| 摘要 |
PROBLEM TO BE SOLVED: To provide a packaging material for filling a liquid excellent in bending pinhole resistance, impact resistance and aroma retention property.SOLUTION: In a packaging material for filling a liquid comprising a structure of a base material layer a barrier layer a sealant layer in this order from the outside, an OPBT-based film, which is composed of either a polybutylene terephthalate resin or a polyester-based resin composition obtained by blending a polyethylene terephthalate resin in an amount of 30 wt.% or less based on a polybutylene terephthalate resin, is used as a base material layer. The OPBT-based film is obtained by simultaneously biaxially stretching an unstretched master roll film, which is obtained by rapidly cooling at a cooling speed of 200°C/sec or more, by 2.7 to 4.0 times vertically and horizontally respectively immediately after the polybutylene terephthalate resin is melt extruded. |
