JP2503539B2 - Method for manufacturing window glass with gasket - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a window glass with a gasket, which is suitable for an automobile window glass or a building window glass.

"Prior art and its problems" Gaskets and moldings made of rubber or synthetic resin for the purpose of decoration or sealing around window glass for vehicles such as automobiles or architectural window glass (both are collectively referred to as gaskets below) Attaching is usually done.

Conventionally, the gasket is attached to the window glass by a method of adhering or fitting a gasket previously formed by extrusion molding or the like to the peripheral portion of the window glass. However, this method is not economical because it has a large number of steps and a large number of manpower.

Therefore, in order to solve this problem, in recent years, a method of manufacturing a windowpane with a gasket has been proposed in which the gasket is integrally formed on the peripheral edge of the windowpane. An example of this manufacturing method will be described with reference to FIG.
, So that it is sandwiched between the upper mold 12 and the lower mold 13 of the mold 11,
It is placed in the mold 11. As a result, the upper mold 12 and the lower mold 13
A cavity space 14 forming a gasket is formed between the inner surface of the glass and the peripheral portion of the window glass G. The upper mold 12
And the window glass G of the lower mold 13 is in contact with the window glass G.
Elastic plates 15 and 16 are attached to prevent damage to the surface of the. In this state, a gasket material such as a melt of rubber or elastomer or a raw material mixture capable of forming rubber or elastomer is injected into the cavity space 14, and the gasket material is solidified, so that the gasket is attached to the peripheral edge of the window glass G. Mold integrally. After that, upper mold 12 and lower mold 13
Open and take out the window glass G and the molded gasket from the mold 11. Incidentally, examples of such a manufacturing method include, for example, JP-A-57-158481 and JP-A-58-73.
681, JP-A-58-110786, JP-A-60-4015
JP-A No. 60-104412, JP-A No. 60-63115, JP-A No. 61-79613, and JP-A No. 61-66645.

However, the method for manufacturing a window glass with a gasket as described above has a problem that the gasket material easily enters the contact surface between the window glass G and the mold 11 during injection, and burrs are easily generated. Therefore, it is necessary to increase the mold clamping pressure to seal the contact surface. However, if the mold clamping pressure is increased, the molding die 11, the elastic plates 15 and 16, the window glass G, and the like have uneven shapes. The stress is likely to be concentrated on the window glass G, so that the window glass G in the molding die 11 is easily damaged. The damage due to the stress is particularly likely to occur in the window glass G that is bent into a complicated shape or deep-bent (bent with a small radius of curvature or a large bending angle). In many cases, the accuracy of curvature of the bent window glass G is insufficient, and it is considered that the unevenness of the shape of the window glass G also causes the damage.

“Object of the Invention” An object of the present invention is to provide a method for manufacturing a window glass with a gasket, which has a high sealing property and has a small concentration of stress on the window glass despite variations in the shape of the window glass.

[Structure of the Invention] The present invention has a structure in which a window glass is placed in a molding die, and a gasket material is injection-molded into a gasket molding cavity space formed between the peripheral edge of the window glass and the inner surface of the molding die to provide a gasket. In the method for manufacturing a windowpane, a portion of the forming die that comes into contact with the windowpane is constituted by a metal plate elastically pressed against the windowpane via a hollow elastic body or a spring, and the forming die and the window are formed by the metal plate. It is characterized by sealing the contact surface with the glass.

[Operation] As described above, according to the present invention, the metal plate provided in the portion of the mold that contacts the window glass is elastically pressure-bonded to the window glass for sealing, so that the gasket material enters the portion. Therefore, it is possible to effectively prevent the occurrence of burrs and the like. In addition, since the metal plate is pressed against the window glass via the hollow elastic body or the spring, even if the shape of the molding die and the window glass do not completely match due to variations in the shape of the window glass, The plate follows the shape of the window glass to prevent concentrated stress from being applied to the window glass, and damage to the window glass can also be prevented.

[Examples of the Invention] Hereinafter, a method for manufacturing a window glass with a gasket according to the present invention will be described with reference to the drawings. 1 and 2
In the figure, members common to those in FIG. 3 are designated by the same reference numerals.

FIG. 1 shows an example of a molding die used in the manufacturing method of the present invention. In this molding die 20, hollow elastic bodies 21 are respectively arranged at contact portions between the upper mold 12 and the lower mold 13 and the window glass G, and the metal plate 22 is provided on the contact surface side of these hollow elastic bodies 21 with the window glass G. Is provided. Hollow elastic body 21
Serves to seal the cavity space 14 by elastically contacting the metal plate 22 with the window glass G.

As the hollow elastic body 21, an elastic material such as natural rubber, synthetic rubber or synthetic resin elastomer is adopted. For example, there are synthetic rubbers such as SBR, NBR, EPM and IIR, silicone rubbers (elastomers), polyurethane elastomers and other synthetic resin elastomers, and silicone rubbers (elastomers) having particularly good heat resistance are preferable.

The hollow elastic body 21 is preferably filled with a fluid such as gas or liquid in its internal space. In this case, the fluid is more preferably pressurized and filled, and the elastic force applied to the metal plate can be adjusted by the applied pressure. In addition,
This fluid may be sealed in advance in the hollow elastic body 21, or provided with an introduction pipe leading to the inside of the hollow elastic body 21,
After closing the molding die 20, the fluid may be pressure-filled through the introduction pipe.

There is no limitation on the cross-sectional shape of the hollow elastic body 21, for example, an annular ring,
The shape may be an elliptical ring, a polygonal ring, or any other shape. The hollow elastic body 21 conforms to the shape of the window glass G through the metal plate 22 and deforms when the molding die 20 is closed. Then, the metal plate 22 is brought into close contact with the window glass G to provide good sealability, and while the tightening pressure applied to the window glass G is dispersed, excessive stress is absorbed and the stress is concentrated on the window glass G. To prevent.

The metal plate 22 is a plate body made of iron, copper, nickel, other metals, stainless steel, brass, other alloys, or the like. It is preferable that the metal plate 22 has such a thickness that it can be deformed in conformity with the shape of the window glass G when pressed against the window glass G via the hollow elastic body 21.
Therefore, the thickness of the metal plate 22 is usually 0.05 to 2.0 mm, preferably 0.1 to 1.0 mm. In this case, if the material is hard, a relatively thin plate is used, and if the material is flexible, a relatively thick plate is adopted.
A metal plate having a thickness of 1.0 mm is particularly preferable in terms of durability and workability. Further, the metal plate 22 may be subjected to a treatment for imparting wear resistance or the like to its surface. Examples of such treatment include surface hardening treatment, treatment for forming a thin synthetic resin film or sheet on the surface, and treatment for improving releasability from the gasket material. Of course, when molding the gasket, the cavity space
It is common practice to apply the release agent to the inner surface of 14.

The molding die 20 can be made of various materials used for ordinary molding dies, and for example, metal or alloy such as iron, FRP, polymer concrete, concrete or the like is preferably adopted.

Next, a method for manufacturing a window glass with a gasket of the present invention using the molding die 20 having the above-described configuration will be described.

First, as shown in FIG. 1, the upper mold 12 and the lower mold of the molding die 20.
The window glass G is arranged so as to be sandwiched between 13. In this state, by closing the upper mold 12 and the lower mold 13, a cavity space 14 defined by the inner surface of the upper mold 12, the inner surface of the lower mold 13 and the peripheral edge of the window glass G is formed.

A metal plate 22 is elastically contacted with the window glass G through a hollow elastic body 21 at the portions of the upper mold 12 and the lower mold 13 that come into contact with the window glass G.
Then, due to the elastic deformation of the hollow elastic body 21 and the deformation of the metal plate 22, the metal plate 22 conforms to the shape of the window glass G and adheres to the surface thereof. At this time, the tightening force for the window glass G can be adjusted by the pressing force of the fluid filled inside the hollow elastic body 21. In this way, the contact surface between the mold 20 and the window glass G can be well sealed without concentrating the stress on the window glass G.

In this state, the gasket material is injected into the cavity space 14 and solidified to mold the gasket. At this time, the contact surface between the molding die 20 and the window glass G in the cavity space 14 is well sealed by the metal plate 22 elastically pressed by the hollow elastic body 21, so that the gasket material is applied to the contact surface. It does not invade and prevents the occurrence of burrs and the like. After forming the gasket in this way, the upper mold 12
Then, the lower mold 13 is opened, and the window glass G and the gasket can be taken out from the mold 20.

FIG. 2 shows a molding die 20 used in the manufacturing method of the present invention.
Another example of is shown.

This molding die 20 is different from the example of FIG. 1 in that a spring 23 and a hollow elastic body 21 form a composite elastic body 24, and a metal plate 22 is pressed against the window glass G by the composite elastic body 24. ing. A plurality of springs 23 are arranged at predetermined intervals along the length direction of the hollow elastic body 21. In this way, the spring 23 elastically presses the hollow elastic body 21 toward the window glass G, and the hollow elastic body 21 is further pressed.
Since the metal plate 22 is brought into pressure contact with the window glass G by means of the above, it is possible to further widen the tightening force of the molding die 20 against the window glass G and further improve the adaptability to the variation in the shape of the window glass G. it can. Therefore, stress concentration on the window glass G can be prevented more effectively.

In the molding die 20 of FIG. 2, the hollow elastic body 21 may be composed of a simple elastic member such as rubber or elastomer. In that case, the elastic force of the spring 21 and the elastic deformation of the elastic member are used. Thus, the metal plate 22 can be tightly pressed onto the surface of the window glass G. Also the spring
The 21 is not limited to the coil-shaped one shown in the figure, but various types such as a leaf spring can be used.

Further, the forming die 20 shown in FIGS. 1 and 2 has a structure in which the position of the upper die 12 in contact with the window glass G and the position of the lower die 13 in contact with the window glass G are deviated. However, the contact surfaces of the upper mold 12 and the lower mold 13 with respect to the window glass G may face each other at the same position, or may have another structure.

Further, in a portion where the upper die 12 and the lower die 13 of the molding die 20 directly contact with each other, an elastic member such as rubber or elastomer may be interposed to improve the sealing property. Further, the metal plate 22 is
It may be provided over the entire inner surface of the cavity space 14.

The window glass used in the present invention is an inorganic glass sheet or a laminate thereof. For example, one inorganic glass sheet, a laminated glass obtained by laminating two inorganic glass sheets with an intermediate film interposed therebetween, a double-layer glass in which two inorganic glasses are opposed to each other with a gap and the periphery is sealed, and one inorganic glass sheet Alternatively, there is a so-called bilayer glass in which a polyurethane film or a polyethylene terephthalate film is laminated on one surface of laminated glass. These window glasses may be bent, reinforced, or provided with a functional layer such as a heat ray reflective layer. In particular, an inorganic glass sheet which is bent and strengthened or not strengthened as described above and a laminate thereof are preferable. The window glass is used for automobile windows, architectural windows, etc., and particularly, automobile front windows and rear windows are preferable. The gasket can be formed not only on the entire circumference of the window glass G but also on a part of the circumference. For example, in the case of rectangular window glass, part 1
Gaskets can be formed on ~ 3 sides. But,
Most preferably, a gasket is provided on the entire circumference.

Furthermore, the gasket is made of synthetic resin or rubber,
In particular, it is preferable to use an elastomer or a soft synthetic resin. The gasket material injected into the mold comprises a melt of synthetic resin or a fluid synthetic resin raw material mixture which reacts in the mold to form a synthetic resin. Examples of the former include, but are not limited to, melted soft vinyl chloride resin, thermoplastic polyester elastomer, styrene-diene thermoplastic elastomer, and ethylene-unsaturated carboxylic acid copolymer. Examples of the synthetic resin obtained from the latter raw material mixture include, but are not limited to, polyurethane elastomers, polyurethane urea elastomers, polyurea elastomers, polyamide resins, epoxy resins, unsaturated polyester resins, and the like. .

Furthermore, as the injection molding using the molding die 20 in the present invention, reaction injection molding (RIM) is particularly preferable. This method is one of the methods of injecting the above-mentioned raw material mixture to perform molding, and at the time of injection, the raw material components are rapidly mixed and injected into a molding die, and at the same time, the raw material mixture is rapidly reacted in the molding die for synthesis. It is a molding method for obtaining a resin molded product. Compared to injection molding of molten synthetic resin, this method has excellent fluidity in the molding cavity and low internal pressure of the molding cavity, so it is extremely suitable as a method for molding a gasket around the window glass in the molding die. Is.

As the material of the gasket molded by reaction injection molding, the above-mentioned polyurethane elastomer, polyurethane urea elastomer, and polyurea elastomer are particularly preferable. These are obtained using a compound having two or more active hydrogen-containing functional groups selected from a hydroxyl group, a primary amino group or a secondary amino group and a compound having two or more isocyanate groups as reactive raw materials. These two
The above elastomer is formed by mixing and injecting various kinds of reactive raw materials at the time of injection, and reacting these two compounds in a mold. As the compound having two or more active hydrogen-containing functional groups, the molecular weight per functional group is 800 or more, especially 1000 to 4000, the number of functional groups per molecule is 2 to 2
8, especially 2 to 4 high molecular weight active hydrogen compounds and a chain extender (i.e. the number of functional groups per molecule is 2 to 8, especially 2 to 4
(A compound having a low molecular weight of 3, especially 400 or less) is preferred. Specifically, for example, polyether polyols, polyether polyamines, polyester polyols, hydroxyl group-containing hydrocarbon polymers, other high molecular weight active hydrogen compounds which are liquid at room temperature or under heating at the time of injection (about 60 ° C. or less), There are chain extenders such as ethylene glycol, 1.4-butanediol, diethyltoluenediamine and monochlorodiaminobenzene. Two or more kinds of these high molecular weight active hydrogen compounds and chain extenders can be used in combination. Particularly preferred high molecular weight active hydrogen compounds are polyether active hydrogen compounds such as polyether polyols and polyether polyamines, and diols and diamines as chain extenders. Examples of the compound having two or more isocyanate groups include diphenylmethane diisocyanate, polymethylene polyphenyl isocyanate, tolylene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, and other polyisocyanates and modified products thereof (for example, carbodiimidated modified products, prepolymer-modified products). , Nurate-modified products). The reactive raw material can be used together with other auxiliary raw materials. As auxiliary materials, for example, catalysts,
There are fillers, reinforcing agents, stabilizers (such as ultraviolet absorbers, light stabilizers, and antioxidants), coloring agents, and foaming agents.

[Advantages of the Invention] As described above, according to the present invention, a metal plate that is elastically pressure-contacted to a window glass through a hollow elastic body or a spring is arranged in a portion of the mold that contacts the window glass. Therefore, the sealing property at the contact surface between the molding die and the window glass is improved, and the occurrence of burrs or the like can be prevented. Also,
Due to the elastic force of the hollow elastic body or spring, the metal plate is elastically pressed while conforming to the shape of the window glass,
It is possible to avoid stress concentration on the window glass and prevent damage to the window glass.

[Brief description of drawings]

1 is a partial sectional view showing an example of a molding die for carrying out the method of the present invention, FIG. 2 is a partial sectional view showing another example of a molding die for carrying out the method of the present invention, FIG. FIG. 4 is a partial cross-sectional view of a molding die for manufacturing a conventional window glass with a gasket. In the figure, 12 is an upper mold, 13 is a lower mold, 14 is a cavity space, 20
Is a mold, 21 is a hollow elastic body, 22 is a metal plate, 24 is a composite elastic body, and G is a window glass.

Claims (4)

(57) [Claims] 1. A window glass with a gasket is manufactured by arranging a window glass in a molding die, and injecting a gasket material into a gasket molding cavity space formed between a peripheral edge of the window glass and an inner surface of the molding die. In the method described above, the portion of the forming die that comes into contact with the window glass is formed of a metal plate that is elastically pressed against the window glass via a hollow elastic body or a spring, and the metal plate makes contact between the forming die and the window glass. A method for manufacturing a window glass with a gasket, which comprises sealing a surface. 2. The method for manufacturing a window glass with a gasket according to claim 1, wherein the injection molding is performed by reaction injection molding. 3. A method for manufacturing a window glass with a gasket according to claim 1, wherein the metal plate has a thickness of 0.1 to 1.0 mm. 4. The method for manufacturing a window glass with a gasket according to claim 1, wherein a pressurized fluid is introduced into the hollow elastic body.