JPS6367124A - Method for forming molding or gasket - Google Patents

Abstract

PURPOSE:To easily form a molding, which is excellent in decorativeness and has a complicated shape, by a method wherein synthetic resin is formed at the peripheral part of a plate glass by arranging the plate lass within a mold under the existence of sealing members. CONSTITUTION:Sealing members 3 and 4 are attached onto the inner surfaces of a top force 1 and of a bottom force 2. A plate glass 5 is located between the top force 1 and the bottom force 2 and comes into contact with the sealing members 3 and 4. the peripheral top surface of the plate glass 5, its peripheral undersurface 7 and its end surface 8 are molding-forming surfaces. The other surfaces 9 and 10 are non-molding-forming surfaces. In the space 15 of a cavity formed by surrounding by the inner surface 11 of the top force 1, the inner surface 12 of the bottom force 2, the sealing members 13 and 14 and the molding-forming surfaces of the plate glass, raw synthetic resin material is poured through a pourer provided in the parting line 16 of the top and the bottom forces. A molding 17 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.

It is possible to attach a molding or gasket made of synthetic resin (hereinafter collectively referred to as molding) to place decorations or stickers on the periphery of sheet glass for vehicles such as automobiles or sheet glass for construction. Usually done. 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, etc. However, this conventional method is complicated and not economical because it requires molding in advance and attachment to the sheet glass. 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, the molding of the synthetic resin molding and the attachment/attachment to the periphery 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 periphery of the glass by integral molding, that is, a method of forming a synthetic resin molding or a gasket on the periphery of the glass. The mold is closed to form a cavity space that forms a molding or gasket surrounded by the peripheral surface of the sheet glass, the surface of the sealing member, and the inner surface of the mold. A synthetic resin raw material is injected into the cavity space by an injection molding method and solidified, and after the synthetic resin has solidified, the filled glass sheet is taken out from the mold.A synthetic resin molding or gasket is formed around the glass sheet. It's a method.

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), each of which has seal members (3) and (4) attached to its inner surface. The plate glass (5) is located between the upper mold (1) and the lower mold (2) and is in contact with the seal members (3) and (4). The peripheral parts of the plate glass (5) are the upper peripheral surface (6) and the lower peripheral surface (7).
J: consists of an end face (8), and 11 of the peripheral upper surface (6) and peripheral lower surface (7) are designated as a and b, respectively, 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 peripheral upper surface (6), peripheral lower surface (7), and end surface (8) in the figure are molding forming surfaces, and the other surfaces of the sheet glass (91 (In) are non-molding forming surfaces. Upper mold not in contact with the surface (+1 inner surface (1
1), the inner surface (12) of the lower mold (2), and the sealing member (
+31 (+41 and the inner surface of the mold surrounded by the molding surface of the sheet glass becomes a cavity space (+5), and the synthetic resin is poured into this space (15) through the injection hole provided at the dividing line (16) of the upper and lower molds. Raw materials are injected.

In the present invention, the sealing members (3) and (4) are made of synthetic resin raw material injected into the cavity space (15) at the contact area between the sealing member (3) (41 and the glass plate (5) and the upper mold (
1) Used to prevent leakage from the contact area with the lower mold (2). It is preferable that the seal members (3) and (4) are attached to the upper mold (1) and the lower mold (2) in advance, respectively. The sealing member (J) can be attached to the inner surface of the mold in advance so as to be removable (NJ). By doing this, the problem of leakage at the contact area between the sealing member (3) (4) and the inner surface of the mold is almost eliminated. Of course, the sealing members (3) and (4) may be attached in advance to the non-molding surface of the glass plate by adhesive or the like, and can be fixed by compression of both the glass plate and the inner surface of the mold without being attached to them in advance. However, the former requires work to remove the sealing member from the sheet glass after forming the molding, and the latter does not make it easy to control the position of the sealing member. It is most preferable that the sealing member is pre-attached to the glass plate.Hereinafter, the sealing member is mainly used for sealing the portion that comes into contact with the surface of the glass sheet.

The sealing member is in close contact with the surface of the glass plate and prevents the synthetic resin raw material in the cavity space from leaking along the surface. Therefore, part or all of the sealing member must have elasticity, and usually at least the portion that contacts the sheet glass is made of an elastic material such as elastomer or rubber.

In order to achieve sufficient sealing performance, it is preferable that the contact area between the sealing member and the sheet glass be wide. Therefore, the contact area is usually in the form of a wide band. As discussed below, the reactive raw material mixture has a low viscosity and is prone to leakage, whereas the relatively low internal pressure in the cavity space means that there is little risk of leakage. For this reason, the sealing pressure of the sealing member against the surface of the glass plate is relatively low, and there is little risk of damage to the glass plate due to this sealing pressure.

The molding needs to cover at least the end face (8) of the glass sheet. 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 to
) and the lower peripheral surface (7), preferably both. Therefore, it is preferable that the cross-sectional shape of the molding is a box-shaped cross-section, which is the cross-sectional shape of the cavity space (15) shown in the figure. Upper peripheral surface (6) and lower peripheral surface (7
) may have different lengths or 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 zigzag pattern only on a part of the side. The cross-sectional shape of the molding is preferably U-shaped as shown in 1.
Based on this, it is also possible to create irregularities on the surface, or to change the thickness of the three sides of the U-shape. However, by injecting the synthetic resin raw material from one injection hole, it is possible to sufficiently spread the synthetic resin raw material throughout the cavity space (even if the length of the cavity space becomes long). 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 2 shows a partial cross section of a glass plate with a molding formed thereon. The molding (17) shown in FIG. 1 is made of a synthetic resin formed by injecting a synthetic resin raw material into the cavity space (15) shown in FIG. 1 and then assimilating 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 brimer on the peripheral portion of the glass plate on which the molding is formed (mold forming surface) in order to improve the adhesive strength with the glass. 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 a metal mold or a so-called resin mold made of epoxy resin, polyester resin, or the like.

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 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 it 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. Furthermore, it is preferable that a mold release agent be applied to the inner surface of the mold facing at least the cavity] 1 space. 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 thereto, and may include a soft synthetic resin or a foamed synthetic resin having elasticity. You can. These are made of materials that are at least more elastic than the material of the mold. It is preferable that the end face of the sealing member that comes into contact with or may come into contact with the synthetic resin raw material that can be solidified and the part that comes into contact with the sheet glass is made of a material with a non-adhesive surface, but even if this is not the case, a release agent should be applied. A material with a non-adhesive surface 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, 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 listed in 1 can also be used.

In the present invention, reaction injection molding (ReactionInjection molding)
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 17R-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. . In particular, a polyol component whose main components are a highly reactive high molecular weight polyol and a chain extension agent (or crosslinking agent), and an isocyanate component whose main component is a polyisocyanate compound are used. Examples of highly reactive high molecular weight polyols include polyneedle polyols with a high proportion of primary hydroxyl groups, while chain extenders (or crosslinking agents) include low molecular weight polyols such as ethylene glycol and 1,4-butanediol. These include polyols and low molecular weight polyamines. Examples of synthetic resin raw materials that can form synthetic resins other than polyurethane resin include caprolacta 1, which can form nylon.
There is one type. For example, Liiron can be produced by reaction q-1 injection molding using a combination of a component containing caprolactams and a 1-coupling catalyst and a component containing caprolactam and a 1-coupling promoter. It is possible to produce synthetic resins such as epoxy resins, polyester resins, and vinyl ester resins.
Fillers, reinforcing agents, colorants, 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 above 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, it is usually less than about 3 kg/cm", which is much lower than the injection pressure normally employed in the injection molding method of 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 I'QO°C.
When molding polyurethane resin, especially at 40 to 70℃.
Preferably, the temperature is heated to . 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 [977] 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,
There is a method in which molten synthetic resin, molten rubber, or other molten synthetic resin material is injected into the cavity space of a closed mold with a glass plate placed therein using a normal injection molding method, and then cooled and solidified to form a molding around the glass plate. be. However, this method has various limitations during injection filling and cooling assimilation 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.

However, 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 to prevent the injected material from cooling and solidifying midway through the cavity space. For this reason, injection filling takes time and cooling and assimilation 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. This is because the viscosity of the material to be injected is low, which allows the material to 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 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. In addition, mechanical and thermal shocks to the glass plate are small, and there is little risk of breakage of the glass plate.

Although the term "molding" is used in the present invention to include the above-mentioned gasket, 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. It's okay.

[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. 1... Upper mold 2... Lower mold 3.4... Seal member 5... Plate glass 15... Cavity space No. ? town

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 in which a sealing member is provided, the mold is closed, and the peripheral surface of the glass sheet is , a cavity space for forming a molding or gasket is formed surrounded by the surface of the sealing member and the inner surface of the mold, and then synthetic resin raw material is injected into the cavity space by reaction injection molding method and solidified to form a synthetic resin. A method for forming a molding or gasket made of synthetic resin around the periphery of a glass plate, which comprises removing the glass plate from the mold after solidification. 2. The method according to claim 1, wherein the sealing member is attached to the inner surface of the mold in advance. 3. Claim 1, in which the sealing member is made of an elastic body
Section method. 4. 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.