1. Tension Baseline Setting Principles
Material Tensile Strength: The initial tension is typically set at 10%-20% of the material's tensile strength. For example, 5-10N is recommended for aluminum foil, and 15-30N is recommended for PET film.
Thickness and Elasticity: Thin materials (such as 12μm anodized aluminum) require low tension (less than 5N), while elastic materials (such as rubber film) require dynamic tension compensation.
2. Staged Adjustment Method
Unwinding Phase: Maintain stable tension to prevent material vibration. Set the initial tension to 80% of the base value.
Rewinding Phase: Use tapered tension control (e.g., linearly decreasing from 15N to 10N) to prevent tension from being too tight inside and too loose outside.
3. Dynamic Adjustment Technology
Closed-Loop Control: Utilizes real-time feedback from a tension sensor and a PID algorithm for automatic fine-tuning (fluctuation ≤ ±0.5N). Floating Roller Compensation: To address changes in rewind and unwind diameter, increase tension by 5% for every 10% decrease in diameter.
4. Environmental and Process Adaptation
Temperature and Humidity Compensation: For every 10% increase in humidity, reduce tension by 2%-3%.
Speed Coordination: Increase tension by 10% during acceleration and by 5% during deceleration.
5. Verification and Optimization
Trial Cutting Test: Observe the smoothness of the slit edges and the alignment of the rewind end surfaces.
Parameter Recording: Establish a tension parameter library for different materials. For example, for gold and silver foil, record a low tension + slow start curve.
