JP2508756B2 - Manufacturing method of window glass with gasket - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a window glass with a gasket suitable for a window glass for automobiles and a window glass for construction, and particularly to a gasket wrap margin for covering a peripheral portion of the window glass. Relates to a manufacturing method when the front side and the back side of the window glass are different.

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

Conventionally, the attachment of the window glass with the gasket to the window frame has often been performed by the physical fixing method, but in recent years, the bonding method has been widely used. The adhesive method is easy to install,
The window frame and the gasket may have a simple structure.

FIG. 3 shows an example of a window glass attachment portion attached by an adhesive method. That is, the gasket 2 is attached to the peripheral portion of the window glass 1. Window frame 3
It has a mounting portion 3a that is bent stepwise toward the back side. Then, the window glass 1 is fitted into the mounting portion 3a via the gasket 2 and fixed by the adhesive 4. In many cases, the adhesive 4 is applied to the window glass 1 at the time of bonding.
A separator 5 called a dam or the like is provided between the window glass 1 and the window frame 3 so as not to flow toward the center of the window.

In the above mounting structure, when the window glass 1 is viewed from the front side, the mounting portion 3a of the window frame 3 on the back side of the window glass 1,
The appearance is better when the adhesive 4 and the dam 5 are not visible. Therefore, the gasket 2 that covers the front side 1a of the window glass 1
The length of the wrap 2a of the wrap, that is, the lap margin A is the window glass 1
The length of the wrap 2b of the gasket 2 covering the back side 1b of the wrap 2b, that is, the wrap margin B is formed to be longer, and the protruding portion of the wrap 2a hides the back side mounting portion.

Such a window glass with a gasket is manufactured, for example, by the method shown in FIG. That is, the molding die 6
The window glass 1 is placed in the molding die 6 such that the window glass 1 is sandwiched between the upper mold 7 and the lower mold 8. A cavity space 9 forming the gasket 2 is formed by the upper die 7, the lower die 8 and the peripheral portion of the window glass 1. In this state, a gasket material such as a melted material of rubber or elastomer or a raw material mixture capable of forming rubber or elastomer is injected into the cavity space 9, and the gasket material is solidified to form the gasket 2 integrally with the window glass 1. Then, the upper mold 7 and the lower mold 8 are opened, and the window glass 1 and the molded gasket 2 are taken out from the molding die 6. Examples of such a molding method include, for example, JP-A-57-158481, JP-A-58-73681, JP-A-58-110786, JP-A-60-4015, JP-A-60-104412, JP-A-60-63115, JP-A-61-79613, JP-A-61
-66645 publication and the like.

In the method of manufacturing a window glass with a gasket as described above, in order to prevent the gasket material from entering the contact surface between the window glass 1 and the molding die 6 to cause burrs or the like, the window glass 1 is considerably strong with the molding die 6. Need to hold down. However, in the gasket 2 as shown in FIG. 3, since the lap margin A of the wrap 2a is formed longer than the lap margin B of the wrap 2b, the portion 9a of the cavity space for forming the lap 2a is It extends longer in the central direction of the window glass 1 than the portion 9b of the cavity space for forming the wrap 2b. As a result, the upper mold 7 presses the inner side of the window glass 1 considerably, and the lower mold 8 presses the portion closer to the end edge of the window glass 1, so that the peripheral edge of the window glass 1 moves upward. The warp is likely to occur in the direction of the mold 7, and the warp is likely to be large due to the difference in the flow resistance of the gasket material. Therefore, the window glass 1 is apt to be significantly damaged due to the warp. In addition, a gap 10 is likely to be formed between the peripheral edge of the glass 1 and the lower mold 8, and the gasket material often enters the gap 10 during injection of the gasket material to cause burrs.

"Object of the Invention" An object of the present invention is to provide a method for manufacturing a window glass with a gasket having different lap margins on the front side and the back side of the window glass, in which damage to the glass and generation of burrs are prevented. It is in.

"Structure of the Invention" The present invention is a method for manufacturing a window glass with a gasket, in which a lap margin of a gasket covering a peripheral edge portion of the window glass is different between a front side and a back side of the window glass. When a gasket molding cavity space is formed in the peripheral portion of the window glass, a pressing member is interposed between the inner surface of the molding die that forms the longer lap in the cavity space and the facing surface of the window glass. By pressing the peripheral edge of the window glass against the holding surface of the mold that forms the shorter wrap margin, in this state, the gasket material is injected into the cavity space, and after the gasket material has solidified, the window glass and molded It is characterized in that the gasket is taken out of the mold.

[Operation] As described above, in the present invention, the pressing member is interposed between the inner surface of the mold forming the longer lap in the cavity space and the facing surface of the window glass, and the pressing member allows the peripheral edge of the window glass to be surrounded. Since the portion is pressed against the holding surface of the mold that forms the shorter lap, the peripheral edge of the window glass can be prevented from warping in the direction of the mold that forms the longer lap. As a result, the damage of the glass is reduced and the peripheral edge of the window glass and the holding surface of the mold for forming the shorter one of the lap are closely adhered to each other without a gap, so that the gasket material does not enter during injection, Burrs can be effectively prevented.

"Embodiment of the Invention" FIG. 1 shows an embodiment of a method for producing a window glass with a gasket according to the present invention. The window glass with a gasket to be manufactured is as shown in FIG. 3, and its structure will be described using the reference numerals in FIG.

As shown in FIG. 1, the window glass 1 is attached to the upper die 7 of the forming die 6.
And the lower mold 8 so as to be sandwiched therebetween. A cavity space 9 defined by the inner surface of the upper mold 7, the inner surface of the lower mold 8 and the peripheral portion of the window glass 1 is formed in the peripheral portion of the window glass 1. In the cavity space 9, there are a portion 9a forming the wrap 2a of the gasket 2 and a portion 9b forming the wrap 2b of the gasket 2. The portion 9a forming the wrap 2a extends longer in the center direction of the window glass 1 than the portion 9b forming the wrap 2b. For this reason, the holding surface 7a of the upper mold 7 presses the portion far from the edge of the window glass 1, and the holding surface 8a of the lower mold 8 holds the window glass 1
It holds down a part very close to the edge of the.

In the present invention, the pressing member is arranged between the inner surface of the upper mold 7 located in the portion 9a forming the wrap 2a in the cavity space 9 and the surface of the window glass 1 facing it. In this embodiment, the pin 11 is used as the pressing member.
The pin 11 has its head inserted and supported in a hole 12 formed in the inner surface of the upper mold 7, and its lower end projects into the cavity space 9 to press the surface of the window glass 1. As a result, the peripheral edge portion of the window glass 1 is prevented from warping in the direction of the upper mold 7, and closely adheres to the holding surface 8a of the lower mold 8. In this case, the protruding length of the pin 11 into the cavity space 9 is preferably the same as or slightly longer than the gap a between the inner surface of the upper mold 7 and the surface of the window glass 1 at that position. This is because if the protruding length of the pin 11 is shorter than the gap a, the pin 11 will not hold the window glass 1 sufficiently. In this state, the gasket material is injected into the cavity space 9 and solidified to mold the gasket 2. At this time, since the peripheral edge portion of the window glass 1 is in close contact with the holding surface 8a of the lower mold 8, the gasket material does not enter between them, and burr formation is prevented. Thus gasket 2
After forming, the upper mold 7 and the lower mold 8 are opened, and the window glass 1 and the gasket 2 are taken out from the molding die 6, whereby a window glass with a gasket can be obtained.

In the above, the material of the pin 11 is preferably an elastic body or a soft one in order to prevent the window glass 1 from being damaged.
For example, it is preferably made of rubber or a synthetic resin such as polyacetal or nylon. Also, the pin 11 has its head inserted into the hole 12 of the upper mold 7 and is held by frictional force,
After molding the gasket 2, the window glass 1 and the gasket 2
When taking out from the molding die 6, it is preferable that it be easily pulled out from the hole 12. In this case, the pin 11 having the lower end portion embedded in the gasket 2 may be left as it is for a product, or only the head protruding from the gasket 2 may be scraped off to obtain a product. May be used as a fixture for attaching the window glass 1 to the window frame. Further, the pin 11 is made of a member fixed to the upper mold 7, and after the gasket 2 is molded, the window glass 1
When removing the gasket 2 from the mold 6, the pin 11
May be extracted from the gasket 2 so that a hole remains in the gasket 2. This hole may be filled with a filler in a later step, and may be used as a mounting portion when mounting the window glass 1 on the window frame.

Furthermore, in the present invention, instead of the pin 11, a spacer may be arranged between the inner surface of the upper mold 7 and the surface of the window glass 1. The material of the spacer is preferably the same as that of the pin 11 described above, and any shape can be adopted as long as it does not hinder the injection of the gasket material. The spacer may be attached to the corresponding surface of the window glass 1 in advance. For the attachment, the spacer may be adhered to the surface of the window glass 1, or the spacer may be fitted to the edge portion of the window glass 1 by a structure such as a clip. This spacer is preferably embedded in the gasket 2 during injection of the gasket material.

The pressing member may be arranged at any place between the inner surface of the upper mold 7 located in the portion 9a forming the wrap 2a in the cavity space 9 and the surface of the window glass 1 facing it, but the present invention is preferable. In the embodiment, it is more preferable that the wrap 2a is arranged at a portion of the cavity space forming a portion projecting more than the wrap 2b, that is, at a portion C in FIG. When the window glass 1 is strongly pressed by the pressing member when the window glass 1 is arranged at the portion B in FIG. 1, bending stress may be applied to the window glass 1 and it may be damaged. However, even when it is arranged in the portion B, the effect of the present invention can be obtained without damaging the window glass 1 if the pressing force of the pressing member is maintained appropriately.

According to the present invention, when the length C obtained by subtracting the lap margin B of the shorter wrap 2b from the lap margin A of the longer lap 2a of the gasket 2 is preferably 5 mm or more, particularly preferably 10 mm or more, This is a suitable manufacturing method. That is, the window glass 1
The reason why the problem of the warp becomes large is that the length C is often 5 mm or more.

FIG. 2 shows another embodiment of the method for producing a window glass with a gasket according to the present invention.

This embodiment is substantially the same as the embodiment shown in FIG. 1, except that the head of the pin 11 is inserted into the hole 12 of the upper mold 7 via the spring 13 so that the pin 11 is covered with the window glass 1. Is different in that it is elastically biased in the direction of. As a result, an excessive pressing force is applied to the window glass 1 and the window glass 1
Can be prevented from being damaged. In this case, spring 13
It is also possible to use other elastic means such as rubber, or means such as pneumatic pressure or hydraulic pressure instead of.

In the present invention, the gasket 2 is made of synthetic resin, rubber or the like, and particularly preferably made of elastomer or soft synthetic resin. Further, as the gasket material injected into the molding die 6, a melt of synthetic resin or a fluid synthetic resin raw material mixture which reacts in the molding die to become a synthetic resin is used. 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 polyurethane-based elastomers, polyurethane-urea-based elastomers, polyurea-based elastomers, polyamide-based resins, epoxy resins, unsaturated polyester-based resins, and the like.
It is not limited to these. As the molding method, not only ordinary injection molding but reaction injection molding is preferable in the latter case.

Further, as the window glass 1 to which the present invention is applied, a normal glass sheet, a laminated glass obtained by bonding two glass sheets with an interlayer film such as polyvinyl butyral, a single glass sheet or a polyurethane resin on one surface of the laminated glass sheet. Various types of glass can be used, such as a laminated glass with a laminated sheet of polyester resin and two sheets of glass with a gap between them to seal the periphery and to fill dry air or nitrogen gas into the gap. . Further, these glasses may be air-cooled. Further, the present invention can be applied to various window glasses having a gasket, such as front, side, rear, window for sunroof, window glass for construction, etc. for automobiles.

[Advantages of the Invention] As described above, according to the present invention, the peripheral edge of the window glass is pressed by the pressing member against the holding surface of the forming die forming the shorter side of the lap so as to be in close contact. Therefore, the glass is less likely to be damaged during mold clamping and injection, and further, the gasket material does not enter between the window glass and the holding surface of the mold during injection, and burr can be prevented from occurring. Therefore, it is possible to manufacture a window glass with a gasket, in which the wrap margin is different between the front side and the back side of the window glass, with a good appearance.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a state in which a window glass is placed in a molding die in one embodiment of the present invention, and FIG. 2 is a portion showing a state in which a window glass is placed in a molding die in another embodiment of the present invention. Sectional view, FIG. 3 is a partial sectional view showing a state in which a window glass with a gasket is attached to a window frame, and FIG. 4 is a partial sectional view showing a state in which the window glass is placed in a molding die in the conventional method for producing a window glass with a gasket. It is a figure. In the figure, 1 is a window glass, 1a is a front side of the window glass, 1b is a back side of the window glass, 2 is a gasket, 2a is a longer wrap, 2b is a shorter one, 6 is a molding die, 7 is an upper die, 8 is the lower mold, 9
Is a cavity space, 11 is a pin, 12 is a hole, 13 is a spring, A is a longer lap allowance, and B is a shorter lap allowance.

Claims (5)

(57) [Claims] 1. A method of manufacturing a window glass with a gasket, wherein a lap margin of a gasket covering a peripheral edge portion of the window glass is different between a front side and a back side of the window glass. When forming the cavity space for gasket molding in the portion, a pressing member is interposed between the inner surface of the molding die that forms the longer lap in the cavity space and the facing surface of the window glass. The peripheral edge is pressed against the holding surface of the forming die that forms the shorter lap, and in this state the gasket material is injected into the cavity space, and after the gasket material has solidified, the window glass and the formed gasket are formed in the forming die. A method for manufacturing window glass with a gasket, which is characterized in that it is taken out from 2. The method for manufacturing a window glass with a gasket according to claim 1, wherein the pressing member is a pin whose one end is held by an inner surface of a mold forming the longer lap margin. 3. The method for manufacturing a window glass with a gasket according to claim 2, wherein the pin is an elastic body. 4. A method for manufacturing a window glass with a gasket according to claim 2, wherein the pin is biased in a protruding direction through an elastic means. 5. The pressing member according to any one of claims 1 to 4, wherein a longer lap length of the gasket forms a portion where a longer lap length of the gasket projects than a short lap length of the gasket. A method for manufacturing a window glass with a gasket in which is inserted.