Back to results
US 5,287,894 AGranted
Heat-shrinkable foam tube and method of manufacture
AssigneeSumitomo Electric Industries, Ltd.
InventorsSatoshi Shukushima, Tomoyoshi Kishimoto
Life of this patent
Estimating the term…
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.
Claims3
A method of manufacturing a heat-shrinkable foam tube including the steps of:
- forming a tube having two-layers comprising a foam layer with foaming agent as an outer layer and a non-foam layer as an inner layer;
- extruding the tube while simultaneously activating and expanding the foam agent outer layer;
- thereafter
- cross-linking the foam tube;
- enlarging the diameter of the tube;
- and
- cooling and solidifying the tube.
4 more elements
Dependencies are inferred from the claim text.