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Circular rubber and plastic products
- Overview
- Related Products
Material Selection
| Materials | Typical Grades | HRC | Characteristics |
| Stainless Steel | 440C, 304 | 58-60 | It is corrosion-resistant (suitable for PVC containing plasticizers and silicone rubber), has a sharp cutting edge, and is not easy to stick to materials. It is suitable for soft rubber (such as sealing strips) and films (PE/PP). |
| High-Speed Steel (HSS) | M2, M42 | 63-66 | It is wear-resistant and has good toughness. It is suitable for medium-hardness plastics (ABS, PS) and rubber with embedded fibers (such as conveyor belts). It is not easy to have the cutting edge chipped during high-speed cutting. |
| Cemented Carbide (Tungsten Steel) | YG6, YG10 | 89-92 | With ultra-high hardness, it is wear-resistant and impact-resistant. It is suitable for hard plastics (PC, nylon) and multi-layer composite rubber (tire treads). The service life of the cutting edge is more than 5 times that of high-speed steel. |
| Tool Steel | SKD11, Cr12MoV | 60-62 | It has a low cost and is suitable for ordinary rubber (EPDM) and soft PVC. It needs regular edge grinding (with a service life of about 100-200 hours). |
Non-metallic Materials
Ceramics (Alumina / Zirconia)
Characteristics:The hardness is above HRA 90. It is sharp without burrs, chemically inert (non-sticky to materials)
and has relatively high brittleness.
Application Scenarios:Precision plastic parts (medical catheters, optical films), and slitting of silicone rubber.
CVD/PVD Coatings
Characteristics:High-speed steel / cemented carbide substrate + TiC/TiAlN coating. The hardness is increased to
above HRC 70, which reduces friction and resists corrosion.
Application Scenarios:High-speed cutting ( > 500m/min), such as in the production line of automotive sealing strips
Type Selection
Size Classification
| Classification | Size | apply |
| Diameter (φ) | φ50mm - φ500mm (Customized according to demand) | φ100mm (Film slitting), φ300mm (Rubber sheet cutting) |
| Thickness (T) | 0.5mm - 6mm (The thickness affects the cutting resistance) | 1mm (Soft rubber), 3mm (Hard plastic) |
| Hole Diameter (d) | φ15mm, φ25mm, φ40mm (Matched with the shaft diameter of the equipment) | φ25mm (Standard slitting machine) |
| Cutting Edge Angle | 10°-25° (An acute angle reduces the tensile deformation of the material) | 15° (Soft rubber), 20° (Hard plastic) |
Model Classification
| Model | Diameter Range | Thickness | Cutting Edge Design | Typical Applications |
| Rubber Slitting Knife | φ150 - φ400mm | 2 - 4mm | Flat edge / Micro-serrated edge | Rubber coils (Sealing strips, tire sidewalls) |
| Plastic Film Knife | φ80 - φ200mm | 0.8 - 2mm | Mirror-finished edge (Ra ≤ 0.4μm) | PE/PP films, optical-grade PET |
| Circular Knife for Hard Plastics | φ200 - φ500mm | 3 - 6mm | Step edge / Bevel edge | Cutting of PC boards and acrylic boards |
| Precision Die-cutting Knife | φ20 - φ100mm | 0.5 - 1.5mm | Irregular edge (Wave-shaped, toothed) | Rubber sealing rings, plastic snap-fasteners |
Special Designs (Customized Requirements) - Serrated Edge: The tooth pitch is 0.5-2mm (such as 30 teeth per inch)
which prevents smooth plastics (such as PTFE) from slipping. - Helical Edge: With a helical angle of 3°-10°, it reduces
the cutting resistance (suitable for wide rubber sheets). - Hollow Edge: Water is passed through the inside for cooling
(for example, dissipating heat when cutting polyurethane at high speed).
Maintenance and Service Life
Edge Grinding Cycle: Stainless steel (80 - 150 hours) < High-speed steel (200 - 300 hours) < Cemented carbide (500
- 1000 hours)
Anti-sticking Treatment: Regularly maintain with silicone oil or PTFE coating (for materials that are prone to sticking)
Factors Affecting Service Life: Hardness of the material (for example, plastics containing glass fibers accelerate wear)
bluntness of the cutting edge (a blunt edge leads to material tearing), and tension of the equipment (uneven tension
causes uneven wear of the tool)
