Row of continuous slide fastener coupling elements and method of making the same
AssigneeYoshida Kogyo K.K.
InventorsHiroshi Yoshida, Isao Hagiwara, Shigeyuki Oodera
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Abstract
A row of continuous slide fastener coupling elements is in the form of a filamentary coil or zigzag made of thermoplastic synthetic resin. Each coupling element includes a coupling head, a pair of legs extending from the coupling head, and a connector located remotely from the coupling head and extending between one of the legs and a leg of an adjacent coupling head. The connector is heat-set intensely by being heated concentratedly for increased dimensional stability. A method of manufacturing a row of such continuous slide fastener coupling elements includes the step of heating the connectors at a temperature close to the melting point of the monofilament.
Claims7
A method of manufacturing a row of continuous slide fastener coupling elements, comprising the steps of:
- (a) transporting and bending a monolfilament of thermosplastic synthetic resin successively into a plurality of continuous turns each including a coupling head, a pair of spaced legs extending from said coupling head, and a connector located remotely from said coupling head and extending between one of said legs and a leg of an adjacent coupling element;
- and
- (b) substantially during said bending, permanently heat-setting only each said connector at least at a surface layer thereof which faces away from said coupling head at a temperature slightly below the melting point of the monofilament, and while said turns are still being transported, providing said turns a temporary heat-set at a relatively low temperature, whereby the temporarily heat-set coupling heads are stabilized in pitch by the permanently heat-set connectors.
Dependencies are inferred from the claim text.