LAMINATED FILM AND PACKAGING BAG EXCELLENT IN BOILING BURST RESISTANCE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To develop high burst resistance at a time of boiling treatment or retort treatment, especially, at a time of air-containing boiling treatment by setting a product of a deformation degree defined according to a specific formula by a precisely explained measuring method to a predetermined value or more. ;SOLUTION: In a laminated film wherein a sealant layer is formed on at least the single surface of a polymide base layer film through an adhesive layer, a product of a deformation degree defined according to formula I by a precisely explained measuring method is set to 1.22 or more. In the employed measuring method, at first, this laminated film is formed into a three-side sealed bag with an inner dimension of 130×130mm and the bag is filled with water 200cc and air 200cc to be hermetically sealed. Next, this hermetically sealed bag is boiled in hot water at 90°C for 30min and the inner dimension of the central part of the bag expanded into a balloon shape is measured and the product of the deformation degree of the bag is measured from the measured value according to the formula I. In a drawing, A and B are respectively longitudinal and lateral dimensions at a time of air-containing boiling and S is a seal part.;COPYRIGHT: (C)1997,JPO