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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:

• Industri Kertas dan Konversi: 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.
• Industri Pengemasan: Cutting and trimming flexible packaging materials, labels, and cardboard. Slitting plastic films and laminates.
• Pengolahan Makanan: Slicing meats, cheeses, vegetables, and bakery products. Trimming edges of processed foods.
• Industri Tekstil: Cutting fabrics, nonwovens, and fibers. Slitting rolls of textiles into narrower widths.
• Industri Kulit: Cutting hides and leather into specific shapes and sizes.
• Industri Karet dan Plastik: Slitting and cutting rubber sheets, plastic films, and profiles.
• Metalworking: Slitting metal coils into narrower strips. Scoring metal sheets for bending.
• Industri Daur Ulang: Shredding and cutting various materials for recycling processes.
• Medis dan Farmasi: Cutting medical dressings, films, and other materials.
• Produk Kebersihan: 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:

• Baja karbon: Suitable for less demanding applications and cutting softer materials. Offers good sharpness.
• Baja Kecepatan Tinggi (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.
• Baja Perkakas Paduan (misalnya, 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.
• Baja Tahan Karat: 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: Bilah bundar sederhana, satu bagian dengan tepi luar yang tajam. Tepinya bisa lurus, miring (tunggal atau ganda), atau memiliki radius.
• Pisau Bilah Sisipan: Dilengkapi sisipan pemotong yang dapat diganti yang terbuat dari bahan yang lebih keras seperti karbida, dipasang pada rangka baja. Hal ini memungkinkan penggantian mata potong yang aus dengan biaya yang efektif.
• Pisau Potong Remuk (Pisau Potong Remuk): Digunakan secara berpasangan, di mana satu atau kedua pisau memiliki ujung yang membulat atau berprofil yang menekan landasan halus untuk membuat goresan atau potongan tajam pada bahan seperti kertas atau film tipis.
• Pisau Potong Geser: Used in pairs with overlapping, sharp edges that create a clean scissor-like cut. The overlap and side force are critical for clean cutting.
• Pisau Perforasi: 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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