| 摘要 |
PROBLEM TO BE SOLVED: To provide a straight line-cuttable, heat-shrinkable, laminated polyamide film which has excellent straight line-cuttability, high hot water shrinkability, good thickness accuracy, and excellent gas-barrier properties and can appropriately be used as the base film of a packaging bag for food, chemicals, industrial products, etc. SOLUTION: The laminated film has at least a layer (a) containing 55-79 mass% of an aliphatic polyamide (A) and 21-45 mass% of an aromatic polyamide and at least a layer (b) containing 90-100 mass% of a gas-barrier resin (C). A straight line cuttability (the absolute value of dislocation from the straight line when a straight line is drawn in MD and torn in length 200 mm) is 5.0 mm or below. The hot water shrinkage rates at 95°C for 5 min in the flow direction (MD) and width direction (TD) of the film are at least 15%. The thickness fluctuation rate in the width direction (TD) of the film is 10% or below of the average thickness of the film. The oxygen permeability at 25°C in 50% RH of the film is 30 fmol/(m<SP>2</SP>s Pa) or below. COPYRIGHT: (C)2009,JPO&INPIT |
