JPS6367128A - Method for forming molding of 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. CONSTITUTION:A plate glass 3 is located between a top force 1 and a bottom force 2. The peripheral top surface 4 of the plate glass 3, its peripheral undersurface 5 and its end surfaces 6 are molding-forming surfaces. The other surfaces 7 and 8 are non-molding-forming surfaces. A cavity space 11 is the interior of the mold surrounded by the inner surface 9 of the top force 1, the inner surface 10 of the bottom force 2 and the molding-forming surfaces of the plate glass. Raw synthetic resin material is poured through a pourer provided in the parting line 12 of the top and the bottom forces in the space 11. 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.

Plastic moldings and gaskets (hereinafter both are collectively referred to as moldings) are used to decorate or seal the peripheral parts of sheet glass for vehicles such as automobiles or architectural glass sheets.

) is normally conducted. This synthetic resin molding is usually attached to a glass sheet using a method in which a pre-formed molding is used and the molding is attached to the periphery of the glass sheet by means such as gluing or fitting. However, this conventional method is complicated because it is necessary to mold the molding in advance and requires one piece of work to remove the glass sheet, and is not economical enough. Furthermore, it is 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 examining various methods for attaching synthetic resin moldings to sheet glass, the inventors of the present invention have determined that synthetic resin moldings can be directly molded around the glass sheet using a reaction injection molding method, thereby attaching synthetic resin moldings. We have discovered a method for manufacturing sheet glass in one step. 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 glass sheet by integral molding, that is, a method of forming a synthetic resin molding or a gasket on the peripheral portion of the sheet glass, in which the sheet glass is placed in a mold. , the mold is closed, a cavity space is formed around the entire circumference of the glass sheet by the peripheral surface of the glass sheet and the inner surface of the mold, and then a synthetic resin raw material is injected into the cavity space using a reaction injection molding method and solidified. This is a method of forming a molding or gasket made of synthetic resin around the periphery of a glass sheet, which is characterized by removing the glass sheet from the mold after the 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).
) is located between the upper mold (1) and the lower mold (2).

The peripheral area of the plate glass (3) is the peripheral upper surface (4) and the peripheral lower surface (5).
) and an end surface (6), and the widths of the upper peripheral surface (4) and lower peripheral surface (5) are respectively a and b as shown.

As will be described later, in the present invention, molding is formed on the entire peripheral area of the sheet glass, so the entire peripheral area where the molding is formed is called the molding forming surface, and the surface other than the peripheral area of the sheet glass is called the non-molding forming surface. I'll decide. Therefore, the upper peripheral surface (4), lower peripheral surface (5), and end surface (6) in the figure are the molding forming surfaces (existing around the entire circumference of the glass sheet (3)), and the other surfaces (7) (8) of the glass sheet is the non-moulding surface. The mold inner surface surrounded by the inner surface (8) of the upper mold (1) that is not in contact with the non-mold forming surface, the inner surface (10) of the lower mold (2), and the mold forming surface of the sheet glass becomes a cavity space (11), A synthetic resin raw material is injected into this space (11) through an injection hole provided at a dividing line (12) between the upper and lower molds.

In Figure 1, the non-molded surface (7) of the glass plate (3) is shown.
) It is undesirable that the synthetic resin raw material enters the contact surfaces between (8) and the upper mold (1) and lower mold (2) from the cavity space (11). Therefore, it is preferable to adopt a method of sealing this part. One method is to combine the non-molding surface (7) (8) of the sheet glass (3) with the upper mold (1).
) and/or a method in which an elastic body having sealing properties is present on the contact surface with the lower die (2). This elastic body may be a thin film or relatively thick.

Furthermore, this elastic body may be attached in advance to the inner surface of the mold, or may be attached to the non-molding surface of the glass plate by adhesive or the like. Of course, it does not have to be attached to both in advance, but may be fixed by compression between the sheet glass and the mold. The elastic body having this sealing property can be present over the entire non-molding surface, but it is often sufficient to have only the portion in contact with the cavity space.

FIG. 2 is a partial cross-sectional view of a closed mold with a glass plate placed inside, similar to FIG. 1, and shows an example in which the elastic body having the above-mentioned sealing properties is used. The same parts as in Figure 1 are indicated by the same numbers. Elastic body with sealing properties (13) (14)
are the non-molding surface (7) and (8) of the sheet glass (3), respectively.
) is provided with a width that can achieve sealing performance only in the portion that contacts the cavity space (11). Both elastic bodies (13
) (14) also has the role of holding the glass plate (3) in the mold. The non-molding surface of the glass plate that is not in contact with the elastic bodies (7) and (8) may be in contact with the mold, but it can also be made not to contact the mold as shown in FIG.

FIG. 3 is a partial sectional view similar to FIGS. 1 and 2 for explaining yet another embodiment of the present invention, and the same parts as in FIGS. 1 and 2 are designated by the same numbers. The feature of this is that the operating rod (15), which can be driven by external hydraulic pressure, holds down the elastic body (14) that has sealing properties, making the seal more complete, and in some cases also positioning the glass plate (3). It is in. The actuation rod (15) may also be a plate extending in the length direction of the elastic body (in the direction perpendicular to the plane of the paper). Further, the actuating rod may be provided on the elastic body (14) having other sealing properties, or may be provided on both elastic body portions. In addition, if the purpose is only to position the glass plate (3), use a similar operating rod to move the elastic body (13) of the glass plate (3) (
14) may also be provided in contact with non-molding surfaces that are not contacted.

The molding needs to cover at least the entire circumference of the end face (6) of the glass plate. However, if the molding and the glass plate are joined only to the end surface (6) of the glass plate, the bonding strength between the two tends to be insufficient, so preferably at least one of the upper peripheral surface (4) and the lower peripheral surface (5) 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 (11) shown in the figure. The widths a and b of the periphery surface (4) and the lower periphery surface (5) may be different lengths or may be the same length. Also, a.

Although the length of b is not particularly limited, both are preferably at least 1 mm.

As described above, the molding is formed all over the peripheral portion of the glass sheet. For example, if we take a rectangular glass plate as an example, moldings are formed around all four sides of the glass. The cross-sectional shape of the molding is preferably U-shaped as shown in the figure, but based on this, it is also possible to further provide unevenness on the surface or 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 (i.e., the glass sheet becomes larger and the length of the cavity space becomes longer), the synthetic resin raw material can be injected from a single injection hole. By just doing this, it is possible to sufficiently spread the synthetic resin raw material into all the cavity spaces. However, depending on the case, it may be preferable to provide two or more injection holes, such as providing 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 (16) is shown in Figure 1 or 2.
It is made of a synthetic resin that is formed by injecting a synthetic resin raw material into the cavity space (11) shown in the figure and then 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, 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 molded glass. According to the present invention, even if the sheet glass has an uneven surface, such as molded glass, a molding can be formed in close contact with the surface of the sheet glass.

The surface of the sheet glass may also be subjected to various treatments. For example, it may be plated with heat ray reflective glass or coated with ceramics. Apart from this, it may also be a sheet glass that has been subjected to a preferable treatment to form a molding. For example, it is possible to use a glass plate coated with a primer 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. Similarly, a paint serving as a sealing elastic body may be applied to the portion of the non-molding surface that is in contact with the molding forming surface, or a sealing elastic body may be adhered thereto.

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 relatively soft resin mold, there is less risk of damaging or breaking the glass plate when it is pressed, and as long as it has sealing properties, it is not necessary to use the elastic body with the above-mentioned sealing properties. However, in the case of a mold made of a hard material such as a metal mold, it is preferable to interpose an elastic body in the contact portion with the sheet glass. It is preferable that this elastic body is interposed not only in the part having a sealing property but also in other contact parts 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 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 solidification of the solidifiable synthetic resin raw material injected into the cavity space. The degree of heating or cooling of the mold depends on the type of solidified synthetic resin raw material being poured. Usually, it is preferable to be able to heat up to about 150°C. The surface of the mold that is in contact with the non-molded surface of sheet glass often does not require particular temperature control, but it is necessary to adjust the temperature to prevent the intrusion of synthetic resin raw materials that can solidify into this area. may be preferable. 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 elastic body having sealing properties is preferably a synthetic resin, a synthetic resin elastomer, rubber, etc., but is not limited to these materials. There may be. 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 elastic body with sealing properties that may come into contact with the solidified synthetic resin raw material be made of a material with a non-adhesive surface, but even if this is not the case, preventive measures such as applying a mold release agent may be applied. A material with an adhesive surface may be used. Specific materials include, for example, synthetic resins and synthetic rubbers with non-adhesive surfaces such as fluororesin, fluororubber, silicone resin, silicone rubber, soft or semi-rigid polyurethane foam and other foamed synthetic resins, and relatively soft A hollow body made of 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 the elastic body for protecting the non-molded surface of the sheet glass, it is not particularly necessary to have a sealing property, but it is possible to use an elastic body having the above-mentioned sealing property, as well as other synthetic resins, elastomers, etc. , rubber, paint, film or sheet of paper, and various other materials can be used.

In the present invention, reaction injection molding (ReactionInjection molding)
The injection molding method is a method in which a multi-component fluid synthetic resin raw material is mixed under pressure and 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.

A method of reaction injection molding using a synthetic resin raw material blended with a reinforcing material is sometimes referred to as the "rR-RIM method", but hereinafter this is considered 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 in such a combination that when mixed, they react rapidly to form a synthetic resin.
For example, the components forming the polyurethane resin are a combination of a compound having an active hydrogen-containing group such as a polyol and a polyisocyanate compound. In particular, a polyol component containing a highly reactive high molecular weight polyol and a chain extender (or crosslinking agent) and an isocyanate component containing a polyisocyanate compound as a main component 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 form synthetic resins other than polyurethane resins include, for example, caprolactams that 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. Other synthetic resins such as epoxy resins, polyester resins, and vinyl Nisder resins can be produced by reaction injection molding. In addition, fillers, reinforcing agents, colorants, blowing agents, catalysts, stabilizers, and other various additives can be used in 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/am2 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 at room temperature. In particular, the mold part in contact with the cavity space is at room temperature
Preferably, it is heated to 00°C. Moreover, when molding a polyurethane resin, it is particularly preferable to heat it to 40 to 70'O. 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, 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 space rapidly reacts and solidifies to form a synthetic resin molding. For an overview of the reaction injection molding method, see, for example, the magazine "Plastics", Vol. 28, No. 4 (197?) published by Kogyo Research Association Co., Ltd.
Pages 27 to 31, and the same magazine, Vol. 29, No. 9 (1
978) described on pages 13 to 24.

On the other hand, as a method of forming a molding around the periphery of sheet glass,
A method of injecting molten synthetic resin, molten rubber, or other molten R&resin materials into the cavity space of a closed mold with a glass plate placed therein using a normal injection molding method, cooling and solidifying the material to form a molding around the glass plate. There is. 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 the fact that there is a plate glass in the mold that cannot be broken. There are restrictions based on the existence of materials that are easy to use. For example, due to the shape of the cavity space and the high viscosity material being injected, it is likely to be difficult to sufficiently fill every corner of the cavity space with the material.

To solve this problem, the injection pressure needs to be extremely high, and the temperature of the material needs to be raised to lower the viscosity. Furthermore, it is necessary to raise the mold temperature so that the injected material does not cool and solidify midway through the cavity space. For this reason, injection filling takes time and cooling and solidification of the material after filling also takes time, resulting in a longer molding time.

Furthermore, since the injection pressure is high, the internal pressure in the cavity space increases, making it difficult to seal the portion where the mold and the glass plate contact each other, and material tends to leak from the sealed portion. on the other hand,
In order to withstand the internal pressure of the cavity space, it becomes necessary to increase the mold clamping pressure. This increases the contact pressure between the mold and the glass sheet, increasing the risk of breaking the glass sheet. Also,
Since the temperatures of the injected material and the mold are high, the glass sheet receives a large thermal shock, which increases the possibility that the glass sheet will break due to this thermal shock.

In the present invention, there is little possibility that the above problem will occur. Because the viscosity of the injected material is low, the material can be injected at high speed and with relatively low injection pressure, and because there are fewer restrictions due to the shape of the cavity space, it is possible to fill every corner of the space with the material. This is because it is easy. Also, due to the rapid injection filling and reaction solidification of the material, the molding time is extremely short. Furthermore, there is little mechanical and thermal shock to the glass sheet, and there is little risk of breaking the glass sheet.

Although the term "molding" is used in the present invention to include gaskets as described above, it cannot be said that the method of the present invention is particularly suitable for forming moldings.

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 materials used for decorative purposes, and refers to materials made of synthetic resins such as elastomers and thermoplastic rubbers, as well as other thermoplastic resins and thermosetting resins, and are materials with low elasticity. You can.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a mold in which sheet glass is arranged, showing one example of the method of the present invention, and FIG. 2 is a similar partial cross-sectional view showing another example. FIG. 3 is a partial cross-sectional view of a glass plate on which a molding is formed. FIG. 4 is a partial cross-sectional view of a glass plate on which a molding is formed. 1... Upper mold 2... Lower mold 3... Sheet glass 11... Cavity space 1
3.14...Sealing elastic body 14...Mold 1 ll ri hα σ 3rd
Figure 4

Claims (1)

[Claims] 1. In a method of forming a synthetic resin molding or gasket around the peripheral part of a glass sheet, the glass sheet is placed in a mold, the mold is closed, and the molding or gasket is formed on the peripheral surface of the glass sheet and the inner surface of the mold. A cavity space for forming a gasket is formed around the entire circumference of the sheet glass, and then a synthetic resin raw material is injected into the cavity space and solidified by reaction injection molding, and after the synthetic resin is solidified, the sheet glass is molded into the mold. A method of forming a molding or gasket made of synthetic resin around the periphery of a sheet glass, which is characterized by being removed from the glass plate. 2. The method according to claim 1, wherein the synthetic resin raw material is a mixture of reactive raw materials capable of forming a polyurethane resin.