Hoechst Aktiengesellschaft

Georg Stangl

Heinz-Erhardt Andersen

Extruder with blow head comprising a cylindrical body containing at least one rotating screw in coaxial position, a feeding device for the thermoplastic material near one end of the cylinder and a blow head comprising a housing and a mandrel at the other end of the cylinder forming a slit tapering in the direction of flow of the plasticized material and through which said material issues, the screw and the blow head being arranged in one plane, and directly behind the blow head a cooling device for cooling the extruded tube, wherein

Extruder with blow head

The cooling device consists of a plurality of cooling elements which are arranged in such a manner that they surround the tubular sheeting without interspace. Cooling elements with plane inner surface alternate with cooling elements with curved inner surface, the plane surfaces and the projections of the curved surfaces each have the shape of a regular trapezoid. The cooling elements can be adjusted to the diameter of the tubular sheeting in transverse as well as in oblique direction with respect to the axis of the hollow space formed by the cooling elements.

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Munich, Georgia

Georg Stangl