Overview of Film Slitting Rewinding Machines

Film slitting rewinding machines are essential in the plastic film processing industry. They slit wide plastic film rolls as per specific demands and rewind them into standard small rolls for various applications.

I. Basic Structure and Components
Unwinding Unit
The unwinding unit, the starting part, holds and releases the wide film roll. It has an adjustable tension control system. For example, magnetic powder brakes or servo motors control the unwinding resistance. The unwinding shaft, like an air expansion shaft, eases roll loading and unloading.
Cutting Unit
The core cutting unit uses tools like round and straight knives. Round knives suit thin, flexible films, cutting fast with smooth edges. Straight knives are for thicker or special films. It has a tool adjustment device to set position, angle, and pressure according to film thickness and material for precise cutting.
Rewinding Unit
The rewinding unit rewinds slit films. It has winding shafts (central or surface types), pressure rollers, and a tension control system. The central shaft is motor-driven for high-tension films; the surface shaft uses friction for thinner films. Pressure rollers ensure tight winding, and the tension system keeps film tension stable for good roll quality.

II. Working Process
Roll Installation and Preparation
First, install the film roll on the unwinding shaft and fix it. Then, check components, set the cutting width, and adjust tension parameters on the operation panel.
Unwinding and Cutting
After starting, the unwinding unit releases the roll. The film moves forward under tension and enters the cutting unit. The tools cut it into narrow strips according to the set width.
Rewinding and Finishing
The slit strips enter the rewinding unit. Pressure rollers press them onto the winding shaft. The tension system monitors and adjusts. As the roll diameter grows, parameters adjust for quality winding. When set, the equipment stops, and the rolls are ready for packaging.

III. Application Fields
Packaging Industry
In packaging, films from these machines are used widely. For food packaging, like wrap films and bags, and industrial product packaging, they provide suitable films for protection and appearance.
Electronics Industry
The electronics industry demands high precision. These machines slit optical, insulating films, etc., into tiny sizes for components. For LCDs, they cut polarizing films precisely, and for circuit boards, they get the right films for insulation.
Agriculture
In agriculture, films from Film Slitting Rewinding  machines cover greenhouse sheds and are used as mulch films. They are slit to fit different greenhouse and crop needs, enhancing production efficiency and crop protection.