Multi-skin annularly ribbed tube

Details Multi-skin annularly ribbed tube Multi-skin annularly ribbed tube

1992-07-30

1994-06-28

Robinson, Ellis P.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 369, 428 3691, 428158, 428163, 138121, 138149, 138DIG9, B27N 502

Patent

active

053245571

ABSTRACT:
Annularly ribbed tube comprises one or more coaxial co-extruded inner layers and a coaxial outer layer of thermoplastic material. The tube has sharply upstanding annular or helical ribs having a width which is small in comparison to distance between annular ribs or between turns of the helix. At least one of the inner layers of extrudate fills a hollow outer shell of each rib which is formed by the outer layer. An innermost layer may be a smooth inner skin or may have a smooth inner wall and another wall which bulges into the rib cavity.

REFERENCES:
patent: 3858615 (1975-01-01), Weigl
patent: 4226580 (1980-10-01), Lupke
patent: 4305703 (1981-12-01), Lupke
patent: 4312383 (1982-01-01), Kleykamp
patent: 4500284 (1985-02-01), Lupke
patent: 4510013 (1985-04-01), Lupke
patent: 4534923 (1985-08-01), Lupke
patent: 4575400 (1986-03-01), Ueda et al.
patent: 4789589 (1988-12-01), Baxter
patent: 5048572 (1991-09-01), Levine

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