B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1071
B29C 51/10 (2006.01) B29C 51/06 (2006.01) B29C 51/18 (2006.01) B29C 51/30 (2006.01) B29C 51/42 (2006.01)
Patent
CA 1206315
ABSTRACT OF THE DISCLOSURE Disclosed is a process for the production of a hollow article comprised of a biaxially oriented thermo- plastic resinous material, comprising the steps of heating a sheet of thermoplastic material to a temperature above the orientation temperature of the thermoplastic material; clamping an area of the heated thermoplastic sheet between a first mold half and a second mold half, the first mold half containing a pre-form mold surface having a configuration predeteremined to provide for a uniform wall thickness of the hollow article to be formed, the surface being at a temperature of the thermoplastic material, and the second mold half having a cavity which corresponds to the shape of the hollow article to be produced; forcing the heated thermoplastic sheet by pressure differential into the first mold half against the surface; maintaining the thermoplastic sheet in contact with the surface for a period of time sufficient to bring the thermoplastic sheet to its orientation temperature; and forcing the thermoplastic sheet into the second mold half by means of a pressure differential which is sufficient to cause the thermoplastic sheet to conform with the cavity in the second mold half to form a hollow article with a force sufficient to substantially, molecularly orient the thermoplastic material in both the longitudinal and lateral directions. The present invention also discloses apparatus for thermoforming hollow articles from a thermoplastic material, which apparatus includes a pre-form mold, a final mold, and a pressurized air system which utilizes six-way valving and a pressure surge system.
410813
Hahn Granville J.
Rutledge Raleigh N.
Cosden Technology Inc.
Gowling Lafleur Henderson Llp
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