A rewinder machine, also known as a rewinding machine or rewinder, is a piece of equipment used in various industries, particularly in the paper, printing, converting, and packaging industries. The primary function of a rewinder machine is to rewind rolls of material, such as paper, film, foil, or other flexible materials, into new rolls with different dimensions or characteristics. It plays a crucial role in the production and processing of materials in these industries.
The working principle of a rewinder machine involves several components and processes:
Unwinding: The process begins with unwinding the original roll of material. The original roll is mounted on an unwind stand or shaft, and the material is fed into the rewinder machine.
Tension Control: Tension control mechanisms are employed to maintain proper tension throughout the rewinding process. This ensures consistent winding and minimizes issues such as wrinkles, stretching, or tearing of the material.
Slitting (Optional): In some cases, a rewinder machine may incorporate a slitting section. This section includes slitting knives or blades that cut the wide web of material into narrower strips or multiple lanes. Slitting allows for the production of multiple smaller rolls or different widths of material.
Rewinding: The rewinding process involves winding the material onto a new core or shaft to create a new roll. The machine controls the tension, speed, and alignment of the material as it is wound onto the new core. The rewinder may use various techniques to ensure tight, even winding, such as nip rollers, dancer arms, or tension control devices.
Core or Shaft Handling: The rewinder machine accommodates different core or shaft sizes based on the desired final roll. The machine may include mechanisms to easily load and unload cores or shafts and secure them in place during the rewinding process.
Trim Removal (Optional): In certain applications, the rewinder machine may also have a trim removal section. Trims refer to the excess material or edges that are trimmed off during the rewinding process. Trim removal mechanisms, such as trim winders or trim choppers, collect and remove the trims to maintain a clean and efficient operation.
Control System: A control system is an integral part of the rewinder machine. It includes sensors, actuators, and controls to monitor and adjust parameters such as tension, speed, diameter, and alignment. The control system ensures precise and consistent rewinding operations.
Rewinder machines come in various types and configurations to accommodate different material types, widths, and production requirements. They can be manual or automated, depending on the complexity of the rewinding process and the level of operator intervention. Rewinder machines play a crucial role in improving efficiency, quality, and productivity in industries that rely on roll-to-roll processing and material conversion.Besides,The structure of a rewinder machine can vary depending on the specific design and manufacturer. However, the basic components and structure of a rewinder machine typically include:
Unwind Section: This section consists of an unwind stand or shaft where the original roll of material is mounted. It may include mechanisms such as pneumatic brakes or clutches to control the tension and unwinding of the material.
Web Guide System: A web guide system is often included to ensure proper alignment and control of the material as it moves through the rewinder machine. It may utilize sensors, edge detectors, or guiding rollers to detect and adjust the lateral position of the material.
Slitting Section (Optional): In machines equipped with a slitting capability, a slitting section is present. This section contains slitting knives or blades that cut the wide web of material into narrower strips or multiple lanes. It may include adjustable knife holders, blade positioning systems, and waste removal mechanisms.
Rewind Section: The main component of the rewinder machine is the rewind section where the rewinding of the material takes place. It typically consists of one or more rewind shafts or cores onto which the material is wound to create new rolls. The rewind section may include mechanisms such as nip rollers, dancer arms, or tension control devices to ensure proper tension and uniform winding of the material.
Core Handling System: The rewinder machine
incorporates a core handling system to handle the cores or shafts onto which the material is rewound. It may include mechanisms to load and unload the cores, secure them in place, and provide precise control of their movement.
Trim Removal System (Optional): Some rewinder machines have a trim removal system to handle and remove excess material or trims generated during the rewinding process. This system may include trim winders, trim choppers, or suction devices to collect and dispose of the trims.
Control Panel: A control panel is typically integrated into the rewinder machine. It houses the control system and user interface, allowing operators to monitor and adjust various parameters such as tension, speed, diameter, and alignment. The control panel may include displays, buttons, switches, and programmable logic controllers (PLCs) for efficient control and operation of the machine.
Safety Features: Rewinder machines often incorporate safety features such as emergency stop buttons, safety interlocks, guarding, and sensors to ensure operator safety during operation.