Plastic printing machine Stack Flexo

for paperfor plastic filmfor textiles

Overview
Stack flexo printing presses are widely used in flexible packaging production. Choosing the right stack flexo printing machine depends on matching substrate tension with web width. Compared with large CI presses, stack models provide a compact vertical footprint and typically incur over 30% lower purchase and maintenance costs. Typical production speeds range from 40 to 150 m/min. The independent vertical unit structure allows quick plate changes and one-side access to ink systems. Machine height commonly ranges between 2.6 and 4.0 m.

Applications

• Plastic film packaging: suitable for PE films, shrink films and pouch bags; commonly used as a flexo printing machine for T-shirt bags and other plastic bags.
• Non-woven bags: efficient for vivid designs on eco-friendly non-woven bags with strong ink adhesion.
• Paper bags & cups: roll-to-roll multi-color printing on food-grade kraft paper, tissue and paper cup stock.
• Woven sacks & heavy bags: delivers clear logos and solid coverage on PP woven sacks for cement, feed and industrial materials.

Comparison (press types)
Press Type | Printing Speed | Register Accuracy | Footprint | Machine Cost | Best Suited Materials
Stack flexo printing machine | 40–150 m/min | ±0.1–0.2 mm | Very small (vertical) | Low | Thick films, paper, non-woven, woven sacks
Inline flexo printing machine | 100–300 m/min | ±0.1 mm | Large (horizontal line) | Medium | Labels, folding cartons, inline die-cutting
CI flexo printing machine | 200–400 m/min | ±0.05 mm | Medium | High | Ultra-thin stretch films, high-precision food pouches
Digital printing machine | 10–50 m/min | No registration needed | Small | Low (zero plate cost) | Short-run proofing, variable barcodes

Key buying checklist

• Anilox roller LPI: 200–300 LPI for solids; 500–800 LPI for fine graphics.
• Doctor blade system: prefer a chambered double doctor blade to reduce ink splash and speed cleaning.
• Drying system: inter-color hot air dryers plus a final drying tunnel to prevent ink smudging.
• EPC & tension: Edge Position Control and automatic tension control are essential for web alignment during rewinding and high-speed runs.

Additional product features & operational notes

• Vertical color units save floor space and allow plate and ink access from a single side.
• Typical production speed: 40–150 m/min; register accuracy often ±0.1–0.2 mm on stack models.
• Supports multi-color and double-sided printing using turnbars (configurations such as 4+2, 3+3, 5+1 possible).
• Common options: pneumatic anilox rollers, automatic tension controllers, video inspection systems, corona treaters for film adhesion.
• Maintenance: flush ceramic anilox rollers with water-based cleaner after each run; perform ultrasonic cleaning monthly for consistent cell performance.
• Ink choices: water-based inks are cost-effective for paper, non-woven and general plastic bags; UV inks cure instantly with high gloss and require UV lamps.

FAQ

• Can a stack flexo printing machine print on both sides? Yes. Turnbars can be installed between vertical color units to enable double-sided printing in a single pass.
• How often should ceramic anilox rollers be cleaned? Rinse with a water-based cleaner after each run and perform ultrasonic cleaning monthly to remove dried ink from cells.
• What is the difference between water-based and UV inks for this machine? Water-based inks are lower cost and suitable for paper, non-woven and many plastic bags; UV inks cure instantly with higher gloss but require UV curing equipment.

Caractéristiques / spécifications techniques

• Model / denomination: Stack Flexo Printing Machine (vertical stacked color units)
• Typical production speed: 40–150 m/min
• Register accuracy: approximately ±0.1–0.2 mm (typical for stack presses)
• Footprint: very small vertically (saves floor space); typical machine height 2.6–4.0 m
• Suitable substrates: thick films, paper, non-woven, woven sacks, heavy bags
• Common configurations: multi-color (4–6 colors typical), double-sided via turnbars (4+2, 3+3, 5+1 etc.)
• Recommended anilox LPI: 200–300 LPI for solids; 500–800 LPI for fine graphics
• Doctor blade: chambered double doctor blade system recommended
• Drying: inter-color hot air dryers and a final drying tunnel recommended
• Tension control: automatic tension controllers and Edge Position Control (EPC) recommended for web alignment
• Optional equipment: pneumatic anilox rollers, video inspection system, corona treater for film surfaces
• Maintenance tip: ultrasonic cleaning for anilox rollers monthly; flush after each run