Central drum flexo printing machine

The CI flexo printing machinery segment has become the preferred choice for high-speed flexible packaging production, and the central drum configuration leads this category by delivering exceptional register stability on thin, stretchable substrates. A central impression flexo printing machine mounts all color stations around a single large-diameter drum, which holds the web firmly and prevents mis-register caused by web flutter or tension variation. Built as a robust CI flexographic printing machine, the system supports up to 10 colors with fast job changeovers and repeat lengths from 320 mm to 1,000 mm. Compared with conventional inline or stack configurations, a CI flexo press provides tighter color-to-color registration, lower waste during acceleration, and better print quality on films as thin as 12 μm. Typical applications include flexible packaging, shrink sleeves, lidding film, and paper labels.

The central drum flexo printing machine is engineered around a precision-ground, double-wall central drum with constant temperature control, ensuring dimensional stability across long runs. Each print deck features a gearless direct-drive servo motor, fully enclosed chambered doctor blade, and independent drying system for consistent ink laydown at speeds up to 400 m/min. The machine accepts shaftless unwind and rewind stands with web guide systems, corona treatment options, and video inspection. Its frame is cast iron and stress-relieved, while the central drum is nickel-phosphorus coated for corrosion resistance. The gearless design eliminates gear pitch marks and allows infinite repeat length adjustment between 320 mm and 1,000 mm. The chambered doctor blade system maintains consistent ink density, and the independent servo drives enable pre-register setup and automatic register control during production. The precision ground drum surface with nickel-phosphorus coating minimizes dot gain and improves ink transfer, resulting in sharper text and smoother vignettes on flexible films. Key product parameters are summarized below.

• Print width: 850 mm / 1,050 mm / 1,250 mm / 1,450 mm
• Color stations: 4 / 6 / 8 / 10, expandable in the field
• Max mechanical speed: 400 m/min
• Typical printing speed: 300–350 m/min on 12–100 μm film
• Central drum diameter: 1,000 mm / 1,200 mm / 1,400 mm
• Register accuracy: ±0.05 mm
• Repeat length: 320–1,000 mm with lightweight sleeves
• Substrate thickness: 12–150 μm (PE, BOPP, PET, CPP, paper, aluminium foil)
• Unwind / rewind diameter: 800 mm or 1,000 mm, shaftless hydraulic
• Drying: electric, gas, or thermal oil with inter-color and tunnel dryers
• Doctor blade system: enclosed chamber, quick-change cartridge
• Tension control: closed-loop AC vector drives with automatic splice option
• Web guide accuracy: ±0.1 mm, ultrasonic edge or line guide
• Corona treatment: optional, 1–2 kW, ceramic electrode