Corrugator Cut-Off Knives

Corrugator Cut-Off Knives

Persistools corrugator cut-off knives are long precision cutting blades used in the cut-off section of corrugated board production lines.

After corrugated board has been formed and slit to the required width, the cut-off unit cuts the continuously moving board across the machine direction according to the required sheet length.

Because modern corrugator lines operate continuously and at high production speeds, cut-off knife performance directly affects:

• Sheet length accuracy
• Cut-edge quality
• Production speed
• Cutting stability
• Paperboard deformation
• Knife replacement intervals
• Overall production efficiency

Long Knives for High-Speed Cross Cutting

Unlike conventional industrial knives, corrugator cut-off knives can exceed 3 meters in length.

The blade is mounted across the width of the corrugated production line and works together with the rotating cut-off drum.

Depending on the machine design, the knife may be manufactured with a controlled twist or helical profile so that the cutting edge engages the corrugated board progressively rather than contacting the full width at the same instant.

This progressive cutting action helps reduce instantaneous cutting load and provides smoother high-speed cross cutting.

Different Cutting Edge Constructions

Different corrugator machines and operating conditions use different blade materials and constructions.

Common options include:

TCT / Tungsten Carbide Cutting Edge

Tungsten carbide provides high wear resistance and long cutting life for demanding continuous-production applications.

HSS-Inlaid Cutting Edge

High-speed steel such as M2 can be welded or inlaid into a tougher tool-steel body.

This construction combines a wear-resistant cutting edge with a strong and flexible steel blade body, which is particularly useful for very long knives subjected to repeated dynamic loading.

Tool Steel Construction

Different tool steels can also be used according to the machine design, cutting speed, board structure, and required balance between toughness and wear resistance.

Precision Geometry and Twisted Installation

For an extra-long cut-off knife, dimensional accuracy involves much more than simply controlling length, width, and thickness.

Important factors include:

• Overall length
• Blade width
• Blade thickness
• Straightness
• Cutting-edge geometry
• Mounting-hole position
• Twist profile
• Helical installation geometry
• Edge consistency along the complete blade
• Compatibility with the cut-off drum

The knife must match the machine geometry accurately so that the cutting edge follows the intended path during drum rotation.

For this reason, most corrugator cut-off knives are supplied according to an existing machine model, drawing, or original blade sample.

Replacement Knives for Different Corrugator Systems

Different corrugator manufacturers use different knife dimensions and upper/lower blade configurations.

Persistools can manufacture replacement cut-off knives for machines from manufacturers including:

• BHS
• Fosber
• Hsieh Hsu
• Kaituo
• Justu
• JS
• Other corrugated machinery manufacturers

Upper and lower knives can be manufactured according to the corresponding machine specification.