| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a dewatered sheet having a polyvinyl alcohol film which is excellent in water permeability, suppresses the occurrence of a pinhole, and prevents large swelling and contraction associated with water absorption. <P>SOLUTION: In a method for producing the dewatered sheet 10 with a substance 12 with a high osmotic pressure held between two films comprising at least one polyvinyl alcohol film 11, a polyvinyl alcohol film which is stretched after being extruded, heat-treated at 150-250°C, and treated with water is used as the polyvinyl alcohol film 11. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
