Full Servo Stack Printing Machinery

Full servo stack printing machinery represents a major advance for flexographic converters who demand repeatable print quality at high line speeds. Each print station is driven by an independent servo motor, so registration adjustments happen digitally rather than through gear trains. This design eliminates backlash, reduces maintenance, and supports fast job changeovers. The equipment is commonly supplied as a Stack type flexo printing machine, where all color units are arranged vertically above the main impression area. A closely related configuration is the Stack type flexographic printing machine, which shares the same space-saving footprint but is optimized for wider web widths. For mid-size operations, the Stack flexo press provides a balance of speed, print length, and energy efficiency, while the Vertical stack flexo press is the preferred choice for thin films and stretchable substrates because its vertical web path minimizes tension fluctuation. These servo-driven systems typically handle materials from 20 to 300 microns, including BOPP, PET, LDPE, paper, and aluminum foil, making them suitable for labels, shrink sleeves, and multi-layer packaging.

The Full Servo Stack Printing Machinery is equipped with a modular base frame, cantilever or through-shaft print cylinders, and a centralized HMI for recipe management. Operators can store up to 1,000 job recipes, and automatic pre-registration cuts setup time to under 10 minutes for a six-color job. The print stations accept both sleeve and conventional plate cylinders, and the enclosed doctor blade chamber systems maintain consistent ink density at speeds up to 300 m/min. Core technical parameters are listed below:

• Max mechanical speed: 320 m/min (model-dependent)
• Printing width range: 600 mm, 800 mm, 1000 mm, 1200 mm
• Color stations: 2 to 10, field-expandable
• Print repeat length: 250 mm to 800 mm
• Substrate thickness: 20 – 300 microns
• Registration accuracy: ±0.05 mm at full speed
• Unwind/rewind diameter: 600 mm, 800 mm, or 1000 mm
• Drying: hot air, infrared, or UV interstation options
• Main drive: independent AC servo motor per station, 2.5 kW to 5 kW
• Control system: centralized PLC with touchscreen HMI

The unwind and rewind sections use closed-loop tension control with load cells, and the servo infeed nip isolates web tension from the printing zone. Interstation dryers are positioned between color units to prevent ink offset at high production speeds. Optional features include turn-bar systems for double-sided printing, cold foil stamping, and lamination units. Standard configurations and speed ratings are summarized in the table below: