An ultra-thin plastic steel zipper includes: a pair of zipper fabric belts; two sets of teeth, respectively distributed along a direction of the pair of zipper fabric belts and engaged onto an inner side of each zipper fabric belt; a zipper head; a pair of top stops; and a bottom stop; the upper surface and the lower surface of the tooth are composed of three surfaces comprising a flat surface, a tapered surface, and a vertical surface, both an upper surface and a lower surface of the tooth has a tapered structure from the tooth head to the tooth tail, the overall volume of the teeth is significantly reduced, and the thickness and volume of the central line of the fabric belt are reduced, the established appearance of the plastic steel zipper is improved.

A method for manufacturing a watertight zipper solves the problem of low watertight effect of the modern watertight zipper. The method includes producing a waterproof stringer tape and forming a waterproof layer by injection molding. The waterproof layer covers a lateral edge of the waterproof stringer tape and includes a plurality of recesses. The method for manufacturing the watertight zipper further includes forming an aperture in each of the plurality of recesses. The aperture extends through the waterproof layer and the waterproof stringer tape. The method for manufacturing the watertight zipper further includes forming a plurality of scoops in the plurality of recesses by injection molding.

A method for manufacturing a watertight zipper solves the problem of low watertight effect of the modern watertight zipper. The method includes producing a waterproof stringer tape and forming a waterproof layer by injection molding. The waterproof layer covers a lateral edge of the waterproof stringer tape and includes a plurality of recesses. The method for manufacturing the watertight zipper further includes forming an aperture in each of the plurality of recesses. The aperture extends through the waterproof layer and the waterproof stringer tape. The method for manufacturing the watertight zipper further includes forming a plurality of scoops in the plurality of recesses by injection molding.

Provided is a copper alloy fastener element which improves season cracking resistance by a means different from that of increasing a ratio of a phase. The copper alloy fastener element includes a copper-zinc alloy as a base material, the base material having: an apparent zinc content of from 34 to 38%; a dendrite structure; and a phase at a ratio of 10% or less.

An element is configured to be installed together with a tape to form a fastener stringer, and includes: a main body including an upper main body and a lower main body; an installing portion for installing the tape; a head; and a neck connecting the main body and the head, wherein at least one of the upper main body and the lower main body includes a convex portion and a base portion, the convex portion protrudes from the base portion and extends in the left-right direction at an intermediate position in the front-rear direction. An inclined portion inclined downward along the left-right direction is formed on at least one side of the head along the upper-lower direction, and protrusions extending in the front-rear direction are formed on both sides of the convex portion.

There is provided a side fastener chain. A plurality of elements are fixed on each of opposing edge portions of a pair of fastener tapes at a predetermined pitch. The elements include a base portion and a head portion. A ratio (Rt) of the sum dimension of a first partial thickness, which is measured from an upper surface of each element to an upper surfaces-side apex of the respective edge portion, and a second partial thickness, which is measured from a lower surface of the element to a lower surface-side apex of the edge portion, to a thickness of the element satisfies the following equation: 40%Rt. A ratio (Rtl) of the thickness of the element to the entire length of the element satisfies the following equation: 0<Rtl<60%.

There is provided a side fastener chain. A plurality of elements are fixed on each of opposing edge portions of a pair of fastener tapes at a predetermined pitch. The elements include a base portion and a head portion. A ratio (Rt) of the sum dimension of a first partial thickness, which is measured from an upper surface of each element to an upper surfaces-side apex of the respective edge portion, and a second partial thickness, which is measured from a lower surface of the element to a lower surface-side apex of the edge portion, to a thickness of the element satisfies the following equation: 40%Rt. A ratio (Rtl) of the thickness of the element to the entire length of the element satisfies the following equation: 0<Rtl<60%.

Aspects herein are directed to a releasable coupling device having a first housing structure than includes a temporary magnet and a second housing structure that includes a permanent magnet. The first housing structure is receivable by a receiving receptacle of the second housing structure. The releasable coupling device may be included as part of a slide fastener assembly having two slider tapes.

Aspects herein are directed to a releasable coupling device having a first housing structure than includes a temporary magnet and a second housing structure that includes a permanent magnet. The first housing structure is receivable by a receiving receptacle of the second housing structure. The releasable coupling device may be included as part of a slide fastener assembly having two slider tapes.

This method for producing a slide fastener stringer having a colored metal element involves: forming a plurality of slide fastener elements fabricated from a metal material; preliminarily performing a surface-roughening treatment on the elements; forming one or more corrosion resistance layers on one or more roughened surfaces of the elements; forming one or more coating layers for covering the corrosion resistance layers; and attaching the teeth to a tape.