Blade Alignment
Rotary shear slitter positioning establishes the geometric relationship between the upper dish knife and the lower anvil band during high speed paper web cutting. The cant angle represents the horizontal tilt of the top blade relative to the vertical plane of the bottom band. This setting ensures that the blades touch at a single point of contact.
Shear Dynamics
Mechanical contact between the rotating disks generates the shearing action required to sever tough paper fibres cleanly. When the cant angle is adjusted, it controls the lateral force holding the blades together and dictates the size of the cutting nip. Excessive angles generate high friction, which creates heat and accelerates blade wear.
Insufficient angles lead to blade separation, which results in uncut strands.
Slit Quality
Deterioration of the cut edge occurs when the mechanical setup deviates from the specified dry-point alignment. A correct slitter geometry minimises dust generation and prevents the formation of a raised edge on the paper reel, which would otherwise cause uneven tension profiles during subsequent winding or printing operations. Web thickness and density govern the optimal angle setting, which typically ranges from zero to one degree depending on the tensile strength of the paperboard.
Automated slitter systems monitor and adjust this parameter dynamically to compensate for mechanical vibrations. Maintaining this geometric precision prevents edge cracks that initiate tears during the print run.
