Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Of varying cross-sectional area or with intermittent...
Patent
1981-08-10
1983-05-31
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Of varying cross-sectional area or with intermittent...
264261, 2643288, 26432811, 26432812, 425545, 425572, 425575, 425376A, 425814, B29D 500
Patent
active
043860435
ABSTRACT:
A continuous zigzag-shaped coupling element strip, for use in the production of slide fasteners, is produced on a rotating die wheel having an endless zigzag-shaped peripheral cavity receptive of heated thermoplastic material delivered from a fixed extrusion nozzle. The cavity has a plurality of bottlenecks or retarding means to restrict or retard the flow of the delivered thermoplastic material in the cavity so as to retain much of the thermoplastic material in central and transverse cavity portions that correspond to head and leg portions of a coupling element.
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Thurlow Jeffery R.
Yoshida Kogyo K. K.
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