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AssigneeYKK Corporation
InventorsTeruo Ozaki, Makoto Yoshida, Futoshi Kozato
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A metallic slide fastener element in which an exposed portion outside of an element is finished uniformly with a high smoothness and the fixing strength to a fastener tape is intensified, and a method for effectively manufacturing the same element, wherein a metallic flat type wire rod is placed on a die and the flat type wire rod is punched out with a punch so as to produce a slide fastener element, and at this time, a mouth on a punch side of the die or a peripheral edge of the die is chamfered at a radius of 0.01 to 1.0 mm and a clearance between the punch and the die is set to 0 to 30 μm, so that an element, which has a cut surface comprising a shear surface of 80% or more and a fracture surface of less than 20% and is suitable as a slide fastener to be attached to a high quality product, is obtained.
A slide fastener element manufactured by punching out a metallic flat type wire rod with a press, wherein at least a cut surface of a side face region comprising right and left side faces of a coupling head and an outside peripheral side faces of right and left leg portions has, as seen from a plan view, a shear surface of 80% or more and a fracture surface of less than 20%.
A method for manufacturing a slide fastener element by disposing a metallic flat type wire rod on a die and punching out the flat type wire rod with a punch, wherein a mouth on a punch side of the die or a peripheral edge of the die is chamfered at a radius of 0.01 to 1.0 mm, and a clearance between the punch and the die is 0 to 30 μm in order to punch out the flat type wire rod with the punch.
Dependencies are inferred from the claim text.