Tetra Pak Developpement Sa

Anders R Rausing

Erling I Nilsson

E Ingvar Nilsson

The invention relates to a method for the manufacture by means of shrink-forming of a packing container of orientation-stretched laminate comprising polyester and aluminium foil, the laminate being formed to a tube (14) and subsequently being made to shrink over a mandrel (10,28) to the intended shape.

Arrangement for the manufacture of packing containers

Method for the manufacture of packing containers and an arrangement for

A method for joining together laminated material including layers of orientation-stretched polyester and glycol-modified polyester. A strand of molten glycol-modified polyester is applied to the laminated material along the joining area and the laminated material is pressed together while the strand is cooled. The laminated material is joined together by transferring heat from the molten strand to the pressed-on layers of the laminate. The surface portions of the layers are melted at the same time as the strand is cooled.

Extruded longitudinal joint

The invention relates to a method for the manufacture of packing containers. The container body of the packing container is manufactured by spiral winding of a monoaxially molecular-oriented polyester film. The polyester film is spirally wound onto a mandrel to form a tube with the edge zones of successive turns of the strip overlapping in a continuous joint. The material is sealed within the edge zones by means of surface fusion. The invention also relates to a packing container manufactured in accordance with the method.

Method of manufacture of packing containers and packing containers

A packing container having an outer casing and a package body disposed within the outer casing is disclosed. A wall portion of the package body is folded over and affixed to itself in the folded position, and a thin cutting thread is arranged within the folded wall portion so that the cutting thread is accessible from outside the packing container. Upon being pulled away from the wall portion, the cutting thread cuts through the wall portion to provide an opening in the package body.

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Lausanne, Switzerland

Anders R Rausing