What is Slotter Blade Knives ?

Slotter Knife for Corrugated Cardboard Production Line

Belonging to the core cutting tool of the corrugated cardboard box production line (printing, slotting, and die-cutting machine), it is used to create a shaking cover slot on the cardboard board for easy folding into boxes. The cardboard slotting knife is a key tool used in cardboard printing slotting machines to process slots on corrugated cardboard. Its core function is to provide a structural foundation for the folding and forming of cardboard boxes.

Main Functions of Slotter Knife

1. Slotting: By using a high-speed rotating upper and lower blade to cut U-shaped or V-shaped slots at the edge of the cardboard, the material is not easily cracked when the cardboard box is folded, and the corners of the box are flat.

2. Cooperate with line pressing: Work together with the line pressing wheel to press the folded line on the cardboard, ensuring precise folding along the predetermined path.

3. Corner cutting processing: Some slotting knife sets also integrate corner cutting function to remove excess cardboard for folding.

Classification of Slotter Knife

The upper slotting knife (upper knife) rotates actively, with the blade on the outer circle.

The lower slotting knife (lower knife/bottom knife) is fixed or moved, forming a shear gap with the upper knife. The upper and lower knives cooperate to achieve burr free and smooth cutting.

Material of Slotter Knife

High quality: Cr12MoV, SKD-11, high-speed steel HSS

Hardness: HRC 58-62

Precision

Radial runout ≤ 0.01mm

Gap between upper and lower blades 0.03-0.08mm

Blade Edge

Sharp, no breakage

Wear resistant, continuous production without burrs, bursting edges, or crushing cardboard

How to Choose Slotter Knife

When choosing a carton slotter knife, multiple factors need to be considered. Firstly, the material and hardness of the blade directly affect the cutting effect and the lifespan of the blade. Secondly, the shape and angle of the blade need to be selected according to specific cutting requirements. In addition, it is necessary to consider the specifications and dimensions of the blades to ensure compatibility with the processing equipment.

In addition, with the continuous development of technology, carton slotting knives are also constantly innovating and upgrading. Some advanced blades adopt special coating technology, which can further improve the wear resistance and service life of the blades. At the same time, some intelligent processing equipment is also equipped with automatic tool changing and tool wear detection functions, which can greatly improve production efficiency and processing quality.