公开(公告)号：EP1240000B1

公开(公告)日：2004-02-04

申请号：EP00980753.8

申请日：2000-11-21

申请人： 3M Innovative Properties Company

发明人： DENKER, Martin, E. ,  BARTUSIAK, Joseph, T. ,  FERGUSON, Anthony, B. ,  HANSCHEN, Thomas, P. ,  JACKSON, Jeffrey, N. ,  MERRILL, William, W. ,  NEWHOUSE, Susan, J. ,  ROSKA, Fred, J. ,  THOMPSON, Richard, J. ,  WONG, Chiu, Ping

IPC分类号： B29C55/16

CPC分类号： B29C55/165

摘要： A method of stretching films in which all or a portion of the width of the film is cooled during or just after stretching so as to improve the uniformity of the film. The method includes stretching a polymeric film (26) in a tenter (10) that grasps the film with a plurality of clips (22, 24) along the opposing edges of the film (26) and propels the clips (22, 24) to thereby stretch the film. The tenter (10) includes driven clips (22) and idler clips (24), with at least one idler clip (24) between respective pairs of driven clips (22). The cooling is done so as to improve the uniformity of the clip spacing relative to the spacing obtained at otherwise identical process conditions without such cooling.

公开(公告)号：EP1240000A1

公开(公告)日：2002-09-18

申请号：EP00980753.8

申请日：2000-11-21

申请人： 3M Innovative Properties Company

发明人： DENKER, Martin, E. ,  BARTUSIAK, Joseph, T. ,  FERGUSON, Anthony, B. ,  HANSCHEN, Thomas, P. ,  JACKSON, Jeffrey, N. ,  MERRILL, William, W. ,  NEWHOUSE, Susan, J. ,  ROSKA, Fred, J. ,  THOMPSON, Richard, J. ,  WONG, Chiu, Ping

IPC分类号： B29C55/16

CPC分类号： B29C55/165

摘要： A method of stretching films in which all or a portion of the width of the film is cooled during or just after stretching so as to improve the uniformity of the film. The method includes stretching a polymeric film (26) in a tenter (10) that grasps the film with a plurality of clips (22, 24) along the opposing edges of the film (26) and propels the clips (22, 24) to thereby stretch the film. The tenter (10) includes driven clips (22) and idler clips (24), with at least one idler clip (24) between respective pairs of driven clips (22). The cooling is done so as to improve the uniformity of the clip spacing relative to the spacing obtained at otherwise identical process conditions without such cooling.