Ykk Corporation

Sakae Aimono

Kiyomasa Segawa

Masahiro Kusayama

Tatsumi Wakai

Shinji Imai

Masatoshi Shibaike

Toshiharu Wakashima

The invention provides a bottom end stop for a slide fastener having a sufficient strength and an excellent appearance, wherein bottom ends of fastener stringers provided with a first and a second member are inserted through shoulder mouths of a slider; the first and the second member slide along flanges of the slider respectively; while the first and the second member are rotated in the direction of approaching each other, coupling of a pair of coupling heads and coupling concave portions formed on opposing faces of the first and the second member can be carried out, also coupling of coupling heads and coupling concave portions can be carried out; and further, by setting the length of the second member having no engaging portion with a fastener element to be shorter than the length of the first member, rotation of the first and the second member can be carried out smoothly.

Bottom end stop for slide fastener

The present invention intends to provide a waterproof slide fastener in which a synthetic resin film is fused to a fastener tape in order to prevent a perforation phenomenon that the synthetic resin film does not exist locally. A laminated synthetic resin film composed of low melting point resin layer having melting point of, for example, 100&deg; C.-140&deg; C. and high melting point resin layer having melting point of, for example, 150&deg; C.-230&deg; C. is fused to a surface or both surfaces of a pair of the fastener tapes with the low melting point resin layer being in contact with and opposing the fastener tape by heating with pressure. Fastener elements are mounted onto a side edge of the fastener tape and the laminated synthetic resin film is formed so as to protrude outward from the side edge of the fastener tape and a center point of coupling of the fastener elements. Because the high melting point resin layer disposed on the surface of the fastener tape is not melted, no perforation phenomenon occurs. Further, because the laminated synthetic resin film protrudes from the side edge, waterproof function is secured.

Waterproof slide fastener and manufacturing method thereof

A core cord is inserted into coil-shaped fastener elements made of thermoplastic resin, and the fastener elements are sewn onto a fastener tape by multi-thread chain stitch. Yarn mainly made of thermally meltable synthetic fiber is used for looper thread of multi-thread chain stitch, while yarn of fiber which is not or less meltable is used for needle thread. Entangling points of the looper thread and the needle thread are disposed on the core cord. The looper thread is thermally melted to form melted portions where the looper thread and the needle thread entangle with each other at the entangling points. As a result, melted portions which have become monofilamentary are formed on the fastener elements or no sewing yarn is on the fastener elements due to thermal melting. Thus, there is no fear of cutting of the sewing yarn due to sliding of a slider and the slide fastener is abrasive resistant. The coil-shaped fastener elements is firmly attached to the fastener tape by using such thermally meltable looper thread.

Coil-type slide fastener

A synthetic resin monofilament being continuously supplied is intermittently stamped to form head portions as flattened protuberances bulging laterally. Then the stamped monofilament is bent at the head portions to form leg portions and turnover portions bridging the leg portions of adjacent head portions, forming an continous coupling element row. While the continous coupling element row is conveyed by a conveying section, the head portions are heated and softened by a heating section, and a head-portion shaping tool having arcuate recesses is brought into contact with the individual outwardly curved softened head portions to shape the external shape of each head portion into an arcuate shape.

Growing community of inventors

Toyama-ken, Japan

Sakae Aimono