To provide a female creaser die for forming a crease on a sheet such as corrugated cardboard, which is capable of forming a normal folding crease for folding a flap inside as well as a reverse folding crease for correctly and linearly folding a flap outside without irregularities when a content such as cans is pushed into a box by pressing with a male creaser die.
In the female creaser die A equipped with a recessed groove 1 and groove forming edges 2 and 3 arranged on both sides of the recessed groove 1 symmetrically left and right and forming a normal folding crease to the required part of corrugated cardboard paper C by pressing with the male creaser die, the height L of one groove forming edge 2 is made larger than the height L1 of the other groove forming edge 3 to form even the reverse folding crease 5 weak in stiffness. Further, the width L2 of the top flat surface 2-1 of the groove forming edge 2 is made less than the width L3 of the top flat surface 3-1 of the groove forming edge 3.
Mitsuo Chonan
Ishiwatari Eibo
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