B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 51/00 (2006.01) B29C 47/12 (2006.01) B29C 47/92 (2006.01) B29C 51/14 (2006.01) B29C 51/18 (2006.01) B29C 51/22 (2006.01) B29C 51/42 (2006.01) B29C 71/00 (2006.01) B65D 1/34 (2006.01) C08J 5/00 (2006.01) C08L 67/02 (2006.01)
Patent
CA 2363861
A continuous process for making a thermoplastic article comprises extruding a sheet of thermoplastic and contacting the sheet with a mold surface while the sheet is in a substantially non-oriented state. The mold surface is selectively heated and/or cooled during thermoforming to maintain the sheet in a molten or thermoformable state. A stripper plate adjacent to the mold surface is maintained at different temperature for inducing a predetermined degree of crystallinity to the sheet, for increasing web stiffness and improving web alignment, and optionally for assisting in the separation of the articles from the mold. A continuous apparatus for making thermoformed articles has co-extruders for extruding at least two distinct layers, which can have dissimilar properties (e.g., polar and non-polar), and a temperature controlled molding surface. Preferred thermoplastic compositions of the present invention have improved toughness and retained intrinsic viscosity.
Apex Research Limited
Associated Packaging Enterprises Inc.
Smart & Biggar
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