Corrugated Slitting Blades

Corrugated Slitter Knives for Corrugated Board Production

Persistools corrugated slitter knives are precision circular cutting tools used in slitter-scorer sections of corrugated board production lines.

These knives continuously slit corrugated board into the required widths before subsequent scoring, stacking, printing, converting, or box-making processes.

Although the knife structure itself is relatively simple, its dimensional accuracy and cutting-edge condition have a direct influence on production quality.

A stable slitting knife helps maintain:

• Clean board edges
• Consistent slit width
• Reduced paper tearing
• Reduced dust and fiber pull-out
• Stable high-speed production
• Predictable sharpening intervals
• Longer continuous operating cycles

Solid Tungsten Carbide Construction

Corrugated slitter knives are manufactured from solid tungsten carbide to provide the wear resistance required for continuous high-speed cutting.

Compared with conventional steel blades, carbide maintains its cutting geometry for significantly longer periods and is particularly suitable for modern corrugated production lines operating continuously.

The combination of carbide grade, grinding quality, blade thickness, bore accuracy, and cutting-edge preparation determines the overall cutting stability and service life.

Precision Matters at High Speed

Corrugated production lines operate at high speeds, so even a relatively simple circular knife requires good manufacturing accuracy.

Important dimensional characteristics include:

• Outer diameter
• Bore diameter
• Blade thickness
• Flatness
• Parallelism
• Concentricity
• Side runout
• Cutting-edge geometry
• Surface finish

Accurate dimensions allow the knife to fit correctly onto the machine shaft and rotate with minimal vibration or axial movement.

This is especially important when multiple slitter knives are operating simultaneously across the width of a corrugated production line.

In-Line Sharpening System

Most modern corrugated slitting systems use automatic grinding wheels to periodically sharpen the carbide slitter knife while it remains installed on the machine.

The knife and grinding wheel therefore operate as a matched cutting and sharpening system.

A correctly manufactured carbide knife should provide a stable edge that can be repeatedly restored by the in-line grinding system during production.

Persistools can also supply matching resin-bond diamond grinding wheels for corrugated slitter knife sharpening.

Replacement Knives for Different Slitter Systems

Corrugated production equipment manufacturers use different knife diameters, bore sizes, thicknesses, and mounting configurations.

Persistools can supply replacement carbide slitter knives according to:

• Machine brand
• Machine model
• Original knife dimensions
• Customer drawings
• Existing samples
• Outer diameter
• Bore diameter
• Blade thickness
• Edge geometry

Replacement knives can be produced for slitter-scorer systems from manufacturers such as:

• FOSBER
• BHS
• MARQUIP
• MITSUBISHI
• KAITUO
• MINGWEI
• Other corrugated machinery manufacturers

Machine-specific dimensions should be confirmed before production.