FremgangsmÕte og innretning for samtidig fremstilling av to poser, sµrlig automatposer fra dobbeltfoliebaneavsnitt i en flattlagt slangefoliebane

摘要

A method of and an apparatus for producing stacks of bags where, instead of connecting the position of the foil web, a marking on the foil web is detected and used to correct the positions of the devices which operate on the web. These devices can include a cutter for removing a strip from the upper layer of the flattened blown tubular web, the punch for punching holes in the lower layer, and the device for infolding are among the devices controlled in response to the marking. The latter can be printed on the web as it is unrolled or formed during the extrusion or foil blowing process.