| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a transparent biaxially stretched coextrusion sealable polyester film excellent in sealability, processability and optical characteristics. SOLUTION: The biaxially stretched coextrusion sealable polyester film consists of at least three layers, that is, a base layer, a sealable outer layer and other outer layer. The seal lowest temperature of the sealable outer layer is 110 deg.C or lower and the seal seam strength thereof is 1.3 N/15 mm or more. The surface roughness Ra of the sealable outer layer is 40 nm or less and the gas flow rate thereof is 300-4,000 sec. The coefficient of friction (CDF) of the other outer layer is 0.5 or less, the surface roughness Ra thereof is 40-150 nm and the gas flow rate thereof is 140 sec or less. The number Nc of projections per 1 mm2 on the surface of the other outer layer and the height (h) of the projections have a specific relation.</p> |
