| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a microwave heatable packaging bag preventing a leakage of content from a steam releasing means. <P>SOLUTION: The microwave heatable packaging bag 10 is formed in a bag shape by laminating synthetic resin films 11 constituted with a base layer and a sealant layer such that the sealant layers of the films are opposed, and heat adhering the sealant layers. The packaging bag includes a steam releasing means 40 provided in a portion or in proximity to the heat seal portion 12, through which steam is discharged at the time of microwave heating. The packaging bag also includes protruding portions 30 protruding outwardly in a flap shape by folding a portion of both the synthetic resin films, and communicating inside thereof with inside of the packaging bag. Each of the protruding portions 30 is disposed at a position closer to the steam releasing means 40. When an inside pressure is increased as the packaging bag is placed flat and heated with microwaves, the lower protruding portion 40 is expanded to move the steam releasing means 40 to a position higher than that at the time of non-heating. <P>COPYRIGHT: (C)2009,JPO&INPIT |
