Heat-shrinkable foam tube and method of manufacture

Details Heat-shrinkable foam tube and method of manufacture Heat-shrinkable foam tube and method of manufacture

1992-02-04

1994-02-22

Hornsby, Harvey C.

Pipes and tubular conduits

Distinct layers

521 87, 428332, B29C 6722, C08J 910

Patent

active

052878945

ABSTRACT:
A method of manufacturing a heat-shrinkable foam tube, wherein a two-layer tube, having a foaming agent outer layer and non-foaming inner layer, is extruded and heated simultaneously to activate the foaming agent. This process condenses the two steps of extruding and foaming into one step and results in a tube which can be manufactured to exact and consistent standards and be shrunk onto a pipe at a low temperature in a short period of time.

REFERENCES:
patent: 4049147 (1977-09-01), Stiles et al.
patent: 4298706 (1981-11-01), Ueno et al.
patent: 4373554 (1983-02-01), Cook
patent: 4911979 (1990-03-01), Nishimoto et al.
patent: 5069953 (1991-12-01), Kishikawa et al.
patent: 5071886 (1991-12-01), Aoshima et al.
patent: 5089352 (1992-02-01), Garland et al.

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