| 摘要 |
PURPOSE:To obtain a packaging bag having little variation of gas-permeability and improved peeling strength of laminate, by forming a packaging bag with a material produced by laminating a gas-permeable sheet and a plastic sheet and opening holes exclusively on the plastic film layer of the resultant composite sheet. CONSTITUTION:A composite sheet is produced by laminating and bonding a gas-permeable sheet to a plastic film and irradiating the plastic film layer with a laser beam to open holes exclusively on the plastic film layer. The obtained composite sheet is used in at least a part or total of a packaging material for the objective packaging bag containing a disoxidation agent filled and packaged therein. The gas-permeable sheet is used as a part of the packaging material to prevent the escape of the disoxidation agent powder filled in the packaging bag and to separate the disoxidation agent from food, etc. The sheet has gas-permeability in itself and e.g. paper or nonwoven cloth. |
