CS243872B1 - A method of treating the edges of parts, especially the shoe upper - Google Patents

Abstract

The purpose of the solution is to improve the method of treating the edges of parts, especially shoe uppers, which are cut from a laminated material, at least one layer of which is made of a foamed elastomer or plastomer. The stated purpose is achieved by sewing the edge of the part with a basting stitch and then providing it with a piping. The edge of one part, which is sewn with a basting stitch and provided with a piping, is placed on the edge of the other part, which is sewn with a basting stitch, and then the edges of both parts are sewn together. The solution can be used in treating the outer edges and joining parts of shoe uppers, haberdashery and clothing products made of material with a foamed insulating layer.

Description

BACKGROUND OF THE INVENTION The present invention relates to a method for treating the edges of parts, in particular of the shoe upper, which are die-cut from a laminate material of which at least one layer is formed from a foam elastomer or plastomer.

For cold, especially winter, lining is put into the upper of the shoe, which keeps the necessary warmth in the shoe and also ensures the necessary sorption of the foot vapors. The edges of the individual parts of the upper of these shoes must prevent the penetration of cold and possibly moisture. The edges of the parts that are lined with hem are well suited to this requirement.

Various laminate materials for making uppers of winter shoes are currently known which consist of an inner backing layer and a facing layer between which an insulating foam layer is interposed, eg of foam latex, expanded polyurethane and the like. The thickness of this foam insulating layer is limited by simultaneous technological processing in the manufacture of footwear, especially in the treatment of edges and joining of individual parts of the upper of the footwear.

With a greater thickness of the foam insulating layer, above about 5 mm, it is very difficult to sew a trim on the edge of such an upper part or to sew the two upper parts together by sewing.

In fact, when sewing, the presser foot is immersed considerably in the sewn material due to the squeezing of the foam insulating layer and thus disengages the feed mechanism of the sewing machine. Therefore, in the laminates used hitherto, the foam insulating layer has a thickness of up to 5 mm. The disadvantage of this solution is that in order to maintain sufficient heat and to ensure the necessary sorption of foot vapors in winter footwear it is necessary to provide the lining with these materials. This makes the production of shoe uppers very laborious and expensive.

This disadvantage is overcome by the method according to the invention, which consists in that the edge of the part is sewn with an overlock stitch and then provided with a trim. The edge of one piece that is sewn and trimmed is applied to the edge of the other part that is sewn, and then the edges of both parts are stitched.

A higher effect of the invention is that by stitching with an overlock stitch, the edge of the shoe upper part is reinforced and its thickness is reduced by compressing the foam insulating layer. The edged edges of the upper parts can then be easily trimmed and joined together even when the foam insulation layer has a thickness of 10 mm or more. The upper of the winter shoe made of a material with such a thickness of foam insulation layer provides sufficient thermal insulation and provides the necessary vapor sorption of the foot and it is not necessary to provide them with lining. This simplifies and speeds up the production of shoe uppers and reduces production costs.

FIG. 1 is an axonometric cross-sectional view of a shoe upper part with an edge stitched with an overlock stitch; FIG. axonometric cross-sectional view of two parts of the upper part with stitched edges.

The parts d1, d2 (FIG. 3) of the shoe upper are die-cut from a laminate consisting of an inner backing layer 11, 21, a facing layer 12, 22 and a foam insulating layer 13, 23 interposed therebetween. made of expanded polyurethane.

Example 1

The part d1 (FIG. 1) is sewn on the edge with an overlock stitch 14. This stiffens the edge parts of dl and its thickness is substantially reduced due to the compression of the foam insulating layer 22 · Then the edge parts of dl our trim 15 (Fig. 2) lemovaoími stitches 16, whose adjustment ^MZ edge portion terminates dl.

Example 2

The part d1 with the edge treated according to example 1 is applied to the edge of the second part d2 (FIG. 3), which is only sewn with the overlock stitch 24. The folded edges of the two parts d1, d2 are then stitched through two rows of connecting stitches 25, 26.

The invention can be used in the treatment of the outer edges and the joining of parts of the upper of the footwear, haberdashery and clothing articles made of foam insulating material.

Claims (2)

Method for treating the edges of parts, in particular of the shoe upper, which are die-cut from a laminate material, at least one layer of which is formed from a foam elastomer or plastomer, characterized in that the edge of the part is sewn over Method according to claim 1, characterized in that the edge of one of the parts which is sewn with the overlock stitch and provided with a trim is applied to the edge of the other part that is sewn with the overhead stitch, and then the edges of both parts are stitched.