Paper slitting rewinding machine (also called a slitter-rewinder, winder, or converter) is an industrial machine designed to convert large master/jumbo rolls of paper into narrower, smaller-diameter rolls that meet specific customer requirements for width, length, and tightness.
Basic Working Principle
The process follows a straightforward path:
Unwind: A large parent roll is mounted.
Guide & Control: The paper web is threaded through tension control and guiding systems.
Slit: The wide web is cut into multiple strands using specialized blades.
Rewind: The slit strands are wound onto individual cores to form finished rolls.
Eject: Finished rolls are removed for packaging and shipping.
Key Machine Components
Unwind Stand: Holds the parent roll. Can be shafted (using a shaft through the core) or shaftless (using arms or chucks). High-end versions have auto-loading and tension pre-setting.
Tension Control System: The most critical part for quality. Maintains consistent pull on the paper web. Types include:
Dancer Roller System: Mechanical, reliable.
Electronic Tension System: Uses load cells for precise feedback; more accurate.
Slitting Unit: Where the cutting happens. Two main types:
Shear Cut: A circular upper blade cuts against a lower anvil blade. Produces clean, dust-free edges. Ideal for coated papers, films, and high-speed operation.
Razor/Score Cut: A razor blade scores the web against a hardened roll. Simpler and lower cost, but can generate more dust. Suitable for many paper grades, especially thicker ones.
Rewind Section: Where new rolls are formed. Two primary designs:
Dual-Drum/Surface Winder: Slit strands are wound onto cores pressed against two large motorized drums. Produces very hard, dense rolls. Most common for paper.
Center/Shaft Winder: Each new roll is driven by its own shaft/chuck. Allows for different tensions on each strip and softer rolls.
Drive & Control System: Modern machines use a PLC (Programmable Logic Controller) with a touchscreen HMI (Human-Machine Interface). This controls speed, tension, length, and stores job recipes.
