Patent Number: 6,254,523

Title: Method of imparting directional permanency of folding to sheet, and apparatus therefor

Abstract: A method of imparting directional permanency of folding to a sheet, and an apparatus therefor, which is suitable for manufacturing frame bodies, cushioning members and other block products for packaging, from a sheet of paper and other recyclable materials. The method includes a step of moving respective folding working tools, disposed on one or both surfaces of a sheet, required amounts so as to fold the sheet along respective folding ruled lines, and a step of shortening spacings between the respective folding working tools in a uniform ratio in accordance with an apparent amount of shortening in a longitudinal dimension caused by the shifting, while synchronizing with the moving step. Directional permanency of folding can be accurately imparted to the sheet along the folding ruled lines.

Inventors: Yamamoto; Masahiro (Osaka, JP), Yokoyama; Yoshimasa (Kohbe, JP)

Assignee: Hitachi Zosen Corporation

International Classification: B31F 1/00 (20060101); B31F 1/08 (20060101); B31F 007/00 ()

Expiration Date: 07/03/2018