Process of extrusion without distortion of extrudate
Abstract
Abstract A DOWNWARD EXTRUSION PROCESS OF A PLASTIC MATERIAL IN A CONTROLLED ENVIRONMENT WITHIN A FLUID-TIGHT CHAMBER TO PERMIT THE FORMING OF AN EXTRUDATE WITH A CROSS SECTION SUBSTANTIALLY IDENTICAL TO THAT OF THE DIE OPENING. PRESSURE IN THE CHAMBER IS CONTROLLED SO THAT THE WEIGHT OF THE EXTRUDATE APPLIES ESSENTIALLY NO TENSION TO PERMIT A DISTORTION-FREE EXTRUDATE THE LENGTH OF WHICH IS UNRESTRAINED EXCEPT BY THE LENGTH OF THE CHAMBER. THE FLUID IN THE FLUID-TIGHT CHAMBER COOLS THE EXTRUDATE SO THAT WHEN EXTRUSION IS DISCONTINUED, THE EXTRUDATE, AT ITS LOWER END, IS RELATIVELY RIGID. EXTRUDATES ARE MADE DISCONTINUOUSLY, REQUIRING OPENING OF THE CHAMBER OR SEPARATION OF THE CHAMBER FORM THE EXTRUDER BODY BEFORE THE EXTRUDATE IS REMOVED.
Inventors
- 👤 K Rosette
Bibliographic Details
Claims Analysis
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