| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow an internal pressure which rises during heating and cooking to escape to prevent a packaging bag from breaking and deforming by providing an expected-to-open heat-bonding portion having a protrusion protruding toward a contents storage portion of the packaging bag within an easy-to-peel tape region and by forming, on the protrusion, a cutting blade or a notch passing through the packaging bag. SOLUTION: An easy-to-peel tape 2 is inserted between packaging materials 50 constituting a bag body of a packaging bag 1, while heat-bonding layers 21, 23 provided on both sides of a core layer 22 of the tape 2 and internal layers 51 of the packaging materials 50 are heat-bonded with each other, forming an expected-to-open heat-bonding portion 20 having an approximately trapezoidal protrusion. An approximately circular notch 3 is provided on the approximately trapezoidal protrusion of the heat-bonding portion 20. Other heat-bonding portions are rigidly heat-bonded. Thus, when the packaging bag 1 receiving food is heated for cooking, interlayer peeling between the core layer 22 and the heat-bonding layers 21, 23 of the approximately trapezoidal protrusion of the portion 20 reaches the notch 3 to allow an internal pressure to escape, and preventing the packaging bag 1 from breaking.</p> |
