You're running a label converting operation—producing self-adhesive labels, flexible packaging, or roll-fed stickers for food, beverage, or industrial markets. The printing stage needs to be fast enough to meet deadlines, versatile enough to handle different materials, and precise enough to satisfy brand color standards. A stack flexo printing machine offers exactly that combination: vertical printing units that save floor space, roll-to-roll feeding for continuous production, and the flexibility to print on paper, film, and foil with consistent registration. This guide covers the key capabilities—printing speed, substrate range, drying options, and servo control—so you can evaluate whether a 3-color stack flexo press is the right addition to your production floor.
A stack-type flexographic printing press places each color station vertically above the others, with each unit having its own impression cylinder. The substrate—paper, film, foil, or sticker stock—passes through each station, picking up one color at a time through an anilox roller system. This vertical configuration saves valuable floor space compared to horizontal presses, making it ideal for facilities where square footage is at a premium. The HSS-320-3C is a 3-color machine equipped with a single die-cutting station and three UV dryers, with each printing station having its own UV dryer.
Flexographic printing uses flexible photopolymer or rubber plates mounted on rotating cylinders. The plate picks up ink from a ceramic anilox roller and transfers it directly to the substrate. This makes flexo faster to set up, more cost-effective for medium runs, and capable of printing on a broader range of materials than gravure or offset.
The vertical stacking of color stations is the defining feature. Unlike CI (central impression) presses that require a large central drum, stack-type presses fit into tighter spaces while still delivering full multi-color capability. Each unit has its own impression cylinder, allowing independent adjustment of each color station.
In label printing, registration accuracy determines whether the finished product looks professional or defective. The HSS-320-3C uses a latest servo control system where each unit is driven by a servo motor, providing high-precision register even at high speeds. The machine also features 360° registration capability, allowing fine adjustment of each color station independently.
Each printing unit has its own servo motor. This independent control allows precise adjustment of each color station, ensuring that every color aligns perfectly with the others—even when running at production speed.
The 360° registration system simplifies setup and reduces waste during job changeovers. Operators can fine-tune each color station's registration without stopping the machine, minimizing downtime between jobs.
A printing press is only as valuable as the range of materials it can handle. The HSS-320-3C supports a wide variety of substrates, including sticker stock, paper, and aluminum foil. Stack-type flexo presses are known for their ability to print on diverse materials, including plastic films, paper, non-woven fabrics, and aluminum foil.
The machine is designed for label production—self-adhesive labels for food, beverage, personal care, and industrial products. It can also handle flexible packaging materials for pouches, sachets, and wrappers.
Stack-type flexo presses can handle thicker and more rigid substrates than some other press types, including cardboard and metal foil. This versatility makes the machine suitable for applications beyond traditional labels—think folding cartons, rigid boxes, and specialty packaging.
Drying is critical for maintaining print quality and preventing smudging or set-off. The HSS-320-3C is equipped with three UV dryers, with each printing station having its own UV dryer. UV drying cures inks instantly, enabling faster production speeds and better adhesion on non-porous substrates like film and foil. For applications requiring different drying characteristics, IR drying is also available on other configurations in the HSS series.
UV drying is essential for printing on films, foils, and other non-porous materials where solvent-based or water-based inks would take too long to dry. The UV lamps cure the ink instantly, allowing the printed material to be rewound or further processed immediately.
Infrared drying is effective for paper and cardboard substrates where heat absorption is faster. The HSS-320-3C’s UV configuration is optimized for label applications on film and foil substrates.
Beyond printing, the HSS-320-3C is equipped with a single die-cutting station. This allows labels to be cut to shape immediately after printing, eliminating a separate finishing step. The machine can be customized with additional options including slitting, laminating, and conveyor functions.
The integrated die-cutting station cuts labels to their final shape as they come off the press. This eliminates a separate offline finishing step, reducing handling and speeding up the overall production cycle.
Beyond die-cutting, the HSS series supports optional modules including slitting (for splitting wide rolls into narrower ones), laminating (for applying protective or decorative layers), and turn bar systems for printing on both sides of the substrate.
| Specification | HSS-320-3C Value | Why It Matters |
|---|---|---|
| Number of colors | 3 | Matches your design complexity |
| Printing width | 320mm | Determines maximum label size |
| Drying system | 3 UV dryers (one per station) | Enables printing on film and foil |
| Die-cutting stations | 1 | In-line finishing capability |
| Registration | 360° with servo control | Ensures color-to-color accuracy |
| Control system | Servo motor per unit | Precision at high speed |
| Substrates | Sticker, paper, aluminum, film | Production flexibility |
What substrates can this machine handle?
The HSS-320-3C handles sticker stock, paper, and aluminum foil. Stack-type flexo presses can also print on plastic films, non-woven fabrics, and other flexible materials.
How does UV drying improve production?
UV drying cures inks instantly, allowing faster production speeds and better adhesion on non-porous substrates like film and foil. Each printing station on the HSS-320-3C has its own UV dryer.
What is the registration accuracy?
The servo control system provides high-precision register even at high speeds, with 360° registration capability for fine adjustment of each color station.
Can I add more finishing options?
Yes. The machine supports optional modules including slitting, laminating, and conveyor functions.
Selecting a stack flexo printing machine comes down to three factors: number of colors (match your design complexity), substrate range (match your material mix), and finishing requirements (match your production workflow). Contact Hongsheng Machinery for a customized quote → —their team can help you select the right HSS series configuration for your specific label production needs.
Hongsheng Machinery is a manufacturer of flexographic printing and label converting equipment. The 3 Colors Stack Flexo Printing Machine for labels (HSS-320-3C) features a 3-color stack-type configuration with servo-driven each printing unit for high-precision register, 360° registration capability, three UV dryers—one per printing station—and a single die-cutting station. The machine handles substrates including sticker stock, paper, and aluminum foil, with optional slitting, laminating, and conveyor functions available. Hongsheng Machinery provides comprehensive technical support, installation guidance, and after-sales service. Connect with Hongsheng Machinery to discuss your color requirements, substrate specifications, and production volume targets.
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