SHRINKABLE FILM PACKAGE WITH UNSEALING MEANS AND ITS PACKAGING METHOD

摘要

PURPOSE:To permit an easy opening of films after packaging by forming a strip of overlapping heat shrinkable film by partially slackening the film to thereby form a triple fold, fusing together such overlapping film folds completely or partially and forming a perforation along this overlapping film strip. CONSTITUTION:A heat shrinkable film 2 enclosing an article 3 is partially slackened and a triple fold is formed on this slackened area, thereby forming a strip of overlapping film 4 on the surface of a package. The three folds of this strip of overlapping film 4 are completely or partially fused together by a heat or ultrasonic sealing means. A perforation 5 is formed along the strip of overlapping film 4 simultaneously with or after the above sealing operation. In the former case, the straight fusion of the film along the strip of the overlapping strip 4 and the formation of parallel perforations 5 are effected on one or both sides of a straight fused part 6 in a simultaneous operation using a heater fitted with a perforation edge.