Thermally insulated tube

Details Thermally insulated tube Thermally insulated tube

1979-08-13

1982-09-28

Schmidt, Frederick R.

Pipes and tubular conduits

Distinct layers

With intermediate insulation layer

138132, 138144, F16L 914

Patent

active

043513654

ABSTRACT:
A tube system, which includes an inner and a concentric outer tube, is provided with a spacer made by cutting oblique notches into a polyurethane foam layer on a paper ribbon and by helically wrapping the ribbon onto the inner tube, the oblique and tapered foam elements pointing inwardly or outwardly, but the notches are aligned to form axial ducts. After forming the outer tube about the spacer, these ducts are filled with material that foams in situ.

REFERENCES:
patent: 3559660 (1971-02-01), Rollins

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