Method and apparatus for producing bags in two rows with subsequent stacking, especially for the production of bags from flattened blown thermoplastic foil
AssigneeLemo Maschinenbau GmbH
InventorsArmin Meyer, Jakob Schneider
Life of this patent
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Abstract
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.
Claims12
A process for producing stacks of bags which comprises at least the steps of:
- (a) feeding a web having an upper foil layer and a lower foil layer along a bag-producing path in a feed direction and forming said web with at least one marking distinguishing a lateral position of said web on said path;
- (b) at a punching station forming said web with a pair of openings at least on opposite sides of a longitudinal axis of the web for each of a succession of pairs of bags to be produced;
- (c) separating said web into a succession of bag segments each corresponding to a pair of bags;
- (d) stacking said bag segments with pins at a stacker extending through said openings to form a segment stack;
- (e) longitudinally cutting through said stack to separate pads of said bags from one another;
- and
- (f) detecting said marking and automatically in response to detection of said marking laterally positioning said punching station transversely to said direction for laterally positioning said punching station independently of a lateral position of said web.
Dependencies are inferred from the claim text.