Advanced Slitting Blade Technology and Tension Control for High-Speed Rewinding 2026
Slitting is a critical operation that divides the wide master roll into narrower rolls. Two main slitting methods are used: razor slitting and shear slitting. Razor slitting uses a thin, sharp blade that cuts the film; it is suitable for thin films (up to 50 µm) and produces a clean edge, but the blade dulls quickly. Shear slitting uses a pair of rotating knives (a top knife and a bottom anvil) that shear the film; it is suitable for thicker films and has longer blade life. The choice depends on the film thickness and material. For high-speed lines (200+ m/min), shear slitting is often preferred for reliability. The blade material is typically carbide or high-speed steel. In summary, selecting the right slitting technology is essential for achieving clean edges and long blade life. The operator should monitor the edge quality and replace blades when dust or ragged edges appear. In conclusion, advanced slitting blade technology ensures high-quality slit edges and reduces dust contamination.
Tension control during rewinding is critical to maintain roll quality. The tension should be consistent across all slit strips; individual dancer rolls or load cells are used. The tension should be set lower for thin films to prevent stretching. The winder should have a taper tension control that reduces tension as the roll diameter increases, preventing core crushing. In practice, the operator should check the roll hardness and adjust tension if needed. In conclusion, advanced tension control and slitting blade technology are key to producing high-quality slit rolls with consistent density and edge quality.
Blown Film Machine
Slitting methods: Razor: thin blade, for thin films (<50 µm). Shear: rotating knives, for thicker films (>50 µm). Blade material: carbide or HSS. Tension control: Individual dancer rolls or load cells. Taper tension: reduces tension as diameter increases. Maintenance: Sharpen or replace blades regularly. Check for dust. In practice, the operator should inspect slit edges under a microscope to detect any defects. In conclusion, advanced slitting and tension control ensure high-quality finished rolls, reducing waste and improving customer satisfaction.
