Westerman, Hattori, Daniels & Adrian, LLP
Method of producing pressed paper piece and apparatus therefor
The objective of the present invention is to provide a method of forming a pressed paper piece by deep drawing a sheet of blank that is primarily made of paper in use of a punch and a die, and a production apparatus for implementing the method, whereby no distinguishable wrinkles are formed in upright portions of the pressed paper piece. The method of producing a pressed paper piece according to the present invention, implemented when deep drawing a sheet-like blank that is primarily made of paper in use of a punch and a die, includes maintaining a predetermined gap between a first blank holder and the die in an outer peripheral region of a process portion of the blank and applying a pressure to a radially inner region thereof via a second blank holder, thereby reducing wrinkling by an effect of integrated functions exerted in both regions of the blank.
TOYO SEIKAN GROUP HOLDINGS, LTD. TOKAN KOGYO CO., LTD.
B B B B B B
B29C B31F B29L B29K B29D B31B
inventional inventional additional additional additional additional
Kenichi Ichiro Masahiro Seiji
Takao Kunihiro Ogawa Okabe