Plastic lockseam tubing and method for making

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

F - Mech Eng,Light,Heat,Weapons

16

L

26/155, 189/56

F16L 9/00 (2006.01)

Patent

CA 1245577

ABSTRACT OF THE DISCLOSURE 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).

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