| 摘要 |
Parallelepipedic packing containers of the type used as non-returnable packages for milk, etc., are manufactured by the transverse sealing of a packing material tube filled with contents. On sealing and subsequent forming of the packages, on the one hand, sealing fins extending over the end walls of the packing container, on the other hand, triangular corner lugs located on the short sides of the end walls are obtained. The sealing fins as well as the corner lugs are folded down during the forming so as to lie against adjoining container walls. When the packing container is to be opened, one end of the one of the sealing fins is folded up from its folded-down position, whereupon the packing container can be opened in that the packing container material is torn up along a tearing indication running along the fin. The folding up of the fin as well as the subsequent tearing up are facilitated in accordance with the invention in that one of the fins is given a greater width at the end where the tearing indication is situated. At the same time the opposite end of the fin is made narrower so as to facilitate the folding down of the triangular corner lug located underneath the fin end. This special shape of the fin is achieved without any appreciable increase in cost or loss in material in that the cutting off of the material tube is carried out somewhat obliquely in relation to the transverse sealing zone.
|
