VACUUM PACKAGING METHOD

摘要

VACUUM PACKAGING METHOD The invention relates to an improved vacuum packaging method which makes use of a novel laminated film as the packaging film. The laminated film is composed of a plastically deformable layer of a synthetic resin having a yield stress of more than 50 kg/cm2 at a temperature of 23.degree.C. and an elongation of less than 30% at the elastic limit at a shaping temperature of 50 to 180.degree.C, and an elastic layer of a synthetic resin having an elongation of more than 40% at the elastic limit at the shaping temperature. The film enables a tightly fitting package to be formed without any wrinkling or rupture, and without requiring a complicated procedure, equipment and apparatus.