| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a problem of combustion processing due to the fact that all the composing elements are made of paper by forming a holder end holding wall having an insertion slit for inserting a claw constituted by raising a cooperative extension piece into an insertion piece having a claw at a tip end pulled out of a central part and raised. SOLUTION: This file is constituted of a front surface constituting surface 1, a rear surface constituting surface 2 and a stitching element constituting surface 3. These elements are formed by cutting a sheet of cardboard and a printing and ornamental setting are properly performed on them. The central part of the stitching element constituting surface 3 is formed with a slit 9 for forming an insertion part. An extension piece for forming a holder end holding wall 8 is cooperatively arranged at the lower part of it through a folding line. As a shape of the slit 9, in other words, the inserting section, various kinds of shapes can be devised. For example, the two insertion pieces 13 having claws 12 at their tip ends are properly spaced apart, or two claws are arranged side by side at the tip end of one insertion piece 13.
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