Heat-insulating tubing

Details Heat-insulating tubing Heat-insulating tubing

1982-05-24

1985-07-30

Woo, Jay H.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156247, 138149, 138DIG9, 264 458, 264 459, 264 463, B32B 518, B32B 3114

Patent

active

045319910

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.

REFERENCES:
patent: 3459877 (1969-08-01), Bullock et al.
patent: 3615977 (1971-10-01), Lehnert et al.
patent: 4212917 (1980-07-01), Skowronski et al.
patent: 4261790 (1981-04-01), Brinker et al.
patent: 4327121 (1982-04-01), Gray, III
"Pipe Insulation--as Simple as Icing a Cake", Apr. 1977, Penfold and Dean, Process Engineering, pp. 79-80.

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