What Is The Function Of Rewinder Machine?

The rewinder machine plays a crucial role in the paper industry, converting large rolls of paper produced by paper machines into smaller, more manageable rolls. Its primary function is to unwind, slit, and rewind the paper, transforming it into finished rolls of specific widths and lengths. The rewinder contributes to the final processing of paper before it is shipped for various end-use applications. Here are the main functions of a rewinder machine:

1. Unwinding:
Parent Roll Handling: The rewinder starts by unwinding the jumbo roll, also known as the parent roll or master roll. This jumbo roll is typically produced by the paper machine during the papermaking process.
2. Slitting:
Cutting the Paper Web: The rewinder is equipped with slitting mechanisms that allow it to cut the wide paper web into narrower strips. The slitting process determines the width of the finished rolls.
3. Inspection and Quality Control:
Quality Inspection: Some rewinder machines are equipped with sensors and inspection systems to detect and reject any defects or imperfections in the paper. This ensures that only high-quality paper is wound onto the new rolls.
4. Winding:
Roll Formation: The rewinder winds the cut paper strips onto new rolls, creating finished rolls of paper. The winding process can involve layering the paper in a specific pattern to achieve desired characteristics in the finished rolls.
5. Web Control:
Tension and Alignment Control: Sophisticated web control systems ensure the proper alignment and tension of the paper web during the rewinding process. This control is essential to achieve accurate and consistent results.
6. Automatic Controls:
Automation and PLCs: Modern rewinders often feature automation and programmable logic controllers (PLCs) to control and monitor the rewinding process. This includes setting parameters such as roll diameter, tension, and cutting specifications.
7. Tail Threading:
Seamless Transition: Some rewinders have tail threading systems that assist in threading the beginning of the paper web from the expiring jumbo roll to the new reel seamlessly.
8. Reel Changeover:
Continuous Operation: In some cases, rewinders are designed for continuous operation with automatic reel changeover. This allows for a seamless transition from one jumbo roll to another without interrupting the production process.
9. Finished Roll Handling:
Ejection and Transport: Once the rewinding process is complete, the finished rolls are ejected from the rewinder. These rolls can then be transported to downstream processes or prepared for shipping.
Types of Rewinders:
There are different types of rewinder machines, including center rewinder, surface rewinder, and center-surface rewinder, each with specific characteristics and advantages.