| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve water resistance and heat resistance by forming a vacuum airtight chamber by means of a wrapping material having a barrier member in which a cover layer containing water soluble high polymer and metal alkoxide, or its hydrolized matter is formed on a metal deposited layer of a polyester urethane resin application layer of a polyamide film. SOLUTION: A base material is a polyamide film 1 on whose at least one end a polyester urethane resin application layer 2 is formed. A metal oxide deposited layer 3 is formed on the application layer 2. A cover layer 4 which contains water soluble high polymer and metal alkoxide, or its hydrolized matter is formed on the deposited layer 3 to form a barrier member. Wrapping material having such the barrier member forms a vacuum airtight chamber. As the polyamide film 1, a two-axes drawn film (a drawing ratio: 3 or more) is preferable considering mechanical strength. The metal oxide deposited layer 3 is composed of oxides of silicon, aluminum, titunium, zirconium, tin, or its compound. The water-soluble high polymer is preferably a polyvinyl alcohol.</p> |
