You're running a label printing operation, and the biggest challenge is keeping colors in register—especially when switching between materials or running long jobs. A stack flexo printing machine that can't hold registration becomes a source of waste and rework. The HSS-320-4C-UV-S stack flexo label printer from Hongsheng Machinery was engineered with registration precision as the priority: ±0.1mm chromatographic precision, servo motors on each printing station for independent control, and a web guiding system accurate to ±0.02mm. This article walks through what makes this machine capable of delivering consistent, aligned color printing—from the servo-driven stations that hold register without drift to the UV drying that cures inks instantly for immediate handling.
Q: How does the machine maintain registration accuracy across long runs?
A: Each printing station on the HSS-320-4C-UV-S is equipped with its own servo motor. This means each color station can be adjusted independently for speed and register—if one color is slightly off, you don't have to adjust the entire press, just that one unit. The result is ±0.1mm chromatographic precision held consistently across the full run.
Q: What's the advantage of having a servo motor per station?
A: Servo motors provide precise, independent control of each printing station. Instead of a single mechanical drive that can drift or require complex adjustments, each station operates with electronic precision. This reduces setup time, minimizes waste during changeovers, and ensures colors stay aligned even at 100m/min.
The HSS-320-4C-UV-S features each printing station equipped with its own servo motor. This isn't a mechanical drive system that drifts over time—it's electronic control that holds its settings.
With servo motors on each station, you can adjust individual colors without compromising the rest of the press. If magenta is tracking 0.1mm off, you tweak that unit alone. You don't have to recalibrate the entire press or compromise on other colors. The servo system also prevents the thermal drift that occurs when one motor heats up more than others in a shared-drive system.
The machine runs at 100m/min while maintaining ±0.1mm chromatographic precision. Speed doesn't come at the expense of accuracy—the servo-driven system ensures that each station maintains its register regardless of production speed.
The HSS-320-4C-UV-S features each printing station with its own UV dryer and IR dryer. Ink drying is one of the most common sources of slowdowns in label printing—this machine solves both the drying speed and the heat management problems.
UV ink cures almost instantly when exposed to the UV lamp. You don't have to wait for solvent evaporation or worry about ink smearing during finishing operations. Labels go from the printing unit to the optional die-cutting unit fully cured and ready to handle. Each station has its own UV dryer, so curing happens immediately after each color is applied—not just at the end of the press.
Each station also includes an IR dryer, providing additional drying flexibility for different ink types and substrates. This dual drying capability—UV and IR—ensures that the press can handle a wide range of materials and ink formulations without compromising speed.
The HSS-320-4C-UV-S incorporates several design details that contribute to registration accuracy and reliability.
The machine features web guiding precision of ±0.02mm. This level of accuracy ensures that the material stays aligned as it travels through the press, providing a stable foundation for color-to-color registration.
Each station is equipped with a ceramic anilox roller, which offers superior wear resistance compared to chrome-plated rollers. Ceramic rollers maintain their cell volume over longer periods, ensuring consistent ink transfer and color density throughout the roller's service life.
The HSS-320-4C-UV-S is built on a modular design that supports optional finishing modules. This isn't a press that only prints—it can be configured to handle die-cutting, laminating, and waste removal in-line.
The machine supports an optional rotary die-cutting station, allowing you to cut labels as they come off the press. Instead of printing rolls and then sending them to a separate die-cutting operation, you cut in-line—eliminating handling, reducing waste, and speeding up delivery.
Additional optional features include laminating, cold foil, and waste rewinding stations. These options allow you to build a press that matches your exact production requirements—print, laminate, foil stamp, and die-cut in one pass. The modular design means you can start with a basic configuration and add capabilities as your business grows.
| Parameter | HSS-320-4C-UV-S Specification |
|---|---|
| Model | HSS-320-4C-UV-S |
| Colors | 4 |
| Max. Web Width | 320mm |
| Max. Printing Width | 310mm |
| Printing Length | 177.8-368.3mm / 206-460mm / 238-539mm |
| Max. Speed | 100m/min |
| Chromatographic Precision | ±0.1mm |
| Web Guiding Precision | ±0.02mm |
| Max. Unwinding / Rewinding Diameter | 600mm |
| Flexo Plate Thickness | 1.7mm / 1.14mm |
| Drying | UV dryer + IR dryer per station |
| Drive | Servo motor per station |
| Anilox Roller | Ceramic, 1PCS per station |
| Voltage | 380V (50Hz, 3 phases) |
| Pressure | 0.8MPa |
The HSS-320-4C-UV-S serves multiple applications where precise color registration and UV curing are essential:
The press is specifically designed for self-adhesive label production. The combination of ±0.1mm precision, UV curing, and servo-driven registration makes it well-suited for the demands of label converting.
The machine handles a range of flexible packaging materials. The UV drying system is essential for printing on non-porous substrates like films and shrink sleeves, where traditional drying methods won't work.
With independent servo control and quick setup, the press is suitable for both short-run production and prototype development. You can run small quantities without wasting material on setup and changeover.
Q: What is the maximum printing speed of the HSS-320-4C-UV-S?
A: The machine runs at a maximum speed of 100 meters per minute.
Q: What is the printing width range?
A: The maximum printing width is 310mm, with a maximum web width of 320mm.
Q: What printing lengths are available?
A: The machine supports printing lengths of 177.8-368.3mm, 206-460mm, and 238-539mm.
Q: How accurate is the registration?
A: The machine delivers ±0.1mm chromatographic precision and ±0.02mm web guiding precision.
Q: What drying system does the machine use?
A: Each station is equipped with both a UV dryer and an IR dryer.
Q: What optional features are available?
A: Optional features include rotary die-cutting, lamination, cold foil, and waste rewinding stations.
Q: What is the warranty period?
A: The machine comes with a one-year warranty for electric parts (excluding quick wear parts), with whole-life service support.
A stack flexo printing machine that combines servo-driven registration, UV curing, and modular finishing options is the foundation of any efficient label production operation. The HSS-320-4C-UV-S from Hongsheng Machinery delivers ±0.1mm chromatographic precision, independent servo motors on each station, UV and IR dryers per station, and optional die-cutting and laminating modules—all in a press built for self-adhesive label production.
Whether you're printing short-run prototypes or high-volume production runs, the HSS-320-4C-UV-S offers the precision and flexibility that label converters need. With ceramic anilox rollers, ±0.02mm web guiding, and whole-life service support, it's built for consistent quality across every job.
Contact Hongsheng Machinery for a quote or technical consultation → their team can help you select the right configuration, color count, and optional modules for your specific label production requirements. Get a stack flexo press that keeps colors aligned—every time.
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