer or thermoplastic rubber. Molding refers to items used for decorative purposes, and refers to items made of synthetic resins such as elastomers, thermoplastic rubbers, other thermoplastic resins, and thermosetting resins.

[Brief explanation of drawings]

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. 1... Upper mold, 2... Lower mold, 3... Sheet glass, 13... Cavity space, 15... Operating rod.

Claims (1)

[Claims] 1. 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 having an operating rod that can be driven from outside the mold, the mold is closed, and the inner surface of the mold is closed. A seal member is provided between the glass plate and the cavity space surrounded by the peripheral surface of the glass plate, the inner surface of the mold, and the surface of the seal member for forming a molding or gasket, and the actuating rod is used to close the seal member. Supporting parts other than the peripheral parts of the member or glass plate by adjusting the pressure thereon, then injecting a synthetic resin or its raw material that can be solidified into the cavity space, and removing the glass plate from the mold after the synthetic resin has solidified. A method of forming a synthetic resin molding or gasket around the periphery of a sheet glass, characterized by: 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.