B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/799
B29C 71/02 (2006.01) B29C 43/22 (2006.01) B29C 43/52 (2006.01) B29C 47/00 (2006.01)
Patent
CA 1159211
C-16-71-C010 APPLICATION FOR LETTERS PATENT FOR ROTARY FORMING OF ARTICLES - B ABSTRACT OF THE DISCLOSURE A method of continuously forming articles having a predetermined, varying cross sectional geometry which com- prises continuously introducing molten thermoplastic material from a die opening into a nip formed by opposing rotating rolls with at least one roll having a cooled, arcuate mold cavity in its surface contoured to correspond to each article cross sectional geometry thereby providing varying clearances in the nip, progressively successively arcuately forcing the mold cavity into shaping engagement with the molten thermoplastic material to mold the articles therefrom, maintaining the thermo- plastic material containing the articles in contact with one of the rolls after exiting the nip thereby forming a first, curved intermediate shape wherein the thermoplastic material is par-. tially set, immediately passing such shape over a cooled cylindrical surface to further yet not completely set the thermoplastic material and transpose the first shape into a second shape reversely configured from the first shape, dis- charging the second, shape from the cylindrical surf in a substantially planar direction to straighten such shape and transpose the articles into a substantially flat condition while continuing to set the thermoplastic material, and there- after separating the articles from the remainder of the thermoplastic material.
358407
Mcfadden Fincham
Solutia Inc.
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