JP2969640B2 - Method of manufacturing synthetic resin window - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a synthetic resin window, and more particularly to a method for manufacturing a synthetic resin window suitable for a vehicle.

[Conventional technology]

FIG. 7 is a perspective view of a conventional synthetic resin window as shown in Japanese Utility Model Publication No. 61-32808.

In the figure, reference numeral 1 denotes a window made of synthetic resin, which is attached to a flange portion 3 opened at a window attachment position of a vehicle body panel 2 of a vehicle. The window 1 is composed of a window body 4 made of a transparent synthetic resin and a frame 5 formed on the periphery thereof. The frame portion 5 has a shape corresponding to the flange portion 3 of the vehicle body panel 2,
On the mounting surface side, a boss 7 for fixing the mounting member 6 is integrally formed. The mounting member 6 is inserted into the mounting hole 3a of the flange portion 3 and fixed with a nut 8, so that the synthetic resin window 1 is mounted on the flange portion 3 of the vehicle body panel 2.

A cushioning material 9 made of a soft material is attached to a portion of the frame portion 5 that comes into contact with the vehicle body panel 2.
To improve adhesion.

Also, since the window body 4 is made of resin and easily damaged,
The surface is covered with a hard coating 10 composed of a hard coat layer, and the outer surface of the frame portion 5 is covered with an opaque coating portion 11 composed of a colored opaque coating layer.

Such a synthetic resin window 1 is manufactured by injection molding of a transparent synthetic resin such as a polycarbonate resin or an acrylic resin.

Since such a conventional synthetic resin window is made of synthetic resin, it has a significantly lower rigidity than inorganic glass,
When mounted on the vehicle body panel, deformation or damage is likely to occur due to tightening or the like. If a thick portion such as a reinforcing rib is formed on a frame portion or the like in order to compensate for the lack of rigidity, there is a problem that deformation such as sink marks occurs on the outer surface side of the rib, which impairs the appearance.

[Problems to be solved by the invention]

An object of the present invention is to solve the above-mentioned problems, so that even if the window main body is formed to be lightweight and rigid and has a thickness of about the same as inorganic glass, no deformation or breakage due to mounting or the like occurs, and the ribs are formed. An object of the present invention is to provide a method for manufacturing a synthetic resin window in which sinks and the like are less likely to occur on the outer surface even when formed.

[Means for solving the problem]

The present invention is the following method for manufacturing a synthetic resin window.

(1) It is formed so as to correspond to the outer shape of a window integrally having a plate-shaped window main body and a frame portion having a thickness greater than the thickness of the window main body along the periphery of the window main body. And the frame forming part has a wide flow path through which gas can flow in the resin, while the window main body forming part has a narrow flow path for preventing gas from entering the resin, Injecting a molten transparent synthetic resin in an amount to integrally form a frame portion having a hollow portion inside,
A frame portion is formed in the frame forming portion of the cavity, and a window body portion is formed in the window body forming portion. A high-pressure gas is injected into the resin of the frame forming portion before the resin injected into the cavity is solidified. A method for manufacturing a synthetic resin window, comprising: expanding along a frame portion, thereby forming a hollow portion along the longitudinal direction only inside the frame portion.

(2) A transparent resin film / sheet having a hard coating on the surface is arranged in a cavity corresponding to the window body so that the hard coating side faces the mold surface, and a transparent synthetic resin is injected, and the film / sheet is formed. The method for manufacturing a synthetic resin window according to the above (1), wherein the resin is integrated into the window body.

(3) The method for manufacturing a synthetic resin window according to the above (1), wherein a hard coating is formed on the window body after the mold is opened.

(4) After opening the mold, form an opaque coating on the surface of the frame,
The method for manufacturing a synthetic resin window according to the above (1), wherein the hollow portion is shielded from being seen through from the outer surface side.

 In the present invention, transparent includes translucent.

(Operation)

According to the present invention, a sufficient amount of resin is injected into a cavity having a frame forming portion and a window main body forming portion to integrally form a frame portion having a hollow portion and a solid main body portion. When the high pressure gas is injected into the resin of the frame portion before the resin is solidified, the high pressure gas expands in the resin of the frame portion and moves along the frame portion to flow the resin, thereby The resin is filled in the cavity to form a synthetic resin window having a hollow portion. In the synthetic resin window obtained by this,
Since the frame portion having the outer shape larger than the thickness of the window body is formed, the rigidity is increased. In addition, since the hollow portion is formed inside the frame portion, the substantial thickness of the synthetic resin forming the frame portion can be reduced,
Even if the outer shape of the frame portion is increased, deformation such as sink marks is prevented, and the entire weight is reduced.

〔Example〕

Hereinafter, a synthetic resin window obtained by the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a vehicle side window according to an embodiment, and FIG. 2 is a sectional view taken along line AA of FIG. In the figure, the same reference numerals as those in FIG. 7 indicate the same or corresponding parts.

The window 1 made of synthetic resin includes a window body 4 formed of a transparent synthetic resin in a plate shape, a frame 5 integrally formed on the periphery of the window body 4 with the same resin, and a window body. Hard coating 10 covering the surface of 4
And an opaque covering portion 11 that covers the surface of the frame portion 5.

The window body 4 and the frame 5 are integrally formed of a transparent synthetic resin such as a polycarbonate resin and an acrylic resin.

The frame portion 5 has an outer shape larger than the thickness of the window main body portion 4, a hollow portion 12 is formed therein, and the surrounding resin portion 5 a forming the hollow portion 12 has substantially the same thickness as the window main body portion 4. Has become. The hard coating 10 is formed on the entire outer surface of the window main body 4, but may be formed on the rear surface. The hard coating 10 has a hardness such as an organosiloxane-based surface treatment film that prevents damage due to car washing or the like. The opaque covering portion 11 shields the hollow portion 12 of the frame portion 5 from being seen through from the outer surface side, and is formed of a colored opaque coating film or the like. An engagement portion 5b is formed on the outer peripheral portion of the frame portion 5, and is engaged with a cushioning material (end rubber) 9 made of a hard material.

FIG. 3 is a cross-sectional view of an injection molding apparatus used in the manufacturing method of the present invention, and FIG. 4 is a BB cross-sectional view thereof. Molding equipment 13
A cavity 16 is formed between the upper mold 14 and the lower mold 15, and a sprue 18, a runner 19 and a gate 20 are formed from an injection nozzle 17.
The resin 21 is injected through. The cavity 16 includes a window body molding 16a and a frame molding 16b having a thickness greater than that of the window body molding 16a.A gas injection port 23 is provided near the gate 20 of the frame molding 16b. It is connected to the injection device 24.

The manufacturing method of the window 1 is as follows. The injection nozzle 17 passes through the sprue 18, the runner 19, and the gate 20 through the cavity 16.
After the resin 21 is injected into the cavity 16 and cooled and solidified after the resin 21 enters the cavity 16, the gas injection device 24
High pressure gas such as nitrogen gas is injected through 23. When the resin 21 flows through the cavity 16, the high-pressure gas expands and flows along the frame forming section 16b having a large flow path and a small flow resistance, and the resin in the frame forming section 16b adheres to the mold surface and solidifies. A frame portion 5 having a hollow portion 12 having a closed cross section is formed therein. The window main body forming portion 16a has a narrow flow path and a large resistance, so there is no intrusion of high-pressure gas.
Is solidified to form a solid plate-shaped window main body 4.

After opening the mold, the window main body 4 is subjected to a hardening film treatment or the like to form a hard coating 10 and to shield the hollow portion 12 formed inside the frame portion 5 from being seen through from the outer surface side. An opaque covering portion 11 having a width exceeding the width of the hollow portion 12 is formed on the surface thereof by painting or the like, and the window 1 is completed. The hard coating 10 may be formed by insert molding by inserting a transparent resin film / or sheet having the hard coating 10 into an injection mold, and forming the resin film / or sheet having the hard coating 10 on the surface, The hard coating 10 is disposed in the cavity 16 corresponding to the window main body 4 so as to face the mold surface, and the resin 21 is injected to laminate and integrate the resin film / sheet with the window main body 4. In this case, the hard coating 10 can be formed at the same time as the injection molding of the window main body 4 without requiring a separate step.

The window 1 manufactured in this manner is used by attaching it to the flange portion 3 of the vehicle body panel 2 via a cushioning material 9 with an adhesive or the like.

In the mounted state, the window 1 has a large outer shape at the periphery and the frame portion 5 having the hollow portion 12 having a closed cross-sectional shape, so that the window 1 has high rigidity and does not deform or break. The frame 5 has a hollow 12
The resin part on the outer surface side is lightweight because it has
The substantial thickness of 5a can be made substantially equal to that of the window main body 4, thereby preventing deformation such as sink marks.

FIG. 5 is a sectional view taken along line AA of FIG. 1 showing another embodiment. In this embodiment, a rib 5c is provided on the resin portion 5a on the inner surface of the frame portion 5.
Are formed, and the rigidity is further increased. By forming the rib 5c on the inner surface side, sink and deformation on the outer surface side are prevented.

FIG. 6 is a sectional view of an injection molding apparatus according to another embodiment. In this embodiment, the gas injection port 23 is not provided separately, but is shared by the gas injection port 23 and the resin injection gate 20, and the injection nozzle 17 is connected to the sprue 18, the runner 19 and the second sprue.
Inject resin 21 and inject high-pressure gas through 18a. This manufacturing method is suitable for the case where the number of the gates 20 is one or the size of the molded product is small.

In the above embodiment, the example of the side window has been described, but the present invention can be applied to other windows. Further, the shapes of the window main body 4 and the frame 5 are not limited to those shown in the figure, but can be modified.

〔The invention's effect〕

According to the manufacturing method of the present invention, a predetermined amount of resin is injected into a cavity having a frame forming portion in which gas flows in the resin and a window body forming portion in which gas does not flow in the resin, and before the resin is solidified. Since a hollow portion is formed by injecting high-pressure gas into the resin of the frame portion, a large-sized frame portion having a hollow portion can be integrally formed with the peripheral portion of the window main body portion, thereby reducing the weight. Therefore, a synthetic resin window having excellent rigidity, no deformation or breakage at the time of mounting, and excellent appearance without sink marks can be manufactured by injection molding.

[Brief description of the drawings]

1 is a perspective view of a side window for a vehicle according to an embodiment, FIG. 2 is a sectional view taken along line AA, FIGS. 3 and 6 are sectional views of an injection molding apparatus, and FIG. -B sectional view, fifth
FIG. 7 is a sectional view taken along line AA of FIG. 1 showing another embodiment, and FIG. 7 is a perspective view of a conventional synthetic resin window. In the drawings, the same reference numerals denote the same or corresponding parts, 1 denotes a window, 2 denotes a vehicle body panel, 4 denotes a window main body, 5
Is a frame portion, 10 is a hard coating, 11 is an opaque coating portion, 12 is a hollow portion, and 13 is a molding device.

────────────────────────────────────────────────── (5) References JP-A-63-268611 (JP, A) JP-A-62-202418 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B60J 1/00 B29C 45/00

Claims (4)

(57) [Claims] 1. A window body having a plate-shaped window body and a frame having a thickness greater than the thickness of the window body along the peripheral edge of the window body. And the frame forming part has a wide flow path through which gas can flow in the resin, while the window main body forming part has a narrow flow path for preventing gas from entering the resin. Injecting molten transparent synthetic resin in an amount that integrally forms the frame and the frame portion having a hollow portion therein to form a frame portion in the frame forming portion of the cavity and a window body portion in the window body forming portion Before the resin injected into the cavity is solidified, high-pressure gas is injected into the resin of the frame forming portion and expanded along the frame portion, whereby only inside the frame portion along the longitudinal direction. Hollow Method for producing a synthetic resin window and forming a. 2. A transparent resin film or sheet having a hard coating on its surface is arranged in a cavity corresponding to a window body so that the hard coating side faces the mold surface, and a transparent synthetic resin is injected. 2. The method for manufacturing a synthetic resin window according to claim 1, wherein the sheet is laminated and integrated with the window main body. 3. The method for manufacturing a synthetic resin window according to claim 1, wherein a hard coating is formed on the window body after the mold is opened. 4. The synthetic resin made according to claim 1, wherein an opaque covering portion is formed on the surface of the frame portion after opening the mold, thereby shielding the hollow portion from being seen through from the outer surface side. Window manufacturing method.