CORRECTING METHOD FOR PERFORATED SHEET MATERIAL AND SHEET MATERIAL PERFORATING APPARATUS

PROBLEM TO BE SOLVED: To correct an uneven state such as a bulge occurring in a sheet material in association with perforation for eliminating difficulties in a subsequent process of the sheet material. SOLUTION: In this correcting method for a perforated sheet material, after the perforation of the sheet material, a periphery of a perforated part of the sheet material is pressurized by sandwiching it from the front and back of the sheet material for flattening the periphery of the perforated part. In this sheet material perforating apparatus, a perforating apparatus main body and, in a downstream side of a conveyance line of the perforating apparatus main body, correcting devices pressurizing by sandwiching the periphery of the perforated part from the front and back of the sheet material for flattening the periphery of the perforated part are arranged along the conveyance line of the sheet material.