For converters and packaging printers evaluating flexographic equipment, a stack press design provides a practical balance of print quality, accessibility, and cost per square meter. Our production range includes the Stack type flexo printing machine for standard flexible packaging films, the Stack type flexographic printing machine for higher-tension webs and heavier board, the Vertical stack flexo press for compact installations with vertical color stations, and the Stack type paper printing machine tuned for coated paper and label stock. Each model shares independent print decks, allowing operators to wash up, change sleeves, or adjust impression without rethreading the entire web path.
The Stack Flexo Press is built for mid-web converting operations that demand consistent registration, fast turnaround, and reliable handling of a wide substrate range. Its vertical stack arrangement organizes each print station above the main frame, allowing the web to travel upward through individual nips. This design eliminates the need for a central impression drum and keeps every deck fully accessible for cleaning, sleeve changes, and maintenance.
Standard machine parameters are shown in the table below:
| Parameter | Standard Configuration |
|---|---|
| Maximum web width | 850 mm / 1050 mm / 1250 mm |
| Printable width | 820 mm / 1020 mm / 1220 mm |
| Print repeat length | 300 mm – 800 mm |
| Number of color stations | 2 – 8 (stacked arrangement) |
| Maximum mechanical speed | 150 m/min |
| Typical production speed | 120 m/min depending on substrate and ink |
| Substrate thickness - paper | 60 – 300 gsm |
| Substrate thickness - film | 20 – 100 micron |
| Unwind / rewind diameter | 800 mm / 800 mm |
| Drying options | Hot air, IR, or UV inter-color and final |
| Register adjustment | Motorized longitudinal / lateral ±10 mm |
Key engineering features include:
Web tension is divided into multiple zones between the unwind, each print deck, and the rewind. Low-inertia rollers and load cell feedback prevent stretch on extensible films and maintain stable repeat length on paper. The open vertical design also allows easy threading of the web during initial setup, reducing downtime on job changeovers.
Beyond the core build, the Stack Flexo Press supports a wide material envelope, including BOPP, PET, PE, aluminum foil, paperboard, and self-adhesive label stock. Its short web path between stations reduces ghosting and dot gain, while the robust drying capacity handles high-opacity white inks and heavy solids. For short-run environments, sleeve-based changeover can be completed in under 20 minutes per color, making the machine practical for converters managing multiple SKUs.
Control is managed through a PLC with touchscreen HMI, offering recipe storage, automatic impression settings, and remote diagnostics. Servo-driven print decks maintain register accuracy within ±0.1 mm at full speed. An optional pre-register system uses optical sensors to set print-to-print registration during make-ready, reducing setup waste to less than one web length. Safety interlocks on access doors, automatic stop on web break, and guarded nip points meet CE and OSHA requirements, while a centralized lubrication system keeps maintenance intervals predictable.
Performance advantages of the Stack Flexo Press:
Available options include turn-bar systems for double-sided printing, cold foil transfer stations, lamination units, and chill rollers for heat-sensitive films. The machine can be configured with either shafted or shaftless unwind/rewind, automatic splicing, and inline slitting. For converters targeting food packaging, all ink and coating systems can be specified for low-migration compliance.
