Method and apparatus for processing synthetic plastics film

Details Method and apparatus for processing synthetic plastics film Method and apparatus for processing synthetic plastics film

B - Operations, Transporting

31

B

18/1057, 18/1076

B31B 1/16 (2006.01) B26D 7/10 (2006.01) B26F 1/18 (2006.01) B31B 27/00 (2006.01)

Patent

CA 1104783

ABSTRACT OF THE DISCLOSURE A web of synthetic plastics film, having a series of panels separated by longitudinally spaced transverse zones of weakness extending across the width of the web. The zones of weakness are constituted by a series of heat-produced per- forations along the lengths of the zones. Adjacent perforations are separated by unperforated portions of the web. When the web is a double layer then the panels are in the form of bags, the layers being sealed at the sides of the bags at the per- forations in the zones of weakness. A machine for making the web, causes a web of synthetic plastics material to pass longitudinally past a transverse hot cutting and welding edge which cyclicly inter- sects the web at longitudinally spaced intervals. The hot cutting and welding edge has a series of interruptions along its length.

282215

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