Slitting machines have evolved from rudimentary manual-tension devices to fully digital, servo-controlled systems operating well above 300 m/min. In China, the progression has followed a distinct three-generation path — from what the industry calls “telephone-era” machines to “digital-era” systems — and the latest intelligent slit-rewinders now incorporate process expert databases and self-diagnostic service functions. Here is how the technology has developed and what current-generation machines deliver.
Three Generations of Chinese Slitting Technology
The industry describes the evolution with a telecom metaphor. First-generation slitters were structurally simple, running at around 100 m/min with mechanical friction-based manual tension control — the “telephone” era. Second-generation machines introduced clutch-based winding control and single-motor drive for both the draw roller and rewind, reaching up to 200 m/min — the “analog” era. Third-generation digital machines run at 300 m/min and above, with fully digital automatic control, AC vector drives, and PLC-based tension profiling — the “digital” era.
Intelligent Slitting: Hangzhou Dahua’s Approach
Hangzhou Dahua Industrial Control Technology launched its “Little Prodigy II” (小神童Ⅱ) slitter for mainstream flexible packaging converters. The machine uses center-winding architecture with digital control and servo drive, achieving stable operating speeds of 300 to 400 m/min. Unwind diameter is 800 mm, rewind diameter is 500 mm, and minimum slit width is 30 mm. It handles PE, PP, PVC, PET film, paper, and laminates. A dedicated splicing table, waste edge handling system, and knife change mechanism are integrated into the design.
Dahua has since extended the concept into a fully intelligent slitting platform with three embedded expert modules:
- Process Expert: Pre-optimized parameters derived from Dahua’s film-processing database. The system sets tension, knife pressure, and taper curves for each material type automatically — operating like a “point-and-shoot” camera that produces professional results without operator expertise. Manual override remains available for experienced operators.
- Operator Expert: An interactive human-machine interface that guides the operator through job setup, reducing setup errors and enabling consistent output across different shifts.
- Service Expert: Built-in diagnostics display faults with location and suggested corrective actions, minimizing downtime and simplifying maintenance.
High-Speed Digital Slitting: The 500 m/min Standard
Dongguan jjspackage Packaging Co., Ltd. manufactures the GFQ series fully automatic high-speed slitters, rated at 200 to 500 m/min with web widths from 600 mm to 2,200 mm. The machine integrates mechanical, electrical, optical, and pneumatic subsystems into a single PLC-controlled platform.
The electrical system uses a Mitsubishi programmable logic controller with analog and digital I/O for full process control. Rewind tension follows a taper profile based on real-time diameter feedback from a high-resolution pulse encoder. Two Yaskawa inverters with vector control independently drive the main draw roller and rewind spindles. The unwind station features a Mitsubishi automatic tension controller and a Sanqiao automatic photoelectric edge guide with hydraulic lift for the shaftless mandrel loading system. The result: slit rolls with consistent density, straight edges, and no telescoping across the full speed range.
Two knife configurations — shear-cut and razor-cut — are available depending on the substrate. All critical pneumatic, electrical, and mechanical standard components are sourced from international suppliers for reliability. The machine cost is one-third to one-fifth that of comparable imported equipment, while achieving equivalent or superior operating specifications.
The GFQ series has expanded from its original 1,300 mm standard width to a full product line covering narrow 600 mm computer forms slitting up to 2,200 mm wide-format material processing. Speed has increased from 300 m/min to 500 m/min across successive design iterations. Domestic slitter manufacturers continue to narrow the performance gap with European and Japanese equipment, with digital control technology as the defining characteristic of the new generation.
References
- Wikipedia: Slitting (Process): Overview of slitting technology, machine configurations, and web guiding principles.
- Wikipedia: Programmable Logic Controller (PLC): Technical description of PLC architecture used for industrial slitter automation and tension control.
- Wikipedia: Web Tension: Explanation of web tension control principles including taper tension, closed-loop feedback, and dancer roller systems.
- Wikipedia: Variable-Frequency Drive: How AC vector drives control torque and speed in slitter rewind and draw roller applications.
- Flexible Packaging Association (FPA): Industry association providing standards, technical resources, and market data for flexible packaging converters.