PACKAGING

摘要

A packaging wrapper is made of material having inner and outer laminate structures bonded together. A peelable flap is defined in the wrapper by means of offset score lines in the laminate structures, the structures being bonded together in a marginal region between the score lines by means of a peelable adhesive. In one aspect of the invention, the score lines are formed using a pair of contra-rotating die cylinders positioned on opposite sides of the laminated film Each cylinder contacts a respective laminate structure and has a blade for forming a score line in that structure. In another aspect, the laminate structures are bonded together using a single peelable adhesive both within and outside of the marginal region. In a further aspect, the structures are not bonded together in at least part of the marginal region to provide a lifting tab for the flap.

主权项

1. Packaging comprising a wrapper of flexible laminated material having a re-closable opening feature, the wrapper comprising:
a. an outer laminate structure bonded by means of an adhesive to an inner laminate structure, each of the outer and inner laminate structures comprising at least one layer of flexible material; b. an outer score line through the thickness of the outer laminate structure and an inner score line through the thickness of the inner laminate structure, the outer score line delineating an outer opening portion of the outer structure that is separable from the remainder of the outer structure along the outer score line, the inner score line delineating an inner opening portion of the inner structure that is affixed to the outer opening portion by the adhesive and is separable from remainder of the inner structure along the inner score line, wherein at least part of a marginal region of the outer structure between the outer and inner score lines is attached to an underlying surface of the inner structure by the adhesive, the marginal region of the outer opening portion being peelable from the underlying surface of the inner structure so as to cause the inner opening portion to also be peeled back to create an opening in the laminated film, the marginal region of the outer structure being re-attachable to the underlying surface of the inner structure for re-closing the opening; in which a part of the marginal region of the outer structure is not bonded to the underlying inner structure to form a tab for the opening feature and a coating or surface treatment is applied to the outer surface of the tab to cause the tab to curl or lift away from the inner structure, characterized in that the coating or surface treatment comprises a shrink reactive varnish or a heat treatment surface layer.