JPH0329569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a synthetic resin window glass, and more particularly to a method for manufacturing an organic window glass equipped with a weather strip for use in vehicle sunroofs and the like.

[Prior Art] A conventional method for manufacturing a synthetic resin window glass is shown in FIG. The conventional manufacturing method is as follows: (1) A substantially annular gasket 50 is sandwiched between the two template plates 20a, which are arranged so that a molding space 30 is formed therein, and the gasket 50 and the two templates are tightened using a tightening fitting 60. template 20
a and are fixed together. (2) Liquid casting resin is injected into the molding space 30 formed inside, and then the casting resin is polymerized and hardened to form the glass portion 40a. (3) Remove the clamping fitting 60 and the two template plates 20a. (4) Cut the peripheral part of the glass part 40a,
It is removed together with the surrounding gasket 50. (5) Form a weather strip 10a on the peripheral edge of the glass portion 40a.

A synthetic resin window glass 4a is manufactured through these steps.

[Problems to be Solved by the Invention] In the conventional synthetic resin window glass manufacturing method described above, the peripheral edge of the glass and the gasket 50 are removed, which is wasteful because they are disposable. However, the weather strip 1 had to be attached to the peripheral edge of the glass portion 40a by adhesion or insert molding in a separate process.
For this reason, traditional manufacturing methods require many work steps,
Further, the material yield of the glass portion 40a is poor, and the gasket 50 is also wasted, which is disadvantageous in terms of cost.

It is an object of the present invention to also provide a method for manufacturing synthetic resin window glass that solves the above-mentioned conventional problems.

[Means for Solving the Problems] The method for manufacturing a synthetic resin window glass of the present invention involves arranging two templates on both sides of the weather strip so as to sandwich the weather strip arranged in a substantially frame shape. A mold assembly process involves fixing the target and forming a molding space inside, an injection process injecting molding resin into the molding space, and polymerizing and hardening the injected molding resin to mold the glass part and molding the peripheral part. This method is characterized by comprising a molding step of molding the weather strip and the glass portion arranged in the mold, and a mold release step of releasing the synthetic resin window glass made of the glass portion and the weather strip from the template.

According to the present invention, the weather strip plays the role of a conventional gasket in the mold assembly process, and the glass part and the weather strip can be integrally connected and fixed during molding of the glass part. This eliminates the need for a molding gasket that is removed later, and also eliminates the step of fixing the weather strip to the glass portion.

The method for manufacturing a synthetic resin window glass of the present invention mainly includes a mold assembly process, an injection process, a molding process, and a mold release process.

In the mold assembly process, a weather strip arranged in a roughly frame shape is used instead of the conventional gasket, and two gaskets are placed on both sides of the weather strip to sandwich the weather strip.
Two templates are arranged and fixed together to form a molding space inside. Note that an opening is formed in a part of the weather strip, communicating with the molding space and serving as an inlet for casting resin, which will be described later. The two templates are used to mold both sides of the glass portion. As the template, a glass plate, a metal plate with a mirror surface, etc. can be used. Further, these templates can have any shape and curved surface depending on the shape of the glass part to be molded. Also 2
In order to keep the weather strip sandwiched between the two templates in a fixed state, it is preferable that conventional fasteners, etc. be placed at an appropriate distance around the periphery of the two templates. .

The weather strip has a base that is held between the templates,
The base may have a lip portion integrally formed on the outer peripheral surface side of the base, and the base may have an internal space for absorbing changes in length due to thermal deformation of the glass portion. Even if the casting resin injected into the molding space changes its volume within the molding space during polymerization and curing, or changes in length due to thermal expansion of the glass part, this internal space absorbs the change in length. death,
The dimensional accuracy of the entire synthetic resin window glass can be kept almost constant.

A frame may be provided at the base of the weather strip. In this case, the step of attaching the frame to the weather strip can be omitted. Further, it is effective to form screw holes or the like in the frame in advance when fixing the synthetic resin window glass to the body of a vehicle or the like later. The frame may be made of thermosetting resin such as epoxy or polyester, or metal such as aluminum.

The injection step is a step of injecting a casting resin into the molding space formed in the mold assembly step. The casting resin is preferably a partially polymerized syrup in which a polymerization catalyst (curing agent) is added. In other words, a polymerization catalyst (curing agent) is added to a liquid prepolymer, which is obtained by adding a small amount of catalyst to a resin monomer and heating it to partially polymerize it until it reaches an appropriate viscosity. It is preferable to use the added one. As the casting resin, monomers such as acrylic resins, polyester resins, and epoxy resins, or partially polymerized syrups thereof are used. Further, coloring materials such as dyes and pigments can be mixed into the casting resin. This allows the glass portion to be colored in any desired color.

The molding process is a process in which the casting resin injected into the molding space is polymerized and hardened, and at the same time, a glass part is formed to be connected and fixed to the weather strip arranged at the peripheral edge. The casting resin is subjected to a curing process such as thermal polymerization or photopolymerization while the two mold plates are filled with the casting resin. At the same time, a glass portion is formed within the two templates, and a weather strip is integrally connected and fixed to the peripheral edge of the glass portion.

The mold release step is a step in which the synthetic resin window glass formed by the molding step and consisting of the glass portion and weather strip is separated from the two templates.
In this case, the clamping fittings and two templates used in the mold assembly process are removed. After cleaning and drying, the two templates are used in the next mold assembly process.

[Operations and Effects] According to the method for manufacturing synthetic resin window glass of the present invention, the weather strip sandwiched between two templates plays the role of a conventional gasket and provides a sealing effect that seals the molding space. At the same time, the casting resin injected into the molding space polymerizes,
As it hardens, the weather strip and the glass portion are integrally connected and fixed. As a result, after forming the glass part as in the conventional method, the process involves separating the fixed gasket that has been glued to the periphery of the glass part, and attaching a new weather strip to the periphery of the glass part by gluing or insert molding. This process can be omitted. Furthermore, since the peripheral edge of the glass and the gasket, which were conventionally disposable, are not required, the material yield of the glass can be improved and the number of required parts can be reduced.

Therefore, according to the method for manufacturing a synthetic resin window glass of the present invention, the manufacturing process can be shortened when manufacturing a synthetic resin window glass having a weather strip that is integrally connected and fixed to the glass part.
It is possible to reduce the number of parts and reduce costs.

[Example] (First example) First example of the method for manufacturing a synthetic resin window glass of the present invention
An embodiment will be described based on FIGS. 1 and 2.

The method for manufacturing the synthetic resin window glass of the first embodiment will be described below.

The first embodiment of the present invention includes a mold assembly process, an injection process, a molding process, and a mold release process, which will be explained next.

In the mold assembly process, as shown in FIG. 2, two template plates 20 are placed on the weather strip 10, sandwiching the weather strip 10 arranged in a substantially frame shape, and a part of the template plate 20 is placed on the weather strip 10 at a position where the weather strip 10 is sandwiched. By arranging the fastening fittings 60 at appropriate intervals,
The mold plates 20 are tightened from the outer circumferential surface and fixed integrally to form a molding space 30 inside. Note that an opening (not shown) communicating with the molding space 30 is formed in a part of the weather strip, as in the conventional case. Here, the weather strip 10 is attached to the template 2.
The base 110 has a base 110 that is held between the glass parts 1 and 2, and a lip part 120 that is integrally formed on the outer peripheral surface of the base 110. The one with the shape is used. The internal space 111
The internal space 111 allows the polymerization of the casting resin in the molding space 30, the volume change (thermal contraction) of the casting resin during curing, or the change in length due to thermal expansion of the glass part due to sunlight, etc. can be absorbed,
A synthetic resin window glass 4 having constant product dimensions after molding can be obtained.

In the injection step, a casting resin is injected into the molding space 30 formed in the mold assembly step.
As the casting resin, a partially polymerized prepolymer syrup with a polymerization catalyst (curing agent such as benzoyl peroxide) added is used. Further, in this case, a coloring agent (pigment) may be mixed. The casting resin is injected into the molding space 30 through an opening (not shown) formed in a part of the weather strip 10, and a sufficient amount of the casting resin is injected into the molding space 30. Then, the weather strip 10 and the templates 20 are sealed with casting resin injected in such an amount that it overflows to the outside of the two templates 20. See Figure 2.2.

In the molding process, the molding space 30 is
The casting resin injected into the mold is polymerized and hardened. For this purpose, the mold plate 20 holding the casting resin inside is placed on the stand 70 shown in FIG. ℃) for 4 hours. This accelerates polymerization and curing of the casting resin. Thereafter, the pedestal 70 is transferred from the polymerization tank 80 into a heating furnace 90, and the casting resin is heat-treated at about 150°C for 2 hours, so that some unreacted (unpolymerized, uncured) parts in the polymerization tank 80 are removed. ) of the monomers are reliably reacted (polymerized, cured) and transformed into polymers. The polymerized and hardened casting resin is then removed from the peripheral portion 4.
A glass portion 40 to which a weather strip 10 is fixed is formed on the glass portion 10.

In the demolding process, the synthetic resin window glass 4, which has been polymerized and cured in the molding process and is composed of the glass part 40 and the weather strip 10 integrally fixed to the glass part 40, is removed by the clamping fittings 60 and 2. The template 20 is removed and separated from the template 20.
See Figure 2 3.

The synthetic resin window glass 4 manufactured through these steps can be used as a sunroof by being attached to a notch 51 in the roof portion 5 of a vehicle, as shown in FIG. 4, for example.

According to one embodiment of the present invention, the gasket that was conventionally used to maintain a sealed state of the molding space 30 in the mold plate 20 into which the casting resin is injected is no longer necessary, and the weather strip 10 is replaced with the conventional one. Since the weather strip 10 is integrally fixed to the glass part 40 when the casting resin polymerizes and hardens, the weather strip 10 acts as a gasket for the glass part 40 as in the conventional case.
The step of attaching the weather strip 10a around the glass portion 40a after forming the glass portion 40a can be omitted, and the number of steps can be reduced. These can significantly reduce costs in the mass production process.

(Second Example) Second example of the method for manufacturing synthetic resin window glass of the present invention
An example will be explained using FIG. 3.

A method of manufacturing a synthetic resin window glass according to the second embodiment will be described below. Note that explanations of the same configurations and functions as in the first embodiment will be omitted.

In the second embodiment, a frame-shaped frame 112 is provided on a base 110 corresponding to the vehicle mounting side of the weather strip 10. This frame 112 is integrally molded with the base 110 of the weather strip 10 in advance. The frame 112 is made of polyester (thermosetting resin).

In the case of the second embodiment, the weather strip 10
Since a frame 112 is provided on the base 110 of the frame 112, when the synthetic resin window glass 4 is used as a sunroof as shown in FIG. can.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the general steps of the method for manufacturing a synthetic resin window glass of the present invention. FIG. 2 is a longitudinal sectional view showing the manufacturing process of the synthetic resin window glass according to the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view showing the manufacturing process of a synthetic resin window glass according to a second embodiment of the present invention. FIG. 4 is a perspective view showing an example of the use of a synthetic resin window glass obtained according to an embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing a conventional method of manufacturing a synthetic resin window glass. 4... Synthetic resin window glass, 10... Weather strip, 110... Base, 111... Internal space, 112... Frame, 20... Two templates,
30...Molding space, 40...Glass part, 410
...Periphery.

Claims (1)

[Scope of Claims] 1. Mold assembly in which two template plates are arranged on both sides of the weather strip arranged in a substantially frame shape so as to sandwich the weather strip and are fixed integrally to form a molding space inside. a step of injecting a casting resin into the molding space; a step of polymerizing and hardening the injected casting resin to form a glass portion; and a step of forming a glass portion with the weather strip disposed on a peripheral edge thereof. A synthesis process characterized by comprising a molding step of integrating the glass portion and a mold release step of separating the synthetic resin window glass comprising the glass portion and the weather strip integrally fixed to the glass portion from the template. Method for manufacturing resin window glass. 2. The weather strip has a base portion that is held between the templates and a lip portion that is integrally formed on the outer peripheral surface of the base portion, and the base portion has a lip portion that absorbs the change in length due to thermal deformation of the glass portion. A method for manufacturing a synthetic resin window glass according to claim 1, which has an internal space. 2. The method of manufacturing a synthetic resin window glass according to claim 2, wherein a frame is provided at the base of the weather strip.