A whole set of knife of a slotter machine consitsts mostly of slot knife, bottom knife, spacer, and valve knife.
Slotter knife is also called "Sector knife" by manufacturers due to its curved shape.
The function of slotter knife is obviously slot, slotting folding parts of corrugated cardboard by the teeth which coud be serrated or crescent-shaped.
Basic size: Angle of sector x (R-r) x T
Material: GCr15, 9SiCr, SKD11, LD, HSS
Teeth type: Serrated or crescent-shaped
Roughness of surface: Ra0.2-Ra0.8