B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1066
B29C 57/10 (2006.01) B29C 51/08 (2006.01) B29C 51/42 (2006.01)
Patent
CA 1221217
ABSTRACT METHODS AND APPARATUS FOR FORMING TUBULAR CLOSED-ENDED ARTICLES OF THERMOFORMABLE POLYMER MATERIAL A tubular article with a closed end is formed from a thermoformable polymer material, e.g. a high molecular weight saturated linear polyester such as polyethylene terephthalate, by forcing a punch (21) through the plane of a pre-heated and clamped sheet (13) of the polymer, centrally within an annular die (10), so as to draw the sheet into tubular form without exerting compressive stresses on the sheet between the punch and die, the punch being maintained at a temperature below the glass transition temperature of the polymer, e.g. by passing cooling fluid through internal passages (16), and being moved at a speed of at least 1/2 metre per second to effect the drawing. The punch head (21) may be convex or concave to produce a shaped closed end on the article, e.g. for making a pressure-resistant container, and the punch may co-operate with a shaped movable anvil (201) at the end or at an intermediate point in its stroke. Replaceable annular spacers (24) can be used to adjust the point in the punch stroke at which it co-operates with the anvil.
449548
Dick David A.
Folland Rickworth
Smith Desmond P.
Staines Glyn
Fetherstonhaugh & Co.
Metal Box Plc
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