Device for extruding hollow strands

Details Device for extruding hollow strands Device for extruding hollow strands

B - Operations, Transporting

29

C

B29C 47/22 (2006.01)

Patent

CA 2606298

The invention relates to a device for extruding hollow strands from thermoplastic material, with an extrusion die (3) and a calibrating device (9), arranged between which is a mould chamber (20) with an outer mould body (24) for influencing the diameter of a hot, still mouldable hollow strand (5) emerging from an annular die (15) of the extrusion die (3). The object of the invention is to provide a device of this type for extruding hollow strands of thermoplastic material with which changing the wall thickness of the hollow strand emerging from the annular die is also possible. This object is achieved by the mould chamber (20) having an inner mould body (21), the inner and outer mould bodies (21; 24, 32) being arranged coaxially in relation to the annular die (15) and, by axial and/or radial adjustment in relation to each other, forming an annular gap (26) between them for changing the cross section and/or the wall thickness of the hollow strand (5) emerging from the annular die (15).

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