Aug 31, 2026
A Circular Disk Slitting Knife (often called a rotary slit blade or circular slitter) is a precision cutting tool used primarily in industrial converting, packaging, and manufacturing machinery to slice continuous webs of material into narrower strips.
Key Characteristics:
Shape: Designed as a flat, ring-like circular disk with a central bore to mount onto a rotating shaft or driven arbor.
Cutting Action: Operates typically through shear cutting (acting like a pair of scissors against a bottom knife), score cutting (crushing the material against a hardened anvil roll), or razor slitting.
Edge Profile: Available with single-bevel, double-bevel, dish-shaped, or serrated edges depending on the desired cleaness of the cut and the material type.
Common Applications:
Paper & Pulp: Slitting large paper rolls into smaller rolls for receipts, newspapers, or packaging.
Plastic & Film: Cutting flexible packaging films, cellophane, and plastic sheeting.
Textiles & Nonwovens: Precision trimming of fabrics, synthetic fibers, and hygiene products.
Metal Foil: Slitting thin aluminum, copper, or other metal foils.
Materials Used:
Because these blades run at high speeds and face continuous friction, they are manufactured from durable materials such as:
Tool Steel (e.g., D2, SKD11): Provides a balance of toughness and wear resistance.
High-Speed Steel (HSS): Ideal for higher operating temperatures and extended wear.
Tungsten Carbide: Extremely hard and long-lasting, perfect for abrasive materials and high-volume production runs.
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