Thermally insulated tube
AssigneeKabel-und Metallwerke Gutehoffnungshutte Aktiengesellschaft
InventorsKlaus Bauermeister, Gerhard Ziemek, Bernd Eilhardt
Life of this patent
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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.
Claims5
Thermally insulated conduit system, comprising an inner tube, an outer tube arranged concentrically to the inner tube, and a spacer construction disposed in the space between the inner and outer tubes, the improvement for the spacer construction comprising:
- a high tensile strength ribbon, carrying outwardly tapering elements to define V-shaped notches between adjacent ones of the elements, the ribbon with elements being helically disposed in said space, the elements being made of a rigid foam of a polymer, the V-shaped notches being at least approximately aligned in axial direction to establish channels, the channels being also filled with foam.
Dependencies are inferred from the claim text.