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Title:
METHODS AND INSTALLATIONS FOR PRODUCING A BIAXIALLY ORIENTED TUBE FROM THERMOPLASTIC MATERIAL
Document Type and Number:
WIPO Patent Application WO/2020/130835
Kind Code:
A3
Abstract:
A method for producing a biaxially oriented tube from thermoplastic material, wherein a tube in preform condition is extruded from thermoplastic material and is subjected to a temperature conditioning. Use is made of an expansion device and of a drawing device which is arranged downstream of the expansion device. The expansion device comprises a non-deformable expansion part and a run-on part located upstream of the expansion part and having an upstream sealing member. The expansion device comprises a first gas discharge duct having one or more first inlet ports in the exterior surface of the expansion device, a first inlet port being open or closed or partly closed dependent on whether or not the first inlet port is covered and closed, or partly closed, by the tube. A first gas volume is present between the expansion device and the tube, the first gas volume being limited at an upstream end thereof by sealing contact between the tube in preform condition and the upstream sealing member of the run-of part and a downstream end thereof by sealing engagement between the tube and at least a downstream portion of the expansion part, e.g. near or at the transition to the run-off part. A first gas flow is effected from a first gas supply source via the first gas supply duct and the one or more first gas outlet ports thereof into the first gas volume and the pressure of the gas in the first gas volume is used to cause gradual expansion of the tube already before the tube contacts the expansion part. The first gas flow is maintained at a gas pressure independent constant first gas flow rate.

Inventors:
RIJNHART NICOLAAS WILHELMUS HENDRIKUS (NL)
MEIER GERRIT LUCAS (NL)
Application Number:
PCT/NL2019/050871
Publication Date:
September 03, 2020
Filing Date:
December 20, 2019
Export Citation:
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Assignee:
RPFLOW R&D B V (NL)
International Classes:
B29C48/90; B29C48/09; B29C48/25; B29C48/355
Domestic Patent References:
WO2011049436A22011-04-28
WO2013151420A12013-10-10
WO2009049374A12009-04-23
WO1990002644A11990-03-22
Foreign References:
US6214283B12001-04-10
EP2404735A12012-01-11
Attorney, Agent or Firm:
BROOKHUIS, H.J.A. (NL)
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