JPH05285982A - Manufacture of glass plate having molding - Google Patents

Abstract

PURPOSE:To make appearance of a glass plate having molding excellent by constituting a part of a die, to which resin flows, of sintered metal and injecting the resin into the die with a pressure of 500kgf/cm<2> or less. CONSTITUTION:A glass plate having molding is manufactured such that a glass plate is mounted on a resin molding die and held so as to mold resin molding integrally at the periphery. At least a part of the die to which resin flows is constituted of sintered metal and the resin is injected into the die with a pressure of 500kgf/cm<2> or less. In the die, a gas vent communicating from the sintered metal to the outside of the die is provided, so that gas flowing from the sintered metal part is discharged to the outside of the die forcibly. Accordingly, when the resin molding is to be molded integrally with the glass plate, the glass does not crack because the injection pressure of the resin is 500kgf/cm<2> or less. In addition, as the gas in the die passes through from the hole of the sintered metal, resin fusion at a welded part will be complete even if the injection pressure is low, so that a glass with molding having excellent appearance can be obtained without generating shrinkage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a glass plate with a molding, and more particularly to a method for producing a laminated glass integrally molded with a resin molding.

[0002]

2. Description of the Related Art A windshield for a vehicle has been mounted on a vehicle body by attaching a glass plate to the vehicle body and then mounting the windshield around the glass plate, but it requires a large number of assembling steps and is excellent. No watertight windshield was obtained.

Therefore, in recent years, a glass window in which a windshield molding is integrally formed around a glass plate, which is commonly called a module assembly window (hereinafter referred to as MAW), has become popular. This MAW is manufactured by equipping a mold with a glass plate, a metal molding, a clip, etc., and then integrally molding a windshield molding by injection molding. A resin molding is molded integrally with the glass plate. As a result, the number of assembly steps is small, the watertightness and adhesion are excellent, and the excellent appearance can be provided.

[0004]

In the conventional MAW manufacturing method, when the resin is injected into the mold, the air pressure in the mold increases due to the inflow of the resin. It was necessary to inject at a pressure of over 500 kgf / cm @ 2). However, when performing injection by this injection pressure, the stress applied to the glass plate is large, especially if the glass plate is bent or the glass plate is laminated glass, such glass plate is easily broken, so resin injection It had a drawback that the glass was easily broken during or after injection.

On the contrary, if the injection pressure is reduced so that the laminated glass is not broken, a resin molding having an excellent appearance cannot be obtained as the air pressure in the mold rises.
The resin does not weld well at the weld part where the resin that flows in from multiple points is connected, and a seam called a weld line remains in the finished resin molding,
Alternatively, since sink marks are generated in the resin molding, a resin molding having a good appearance cannot be obtained, and it is extremely difficult to manufacture a MAW of laminated glass.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a novel method of manufacturing a glass plate with molding, which has not been known in the past. is there.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a glass plate is mounted and sandwiched in a resin molding die, and a resin is injected into the die to form a glass. A method of manufacturing a glass plate with a molding in which a resin molding is integrally molded on a peripheral portion of a plate, wherein at least a part of a mold into which the resin flows is made of a sintered metal, and 500
The present invention provides a method for producing a glass plate with a molding, which comprises injecting a resin at a pressure of kgf / cm2 or less.

The molding in the present invention is a general term for gaskets, moldings, weather strips, seal rubbers, etc. formed around the glass plate, and may be provided all around the glass plate. Or, it may be interrupted in the middle of the entire circumference, or may be provided on one side or several sides of the glass plate.

Further, the glass plate in the present invention may be a flat plate or a curved plate,
As the material, even laminated glass that has not been tempered can be used because glass cracking does not occur when integrally molding a resin molding, and it is not limited to laminated glass and is also single glass or tempered glass. Needless to say, double glazing and the like can also be used. Further, the glass plate in the present invention is, for example, a plate made of a so-called organic transparent resin material such as polycarbonates, polystyrenes, polymethylmethacrylates, or the like, or a plate made of at least two or more of these and made of a synthetic resin. In addition, it is possible to generically call a glass plate including a laminated plate obtained by combining the glass plates as described above.

The injection pressure of the resin in the manufacturing method of the present invention is 500 kg at the injection pressure of the molding machine because the glass is broken in the mold when the injection pressure exceeds 500 kgf / cm 2.
f / cm2 or less, but even if it is too low, weld lines may remain in the molded product or sink marks may occur, so the injection pressure of the molding machine is 100 to 350.
The range of kgf / cm @ 2 is particularly preferred.

The molding material used in the present invention is a thermoplastic resin such as polyvinyl chloride (hereinafter referred to as PVC), a copolymer of PVC and ethylene, a copolymer of PVC and vinyl acetate, a copolymer of PVC and propylene. Copolymer, PVC
At least one or a mixture of two or more copolymers of ethylene and vinyl acetate is used as a soft material by adding an additive such as a plasticizer as a base resin, but other compounds are added to improve fluidity. It is also possible to blend a thermoplastic resin. As the thermoplastic resin to be blended, chlorinated polyethylene, urethane-modified vinyl chloride resin, urethane resin, polyester polymer, acrylic resin, polyester elastomer, NBR or SBR
At least one kind of rubber containing at least the above, EVA, ABS or a mixture of two or more kinds thereof is used.

The sintered metal used in the present invention is preferably embedded in the weld forming portion where the resin flowing from a plurality of locations of the mold is connected, and the shape and size are not limited.
The optimum shape is determined according to the product cross-sectional shape. The embedding place may be either on the mold side or the core side of the mold, but it is more preferable to embed it on the core side in appearance.
The material of the sintered metal includes stainless steel, aluminum, ceramics, etc., but stainless steel is more preferable from the viewpoint of corrosion resistance and durability. The porosity is preferably in the range of 5 to 60%, more preferably 10 to 40%. The pore size can be selected variously, but is 2 to 20 μm, and more preferably 5 to 15 μm. Porcelain II (manufactured by Shinto Kogyo Co., Ltd.) is a sintered metal that satisfies these specifications.
Is typical.

Further, in order to further release the gas released from the sintered portion to the outside of the mold, the mold is provided with a gas release from the sintered metal to the outside of the mold, and if necessary, a vacuum pump. It is also possible to forcibly remove the gas outside the mold by using, for example, the like.

Further, the resin molding temperature in the present invention is
There is no particular limitation as long as it is within a range of a temperature at which the resin is sufficiently melted and a temperature at which the resin is not decomposed, but preferably 1
It is in the range of 70 ° C to 210 ° C. In addition, it is determined that the molding temperature, the number of gate points, the combination pattern of the injection pressure and the holding pressure are appropriately combined as other molding conditions to suppress the stress generated in the glass plate to the minimum and to eliminate the appearance defect of the molding. .

Furthermore, the molding integrally molded with the glass plate in the present invention is not only a black resin molding having a simple appearance, but also an integral molding of ionomer-coated bright molding and resin molding, SUS molding and resin molding. When the glass plate is attached to the mold, such as the integrated molding of No. 1, these moldings may be attached together with the glass plate to form an integrally molded molding of the metal molding and the resin molding on the glass plate. Further, these glass plates with moldings can be applied to windows such as vehicle rears, roofs, sides, operas, rear quarters, front benches, and center pillars.

[0016]

According to the present invention, the injection pressure of resin is 500 kg.
Since it is f / cm2 or less, the laminated glass does not break when the resin molding is integrally molded on the glass plate, particularly the laminated glass. Also, when the resin is injected into the mold, the gas in the mold escapes from the pores of the sintered metal, so even if the injection pressure is small, the resin in the weld forming part will not be welded well and will be completed. The welded line does not remain in the resin molding and sink marks do not occur, and the laminated glass with molding has an excellent appearance.

[0017]

【Example】

(Example 1) After degreasing a laminated glass for automobile roof, an adhesive for adhering a molding is applied, the laminated glass is dried and preheated, and the laminated glass is mounted on a mold and nipped, and
Injection molding was performed using VC compound (manufactured by Riken Vinyl Industry Co., Ltd.) as a resin molding material. On the core side of the weld forming part of the mold, sintered metal (Porcellax I manufactured by Shinto Kogyo Co., Ltd.
I) is embedded and the resin injection pressure of the molding machine is 30
As a result of 0 kgf / cm @ 2, the welding of the resin in the weld forming portion was complete, and the weld line was hardly noticeable. Further, the resin was integrally molded on the laminated glass with 100 sheets continuously, but the glass did not crack when the resin was injected.

(Example 2) PVC as a resin molding material
In the same manner as in Example 1 except that a compound (manufactured by Sekisui Chemical Co., Ltd.) was used, after degreasing the laminated glass for automobile front, an adhesive for bonding the molding was applied, and the laminated glass was dried and preheated. It was attached to the mold and pinched.
As a result of injection molding at a resin injection pressure of the molding machine of 350 kgf / cm @ 2, the weld line was hardly noticeable. Further, the resin was integrally molded on the laminated glass with 150 sheets continuously, but the glass did not crack when the resin was injected.

(Example 3) PVC as a resin molding material
In the same manner as in Example 1 except that the compound (manufactured by Shin-Etsu Polymer Co., Ltd.) was used, after degreasing the laminated glass for automobile front, an adhesive for bonding the molding was applied, and the laminated glass was dried and preheated. It was attached to the mold and pinched. As a result of injection molding at a resin injection pressure of 280 kgf / cm @ 2, the weld line was hardly noticeable. Further, the resin was integrally molded on the laminated glass with 100 sheets continuously, but the glass did not crack when the resin was injected.

(Example 4) PVC as a resin molding material
In the same manner as in Example 1 except that a compound (manufactured by Mitsubishi Kasei Vinyl Co., Ltd.) was used, after degreasing the laminated glass for automobile rear, an adhesive for bonding the molding was applied, and the laminated glass was dried and preheated. It was attached to the mold and clamped. As a result of injection molding at a resin injection pressure of 250 kgf / cm @ 2, the weld line was hardly noticeable. Further, the resin was integrally molded on the laminated glass with 100 sheets continuously, but the glass did not crack when the resin was injected.

Comparative Example 1 A resin molding was injection-molded in the same manner as in Example 1 except that the sintered metal was not embedded in the mold. As a result of injection molding at a resin injection pressure of 280 kgf / cm2, glass was not cracked when resin was injected after continuously molding 10 sheets, but welding at the weld portion was incomplete, and the weld line The groove was deep and the appearance was poor.

(Comparative Example 2) As a result of injection molding with a resin injection pressure of 600 kgf / cm 2 without embedding a sintered metal in a mold, there were some incomplete welds in the weld forming portion, and the weld line There were variations in the depth of the groove, and three glass pieces were cracked when the resin was injected although ten pieces were continuously molded.

Comparative Example 3 A resin molding was injection-molded in the same manner as in Example 3 except that the sintered metal was not embedded in the mold. As a result of injection molding at a resin injection pressure of 300 kgf / cm2, no glass cracks occurred when resin was injected after 10 sheets were continuously molded, but welding at the weld portion was incomplete and the weld line The groove was deep and the appearance was poor.

(Comparative Example 4) As a result of injection molding at a resin injection pressure of 550 kgf / cm 2 without embedding a sintered metal in a mold, there were some incomplete welds in the weld forming part, and the weld line There were variations in the depth of the groove, and four glass pieces were cracked when the resin was injected although ten pieces were continuously molded.

[0025]

According to the present invention, when the resin molding is integrally formed on the glass plate, the injection pressure of the resin is 500 kgf / cm2.
Since it is as follows, when the resin molding is integrally molded on the glass plate, particularly the laminated glass, the glass can be prevented from cracking due to the small injection pressure of the resin. In addition, since the sintered metal is embedded in the weld forming part of the mold, the gas in the mold escapes from the holes of the sintered metal when the resin is injected into the mold, so the injection pressure is It is possible to prevent the weld line from remaining due to the small size of the resin in the weld forming part that does not weld well, and it is possible to prevent sink marks from occurring. Thus, it is possible to obtain a laminated glass with a molding having an excellent appearance.

Further, according to the present invention, since the resin molding is integrally formed on the glass plate, the number of assembling steps is small, and a glass plate with a molding for vehicles which is excellent in watertightness and adhesion can be obtained.

Claims (4)

[Claims] 1. A method of manufacturing a glass plate with a molding, in which a glass plate is mounted and sandwiched in a resin molding die, and resin is injected into the mold to integrally form a resin molding around the periphery of the glass plate. At least a part of a mold into which the resin flows is made of a sintered metal, and the resin is injected into the mold at a pressure of 500 kgf / cm 2 or less. 2. The method for producing a glass plate with a molding according to claim 1, wherein the glass plate integrally forming the molding is a laminated glass. 3. The method for manufacturing a glass plate with a molding according to claim 1, wherein a resin molding is integrally molded by mounting a metal molding together with the glass plate on the mold. 4. The method for producing a glass plate with a molding according to claim 3, wherein the metal molding is a SUS molding.