JPH071588A - Manufacture of skin bonding sheet - Google Patents

Abstract

PURPOSE:To provide the manufacturing method of a skin bonding sheet, which can securely bond and mold a stitched cover and a pad without using a positioning pin and a positioning plate and does not yield a non-bonded part. CONSTITUTION:Stitching parts 4 of a bag-shaped stitched cover 1, which is formed by sticking a hot-melt film on the rear surface, is set on a plug 10, which is provided at a molding lower die 8 in the protruding shape, and sucked with vacuum. Thus, the stitched cover 1 is preformed in the shape of a product. A pad 2 undergoes contact bonding on the surface and is bonded and molded. The expanding length (b) of the roof part of the stitched cover is made shorter than expanding length of the roof part of the pad 2. Thus, the stitching legs of the stitched cover 1 can be made to fall in the specified direction at the time of preform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a skin adhesive sheet used as an automobile cushion.

[0002]

2. Description of the Related Art Among skin adhesive sheets used as cushions for automobiles, in the case of manufacturing a design having a deep groove at a parting position between a top plate portion and a top plate side portion, a bag-like sewing cover is used. It is necessary to match the sewn portions on both sides of the top plate with the deep groove of the pad and perform adhesive molding.

In such a case, conventionally, as shown in FIG. 4, a plug 22 having a positioning pin 21 on the surface of a molding die 20 is used.
The sewn cover 23 with these positioning pins
Positioning and fixing to the surface of the mold 20 using 21,
A method of adhering the pads (Japanese Patent Laid-Open No. 61-279278) has been adopted. However, there is a problem that it takes time to set the sewing cover 23 on the molding die 20 and the setting work is dangerous because of the positioning pin 21.

Further, as disclosed in Japanese Patent Application Laid-Open No. 2-257988, a positioning plate is sewn into a stitched portion of a sewing cover, and the sewing cover is aligned with a molding die by using this, and a pad is used. There is also proposed a method of adhesively molding. However, in this case, there is a drawback that the plate remains in the product and an uncomfortable feeling is generated, and there is a problem that a protrusion is formed in the deep groove.

Further, conventionally, since the adhesive is applied between the sewing cover and the pad, it is difficult to apply the adhesive to the deep groove of the pad well, and an unbonded portion is generated or the weight of the adhesive is only the groove. There were also problems such as increasing the number.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and simply and surely forms a sewn cover and a pad by adhesion without using the above-mentioned positioning pins and positioning plates. The present invention has been made to provide a method for producing a skin-adhesive sheet that does not require the drawing of the sutured portion into the groove and that does not have a risk of generating an unbonded portion.

[0007]

SUMMARY OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, has a bag-like sewing cover having a hot melt film adhered to the back surface thereof, and stitches on both sides of the top plate. At the time of adhesive molding with a pad having a deep groove at a position corresponding to, the sewing cover is preformed into the product shape by setting the sewing part of the sewing cover on the plug protruding from the molding lower die and vacuum suction. It is characterized in that a pad is pressure-bonded to the surface of the pad for adhesive molding.

[0008]

According to the present invention, a bag-shaped sewing cover having a hot melt film adhered on the back surface is placed on the lower molding die, and the stitched portion of the sewing cover is set on the plug protruding from the lower molding die. Then, the sewing cover is vacuum-sucked through the lower molding die. By this, the bag-shaped sewing cover is preformed into the product shape, but by forming the development length of the top plate portion of the sewing cover shorter than the development length of the top plate portion of the pad,
As will be shown in a later example, the sewing feet of the sewing cover can be tilted in a certain direction at the time of preforming, so that the hot melt film can be guided along the groove. Therefore, it is possible to prevent the unbonded portion from being generated. Thereafter, the pad is pressure-bonded from above the lower molding die, and the preformed sewing cover and the pad are adhesively molded. As described above, according to the present invention, the lower molding die having the protruding plug can be used to easily and reliably bond and sew the sewing cover and the pad.

[0009]

The present invention will be described below in more detail with reference to the illustrated embodiments. In FIG. 1, 1 is a bag-shaped sewing cover,
Reference numeral 2 is a pad that is adhesively molded with the sewing cover 1.
The pad 2 has deep grooves 3 and 3 on both sides of the top plate portion, and the sewing cover 1 also has sewn portions 4 and 4 at positions corresponding to the deep grooves 3 and 3 of the pad 2. As shown in an enlarged manner in FIG. 3, the sewing cover 1 of the embodiment is one in which the hot melt film 7 is attached to the back surface of the outer skin 5 with the slab urethane 6 interposed therebetween. The film 7 may be attached.

Reference numeral 8 is a lower molding die having a large number of through holes 9. On the surface of the lower molding die 8, plugs 10 and 10 are provided at positions corresponding to the deep grooves 3 and 3 of the pad 2. Then, the sewing cover 1 is set on the surface of the lower molding die 8 while aligning the sewn portions 4 and 4 of the sewing cover 1 with the plugs 10 and 10. Then, when vacuum suction is performed from the inside of the lower molding die 8, the sewing cover 1 is preformed along the surface of the lower molding die 8 as shown in FIG.

Further, as shown in FIG. 2, the development length b of the top plate portion of the sewing cover 1 is 10 times longer than the development length a of the top plate portion of the pad 2.
Sewing cover 1 can be made by making it short by about 15 mm.
The sewn portions 4 and 4 can be positioned inside the apexes of the plugs 10 and 10 of the lower molding die 8, and when vacuum suction is performed in this state, as shown in FIGS. The sewing foot of the cover 1 can be tilted in a certain direction (the direction of the center line of the product). Since the hot melt film 7 is attached to the back surface of the sewing cover 1 as described above, the sewing foot is securely fixed.

After the preform is completed in this way, the pad 2 set on the upper molding die 11 is lowered and the pad 2 is pressure-bonded to the preformed sewing cover 1. As a result, as shown in FIG. 3, the sewn portion 4 of the sewing cover 1,
4 can be accurately fitted into the deep grooves 3, 3 on both sides of the top plate portion of the pad 2. After that, the reduced pressure is released and a heat fluid is introduced from the injection hole 12 of the lower molding die 8 to melt the hot melt film 7 of the sewing cover 1 and perform adhesive molding with the pad 2. Through the above steps, a product (skin adhesive sheet) in which the sewing cover 1 and the pad 2 are adhesively molded can be obtained. If the outer periphery of the sewing cover 1 is fixed by a clamper 13 provided on the outer periphery of the lower molding die 8 after preforming as shown in FIG. 1, the position of the sewing cover 1 will not be displaced and the adhesive molding will be more accurate. Can be done.

[0013]

As described above, according to the method of manufacturing the skin adhesive sheet of the present invention, the sewing cover and the pad can be easily and surely removed without using the conventional positioning pins and positioning plates. It can be adhesively molded. Further, according to the present invention, since the bag-shaped sewn cover formed by sticking the hot melt film on the back surface is used, there is no fear of generating an unbonded portion even inside the deep groove, There is no need for retraction. Therefore, the present invention makes a great contribution to the industry as a method for producing a skin adhesive sheet that solves the conventional problems.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a relationship between a development length b of a top plate portion of a sewing cover and a development length a of a top plate portion of a pad.

FIG. 3 is an enlarged cross-sectional view of a main part of a skin adhesive sheet manufactured by the method of the present invention.

FIG. 4 is a cross-sectional view showing a method for manufacturing a conventional skin adhesive sheet.

[Explanation of symbols]

 1 Sewing cover 2 Pad 3 Deep groove 4 Engagement part 7 Hot melt film 8 Molding lower mold 10 Plug a Pad development length of pad top plate b Sewing cover development length of top plate part

Claims (2)

[Claims] 1. A bag-shaped sewing cover (1) having a hot melt film (7) adhered to the back surface thereof, and deep grooves (3) at positions corresponding to the stitching portions (4) on both sides of the top plate. Pad with
When adhesively molding with (2), set the sewn part (4) of the sewing cover (1) on the plug (10) protruding from the molding lower die (8) and suction the vacuum to sew the cover (1). ) Is preformed into a product shape, and the pad (2) is pressure-bonded to the surface of the product to form an adhesive sheet. 2. A preform is formed at the time of preforming by forming the development length (b) of the top plate portion of the sewing cover (1) shorter than the development length (a) of the top plate portion of the pad (2). 2. The method for manufacturing an adhesive skin sheet according to claim 1, wherein the sewing legs of the sewing cover (1) are tilted in a certain direction.