JPH0399832A - Preparation of stitched skin - Google Patents

Abstract

PURPOSE:To dispense with a seal material, to simplify manufacturing and to inexpensively obtain a stitched skin by a method wherein a groove part bending a skin into an almost U-shape is formed to the skin and the upper ends of the groove part are mutually stitched to provide a stitched part and, thereafter, the groove part is pressed and expanded to superpose the skin on the groove part and both ends thereof are stitched in the direction of the stitched part to form a superpo stitched part. CONSTITUTION:A skin 1 is composed of a soft vinyl chloride type thermoplatic material and a groove part 8 having an almost U-shape is formed to the skin 1 by vacuum molding or slush molding. Folds 9, 9 are formed by a mold in opposed relation to the midway parts of the groove part 8 so as to easily fold the skin 1. The upper ends of the groove part 8 are stitched by upper and lower yarns 3, 4 to form a stitched part 1a. The groove part 8 having the stitched part 1a are pressed and expanded and the folds 9, 9 are bent to superpose three skins one upon another and the insides becoming both sides thereof 1 - 2mm from the folds 9, are stitched in the stitched part 1a by upper and lower yarns 5, 6 to form superposed stitched parts 1b, 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a sewn skin used for automobile interior materials and the like.

[Conventional technology]

In recent years, due to the trend towards luxury products, there has been a desire for the use of genuine automobile interior parts, or expressions with more authentic windows, and the use of genuine sewn products for the outer skin of the pads around the dash boards is one such example. The method of expressing the so-called stitch pattern on the Tsutea skin was to transfer it from a mold by slush molding or scalpel vacuum forming, but in this method, the skin material and thread are made of the same material and the same color. There were complaints that real windows were missing.

On the other hand, if real leather or skin with real windows is actually sewn by hand, a more luxurious feel can be obtained, so the above-mentioned sewn products have been adopted in luxury cars, ignoring the price increase to some extent.

FIG. 7 is a perspective view of a main part of a pad using a sewn skin, and the skin 1 shown in the figure has conventionally been provided by the following process.

That is, as shown in FIG.
A v-shaped groove 10 is formed in a part of the groove. Next, as shown in FIG. 5, the upper ends of the groove portions 1O are stitched together using the upper thread 3 and the lower thread 4 to form a stitched portion IC.

Next, as shown in FIG. 6, the sealing material 7 is brought into contact with the protruding side of the groove 10 of the skin 1, and the skin 1 and the sealing material 7 are threaded onto the upper thread 5 on both sides of the binding portion 1c and in the same direction. It is manufactured by sewing together with a bobbin thread 6 to form overlapping seams 1d and ld.

By providing the overlapping seams 1d and ld, the overlapping seams 1c are protected from tearing due to tension, etc., and when foamed plastic, such as urethane foam, is foamed during pad molding, this protects the overlapping seams 1c from the seam opening. This is to prevent leakage and outflow.

[Problems to be Solved by the Invention] In the case of the above method described in the prior art, not only a sealing material is required in addition to the skin and thread (but also a sealing material is required when sewing the sealing material together with the skin). In order to securely position the material in the sewn part, it takes a lot of man-hours to temporarily fix it with double-sided tape, etc., which increases both material costs and manufacturing costs, which is uneconomical.

The object of the present invention is to provide a method for producing a sewn skin without the above-mentioned drawbacks.

[Means to solve the problem]

The present invention will be described with reference to FIGS. 1 to 3, which correspond to examples. A groove (8) bent in a U-shape is formed, the upper ends of the groove (8) are sewn together to form a seam seam (1a), and then the outer skin (1) is overlapped by spreading the groove (8), Sew both sides in the direction of the above seam seam part (1a) to form the overlap seam part (lb).
, (1b).

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 3.
FIG. 1 is an explanatory perspective view of the step of forming grooves of the skin according to the present invention, and 1 is a skin made of a soft vinyl chloride thermoplastic material, and the thickness of the skin 1 is 0.5 to 1.
Approximately 5 wa is sufficient, but from the viewpoint of strength and sewing process, 0.8
The most preferable value is around wm.

8 is a substantially U-shaped groove provided in the skin 1 by vacuum forming or slush forming. As the above-mentioned molding method, slush molding is preferable because of the ease of molding the groove part.
Further, 9.9 is a crease formed by a mold to face each other halfway within the groove 8 so that the skin 1 can be easily folded.

FIG. 2 is an explanatory perspective view of the step of stitching together the grooves shown in FIG. 1, in which the upper ends of the grooves 8 are stitched together using the needle thread 3 and the bobbin thread 4 to form the stitching section 1a.

FIG. 3 is an explanatory perspective view of the process of pushing out the grooves and sewing them in layers as shown in FIG. Then, 1 to 2 folds inside the crease 9.9 on both sides are sewn in the direction of the interlocking seam 1a using the upper thread 5 and the lower thread 6 to form overlapping seams 1b and lb. In addition, in this embodiment, creases 9 and 9 are formed in the groove 8 so that the groove 8 can be easily bent.
However, it is possible to overlap the three layers of the skin 1 by pushing out the groove 8.

The overlapping seams 1b, 1b described above protect the seam seams 1a from tension and the like, and also prevent foamed plastic, such as urethane foam, from leaking through the threads of the seam seams 1a during pad molding.

〔Effect of the invention〕

Since the present invention has the above-described configuration, it not only eliminates the need for a sealing material, but also simplifies manufacturing and provides the sewing skin at a low cost.

[Brief explanation of drawings]

FIG. 1 is an explanatory perspective view of the groove forming process in the present invention, FIG. 2 is an explanatory perspective view of the seaming process of the groove shown in FIG. 1,
FIG. 3 is an explanatory perspective view of the process of expanding the groove portion and overlapping stitching shown in FIG. 2. Fig. 4 is an explanatory perspective view of the conventional groove forming process;
The figure is an explanatory perspective view of the stitching process for the groove parts shown in Fig. 4, Fig. 6 is an explanatory perspective view of the overlapping stitching process of the skin and sealing material shown in Fig. FIG. 3 is a perspective view of the main parts of the pad. Explanation of symbols 1 - Outer skin 18 - - Layered seam part 1 b - 11 Layered seam part 1cm - Layered seam part ld - Layered seam part 2 - Foamed plastic 3 - Needle thread
4--Lower thread 5--Upper thread 6--Lower thread 7--Seal material 8--Groove 9-Fold line 10 Groove

Claims (1)

[Claims] 1. A method for manufacturing a sewn skin covering a foamed plastic, the method comprising: forming a groove in the skin where the skin is bent into a substantially U-shape;
The grooves are characterized in that the upper ends of the grooves are sewn together to form a seam seam, and then the skins are pushed apart to overlap, and both sides of the groove are sewn in the direction of the seam seam to form a seam seam. Method for manufacturing a sewn skin.