Process for making smooth plastic tubing

Details Process for making smooth plastic tubing Process for making smooth plastic tubing

1990-05-18

1992-04-07

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264571, 2642094, 2642106, 26421113, 264211, 264DIG78, 264101, B29C 4790, B29L 2322

Patent

active

051026112

ABSTRACT:
A process for forming plastic tubing which involves extruding a molten plastic composition through a die which produces an extended length of plastic tubing, passing the hot tubing through a vacuum sizing tube wherein the wall of the tubing is sized by being drawn to the wall of the sizing tube by a vacuum, and cooling the sized tubing so that the tubing will be self-supporting at normal ambient temperatures, wherein the plastic composition contains a phosphorus-containing additive in an amount sufficient to cause an improvement in the smoothness of the interior of said tubing.

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patent: 4829112 (1989-05-01), Ishil
patent: 4853426 (1989-08-01), Chatterjee

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