Method for producing zigzagged plastic strand and forming into m

Details Method for producing zigzagged plastic strand and forming into m Method for producing zigzagged plastic strand and forming into m

1988-02-17

1990-12-25

Wityshyn, Michael

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

24448, 24449, 83880, 83917, 21912169, 21912172, 264287, 264296, 156177, 156211, 156257, 1562728, B23K 2600, B29C 6508, B32B 3120

Patent

active

049800035

ABSTRACT:
U.S. Pat. No. 4,615,084 disclosed and claimed a method for making multiple-hook fasteners and the resulting multiple-hooks. A strand of stiffly flexible bendable settable polymeric plastic material is zig-zagged back and forth cross a centerline, with sharply doubled-back bends at each zig and zag. The present method enables the doubled-back bends in such a plastic monofilament to be shaped sharply by initially causing the strand to be nicked or scooped at predetermined intervals to predetermined depth and length by at least one laser beam. The pre-nicked strand is used by feeding it endwise at a predetermined feed rate into a zigzag station wherein it is confined and guided by side walls diverging in the downstream direction and appropriately configured to shape the pre-nicked strand into the desired zigzag configuration. In the zigzag station, its leading, i.e. downstream, portions are slowed down relative to the predetermined feed rate of its incoming, i.e. upstream, portions for causing it to become sharply bent back and forth at the pre-formed nicks thereby forming a sharply bent zigzag pattern ready for forming into multiple hook fastener media. The zigzagged strand of thermoplastic material is formed into hooks and the hooks are set by passing through a heated shaping zone and a cooled setting zone. The resulting formed hooks are in rows which can be bonded to a substrate in a wide variation of pitch settings and lateral spacings.

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