B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/535
B29C 49/08 (2006.01) B29C 47/92 (2006.01) B29C 49/18 (2006.01) B29C 49/68 (2006.01) B29C 49/78 (2006.01) B29C 55/28 (2006.01)
Patent
CA 2030843
ABSTRACT PROCESS OF CONTROLLING THE FILM THICKNESS OF BLOW-FORMED AND AXIALLY AND PREFERABLY BIAXIALLY STRETCHED TUBULAR FILMS Tubular films made in an extruding and blow-forming plant are collapsed and are subsequently axially and preferably biaxially stretched in that they are re-inflated to form an inflated tubular film or expanded to form a tubular film. That inflated or expanded tubular film is then moved through an oven, from which the film is withdrawn and re-collapsed while moving at a velocity which is higher than the feeding speed in accordance with the desired stretching ratio. In order to ensure that the stretched tubular films have a substantially uniform thickness distribution throughout their periphery, the film thickness of the stretched tubular film which has emerged from the oven is measured around the tubular film before or after it has been collapsed and in dependence on the thus measured thicknesses of the peripheral profile the thickness distribution around the peripheral profile of the tubular film formed in the extruding and blow-forming plant is so controlled that any deviation from the average film thickness of the film which has been stretched in the oven, which deviation has been caused by a non-uniform heating of the film and possibly to other disturbing influences exerted on the film in the oven, will substantially be compensated.
Feistkorn Werner
Voss Klaus-Peter
Feistkorn Werner
Marks & Clerk
Voss Klaus-Peter
Windmoller & Holscher
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