The factors that cause fluctuations and
changes in tension are often complex, and the main influencing factors are
roughly as follows:
1. The change in the speed of the machine
will inevitably cause changes in the tension of the whole machine;
2. During the rewinding and unwinding
process of the slitting machine, the diameter of rewinding and unwinding rolls is
constantly changing. The change of diameter will inevitably cause the change of
raw material tension. Under the condition that the unwinding torque is
constant, the diameter of rolls will decrease and the tension will increase
accordingly. The change in rewinding tension is opposite. If the rewinding
torque is constant, the tension will decrease as the rewinding diameter of
rolls increases. This is the main factor that causes the tension of the raw
material to change during machine operation;
3. The change of the tightness of the raw
material roll will also cause the change of the tension of the whole slitter machine;
4. Inhomogeneity of raw materials affects
the tension of slitter rewinder. For example, the fluctuation of material
elasticity, the change of material thickness along the width and length
direction, the eccentricity of the mass of the material roll, and the change of
temperature and humidity in the production environment will also affect the
tension fluctuation of the whole machine;
5. The transmission mechanisms of the
slitting machine (such as guide shafts, floating shafts, unfolding shafts,
etc.) are unbalanced and air pressure unbalanced.
6. The change of speed during slitting
affects the change of tension. When the speed is increased or decelerated, the
speed of the main motor changes. Firstly, it causes an instantaneous change in
the tension of the material from the unwinding traction to the rewinding
section. In the meanwhile, it must take a period of time for the material from
vibrate slightly to gradually stabilize the tension. The instability of this
tension is manifested in the uneven rewinding of the finished roll and the
unevenness of the end surface, which affects the product quality.
