The function of the driving roller of stretch film rewinder machine is to determine the tension between the speed and the material.The driving roller consists of two or three guide rolls.When two rolls are driven, a guide roller is driven, and three rollers are driven by two active rolls.The surface of another driven roller is usually rubber or other nonmetallic material.

For the unrolled parts of the brake type, the driving roller is rotated during printing, so that the printing material in the uncoil unit produces tension, so the material roll is rotated and the material belt is expanded.Driven roller and wrap film rewinding machine parts roller surface speed to maintain a certain proportion relationship, are typically driven roller surface linear speed is a bit low, so we can make the wrap film rewinding machine parts in substrate has the stable tension.At present the production and use of wrap film rewinding machine drive roller is generally through the main transmission gear chain, and the driven roller diameter less than the pitch diameter of gear, so that its surface linear velocity is lower than the print version of the drum.This method is relatively simple, but the driving roller and the printing plate surface speed ratio is fixed.

Due to the tension of different materials - extension characteristics are different, the same kind of materials have different characteristics, so there are a lot of stretch film rewinding machine installed on the driven roller of variable speed device, based on the actual need precise adjustment driven roller and wrap film rewinding machine parts of roller speed ratio relations.

Driving roller for solution and keep the substrate in the production of stretch film tension is necessary, but should be noted that the size of the drive roller can't roll tension control solution, the size of the tension setting and elimination of tension fluctuation or by floating roller, braking device.