DEEP DRAW PACKING METHOD AND FILM WITH SMALL SHRINKABILITY FOR DEEP DRAW PACKING

摘要

The present invention provides a deep draw packaging method including placing an object (C) in a concave container portion (1) formed through molding of a film with small shrinkability (A) having a residual thermal shrinkage rate at 100 DEG C of more than 0 and 15% or less, the film (A) being formed by stretching a film having deep draw moldability and then thermally relaxing the film, the film having a surface which is formed of a heat sealable material and to become the inner wall of the container portion; transferring the concave container portion (1) to a vacuum packaging apparatus (5); placing, on the concave container portion (1), a cover portion (2) formed of a film (B) which can be heat welded to the film with small shrinkability (A); thermally shrinking a side face portion (11) and a bottom face portion (12) of the concave container portion (1) by use of a concave portion heating/shrinking mold (6) such that the side face portion (11) and the bottom face portion (12) come into close contact with the object (C); and sealing an upper peripheral portion (13) of the concave container portion (1) with the film (B) through heating/sealing means (7). The method of the invention attains a close contact between the film and an object to be packed, preventing generation of wrinkles or vacant gaps. Moreover, less curling is generated at the seal portion. IMAGE