| 摘要 |
<p>PURPOSE:To prevent occurrence of unsatisfactory appearance due to contraction by composing a vacuum adibatic material pack of a vessel which is prepared by vacuum- molding a plastic laminated film covering a core member, and a cover member which is made of a plastic-metal film laminated film, and making the difference not more than a specified ratio between the molding contraction ratios of the materials of the laminated film which compose the vessel. CONSTITUTION:A vacuum heat insulating material pack 1 is composed of a core member 2 made of an open cell hard urethane foam or the like, a vessel 4 made of a laminated film 3 having materials, differences between whose molding contraction ratios is not more than one percent, and a cover member 6 made of a plastic-metal film laminated film 5. Since the difference between the molding contraction ratios is not more than one percent, stress deflection applied to corner parts of the vessel which may caused by the difference of the contraction ratios is reduced, preventing deterioration of barrier performance owing to breakage of the laminated film. In an adibatic box 10, the molding contraction ratio of the vessel composing the vacuum adibatic material pack 1 is not more than one percent, so that stress deflection is small, the vessel is not deformed, and occurrence of unsatisfactory appearance due to contraction is prevented.</p> |
