Kabel-und Metallwerke Gutehoffnungshuette Ag

Ingo H Pahl

Gerhard B Ziemek

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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Hagen, Germany

Ingo H Pahl