A durable nylon zip fastener is formed from a pull and two chains. A chain is formed from chain teeth joined to a cloth tape by means of sewing thread. The pull comprises an upper wing plate and a lower wing plate, the upper wing plate and the lower wing plate being connected together by means of a support core therebetween, forming an accommodation cavity permitting the chains to pass through. The accommodation cavity is provided with two guide inlet openings near a support core end, used to guide in each of the two chains. Another end of the accommodation chamber is provided with a meshing exit opening, used to guide out the two meshed chains. The upper wing plate comprises an upper plate body holding the chain teeth from above and an upper flange part holding the chain teeth from two sides.

A watertight fastener includes a pair of fastener tapes; fastener elements provided on a side of one end edge part along a longitudinal direction of the fastener tapes; and a slider engaging and disengaging the fastener elements. On a surface of the fastener tapes opposite to the fastener elements, a waterproof seal layer is provided along the longitudinal direction at a position at which the fastener elements are provided. A width of the waterproof seal layer in a direction orthogonal to the longitudinal direction is narrower than a width of the slider. With the pair of fastener tapes being closed by engagement of the fastener elements, end parts of the waterproof seal layer close to the end edge parts of the fastener tapes come into contact with each other without overlapping in a thickness direction and without a gap to be in close contact in a liquid-tight manner.

A waterproof fastener chain includes: a pair of fastener tapes made of polyester resin adjacent to each other at a given space between each side edge thereof, rows of elements respectively attached onto a main surface of the side edge of each of the fastener tapes, and waterproof coated films made of polyester resin respectively formed on a main surface of each of the fastener tapes. An outer surface of each of the waterproof coated films is flat at least at a position where a slider is to pass over, each of the waterproof coated films penetrates into irregularities on the main surface of each of the fastener tapes, a penetration depth of the waterproof coated films into a gap caused by the space of the pair of fastener tapes is not more than thickness of the fastener tapes.

A coil-shaped fastener element is sewn to a fastener tape without using a core string. An upper leg portion of the fastener element has a first upper surface continued from a connecting portion and contacting a sewing thread, and a second upper surface extending and sloping upward from the first upper surface via a bent portion. A height dimension between a top end surface and the bent portion of the upper leg portion is 20% or larger of a height dimension of the fastener element. The upper leg portion has a first lower surface which is sloped to be apart from the fastener tape toward a coupling head portion, and the upper leg portion has an element contacting portion in an area of the first lower surface. Thereby, cost reduction of the slide fastener can be attained, and the fastener element can be prevented from passing through the sewing thread and exiting.

A coil-shaped fastener element is sewn to a fastener tape without using a core string. An upper leg portion of the fastener element has a first upper surface continued from a connecting portion and contacting a sewing thread, and a second upper surface extending and sloping upward from the first upper surface via a bent portion. A height dimension between a top end surface and the bent portion of the upper leg portion is 20% or larger of a height dimension of the fastener element. The upper leg portion has a first lower surface which is sloped to be apart from the fastener tape toward a coupling head portion, and the upper leg portion has an element contacting portion in an area of the first lower surface. Thereby, cost reduction of the slide fastener can be attained, and the fastener element can be prevented from passing through the sewing thread and exiting.

A fastener tape includes a mounting part for mounting a fastener element and a sewing part for sewing a fabric. The mutually adjoining sides of the mounting part and sewing part are integrally connected to each other. Another side of the mounting part which is spaced distantly from the sewing part provides a fastener element mounting side for mounting the fastener element. The sewing part is constituted of a plain weave texture.

According to various implementations, a flame-resistant and heat-resistant fastener chain includes a pair of left and right fastener tapes and a pair of left and right continuous fastener elements. Each fastener tape includes a facing tape side edge that faces the facing tape side edge of the other fastener tape. The left continuous fastener element is coupled to the left fastener tape adjacent the facing tape side edge of the left fastener tape and the right continuous fastener element is coupled to the right fastener tape adjacent the facing tape side edge of the right fastener tape. Each continuous fastener element includes a coiled monofilament that includes a high temperature polymer. In some implementations, the continuous fastener element includes a cord around which the coiled monofilament is wrapped.

According to various implementations, a flame-resistant and heat-resistant fastener chain includes a pair of left and right fastener tapes and a pair of left and right continuous fastener elements. Each fastener tape includes a facing tape side edge that faces the facing tape side edge of the other fastener tape. The left continuous fastener element is coupled to the left fastener tape adjacent the facing tape side edge of the left fastener tape and the right continuous fastener element is coupled to the right fastener tape adjacent the facing tape side edge of the right fastener tape. Each continuous fastener element includes a coiled monofilament that includes a high temperature polymer. In some implementations, the continuous fastener element includes a cord around which the coiled monofilament is wrapped.

A coil-shaped fastener element is sewn to a fastener tape without using a core string. An upper leg portion of the fastener element has a first upper surface continued from a connecting portion and contacting a sewing thread, and a second upper surface extending and sloping upward from the first upper surface via a bent portion. A height dimension between a top end surface and the bent portion of the upper leg portion is 20% or larger of a height dimension of the fastener element. The upper leg portion has a first lower surface which is sloped to be apart from the fastener tape toward a coupling head portion, and the upper leg portion has an element contacting portion in an area of the first lower surface. Thereby, cost reduction of the slide fastener can be attained, and the fastener element can be prevented from passing through the sewing thread and exiting.

A coil-shaped fastener element is sewn to a fastener tape without using a core string. An upper leg portion of the fastener element has a first upper surface continued from a connecting portion and contacting a sewing thread, and a second upper surface extending and sloping upward from the first upper surface via a bent portion. A height dimension between a top end surface and the bent portion of the upper leg portion is 20% or larger of a height dimension of the fastener element. The upper leg portion has a first lower surface which is sloped to be apart from the fastener tape toward a coupling head portion, and the upper leg portion has an element contacting portion in an area of the first lower surface. Thereby, cost reduction of the slide fastener can be attained, and the fastener element can be prevented from passing through the sewing thread and exiting.