What materials are suitable for high-speed turret rewinding and slitting machines?

Accurate tension control is the core of tightness to avoid wrinkling, deviation or inconsistency during high-speed winding. It is necessary to achieve the stable output of tension through mechanical structure optimization, dynamic feedback adjustment and process parameter matching. The following are the main control points and implementation strategies:

I. Core Principles principles of tension control
The essence of tension control is to maintain a constant tensile force on the material during the winding process and avoid deformation or displacement of the material due to tension fluctuations. The core logic is:
Tension = winding torque/winding radius
During the rewinding process, the rewinding radius changes constantly. Changes in radius need to be compensated by dynamic adjustment of winding torque (e.g. motor torque torque, braking force) or linear speed (e.g. main transmission speed) to maintain the stability of tension.

II. Key Measuress to avoid wrinkles
Wrinkles are usually caused by a lack of tension or uneven local tension and need to be controlled in several ways:
Co-design of coiling roller and roller
Roller pressure: Apply uniform pressure through the drum or spring to ensure the material is tight to the drum, preventing air from trapped and causing wrinkles.
Material of pressure roller: Select material moderate elastic modulus (such as rubber, polyurethane, etc.), which can provide sufficient pressure, but also can adapt to minor unevenness material surface.
Position of the pressure roller: The pressure roller should be directly above or slightly ahead of the roll to prevent the material from sagging and wrinkling before entering the roll.
2.Tension is controlled at the cross section.
Area tension setting: The unwinding process is divided into multiple areas (e.g., unwinding, intermediate traction zone and unwinding), with tension values set independently in each area to ensure that the material a stretched state at all stages.
Taper tension control: As the coil diameter increases, the tension in unit area gradually decreases (by reducing the coil torque or increasing the coil tension) to prevent the outer material from creasing by compressing the inner layer with too much tension.
3. Dynamic speed matching
Main drive and winding synchronization: The main drive (such as traction roller) and winding motor need to achieve closed-loop speed control through encoders or sensors to ensure consistent linear speed and avoid material stretching or stacking due to speed differences.
Acceleration control: During start-up, acceleration or deceleration, the speed curve needs to be adjusted smoothly to avoid sudden changes in tension caused by inertial impact.

III. Core Strategies for Preventing Deviation
Deviation is caused by inconsistent tension on both sides of the material or deviation of the steering mechanism. Optimization is needed in the following areas:
Centering Device (Centering device)
Automatic deviation correction system: The edge position of the material is detected by photoelectric sensor or ultrasonic sensors, which drives deviation correction roller (such as electric or pneumatic deviation correction rollers) to move sideways and adjusts the material path in real time.
Design of deviation correction roller: The surface deviation correction roller should be smooth to avoid scratching material. The scope of correction shall include the maximum offset of the material to ensure sufficient correction capacity.
2. Tension balance control
Independent adjustment of bilateral tension: Tension sensors are arranged on each side of the material to dynamically adjust the torque or release tension of the two windings through the PID controller to ensure consistent tension of the two sides.
Symmetrical design: the installation position of winding roll, pressure roller and guide roller must be strictly symmetrical to avoid uneven distribution of tension due to mechanical deviation.
3. Optimization of guide rollers;
Guide roller surface treatment: guide rollers surface should be smooth, surface roughness should be uniform, in order to prevent the material in high-speed operation due to friction and different deviation.
Guide roller Angle adjustment: by adjusting the guide roller's angle of inclination (such as winding angle adjustment), you can change the direction of the material force, help to deviation correction.

V. Practical solutions to inconsistent sealing
Inconsistent tightness is usually caused by tension fluctuations or defects in winding structures and requires improvement in the following areas:
1. Optimization of Winding roller structure
Stiffness of winding roller: The winding roller must have sufficient stiffness to prevent tension fluctuations caused by centrifugal force deformation during high-speed rotation.
Roll surface treatment: roll surface should be smooth, roughness uniformity, avoid local relaxation due to friction.
Centrifugation method: Centrifugation should be centrally installed with winding roller to avoid the winding eccentricity.
2. Tension closed-loop control
Tension sensor Feedback: Install tension sensors (such as floating roller type or strain gauge) in winding areas, monitor tension value in real time, and dynamically adjust winding torque or release tension through PLC or controller.
PID parameter tuning: Adjust the PID controller's ratio, integral, and differential parameters based on material properties such as elastic modulus and thickness to ensure a rapid tension response without overtuning.
3. Process parameter matching
Material property adaptation: Adjust the initial tensioning value and taper tensioning curve of the material according to its elastic modulus, thickness and surface roughness to avoid inconsistent tightness due to material deformation.
Withdrawal speed control: In high-speed winding, should gradually increase the speed to avoid sudden change in speed and cause tension fluctuations. At the same time, to ensure that the rewinding speed and material processing capacity (such as drying speed, coating speed, etc.).