I. Overview.
Like the tension of the paper sheet, the slitting and rewinding machine rewinding force is a force that stretches the paper sheet during the upward rewinding process after the initial rewinding pressure. The rewinding force is affected by the moment of the front bottom roller, and the rewinding force can also be described as the part of the total traction force of the rewinding. The traction is equal to the tension of the paper.
In the past, the rewinding force of the rewinder is the result of the adjustment of the torque or the torque ratio. The magnitude can be judged by the torque ratio of the bottom roller. When the diameter and inertia of the bottom roller are different, according to the torque of the bottom roller without a calculator. Or the torque difference is difficult to judge the size of the rewinding force.
Now, the required rewinding force is determined by the control system, the electric drive generates the required front bottom roller torque, and the speed and torque of the rear bottom roller are adjusted to be set, so that the force balance between unwinding and rewinding is maintained at The corresponding state.
The rewinding tightness is partly controlled by the rewinding force, and increasing the rewinding force can increase the tightness. During the acceleration process, additional rewinding force is required to compensate for the slack of the paper caused by the acceleration. In the process of deceleration, reducing the rewinding force can reduce the effect of tightening caused by braking.
2. The size of the rewinding force of the sliding and rewinding machine.
After the rewinding force is set, the predetermined effect of tensioning the paper roll will be achieved, and the paper will not slip between the paper roll and the bottom roller, and the friction between the paper roll and the bottom roller is limited to the technical requirements of the rewinding force Used within the scope, on the front bottom roller, the friction force is related to the friction coefficient. In addition to the above, the size of the wrap angle of the back bottom roller and the tension of the paper sheet also play a role. The slip of the front bottom roller determines the upper limit of the rewinding force, while the lower limit is determined by the slip of the rear bottom roller or the position occupied by the paper sheet on the front bottom roller. When the tension of the paper sheet changes, the speed difference is measured to ensure that there is no slippage between the bottom rollers.
The rewinding force of the slitting and rewinding machine is typically composed of 60%-70% of the internal rewinding force in the initial stage of rewinding and about 50% of the rewinding force. In the double bottom roll rewinding, due to the area loading One of the current increases is to make the tightness of the paper roll uniform. Taking into account the area loading, the rewinding force curve is in the opposite direction, that is, when the area pressure increases, the rewinding force decreases.
