B - Operations – Transporting – 31 – B
Patent
B - Operations, Transporting
31
B
93/60
B31B 1/60 (2006.01) B31F 1/00 (2006.01) B65H 45/08 (2006.01)
Patent
CA 1230769
ABSTRACT In the manufacture of packing containers from laminated material contact between the inner layer of the material and the contents is avoided by doubling up the cut edges present in the packing container. It has proved to be difficult to perform a secure folding and sealing of the folded edge without damage to the material, since the outer, water-tight layer of the material consists of very thin, heat-sensitive thermoplastics. In accordance with the invention this difficulty is overcome by carrying out the folding and sealing of the edge of the material web gradually whilst at the same time supplying heat or glue. By supplying the sealing-promoting agent as late as possible during the course of folding, damage to the material as well as to the folding arrangement is avoided.
414920
Corneliusson Henry
Glans Jan-Erik
Aktiebolaget Tetra Pak
Hewitt Neville S.
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