Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1997-09-25
1999-08-31
Kuhns, Allan R.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 466, 2642094, 264572, 425 4C, 425 721, 425130, 425325, B29C 4424, B29C 4790
Patent
active
059450487
ABSTRACT:
In a process for extruding polymer melts (25) to form hollow chamber sections (21) by pressing the polymer melt through a shaping tool (24) with an internal shaping mandrel (26) and by subsequently sizing and cooling the hollow chamber section strand in a sizing and cooling unit (31) it is provided for the sizing and cooling of the hollow chamber section strand to be carried out in the sizing and cooling unit under extrusion pressure. A device for carrying out this process is characterized in that shaping tool (24) and sizing and cooling unit (31) are rigidly connected to form a closed system so that the strand extrusion pressure prevailing in the shaping tool can be propagated into the sizing and cooling unit, and that the shaping mandrel (26) protrudes out of the shaping tool (24) into the sizing and cooling unit (31).
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Hoppin Ralph F.
Kuhns Allan R.
Lipsitz Barry R.
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