Plastic lockseam tubing and method for making

Details Plastic lockseam tubing and method for making Plastic lockseam tubing and method for making

1986-11-19

1988-03-29

Basinger, Sherman D.

Ships

Boats, boat component, or attachment

Hull construction

114292, 138129, 138154, B63B 524

Patent

active

047336293

ABSTRACT:
A thin-walled large diameter spiral plastic tube with interlocking helical seams made from a strip of polyethylene material. The strip of plastic has a thin configuration with edge constructions providing a bead formation along one edge and a groove formation along the opposite edge, which can enable an interlocked helical seam, in the spiral tube. The strip is fed into a special spiral pipe making machine for plastics which winds and interlocks the edges of the strip. Such tubing is used for ducts and pipes and, filled with expanded polystyrene beads can be used very advantageously as flotation devices. The plastic used in the strips is polyethylene, including medium and high density polyethylenes with high molecular weight (HMW).

REFERENCES:
patent: 2713381 (1955-07-01), Seck
patent: 3199541 (1965-08-01), Richitelli
patent: 3446172 (1969-05-01), Morton et al.
patent: 3606670 (1971-09-01), Wienand et al.
patent: 4062380 (1977-12-01), Hofle
patent: 4566496 (1986-01-01), Menzel et al.

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