Forming deep molecularly oriented articles from high nitrile group containing polymers
Abstract
Abstract A METHOD OF FORMING ARTICLES HAVING RELATIVELY BALANCED MOLECUALR ORIENTATION FROM A SPECIAL TYPE OF THERMOPLASTIC SHEET COMPOSED OF AT LEAST 60 WEIGHT PERCENT OF A POLYMER FORMED FROM A NITRILE GROUP CONTAINING MONOMER, WHICH INCLUUDES FORCING THE THERMOPLASTIC BY MEANS OF A PLUG IN AN AXIAL DIRECTION AT A SHEET TEMPERATURE WHEREIN THE RANGE OF FROM ABOUT 311 TO 390*F., WHICH TEMPERATURE IS ABOUT THAT AT WHICH SUBSTANTIAL ORIENTATION OCCURS, IN ORDER TO PRATIALLY FORM THE ARTICLE WHILE MINIMIZING DEVELOPMENT OF AXIAL ORIENTATION, HOLDING THE THUS FOCED MATERIAL IN CONTACT WITH A SURFACE AT A TEMPERATURE OF FROM ABOUT 250 TO 310*F. TO REDUCE THE TEMPERATURE OF THE MATERIAL TO ORIENTATION TEMPERATURE AND THEN EXPANDING THE MATERIAL OUTWARDLY AGAINST THE WALLS OF A MOLD CAVITY TO OBTAIN RADIAL ORIENTATION AND FINISH FORM THE ARTICLE.
Inventors
- 👤 W Wolf
Bibliographic Details
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