| 摘要 |
<p>PROBLEM TO BE SOLVED: To minimize the effects being applied to the taste, the fragrance, the medicinal effect and the discoloration, etc., of a content in the packaging of a food, medicine and clothes by using an unstretched polyester for the sealant layer of a packaging bag made of a composite film. SOLUTION: For a composite sheet consisting of a film and/or a non-woven fabric, and a sealant layer, the sealant layer is made of an unstretched polyester. By doing so, the sealant with oil resistance and barrier property, and also with an excellent oxidation resistance, and which does not require a phenol antioxidant, is obtained, and in addition, a packaging bag of which the heat- sealing is easy, and which can withstand actual usage, can be obtained. In this case, the polyester is a polyester which contains 80% or higher of an ethylene-terephthalate unit, and especially, polyethylene-terephthalate is preferable. In addition, from the viewpoints of cost performance and recyclability, a packaging bag made of a composite film consisting of a polyester non-woven fabric and an unstretched polyester sealant layer, is most preferable.</p> |
