| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat-sealed package which eliminates the need of use of the same heat seal resin layer for the bottom material and the lid material and allows re-sealing simply by press-crimping with fingers.SOLUTION: As one of a lid material or a bottom material of a package, a multi-layer film formed by laminating, in order, a surface resin layer (A), an adhesive resin layer (B), a release resin layer (C) and a heat seal resin layer (D) is used. The layer (B) is composed of a styrene thermoplastic elastomer of a peak temperature of the loss tangent of -35°C as the main ingredient, and the layer (D) is composed of a polyethylene adhesive resin having a Vicat softening point of 70-100°C, a weight average molecular weight peak value of 160,000-220,000 and a ratio of the weight average molecular weight to the number average molecular weight of 1.5-2.3 as the main ingredient.</p> |
