Slitter apparatus and production method of electrode

A slitter apparatus comprising a rotary shaft provided with one or more circular upper blades at a predetermined interval, and a shaft provided with one or more linear lower blades at a predetermined interval and in parallel, and arranged to be normal to edge faces of the lower blades, the shafts being arranged in parallel with each other and at such a spacing as to achieve a predetermined engagement depth with contact between a side face of a peripheral part of the upper blades and a side face of a peripheral part of the lower blades,

• wherein a thickness of the upper blades is not less than 1 mm,
• wherein an included angle of the upper blades is in a range of 75 to 88°,
• wherein hardnesses of the upper blades and the lower blades are in a range of 6.9×103 to 8.8×103 N/mm2, and a difference between the hardness of the upper blades and the hardness of the lower blades is not more than 4.9×102 N/mm2, and
• wherein surface roughnesses of the upper blades and the lower blades are not more than 4 μm, and a difference between the surface roughness of the upper blades and the surface roughness of the lower blades is not more than 2 μm.