Method of making internally cross-ribbed plastics material struc

Details Method of making internally cross-ribbed plastics material struc Method of making internally cross-ribbed plastics material struc

1983-07-01

1985-06-04

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

15624414, 264564, 264146, 264167, 2642092, 4253261, 425381, B29D 2304

Patent

active

045213682

ABSTRACT:
A unitary tubular product having an inner layer and an outer layer connected together by a bi-planar mesh formed of helical ribs bonded at their cross-over points is produced in a single coaxial tubular extrusion process, the structure being integrally or confluently extruded. The extruder die head has annular flow channels having closely-spaced die grooves.

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patent: 3464450 (1969-09-01), Steffenini
patent: 3478139 (1969-11-01), Martin et al.
patent: 3540078 (1970-11-01), Schultz
patent: 3560306 (1971-02-01), Nalle, Jr.
patent: 3758354 (1973-09-01), Sakurai et al.
patent: 3758370 (1973-09-01), Sakurai et al.

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