| 摘要 |
<p>PROBLEM TO BE SOLVED: To specify a portion to be heated and unsealed at the time of heating and further make an easy-to-peel package unlikely to break due to external impact by forming an outer seal rim on a part of a heat seal in a recess and an inner seal rim to be linear and also constituting the package of a ply- separation multi-layered film. SOLUTION: At the time of heat-sealing, a recess (a) is provided on an outer seal rim of a heat seal, while an inner rim c-2 of the heat seal is left linear, whereby at a recess formed on an outer rim c-1 of the heat seal, a package may be reliably unsealed from a specific site due to an increase in internal pressure at the time of cooking with heat, while the package can be prevented from being broken due to impact when contents move at the inner rim c-2 of the heat seal. In addition, the number of recesses on the heat seal is preferably one, and it is preferable to make a back-lined seal bag as an easy-to-peel package. Thus a portion to be heated and unsealed can be specified, so that operativity and safety of a cook can be remarkably improved.</p> |
