Patent ID: 7237371

Claim:
A deep draw packaging method comprising: placing an object (C) in a concave container portion ( 1 ) formed through molding of a film with small shrinkability (A) having a residual heat shrinkage rate at 100° C. of 1 to 15%, the film (A) being formed by stretching a film having deep draw moldability at 80 to 95° C. with an extension ratio of 2.5 to 4.0 times in a machine direction (MD) and with an extension ratio of 2.5 to 4.0 times in a transverse direction (TD), and then shrinking the film at 70 to 98° C. by 10 to 40% in the MD and by 10 to 40% in the TD, the film having a surface which is formed of a heat sealable material becomes an 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 ).