B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/00 (2006.01) B29C 47/86 (2006.01)
Patent
CA 2135485
2135485 9325372 PCTABS00028 A method and apparatus for continuously extruding a product, and forming it into a bend by applying a force (20) to it at a point of application downstream of where its surface becomes solid. The force has a transverse component relative to the die axis (18), and performs work upon the extruded material (5), extra to the work that has already been performed to extrude it. Non-contact means of applying the force are described, and various ram-type contacting means (33) are illustrated. Alternative means of operation are described in which the point of application of the force to the extrudate during bending varies relative both to the extrudate and to the die (4), relative to the extrudate only, and relative to the die only. Means to alter the direction of bending are described, and to diminish the necessary bending force by creating a fluctuating melt pressure within the die.
Allan Peter Stewart
Bartlett Christopher Dawson
Bevis Michael John
British Technology Group Limited
Btg International Limited
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