LINEARLY CUTTABLE POLYAMIDE LAMINATED FILM AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a linearly cuttable polyamide laminated film excellent in low hot water shrinkability, thickness precision or gas barrier properties and suitably used as a base material film of a packaging bag for food, chemicals, an industrial product, etc., and its manufacturing method. SOLUTION: The linearly cuttable polyamide laminated film comprises at least one layer (a) containing 55-79 mass% of an aliphatic polyamide polymer (A) and 21-45 mass% of an aromatic polyamide polymer (B) and at least one layer (b) containing 90-100 mass% of the aromatic polyamide polymer (B) and is characterized in that its linear cutting properties (the absolute value of shift quantity from a straight line when the straight line is drawn in the flow direction of the film and the film is torn over 200 mm) is 5.0 mm or below, the hot water shrinkage factor in the flow direction of the film at 95°C×5 min is 3.0% or below, the fluctuation ratio of the thickness in the width direction of the film is 10% or blow of the average thickness of the film and the oxygen permeability of the film under a 25°C×50% RH condition is 80 fmol/(m2×sec×Pa) or below. COPYRIGHT: (C)2007,JPO&INPIT