Spread Roll

Description of Spread Roll
Spread roll is known as expander roll, bowed roll, banana roll, camber roll and wrinkle removing roll. Most of the spread roller are driving by web tension itself without any extra drive. Used in textile processing machines, plastic converting machines, paper industries, manufacturing, processing, printing, laminating, coating, batching, winding, and re-winding.

The spreading effect of the spreader roll is obtained through the curved steel shaft onto which rotate some rolls mounted on ball bearing. Externally onto the rolls is fitted, as a rule, a rubber sleeve which is free to rotate. The curved spreader roller is used for plastic films, paper, fabrics and similar products, or any time the installation of other types of roller is impossible.

Spread Roll working principle
The difference between normal straight roll and spread roll is whether the axis has radian. In fact, we can think of a normal straight roll as a special expander roll with an axis radius of infinite days. In the process of paper production and processing, due to the shrinkage force of paper cross-section, the paper often appears wrinkles during operation. In the application of the arc roll, when the coil is close to the entrance span L of the arc roll, the edges of both sides of the paper begin to tilt towards the end of the corresponding arc roll, and then slowly stretch the paper to obtain the tension effect, so as to prevent wrinkling. When the paper contacts the surface of the curved roll, the edge of the paper will move further, so that every point of the paper is transported perpendicular to the roller surface.

Spread Roll Function
Spread roll is widely used for paper, film, texitiles and similar machine and equipment. In the process of paper production and processing, due to the shrinkage force of paper cross-section, the paper often appears wrinkles during operation. And the spread roller in the paper wrinkle has superior performance. The main function of the tension roll in the transverse direction is the anti crease function. The selection of the arc roll will determine the tightness of the paper, thus affecting the anti wrinkle effect.