📍 Anhui Province, China 📞 +86 155 5177 6915
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Factory Direct

Corrugated Box Making Knives Manufacturer

Thin-blade slitter knives, cross-cut shear knives, slotting saw-tooth knives and trim knives for corrugators, printer-slotters and die-cutting lines. We grind the thin blades in matched sets so the board scores clean instead of cracking.

Corrugated Box Knives — corrugated box knives, factory direct

Key features

  • Thin slitter blades down to 0.9 mm — clean score, no board crush
  • Solid carbide slitter blades for abrasive recycled liner
  • Slotting and corner-cut knives with consistent tooth profile
  • Cross-cut shear knives up to 2,800 mm in one piece
  • Trim knives ground in pairs for matched cutting gap

Specifications

MaterialSKD-11, Cr12MoV, 9CrSi, solid carbide (slitter blades)
HardnessHRC 58–62 (tool steel); HRA 89+ (carbide)
Slitter blade diameterφ200 – φ350 mm
Slitter blade thickness0.9 – 3.0 mm
Cross-cut knife lengthup to 2,800 mm, one piece
EdgeSingle bevel, double bevel, serrated slotting profile
Concentricity≤ 0.01 mm (slitter blades)
MOQSample 1 pc / batch by agreement

Applications

Corrugator slitter-scorers

Thin blades and carbide blades for the dry end.

Cross-cut shears

Board cut-off knives, single piece to 2,800 mm.

Printer-slotters

Slotting and corner-cut knives with clean tooth profiles.

Trim removal

Edge-trim knives on corrugators and sheeters.

Blade types we make in this line

A partial list — if you do not see your blade, send us the drawing or a photo and we will confirm.

Slitter scorer bladesThin slitter bladesSlotting knivesTrim knivesCut-off knivesSheeter knivesEdge trimming knives

Fitting your machine, and buying a replacement

Slitter scorer blades, slotting knives, trim knives and cut-off knives for corrugated box making lines, including machines of the Bobst, Martin, Dongfang and TCY families. Thin slitter blades are ground flat and parallel to a few hundredths of a millimetre, because a scoring line that wanders shows up as a bad fold downstream.

Also called: slitter scorer blades · slotting knives · carton box cutting blade · corrugated cardboard knife · cut-off knife · thin slitter blades.

Materials used for this blade

Cr12MoV
HRC 58–62 · High

Widely used, well understood grade. Good balance of cost and life.

Read the full grade guide
SKD-11 (D2)
HRC 60–64 · Very high

Longer life than Cr12MoV at higher cost. The default upgrade.

Read the full grade guide
9CrSi
HRC 56–60 · Medium-high

Economical and forgiving. Common for large straight knives.

Read the full grade guide
Solid Carbide
HRC 64–70 · Extreme

10–20× tool steel life, but brittle and not resharpened many times.

Read the full grade guide

Frequently asked questions

Usually one of three things: the blade has worn past its sharp life, the edge angle is wrong for your board grade, or the top and bottom knives are not a matched pair. Thin blades (0.9–1.2 mm) with the right bevel solve most crush complaints. Send us the board flute and liner weight and we will set the angle.
If you run virgin kraft liner, tool steel is fine and resharpenable. If you run recycled liner with sand and filler content, carbide pays for itself in weeks — it holds the edge 10–20 times longer against that abrasion.
Yes. Send a drawing or one used knife. We match the tooth pitch, depth and gullet radius so the slot comes out clean and the waste strip drops free.
Yes. The blade thickness sets the score width, and the score width sets where the board folds. A few hundredths out shows up as a fold line that is off centre on the finished box.
Send the drawing or the old blade. Thickness, outside diameter, bore and edge profile are all we need; we keep the same figures so the set drops into the existing holders.

Not sure which blade fits?

Send a photo of the blade you use now with a ruler next to it. We will tell you the grade and the edge angle.

Ask us