B - Operations – Transporting – 31 – C
Patent
B - Operations, Transporting
31
C
113/47
B31C 99/00 (2009.01) B29C 53/50 (2006.01) B29C 65/18 (2006.01) B29C 65/32 (2006.01)
Patent
CA 1322897
ABSTRACT OF THE DISCLOSURE A foil sheet comprising a plurality of layers is continuously rolled up around a shaft extending in its longitudinal direction to form a tubular body in such a manner that the two edges overlap. For welding, the overlapping edges are pressed together between two belts driven such that they rotate in the longitudinal direction. The inner belt traveling inside the tubular body has a longitudinal groove, which at least partly receives the area of the overlapping edges. The longitudinal groove shapes the inwardly oriented region of the seam of the tubular body and prevents plastic material that has been liquefied for welding purposes from stretching uncontrollably as a result of the pressing force. It is thereby assured that the material of both edges is welded completely together, so that there are no squeezed-out edge areas of liquid material that can prematurely cool down and as a result not bond properly to the layer of material facing them.
549260
Kmk Lizence Ltd.
Robic
LandOfFree
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