Device for extruding hollow strands

Details Device for extruding hollow strands Device for extruding hollow strands

B - Operations, Transporting

29

C

B29C 47/88 (2006.01)

Patent

CA 2607469

The present invention relates to a device for extruding hollow strands from thermoplastic material, with an extruder head (3), having a mandrel (22), and a calibrating device (9), for making a dimensional change while production is in progress, and with a radially adjustable inlet (19), at least one Ranque vortex chamber (23) being formed in the mandrel (22), the cooling air outlet (25) of which chamber leads into a cooling tube (33), which extends as an axial extension of the mandrel (22) through the inlet (19) of the calibrating device (9) and has a cooling air outlet (34) opening out into the calibrating device (9). This invention achieves the object of providing a device with which effective interior cooling is achieved in calibrating devices designed for making a dimensional change while operation is in progress.

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