B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 69/00 (2006.01) B29C 47/00 (2006.01) B29C 47/20 (2006.01) B29C 47/34 (2006.01) B29C 47/88 (2006.01) B29C 47/90 (2006.01) B29C 47/92 (2006.01)
Patent
CA 2105065
2105065 9216359 PCTABS00016 An open tube apparatus (10) and method for continuously producing a rotating elongate strip (12) of material are disclosed. An extrusion die (14) continuously extrudes flowable material to form an open tube (16) with a central longitudinal cavity (60) and a transport mechanism (28) includes a plurality of drive rollers (30) which engage and pull the tube downline. A driver (66) rotates the extrusion die and transport mechanism. A tube cutter (34) which is offset at an angle with respect to the downline direction and defines the open end of the tube, cuts the tube into a continuous elongate web of the desired width as the tube moves downline. An air seal (26) seals the tube cavity to prevent air from escaping through the open end of the cavity, and a tube pressurizer (110) controls air pressure in the central longitudinal cavity of the tube to expand the tube laterally outwardly.
Akselrod Anatoly
Berman Mark A.
Cysewski James B.
Lenius Steven J.
Louks John W.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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