Method for producing a thermoplastic tubular profile and internal cooling unit for such a method
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United States of America Patent
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Jun 15, 1999
Grant Date -
N/A
app pub date -
Jul 31, 1997
filing date -
Feb 1, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tubular profile made of thermoplastic material is formed by extrusion from an extruder. Downstream from the extruder, the tubular profile is cooled both externally and internally by an external cooling unit and an internal cooling unit mounted on the extruder. A tensile force is exerted on the cooled tubular profile downstream from the cooling units by a pulling device. When the extruder is set in operation to start the production of the tubular profile, the internal cooling unit is left out. When the pulling device applies the tensile force on the extruded and externally cooled tubular profile, the internal cooling unit is introduced into the tubular profile from the open end of the tubular profile and is mounted on the extruder.
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