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Choosing a suitable flexographic printing press is critical to lifting shop productivity and maximising your return on investment. Drawing on over two decades of expertise within the printing and packaging sector and a network of more than 500 global partners, Puji Machinery (www.pujimachinery.com) has prepared this comprehensive buyer’s guide focusing on stack-type (tower-type) flexo printing machines to support your well-informed equipment selection.
▲BFYT-B stack type flexo printing machine
Core Structure: Vertically Stacked Independent Units
The stack flexo printing machine arranges each printing unit (plate cylinder, anilox roller, impression cylinder) vertically stacked on the main wall panel, like building blocks. Substrate enters from the bottom and moves upward through each color station, finishing at top rewind. Puji’s stack type is compact, cost-effective, and flexible for moderate-quality needs.
Working Principle (Step-by-Step)
- Unwind: Roll fed from bottom.
- Layer print & dry: Each unit prints one color then passes IR/UV dryer.
- Registration: Via independent gear or servo, 360° alignment possible.
- Rewind: Printed web collected at top.
Modern Puji uses PLC control, ceramic anilox, and modular drying.
▲BFYT-B stack type flexo printing machine printing unit
Detailed Advantages & Limitations
✅ Advantages
- Low cost: 30%–50% cheaper than CI/inline flexo printing machine.
- Small footprint: Vertical layout saves 35%–45% floor vs horizontal.
- Dual-side print: Guide rollers enable front/back in one pass.
- Easy maintenance: Open access, 10‑min plate change.
- Wide substrate: Film (12μm–400g/m²), paper, woven, non-woven.
❌ Limitations
- Registration: Traditional ±0.3~0.5mm; Puji servo models reach ±0.05~0.15mm.
- Speed: General 80–150 m/min; narrow models 15–60 m/min. High-end servo up to 300–500 m/min.
- Tension: Multi-layer path causes fluctuation, poor for ultra-thin stretch film.
- Drying: Short inter-color distance may cause incompleteness with water ink.
▲BFYT-B stack type flexo printing machine printing unit
Technical Parameter Table (Typical & Puji-Compatible)
| Item | Standard Stack Flexo Printing Machine | Puji / Servo Stack Flexo Printing Machine |
|---|---|---|
| Colors | 2–8 (max 10) | 2–10 modular |
| Web width | 320–2200 mm | 600–2000 mm |
| Speed | 70–150 m/min | 50–500 m/min |
| Registration | ±0.3~0.5 mm | ±0.05~0.15 mm |
| Substrate | Paper, film, woven | +BOPP/PE adapt |
| Dry | IR | IR+UV+hot air |
Best Fit Applications
- Suitable: Plastic/woven/kraft bags, non-woven eco bags, simple text/block, SME batches.
- Not suitable: High-end food film (±0.1mm), fine labels, pharma with strict precision.
- Puji case: Bag, non-woven, kraft 25–50kg industrial.
▲BFYT-B stack type flexo printing machine rewinding unit
Comparison with Satellite & Inline Flexo Printing Machine
| Type | Stack Flexo Printing Machine | Satellite (CI) Flexo Printing Machine | Inline Flexo Printing Machine |
|---|---|---|---|
| Structure | Vertical stack | Around big drum | Horizontal |
| Registration | ±0.15~0.5mm | ±0.1mm | ±0.1~0.2mm |
| Speed | 80–150 (up to 500 servo) | 200–300+ m/min | 150–250 m/min |
| Dual-side | Yes | No | Partial |
| Price | Lowest | Highest | Mid-high |
| Material | Thick paper, woven, film | Thin film, soft pack | Labels, paper |
Detailed Selection by Industry & Material
- Food paper bags/cups: Water-based stack flexo printing machine, compact, double-side; Puji B series economical.
- Non-woven bags: Stack flexo printing machine for flexibility, small-batch; Puji 500+ partner cases.
- Woven/cement/kraft: Stack flexo printing machine handles 25–50kg; Puji industrial.
- PE/BOPP thin film: Not general stack; use CI flexo printing machine (Puji ±0.1mm).
- Budget/space limited: Stack B-F $15k–100k, quick ROI.
Why Puji Machinery (20+ Years, 500+ Partners)
Puji has 20+ years R&D, 500+ clients in 50+ countries, ISO/CE & 50+ patents. Stack flexo printing machines (BFYT-B, B-F) offer proven ROI. Visit www.pujimachinery.com for consultation.
