Double strong zipper

Abstract

The invention discloses a double-layer strong-force zipper and zipper teeth of the zipper. The double-layer strong-force zipper comprises two pieces of zipper cloth, zipper tooth strips and a zipper head, wherein the zipper tooth strips are respectively sewed at the upper side surface and the lower side surface of the corresponding side edge parts of the two pieces of zipper cloth, and the zipper tooth strips respectively sewed at the upper side surface and the lower side surface of the corresponding side edge parts of the two pieces of zipper cloth realize the synchronous engagement or separation through the zipper head; the zipper tooth strips are long strips with a plurality of spiral coil-shaped zipper teeth and are formed by continuously coiling and winding the plastic strips, the zipper teeth comprise engaging parts and sewing parts, a recessed part with the W-shaped cross section is respectively arranged on each sewing part, the middle of each recessed part is respectively provided with a bulge projected in a direction from the groove bottom to the notch, and the recessed parts arranged at the two sides of the bulges respectively form a thread sewing groove. The bulges arranged in the recessed parts of the zipper teeth are embedded in the zipper cloth, so the zipper teeth are firmly fixed on the zipper cloth and cannot easily become loose, the recessed parts of the zipper tooth strip arranged at one side of the zipper cloth can also be arranged in the outward direction, sewing threads are positioned by the thread sewing grooves of the recessed part arranged in the outward direction, and the zipper cannot be easily damaged or cannot easily burst.

Description

technical field [0001] The invention relates to the technical field of slide fasteners, in particular to a double-layer strong slide fastener. Background technique [0002] Boxes and bags are used to load clothes, luggage and other daily necessities in our daily life, especially in travel, and the good closing effect of the zippers used in boxes and bags plays an important role in avoiding the loss of items in boxes and bags. to a vital role. Although the existing zipper has a high frequency of repeated opening and closing, the zipper is easy to wear and tear, especially when there are many objects in the box and bag and the zipper is tightened and during the handling of the box and bag, the zipper will be damaged. The strength requirement is relatively high. At this time, the zipper is very easy to be damaged and exploded, and the belongings in the box and bag are easily lost or stolen. [0003] For example, Chinese Utility Model Patent No. 201220335087.4 discloses a zipp...

AI Technical Summary

Problems solved by technology

However, only relying on the stitching effect of the suture thread between the sprocket teeth and the zipper tape chain cloth, the combination is still not tight enough, and it is easy to be stretched and the zipper is damaged or even burst open.

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