B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
B31B 23/00 (2006.01) B65B 59/02 (2006.01)
Patent
CA 2077295
1090-11 METHOD FOR MAKING, FILLING AND SEALING SACKS ABSTRACT The invention relates to a method for making, filling and sealing sacks or bags from a tubular film web of thermoplastic material preferably provided with side folds and printed in format print. The leading end of the tubular film web is provided with a transverse weld; a section constituting an open sack is cut off from the tubular film web; the sack is then filled; and the open end of the sack is sealed by a transverse weld. The invention seeks to provide a method where the sacks produced are always an appropriate size to be filled tight and full. It is provided that the length of the formed tubular web section is varied, corresponding to the filling level of the sack. After making the transverse weld forming the sack, the tubular film web is advanced up to a printed mark. The section constituting the sack is cut off by means of a separating cut without at the same time forming the transverse weld sealing the leading end of the tubular film web, then the web is again advanced by a comparatively short adjustable length, and the excess section of tubing is cut off and at the same time a transverse weld is formed.
Shapiro Cohen
Windmoller & Holscher
LandOfFree
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