Heat-insulating tubing
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United States of America Patent
Stats
-
Jul 30, 1985
Grant Date -
N/A
app pub date -
May 24, 1982
filing date -
May 25, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tube is thermally insulated by helically wrapping a water-repelling spacer around the tube; longitudinally folding a paper ribbon carrying a separating medium around and onto the helical spacer; injecting a foaming material into the tube as it is being formed, and permitting the material to foam inside the folded ribbon; and further permitting the foam to cure and set. Subsequently, the ribbon is peeled off the foam and, preferably, a metal or metalized foil is wrapped around the exposed foam, which is followed by the extrusion of a thermoplastic, synthetic envelope onto the foam.
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Cited Art Landscape
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