Two-in-one sewing method and structure of double-layer zipper

Abstract

The present invention relates to a two-in-one sewing method and structure of a double-layer zipper, comprising two inner layer tapes and two surface layer tapes, and a first chain element corresponding to the inner layer cloth tapes and a second chain element corresponding to the surface layer cloth tapes. Chain teeth, and the inner belt is wider than the surface belt; take the following steps: S1, bend the end of the surface belt away from the rib to the side with the rib to form a lining strip on the surface of the surface belt; S2, fold the surface Place the cloth tape on the surface of the inner cloth tape for alignment, and pass the sewing needle through the lining strip, the surface cloth tape and the inner cloth tape in turn to lock the edge; S3, sew the first chain element and the second chain element respectively On the inner cloth tape and the outer cloth tape; it can avoid the dislocation, wrong teeth and other unfavorable phenomena that would occur in sewing double-layer zippers in the prior art, and it is convenient to sew on bags, with high structural strength.

Description

technical field [0001] The invention relates to the technical field of sewing technology of double-layer zippers, in particular to a two-in-one sewing method and structure of double-layer zippers. Background technique [0002] The existing zipper structures are various, and most of them are single-layer zipper structure and double-layer zipper structure. For the single-layer zipper, the structural strength is poor, and it is easy to be cut by sharp objects when it is used on luggage products. Separated, the safety performance is very low; for the double-layer zipper structure, its structural strength and safety performance have been improved. At the same time, the application of double-layer zipper is also to adjust the use space of the box and bag to a certain extent; the usual sewing effect is that the inner zipper tape is wider than the surface zipper cloth, so when only using the inner When the layer zipper is opened and closed, a certain amount of use space can be incr...

AI Technical Summary

Problems solved by technology

[0003] Based on the above-mentioned technical application background, when sewing double-layer zippers in the prior art, the inner layer zipper and the surface layer zipper are all sewn separately. The inner zipper is divided into left cloth tape and right cloth tape, and then mark or needle positioning on the bag respectively, and sew the left cloth tape and right cloth tape on the edge of the bag according to this positioning; similarly, Separate the surface zipper into left and right cloth tapes, sew them on the edge banding reserved on the other layer, and put zipper pullers on the surface zipper and the inner zipper; finally, on the seam of the surface zipper Putting on the tube of the bag is used to cover the suture position and suture line of the surface zipper, to a certain extent prevent the accidental breakage of the suture; but this sewing method has several major disadvantages: 1. Two layers need to be left at the position of the bag The reserved edge banding, while the inner fabric layer of the bag is fixed and not exposed, if it is only reserved for the double-layer zipper, it will affect the overall appearance of the bag, and the structural strength of the double-layer edge banding will decrease, and the pull resistance will decrease. 2. When the double-layer zipper is sewn, the alignment marks and positioning needles are prone to misalignment during the sewing process, that is to say, the respective coordinate tapes of the inner zipper and the surface zipper may be misaligned , the phenomenon of wrong teeth, and sewing the surface zipper after the inner zipper is sewn, it is easy to make the inner and surface zippers misaligned, so jamming and cracking often occur during use; based on this, the above-mentioned deficiencies in the prior art , there is an urgent need for a double-layer zipper that can be more convenient to use, improve the overall strength, and ensure smooth alignment and stability

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