Fuji Seal, Inc.

Shoichi Omori

Haruyoshi Kawata

The present invention provides a sheet with a folding portion that has a sheet body such as a plastic sheet, on which a folding portion ( ) is formed perpendicular with respect to the folding direction (X). The folding portion ( ) of the sheet includes a large number of recesses ( ) and remnants ( ) defined between the recesses ( ) formed on the sheet body ( ). Boundary lines ( ) between the recesses ( ) and the remnants ( ) each are tilted at acute angle with respect to the folding portion-forming direction (Y) and towards the same side as that of an opposite one of the boundary lines ( ) with a corresponding remnant ( ) therebetween. The present invention also provides a shaping blade for shaping the folding portion on the sheet.

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Osaka, Japan

Shoichi Omori