CUT-OFF KNIFE
Precision industrial blade for corrugator lines
- Installed in the cut-off unit
- Cuts continuous board into exact sheet lengths
- Designed for high-speed operation
- Ensures dimensional accuracy and clean edges
- Reduces material waste
- Supports smooth downstream converting
- Reduced Blade Replacement
CUT-OFF KNIFE
Precision industrial blade for corrugator lines
- Installed in the cut-off unit
- Cuts continuous board into exact sheet lengths
- Designed for high-speed operation
- Ensures dimensional accuracy and clean edges
- Reduces material waste
- Supports smooth downstream converting
- Reduced Blade Replacement
A cut-off knife in a corrugator line is a precision industrial blade mounted in the cut-off unit at the end of the line.
Its job is to cut the continuous web of corrugated board into sheets of exact length at high speed (often 300 m/min or more) according to production orders.
It’s critical for dimensional accuracy, clean edges, minimal waste, and smooth downstream converting.
Construction Features
Material
High-Speed Steel (HSS) & Tungsten Carbide-Tipped (TCT) & Solid Carbide
Edge Design
Straight edge for clean shearing. & Serrated edge for certain grades or to reduce cutting load.
Precision Grinding
Ensures sharpness, uniform edge, and minimal burrs.
Coatings
TiN, TiAlN, or DLC for reduced wear and heat build-up.
Balance & Rigidity
To run vibration-free at high speeds
Customization
Length, hole patterns, and tooth profiles to match OEM machines.
Key Selection Factors
When choosing a cut-off knife:- Machine Model & Mounting Pattern – Hole spacing, slot positions, and length must match OEM specs.
- Board Grades & Flute Types – Heavy, recycled, or coated liners may require harder materials or serrated edges.
- Production Speed – High-speed lines need perfectly balanced, rigid knives.
- Cut Quality Requirements – For high-graphic or precision work, choose finer edge finishes.
- Maintenance Strategy – If sharpening in-house, choose a steel grade suitable for your grinder.
- Cost vs. Life – Carbide lasts longer but costs more; HSS is cheaper but needs more frequent changes.
Key Selection Factors
When choosing a cut-off knife:- Machine Model & Mounting Pattern – Hole spacing, slot positions, and length must match OEM specs.
- Board Grades & Flute Types – Heavy, recycled, or coated liners may require harder materials or serrated edges.
- Production Speed – High-speed lines need perfectly balanced, rigid knives.
- Cut Quality Requirements – For high-graphic or precision work, choose finer edge finishes.
- Maintenance Strategy – If sharpening in-house, choose a steel grade suitable for your grinder.
- Cost vs. Life – Carbide lasts longer but costs more; HSS is cheaper but needs more frequent changes.
Common Types
Straight Edge Cut-Off Knives
Standard for most corrugator applications.
Serrated Edge Knives
For heavy or multi-wall boards, reducing cutting force.
Single Knife Systems
One blade moving against a fixed anvil.
Twin Knife Systems
Two counter-rotating knives for cleaner, faster cuts.
Carbide-Tipped Knives
For abrasive liners and extended life.
Solid Carbide Knives
Premium option for maximum wear resistance.
Maintenance & Care
To ensure consistent cut quality and long knife life:
- Regular Cleaning – Remove starch, dust, and adhesive build-up.
- Proper Sharpening – Maintain correct bevel angle; avoid overheating during grinding.
- Balanced Installation – Prevents vibration and uneven wear.
- Scheduled Replacement – Change before dullness causes edge crush or dusting.
- Lubrication – If system uses felt wicks, keep them clean and properly oiled.
- Storage – Keep spare knives in dry, protected cases to avoid corrosion or chipping.
- Alignment Checks – Ensure knife and anvil are parallel for even cuts.
Key Parameters to Order
Parameter | Why It Matters | Typical Range / Note |
Overall Length | Must match machine | OEM-specific |
Width & Thickness | Affects rigidity & fit | OEM-specific |
Mounting Hole Pattern | Ensures correct fit | Hole size, spacing, slots |
Material | Determines wear life & sharpness | HSS, TCT, solid carbide |
Hardness | Edge retention | 58–65 HRC (steel), higher for carbide |
Edge Type | Cut quality & load | Straight, serrated |
Coating | Reduces wear & heat | TiN, TiAlN, DLC |
Balance Tolerance | High-speed stability | OEM requirement |