Multi-layered foam heat-shrinkable tube

Details Multi-layered foam heat-shrinkable tube Multi-layered foam heat-shrinkable tube

1992-06-26

1995-04-11

Lesmes, George F.

Stock material or miscellaneous articles

Hollow or container type article

Shrinkable or shrunk

428 365, 4283173, 4283197, 4283199, 428343, 428344, 428354, 428356, B23B 712, B65B 5300, B29D 2200

Patent

active

054056659

ABSTRACT:
The invention relates to a multi-layer foam heat-shrinkable tube comprising a hot-melt adhesive layer as the innermost layer, at least one non-foam layer and at least one foam layer provided on an outside surface of the hot-melt adhesive layer. The invention also relates to a method for producing a multi-layer foam heat-shrinkable tube comprising extruding a hot-melt adhesive layer as the inner most layer, at least one non-foam layer, and at least one foam layer to form a multi-layer foam tube, heating and expanding the inner diameter of the multi-layer foam tube, and cooling the expanded multi-layer tube while an inner diameter of the tube at the expanded state is maintained. The non-foam layers and foam layers can be provided in any number and any order. The multi-layered foam heat-shrinkable tube easily adheres to and covers the surface of an article such as a metal pipe, a metal rod, or the like, and provides good heat and electrical insulation, corrosion resistance, water-resistance, and so on, to thereby protect the article. The tensile strength of the multi-layer foam heat-shrinkable tube is not lessened even if the foaming ratio of a foam layer is made high.

REFERENCES:
patent: 4033929 (1974-01-01), Stiles et al.
patent: 4168192 (1979-09-01), Nyberg
patent: 4181775 (1980-01-01), Corke
patent: 4450871 (1984-05-01), Sato et al.
patent: 4608284 (1986-08-01), Roales
patent: 4707388 (1987-11-01), Park et al.
patent: 4966805 (1990-10-01), Ezawa et al.

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