JPH06246792A - Resin mold - Google Patents

Abstract

PURPOSE:To integrally mold a resin frame member without generating a crack or damage in a plate-shaped member such as a glass plate, in integrally molding the resin frame member by injecting a resin in the cavity formed by the periph eral edge part of the plate-shaped member and a pair of molds holding the peripheral edge part of the plate-shaped member therebetween, by covering the contact surfaces of the molds with the plate-shaped member with a fluoroplastic layer. CONSTITUTION:The contact surfaces of a movable mold 3 and a fixed mold 4 holding a plate-shaped member 1 therebetween with the plate-shaped member 1 are covered with fluoroplastic layers 5 and the plate-shaped member 1 is held between the molds through the fluoroplastic layers 5. For example, fluoroplastic to be used is pref. selected from a tetrafluoroethylene resin, a perfluoroalkyl vinyl ether/tetrafluoroethylene copolymer, a tetrafluoroethylene/ ethylene copolymer, a tetrafluoroethylene/hexafluoropropylene copolymer, a vinylidene fluoride resin, perfluoroalkyl acrylate and a mixture of two or more kinds of derivatives of those resins.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding die for integrally molding a resin frame body around a plate body.

[0002]

2. Description of the Related Art A windshield for a vehicle has been attached to a vehicle body by attaching glass to the vehicle body and then attaching the glass to the periphery of the glass, which 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 resin frame for windshield 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 a mold with a glass plate,
Furthermore, after it is equipped with a metal molding, clips, etc., it is manufactured by integrally molding the windshield resin frame body by injection molding, and since the resin frame body is integrally molded on the glass plate, the number of assembly steps In addition, the water-tightness and adhesion are excellent, and an excellent appearance can be provided. However, on the other hand, the glass, which is a brittle material, is sandwiched under pressure in the mold, so the glass is easily broken. To prevent this, attach an elastic material such as polyethylene tape to the surface of the mold that contacts the glass. It has been proposed to relax the stress applied to the glass by inserting an elastic material or introducing a structure in which the glass contact surface slides with a spring.

[0004]

However, by simply attaching an elastic material such as polyethylene tape to the surface of the conventional resin molding die that comes into contact with the glass, the elastic material will not be removed when the die and the glass are pulled apart. The elastic material may come off from the mold or due to resin pressure. Therefore, the elastic material has to be replaced and the resin must be molded each time, and the continuous process of manufacturing the plate-shaped body integrated with the resin frame is interrupted many times.

Further, when the elastic material is peeled off as described above, it is necessary to replace the elastic material with respect to the entire mold, which requires a work by a plurality of people. Therefore, it is extremely troublesome, and the time required for re-pasting is long, and the efficiency of continuous molding is very poor.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a new resin molding die which has not been known hitherto.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A peripheral edge portion of a plate-shaped body is held by a pair of molds, and the peripheral edge portion of the plate-shaped body and In a resin molding die in which a resin is injected into a cavity space formed in a desired shape by a pair of molds, and a resin frame body is integrally molded at a peripheral portion of the plate body, the plate body of the mold The contact surface is covered with a fluororesin layer to provide a resin molding die.

The present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing an example of a basic configuration of a resin molding die of the present invention. The resin molding machine main body is composed of a movable die 3 and a fixed die 4, and a cavity space 2 is formed by the movable die 3 and the fixed die 4 and a plate-shaped body 1 whose peripheral edge is sandwiched by these, and a spool 6 The resin for the frame body guided from is injected into the cavity space 2.

The abutting surfaces of the movable die 3 and the fixed die 4 that sandwich the plate-shaped body 1 with the plate-shaped body 2 are covered with a fluororesin layer 5, and the plate-shaped body 1 has the fluororesin layer. It is sandwiched between the molds via 5.

The fluororesin covering the contact surface of the mold with the plate-shaped body is, for example, tetrafluoroethylene resin (PTF).
E), perfluoroalkyl vinyl ether-tetrafluoroethylene copolymer (PFA), tetrafluoroethylene-ethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), and further At least one kind of these fluorocarbon resin derivatives or a mixture of two or more kinds thereof can be preferably used.

These fluororesin layers are formed by methods such as electrostatic coating on the portion where the mold is in contact with the plate-like body, followed by baking coating, spraying or applying a solution, spraying or applying an aqueous dispersion, and the like. However, the present invention is not limited to these.

Further, the thickness of the fluororesin layer is appropriately determined depending on the shape of the plate-shaped body on which the resin frame is integrally molded, and is such that burrs do not occur when the resin is injected and the plate-shaped body is formed. In order to prevent cracks and scratches, the thickness is preferably in the range of 10 to 500 microns, more preferably 50 to 300 microns.

The portion of the fluororesin layer covering the mold may be left in the state of being coated by the above-mentioned method or the like, or may be cut after the coating so as to reduce the coating portion, or the thickness of the portion may be reduced. It can be scraped off for adjustment, and the fluororesin layer can be adjusted to a desired shape depending on the shape of the plate-shaped body and the portion of the mold that contacts the plate-shaped body.

The fluororesin to be coated may be used as a resin alone, or may be an inorganic filler, carbon, or a thermoplastic resin other than fluororesin such as polyphenylene sulfide, polyamide, polyamide-imide, polyimide,
A liquid crystal polymer or the like can also be contained.

Here, the frame body in the present invention is a generic term for a gasket, a molding, a weather strip, a seal rubber or the like formed around a plate-like body, and is provided on the entire circumference of the plate-like body. Or it may be interrupted in the middle of the entire circumference,
Alternatively, it may be provided on one side or several sides of the plate-shaped body.

Resins that can be used as the material of the resin frame of the present invention include thermoplastic resins and thermosetting resins.
As the thermoplastic resin, at least one kind of polyvinyl chloride (PVC), a copolymer of vinyl chloride and ethylene, a copolymer of vinyl chloride and vinyl acetate, a copolymer of vinyl chloride and propylene, a copolymer of vinyl chloride and ethylene and vinyl acetate, or 2 Although a compound as a soft material is prepared by adding an additive such as a plasticizer based on a mixture of one or more kinds, other thermoplastic resins may be blended. For example, chlorinated polyethylene, urethane modified vinyl chloride resin, urethane resin, polyester resin, liquid crystal polymer, acrylic resin, 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. Further, urethane RIM is preferable as the thermosetting resin.

An adhesive layer may be preliminarily provided on the peripheral portion where the plate-shaped resin frame body is integrally molded. As the adhesive agent, urethane-based, phenol-based, acrylic-based,
One or two or more adhesives such as nylon and epoxy can be used.

The plate in the present invention may be a flat plate or a curved plate, and its material may be a glass plate, laminated glass, tempered glass, double glazing, synthetic resin. A plate made of, or a laminated plate obtained by combining these plates is also used. As the synthetic resin, for example, so-called organic transparent resin materials such as polycarbonates, polystyrenes, polymethylmethacrylates, etc. can be used, and at least two or more of these materials can be laminated. Further, this plate-shaped body can be applied to windows such as a rear, front, roof, side, opera, rear quarter, front bench, and center pillar of a vehicle.

The resin molding machine body according to the present invention is
As shown in the figure, it is not limited to the fixed type on the lower side and the movable type on the upper side, of course, for example, the plate-like body can be fixed in the vertical direction by suction by vacuum, and can be sandwiched by the molds from the left and right, Other various molds are appropriately used as necessary.

[0020]

EXAMPLE An example using a resin molding die based on FIG. 1 will be described below. (Example 1) When a plate-shaped body made of single-plate glass is sandwiched between molds, tetrafluoroethylene-
Ethylene copolymer (Aflon COP ^R : manufactured by Asahi Glass Co., Ltd.) was powder coated and then baked and coated at 300 ° C. to 30
The mold was coated with a fluorocarbon resin layer having a thickness of 0 micron. This mold is used to inject PVC into the cavity space, and a PVC with hardness of 65 is used to produce MAW for the automobile side.
00 shots were continuously molded. No peeling of the fluororesin layer occurred even after this 2000-shot injection molding.
In addition, the glass did not have scratches or cracks such as mold hits.

(Example 2) The same procedure as in Example 1 was carried out except that the film thickness of 150 μm was obtained by cutting the fluororesin layer. As a result, the occurrence of glass scratches and the exfoliation of the fluororesin layer was confirmed. I couldn't do it.

(Example 3) As a result of carrying out the same procedure as in Example 1 except that PVC having a hardness of 90 was used, neither glass scratch nor peeling of the fluororesin layer was observed.

(Example 4) A perfluoroalkyl vinyl ether-tetrafluoroethylene copolymer (PFA) was powder coated and then baked at 390 ° C for coating.
The same procedure as in Example 1 was carried out except that a fluororesin layer having a film thickness of micron was obtained. As a result, neither glass scratch nor peeling of the fluororesin layer was observed.

(Example 5) Results obtained in the same manner as in Example 1 except that a modified polytetrafluoroethylene was applied to a mold by spraying and baked at 250 ° C to obtain a film thickness of 150 microns. No glass scratches or peeling of the fluororesin layer was observed.

Example 6 The same as Example 1 except that a 2: 1 (weight ratio) blend of tetrafluoroethylene-ethylene copolymer and polyphenylene sulfide was electrostatically coated and then baked and coated at 300 ° C. As a result, it was not found that the glass was scratched or the fluororesin layer was peeled off.

(Comparative Example 1) A single glass sheet was sandwiched between molds as it was, and the mold was clamped, and then a MAW for the automobile side was molded, but glass scratches were observed in 30 shots out of 100 shots. Also, two glass cracks occurred.

(Comparative Example 2) When a plate-shaped body made of single-plate glass is sandwiched between molds, 0.0 is applied to the contact surface of the mold with the plate-shaped body.
After the 8 mm PTFE tape was attached, the mold was clamped, and MAW for the automobile side was continuously formed by 500 shots, but the tape reattachment work was required 10 times in the meantime.

(Comparative Example 3) As a tape to be attached, 0.
Comparative Example 2 was repeated except that a 2 mm polyethylene tape was attached. The tape replacement work was performed 20 times.

[0029]

According to the present invention, the abutting surface of the resin molding die for integrally molding the resin frame body on the plate body, which presses and holds the plate body, is covered with the fluororesin layer. Therefore, the resin frame body can be integrally molded without cracking the plate-shaped body, particularly the glass plate, and scratches on the glass surface. In addition, like the sticking of the elastic tape to the mold, the deviation that occurs due to the resin pressure when injecting the resin into the mold, and the deviation and peeling that occur when removing the plate-shaped body from the mold are also possible. In addition, it is possible to obtain a mold with an adhesive capacity sufficient to endure continuous molding of MAW, and the effect of not having to reattach the tape during continuous molding is also recognized. By this, in the mold It also has an excellent effect that the automation of the line can be promoted because the manual work of is eliminated.

The temperature of the resin injected into the mold is usually 2
If the temperature is around 00 ° C and the heat resistance is insufficient when coming into contact with the injected resin, the coating layer provided on the mold may be detached or peeled off due to the pressure of the injected resin. Since the fluororesin layer provided on the contact surface of the mold has high heat resistance, the above-mentioned problems can be suppressed. Further, according to the present invention, the fluororesin has a small friction coefficient and is contained in the cavity. Due to the resin pressure when injecting the resin, a slight displacement in the mold of the plate-like body prevents the plate-like body such as glass from cracking, and the resin frame body is integrated at the correct position on the peripheral edge of the plate-like body. It can be molded.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an example of a basic configuration of a resin molding die of the present invention.

[Explanation of symbols]

 1: Plate-like body 2: Cavity space 3: Movable type 4: Fixed type 5: Fluororesin layer 6: Spool

Claims (2)

[Claims] 1. A peripheral portion of a plate-shaped body is sandwiched by at least a pair of molds, and resin is injected into a cavity space formed in a desired shape by the peripheral portion of the plate-shaped body and the pair of molds. A resin molding die in which a resin frame is integrally formed on the peripheral edge of a plate-shaped body, wherein a contact surface of the mold with the plate-shaped body is covered with a fluororesin layer Mold for. 2. A fluororesin is tetrafluoroethylene resin (PT
FE), perfluoroalkyl vinyl ether-tetrafluoroethylene copolymer resin (PFA), tetrafluoroethylene-ethylene copolymer resin (ETFE), tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP) , Vinylidene fluoride resin (PVdF), perfluoroalkyl acrylate, one or two of derivatives of these resins
2. A mixture of at least one species selected from the above.
Mold for resin molding.