| 摘要 |
An object of the present invention is to: eliminate the need to provide a tool such as a pair of scissors for partly opening a packaging bag; and allow the packaging bag to be partly opened easily when it is heated in a microwave oven, based on an increase in internal pressure caused by vapors associated with heating. To attain this object, the present invention provides a packaging bag made using as a material a synthetic resin film adapted for a microwave oven, wherein a layer constituting an inner surface is formed of a blend of a straight chain low-density polyethylene resin and a polybutene-1 resin, and one of opposite heat sealed portions perpendicular to a film flowing direction has a portion with a smaller heat seal width at an appropriate position.
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