Slide Fastener and Method of Producing Slide Fastener
AssigneeYKK Corporation
InventorsYasuhiko Matsuda, Yuichi Yamashita
Life of this patent
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Abstract
Provided is a slide fastener that has a flexible fastener tape, exhibits liquid-tightness, and can prevent a gap from being formed in a coupling portion, and a method of producing the slide fastener. An overlay material is formed on a front surface of a fastener tape so that the overlay material formed on a surface of a core member extends beyond a centerline in a front-rear thickness direction of a tape member. When a pair of fastener element rows engages with each other, a tip of an intermeshing head of a fastener element presses the overlay material formed on the opposite core members.
Claims5
A slide fastener including:
- a pair of left and right fastener tapes, each of which includes a tape member and in which a core member that is larger than the tape member is formed along a side edge of the tape member;
- a fastener element row in which a plurality of fastener elements is arranged at an equal interval along each of the core members;
- and
- a slider that is attached so as to be slidable along the pair of left and right fastener element rows so that the fastener elements disposed to face each other are engaged and disengaged, wherein:
- the fastener element includes an intermeshing head and a body portion that extends from the intermeshing head;
- when the pair of fastener element rows disposed to face each other engages with each other according to sliding of the slider, a tip of the intermeshing head comes into contact with the side edges of the opposing fastener tapes;
- an overlay material that has liquid-tightness and is elastically deformable is formed on an entire surface of one of front and rear surfaces of each of the fastener tapes closer to one surface side of the tape member and a surface of the core member continuous to the one surface side of the tape member;
- and
- the overlay material formed on the core member extends toward another surface side beyond a centerline in a front-rear thickness direction of the tape member.
A method of producing a slide fastener, including:
- a first step of forming an overlay material that has liquid-tightness and is elastically deformable on one surface side of front and rear surfaces of a pair of fastener tapes in which respective core members are separated so as to face each other, so as to extend between the pair of fastener tapes;
- a second step of inserting projecting portions between the core members from the one surface side of the pair of fastener tapes and cutting the overlay material between the core members;
- and
- a third step of injecting and molding a fastener element on each of the core members of the fastener tapes that are divided by cutting of the overlay material.
Dependencies are inferred from the claim text.