B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/1030
B29D 7/14 (1980.01)
Patent
CA 1136367
ABSTRACT OF THE DISCLOSURE A process for compression rolling of thermoplastic sheet material such as polyethylene or polypropylene which involves passing the material between cylindrical rollers having surfaces constituted of lubricative material selected from the group consisting of polytetrafluoroethylene, polyamides, polycarbonates, polyacrylates, polymethacrylates, graphite and molybdenum sulfide, under boundary lubrication conditions to effect a reduction in the original thickness of the material of between about 5 and 95 percent in a single pass. The circumferential speed of the rollers is maintained essentially equal to the linear speed of the thermoplastic sheet material passing therebetween and the film rewind tension is maintained in the vicinity of the elastic limit of the material exiting from the rollers. The process is useful in that it can be carried out by continuous cold rolling, i.e., at ambient temperature.
385866
Jenks Richard H.
Kipp Egbert M.
Osler Hoskin & Harcourt Llp
Revere Copper And Brass Incorporated
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