How does a stretch film slitting & rewinding machine precisely cut large rolls of film into smaller rolls of various widths?
Publish Time: 2025-08-20
In the packaging material industry, stretch film is widely used for containerized transportation and protection of goods due to its excellent ductility, tear resistance, and self-adhesive properties. However, stretch film produced on existing production lines typically comes in large, wide rolls, which cannot directly meet market demand for smaller rolls of varying widths. Precisely slitting large rolls of film into smaller rolls of varying widths is a critical step in the production process, a task primarily accomplished efficiently by stretch film slitting & rewinding machines.1. Precision Mechanical Structure Design Ensures Stable OperationThe overall structural design of a stretch film slitting & rewinding machine is the foundation for precise slitting. The equipment typically utilizes a highly rigid frame to effectively reduce vibration and deformation during high-speed operation, ensuring the synchronization and stability of all components. Both the unwinding and rewinding shafts are precisely balanced to ensure smooth and smooth unwinding of the parent roll and rewinding of the child rolls. The guide roller system utilizes mirror-polished aluminum alloy or stainless steel rollers for a smooth, wear-resistant surface that prevents film scratches. Furthermore, the guide rollers are strategically positioned and routed to minimize film deviation and wrinkling during transport, ensuring optimal subsequent precision cutting.2. Diverse Cutting Systems to Meet Different NeedsThe slitter rewinder is equipped with a variety of cutting methods to accommodate stretch film of varying thickness, material, and precision requirements. Currently, mainstream cutting methods include mechanical blade cutting (such as circular and straight blades) and razor blade cutting. Circular blade cutting is suitable for medium-thick stretch film, using paired upper and lower circular blades to achieve continuous longitudinal cuts, resulting in clean cuts and high efficiency. Razor blade cutting, on the other hand, is ideal for ultra-thin or high-transparency films, enabling precise slitting without burrs or indentations. The cutting blade position is precisely adjusted along the transverse guide rails, using a digital scale or servo control system to maintain a width tolerance of within ±0.1mm for each slitting line, meeting the needs of concurrent production of multiple specifications.3. Intelligent Tension Control System Ensures Film Surface QualityDuring the slitting process, controlling film tension is crucial. Excessive tension can cause film deformation or even breakage, while insufficient tension can lead to loosening, wrinkling, or misalignment during rewinding. Modern slitter rewinders generally utilize closed-loop tension control systems, incorporating magnetic powder brakes, pneumatic web guides, and tension sensors to monitor and dynamically adjust unwind and rewind tension in real time. Some high-end models also feature an automatic taper tension function, which gradually reduces tension during rewinding to prevent deformation of the inner film layer. This ensures uniform tightness and uniformity within the roll, improving the finished product's appearance and subsequent user experience.4. Automated Operation Improves Efficiency and PrecisionWith the advancement of industrial automation, slitter rewinders are increasingly integrated with PLCs (Programmable Logic Controllers) and human-machine interfaces (HMIs), enabling integrated operation for parameter setting, operation monitoring, fault alarms, and data logging. Operators simply enter parameters such as target width, length, and roll diameter on the touchscreen, and the system automatically calculates the blade position, sets the tension, and initiates the cutting process. Some equipment also supports multiple recipe storage, enabling quick switching between different product specifications and significantly reducing changeover time. Furthermore, an automatic splicing device allows for the splicing of new and old parent rolls without stopping the machine, further improving production continuity and efficiency.5. Online Inspection and Quality Assurance SystemsTo ensure that each batch of small film rolls meets quality standards, advanced slitting and rewinding machines are often equipped with online inspection systems. For example, photoelectric sensors monitor the film edges for alignment, breakage, or misalignment in real time. Camera vision systems identify surface defects such as crystals, scratches, or impurities, automatically marking or rejecting defective products. After rewinding, the equipment automatically prints a label recording batch number, width, length, and production time for easy traceability and management.Stretch film slitting &rewinding machine utilize sophisticated mechanical structures, flexible cutting systems, stable tension control, a high level of automation, and comprehensive quality inspection methods to efficiently and accurately convert from large rolls to smaller rolls of various widths. This not only improves production efficiency but also ensures product consistency and market adaptability, providing solid technical support for the widespread application of stretch film.
