Patent ID: 9102454
Filing Date: 2015-08-11
Classification: B26D,B26F,B31B,B32B,B65D,Y10T

Abstract:
1. A method of manufacturing a laminated packaging film having a re-closable opening feature, the method comprising: a. adhesively bonding an outer laminate structure to an inner laminate structure to form a laminated film, each of the outer and inner laminate structures comprising at least one layer of flexible material; b. forming 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 the step of forming the outer and inner score lines is carried out using a pair of contra-rotating die cylinders positioned opposite one another at a single station on opposite sides of the laminated film, one of the die cylinders being positioned for contact with the outer laminate structure and having a blade for forming the outer score line, the other die cylinder being arranged for contact with the inner laminate structure and having a blade for forming the inner score line; wherein the contra rotating dies are configured so as to press the outer and inner laminate structures together as part of the step of adhesively bonding the structures before the blades contact the outer and inner structures respectively to form the outer and inner score lines.