PACKAGING BAG

Japanese Patent JP3923645

B2

PROBLEM TO BE SOLVED: To discharge automatically vapor pressure generated during cooking and prevent burst and deformation of a packaging bag, by forming in the fold start part of a V-shaped-cross-section-having fold part a overhang part heat- bonded projectingly toward the leading end of he fold part, and by forming a cutting edge or notch in the overhang part.
SOLUTION: A packaging bag 1 is formed from a laminate body 50 comprising an outer layer 53 and an inner layer 51 being a heat-bond-properties-having resin layer that is easily peelable. In the case, two fold parts 4 and 5, each folded in the shape of a latter V, are formed between the front-face part 2 and the rear-face part 3 so that their leading ends face each other. Also, the edges of the side-face parts of the front-face part 2 and rear-face part 3 and the edges of a bottom-face part are heat bonded to produce the gusset-type packaging bag having heat bond parts 6-8 nearly in the shape of a letter U. And in the vicinity of the middle of the heat bond part 8, with the fold part, out of the heat bond part 6-8, a nearly-semicircular overhang part 9 heat-bonded toward the leading end of the fold part 5 from the inside of the peripheral edge of the heat bond part 8 is formed, and a nearly circular notch 10 is made in the area of the overhang part 9.

Shinichi Nagata
Hidehiko Masaki
Tetsuhiro Yamamoto

JP6430698A

June 06, 2007

February 26, 1998

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Dai Nippon Printing Co.,Ltd.

B65D81/34; B65D33/01; B65D75/62; (IPC1-7): B65D81/34; B65D33/01; B65D75/62

JP3078784U
JP9150864A
JP4010079U
JP2108861U
JP5058670U
JP3040956U
JP55016214U
JP9267868A
JP10101154A
JP10175678A

US3937396

Satoshi Kanayama

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