B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
190/147
B65D 3/26 (2006.01) B65D 1/14 (2006.01) B65D 77/32 (2006.01)
Patent
CA 1094966
ABSTRACT OF THE DISCLOSURE Opening arrangements for packing containers are realized inter alia in the form of a portion of the wall of the packing container delimited by means of an opening indication line which portion is opened with the help of a tearing thread. The applica- tion of the tearing thread along a non-rectilinear opening indica- tion line is difficult and up to now it has not been possible to realize it automatically in the rapid manufacture of packing con- tainers from e.g. a moving material web. In accordance with the invention an opening arrangement is now provided wherein an open- able part of the container wall, limited by a curved opening indication line, is opened with the help of a tearing thread which extends rectilinearly between two points on the opening indication line. The tearing thread is applied so that on open- ing it follows and breaks up the material of the packing container along the curved opening indication line. The possibility of applying the thread rectilinearly makes the opening arrangement especially suitable for application in the manufacture of packing containers from a moving material web, since the thread can be applied at high speed parallel with the direction of the web.
330839
Marks & Clerk
Tetra Pak International Ab
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