| 摘要 |
<p>PURPOSE:To improve stretching film-forming properties by forming a laminated film consisting of a layer composed of a mixture of a polyamide resin and a saponified ethylene/vinyl acetate copolymer and a layer containing the saponified ethylene/vinyl acetate copolymer. CONSTITUTION:A resin mixture (A) is obtained by mixing 65-85wt.% of a polyamide resin with 15-35wt.% of a saponified ethylene/vinyl acetate copolymer. Separately, a resin (B) containing at least 55wt.% of the saponified ethylene/ vinyl acetate copolymer is obtained. Then, at least two layers of the layer of the resin mixture (A) and the layer of the resin (B) are laminated to each other so that the layer (A) becomes thicker than the layer (B) and subjected to co-extrusion to be formed into a tubular shape. Subsequently, the film is heated to 75-100 deg.C to be biaxially stretched by 1.3-3.5 times respectively in longitudinal and lateral directions to prepare a heat-shrinkable laminated film.</p> |
