Circular Knives Blades

What do Circular Knives Mean?

Circular knives, also known as rotary blades or disc knives, are cutting tools with a circular shape and a sharpened outer edge. They are designed to cut materials through a rotary motion, often against a counter blade or anvil. The term “circular knives” is broad and encompasses a wide variety of disc-shaped cutting tools used across numerous industries for slicing, slitting, perforating, and scoring various materials. Their rotating action allows for continuous and efficient cutting, making them ideal for high-speed production processes.

Uses and Applications of Circular Knives

Circular knives find extensive applications across a multitude of industries due to their efficiency and versatility in cutting various materials. Some key uses include:

• Paper and Converting Industries: Slitting rolls of paper, film, foil, and nonwovens into narrower widths. Sheeting continuous webs of these materials into individual sheets. Perforating paper and film for easy tearing.
• Packaging Industry: Cutting and trimming flexible packaging materials, labels, and cardboard. Slitting plastic films and laminates.
• Food Processing: Slicing meats, cheeses, vegetables, and bakery products. Trimming edges of processed foods.
• Textile Industry: Cutting fabrics, nonwovens, and fibers. Slitting rolls of textiles into narrower widths.
• Leather Industry: Cutting hides and leather into specific shapes and sizes.
• Rubber and Plastics Industries: Slitting and cutting rubber sheets, plastic films, and profiles.
• Metalworking: Slitting metal coils into narrower strips. Scoring metal sheets for bending.
• Recycling Industry: Shredding and cutting various materials for recycling processes.
• Medical and Pharmaceutical: Cutting medical dressings, films, and other materials.
• Hygiene Products: Cutting nonwovens for diapers, wipes, and other hygiene products.
• Label and Tape Manufacturing: Slitting wide rolls of labels and tapes into narrower widths.

Common Materials for Circular Knives

The choice of material for circular knives depends heavily on the material being cut, the speed of operation, and the required lifespan of the blade. Common materials include:

• Carbon Steel: Suitable for less demanding applications and cutting softer materials. Offers good sharpness.
• High-Speed Steel (HSS): Provides improved wear resistance and can maintain sharpness at higher speeds compared to carbon steel. Various grades like M2 and M42 offer different levels of performance.
• Alloy Tool Steel (e.g., D2, A2): Offers a good balance of hardness, toughness, and wear resistance, suitable for cutting thicker and more abrasive materials.
• Tungsten Carbide: Offers exceptional hardness and wear resistance, ideal for high-speed and high-volume cutting of abrasive materials like reinforced paper, fiberglass, and certain metals. Can be used as solid carbide blades or as carbide-tipped inserts.
• Ceramics: Used in specialized applications requiring extreme hardness, wear resistance, and corrosion resistance, such as cutting abrasive synthetic fibers or in environments where metallic contamination is a concern.
• Stainless Steel: Offers good corrosion resistance, important in food processing and medical applications. Different grades provide varying degrees of hardness and wear resistance.

Coatings such as titanium nitride (TiN), chromium nitride (CrN), or diamond-like carbon (DLC) can be applied to enhance surface hardness, reduce friction, and extend the life of circular knives, especially when dealing with abrasive or sticky materials.

Common Circular Knife Shapes

Circular knives come in a wide array of shapes and edge configurations to optimize cutting performance for specific applications. Common shapes include:

• Solid Disc Knives: Simple, one-piece circular blades with a sharpened outer edge. The edge can be straight, bevelled (single or double), or have a radius.
• Inserted Blade Knives: Feature replaceable cutting inserts made of harder materials like carbide, mounted on a steel body. This allows for cost-effective replacement of the wearing cutting edge.
• Scored Knives (Crush Cut Knives): Used in pairs, where one or both knives have a rounded or profiled edge that presses against a smooth anvil to create a score or crush cut in materials like paper or thin films.
• Shear Cut Knives: Used in pairs with overlapping, sharp edges that create a clean scissor-like cut. The overlap and side force are critical for clean cutting.
• Perforating Knives: Circular blades with teeth or специально designed protrusions to create lines of perforations. The size, shape, and spacing of the teeth determine the perforation pattern.
• Slitting Knives: Often thin, sharp-edged circular blades used for slitting rolls of material. The edge can be razor-sharp for thin films or more robust for thicker materials.
• Dished Knives: Circular blades with a concave or convex profile, often used for slitting or trimming operations where material tension needs to be controlled.
• Toothed Knives: Circular blades with various tooth patterns for specific cutting actions, such as tearing or rough cutting.

The working principle of circular knives involves rotary motion combined with controlled pressure against the material being cut. The sharpness and geometry of the cutting edge, along with the speed of rotation and the material properties, determine the quality and efficiency of the cut. In many applications, circular knives work in conjunction with anvils, counter blades, or other rollers to provide support and ensure a clean cut.

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If you don’t find the shear blade you are looking for, we can also customize it, see our “Custom Blades” to learn how!

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Why Choose Metal?

1. One-stop hassle-free import service

Easy to enjoy the convenience of importing, from transportation to customs clearance, we handle the whole process, you just need to pay VAT and wait for the goods to arrive at the company.

2. Competitive Pricing

We have seen its blades used in countless applications and is ready to handle whatever project you throw our way -delivering accuracy, durability, and unmatched competitive pricing.

3. ODM & OEM Available

Whether you provide drawings, sketches or samples, we are able to draw and manufacture for you. We also have the ability to assist in modifying existing designs and specifications to improve almost any industrial tooling application. Please contact our dedicated sales team to discuss your specific requirements.

4. Quality Control

A series of testing and inspections are performed to control quality, including first article inspection, Incoming material inspection, and materials certified, In-process quality inspection, Final quality inspection.

5. Flexible procurement, unlimited cooperation

Whether you are an importer, distributor, wholesaler or end-user, we welcome you to join us with minimum MOQ, no hassle for inquiry and more freedom for purchasing.

6. Overseas monitor, production progress real-time report

Become your exclusive monitor, regular transmission of every important node in the production line, no matter how far away, the progress of the product as far as possible to grasp!