| 摘要 |
<p>PURPOSE: To achieve cost reduction and enhancement of operability by providing a non-oriented base layer comprising polyester and a heat seal layer comprising a specific copolyester and a specific olefin polymer. CONSTITUTION: The base layer 12 of a film 10 comprises non-oriented polyester. Pref., the base layer is constituted of polyester mixed with 1-5% of a polyolefin or a recently developed polyester resin mixed or not mixed with the polyolefin. A heat seal layer 12 is constituted of a mixture of about 50-80% copolyester and about 20-50% polyolefin. The olefin used in the heat seal layer 12 is not necessarily limited to the same kind as the olefin of the polyolefin used in the pref. base layer as an additive. By this constitution, cost reduction and the enhancement of operability can be achieved.</p> |
