Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1991-06-14
1992-12-08
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
26433117, B29C 4782
Patent
active
051695871
ABSTRACT:
In a solid state extrusion process a semi-crystalline polymer billet in a pressure chamber is forced through a die at the end of the chamber, with the polymer passing through the die at a temperature between 30.degree. C. below the alpha-crystalline temperature and the melting point of the polymer to form an oriented polymer profile. The pressure chamber is heated to about 0.50-0.95 of the melting point of the polymer and the die is heated to about 0.65-1.2 of the melting point of the polymer, with the die preferably being heated to at least 5.degree. C. warmer than the billet. A haul off stress on the profile extruded from the die is maintained between at least 0.5 MPa and a maximum amount without plastic deformation of the extrudate to obtain an oriented profile having a cross-sectional area greater than 0.5 cm.sup.2 at an extrusion rate greater than 0.5 m/min.
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Symplastics Limited
Tentoni Leo B.
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