| 摘要 |
PROBLEM TO BE SOLVED: To provide a metallic slide fastener element capable of achieving high smoothness and uniform finishing of a part exposed outside, and capable of enhancing fixing strength to a fastener tape, and also provide efficient manufacturing method of the element. SOLUTION: A rectangular wire material (11) is arranged on a die (13) and is punched by a punch (12) for manufacturing the slide fastener element (1). At this time, a punch-side mouth or a circumferential edge (13a) of the die (13) is chamfered at a radius of 0.01-1.0 mm. A gap (T) between the punch (12) and the die (13) is 0-30μm. The obtained element (1) has a cut face having 80% or more of shearing face and less than 20% of fracture face. Thus, the element is suitable for a slide fastener attached to a high-grade article. COPYRIGHT: (C)2005,JPO&NCIPI |
