Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1975-12-09
1978-09-19
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
156167, 156172, 156173, 156175, 15624412, 264209, 4251331, B29F 310
Patent
active
041155025
ABSTRACT:
One or several strands of a material in plastic state are laid in pressure free fashion into an exposed exteriorly accessible circular exterior inlet channel of an extrusion die, while at least the diepart or dieparts, which define the inlet orifice are rotated so as to lay each strand generally helically in the channel, and a driving shear force is applied against the material in the inlet channel to advance the material towards the die orifice, from where it is extruded in form of a tubular film or a circular array of filamentituous elements. The driving shear force can be established by rollers or scrapers engaging with the inlet orifice, or by moving the two sides of the inlet orifice relative to each other preferably in connection with an internal vanes adapted to produce a pumping action, or by an inserted ring in the orifice.
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Daniel William J.
Thurlow Jeffery R.
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