公开(公告)号：US3625794A

公开(公告)日：1971-12-07

申请号：US3625794D

申请日：1969-07-15

申请人： KURARAY CO

发明人： ARIKAWA SHOICHI ,  HUJIWARA KOUICHI ,  IKARI KYOICHIRO ,  NISHIMATSU YUKIO

IPC分类号： B29C43/30 ,  B32B27/00

CPC分类号： B32B27/00 ,  B29C43/305

摘要： Laminated films are produced by conditioning a melt of a polyvinyl alcohol resin to a moisture content of 20 to 60 percent by weight and a temperature between 50* C. and 160* C., extruding said conditioned melt in the form of a thin film through a slit onto the surface of a roller, the roller surface temperature being adjusted to between room temperature and 100* C., passing the resulting film over at least one hot roller, and laminating said polyvinyl alcohol film with a protective film while the polyvinyl alcohol film has a moisture content of 5 to 40 percent by weight.