Vertical stack flexo press

The vertical stack flexo press delivers a compact, high-efficiency configuration for flexible packaging, paper bag, label, and multi-wall sack production. This press is frequently categorized as a Stack type flexo printing machine because its color decks are arranged in a vertical stack rather than in a line. The resulting footprint is significantly smaller, which makes it easier to install in mid-size converting plants. When comparing equipment for extensible films and lightweight papers, many production managers specify a Stack type flexographic printing machine to gain stable web tension and faster plate changes. The central impression cylinder, combined with independent servo-driven print stations, allows the press to hold tight registration even when running at high speeds. For operations that require rapid turnaround on short runs, a Stack flexo press offers a practical balance of cost, output, and print quality. Converters that focus on paper-based products, such as shopping bags, wrapping paper, and corrugated liner, often choose the Stack type paper printing machine variant to reduce ink misting and maintain clean solids. The modular design supports 2 to 8 color stations, making it adaptable for both line work and process color jobs. Heavy-duty side frames, precision-ground rollers, and automated viscosity controls contribute to consistent color density over long production runs. This configuration also reduces the number of idler rollers, which lowers web tension fluctuation and improves fine highlight dot reproduction. The press can be fitted with an inline corona treater, web cleaner, and automatic viscosity control to meet stringent food packaging standards.

The Vertical Stack Flexo Press series is engineered for converters who require repeatable color-to-color registration on films, paper, and laminates. Each printing station includes an enclosed doctor blade chamber, pneumatic ink feed, and independent AC servo motor. The central control panel with touchscreen HMI stores up to 500 job recipes and manages automatic pre-registration, tension, and dryer temperature. The press accepts a wide range of substrates, including BOPP, PET, PE, kraft paper, and aluminum foil, with thickness from 20 to 300 microns. Quick-change anilox sleeves and plate rolls reduce setup time to under 15 minutes per color station. All rollers are dynamically balanced to ISO 1940 G2.5, and the impression cylinder is protected by an automatic lubrication circuit. A closed-loop tension system with load cells maintains web stability from unwind to rewind. The semi-automatic turret unwind and rewind units support continuous operation with minimal downtime. The press is compatible with water-based, solvent-based, and UV-curable inks. Standard and optional configurations are listed below.

• Color stations: 2, 4, 6, or 8 (custom configurations available)
• Max web width: 600, 800, 1000, 1200, 1400, or 1600 mm
• Max printing width: 560–1560 mm depending on web width
• Print repeat length: 300–800 mm with 1/4 CP or 1/8 CP gear pitch
• Max mechanical speed: 150 m/min (printing speed depends on substrate and ink)
• Registration accuracy: ±0.10 mm longitudinal, ±0.15 mm lateral
• Unwind/rewind diameter: 600 mm, 800 mm, or 1000 mm optional
• Dryer temperature: up to 80°C with hot air, infrared, or UV modules
• Tension control: closed-loop with load cells, 10–100 N adjustable
• Anilox roller lines: 200–600 LPI, ceramic-coated available
• Impression roller: 300 mm diameter, dynamically balanced to ISO 1940 G2.5
• Electrical supply: 380V/50Hz three-phase, other voltages available
• Compressed air: 0.6 MPa, 500 L/min consumption
• Machine dimensions (L×W×H): 4.2 m × 2.1 m × 3.5 m for 6-color 1000 mm model