A stack type flexographic printing machine uses several printing units arranged vertically on one frame. The web passes through these units in sequence, allowing different colors to be printed during one continuous process. At the same time, the unwinding unit feeds the material into the press, while the rewinding unit collects the finished roll.
The machine includes an unwinding system, printing units, transmission parts, registration adjustment, and a rewinding system. In addition, different models use different numbers of color groups and support different web widths. Therefore, the production requirement determines the suitable configuration.
Stack Type Flexographic Printing Machine Parameters
| Item | YG 3205-Color Stack Flexo | YG 4501-Color Stack Flexo | YG 5202-Color Stack Flexo | YG 9504-Color Flexo | YG 10506-Color(3+3) Stack Flexo | YG 4508-Color Petal Dual Servo Flexo | YG GR12-Color High-speed Gravure |
| Max. Web Width | 320 mm | 450 mm | 520 mm | 960 mm | 1050 mm | 460 mm | 1050 mm |
| Max. Printing Width | 310 mm | 440 mm | 510 mm | 950 mm | 1040 mm | 440 mm | 1050 mm |
| Print Repeat Length | 180.975 444.5 mm | 180.975 444.5 mm | 180.975 444.5 mm | 180.975 444.5 mm | 180.975 444.5 mm | 180.975 501.65 mm | Φ110 Φ410 mm |
| Max. Unwinding / Winding Diameter | 600 mm | 600 mm | 600 mm | 1200 mm | 1200 mm | 600 mm | Φ600 mm |
| Max. Printing Speed | 0 80 m/min | 10 70 m/min | 0 100 m/min | 0 100 m/min | 0 80 m/min | 0 150 m/min | 50 200 m/min |
| Registration Accuracy | ±0.1 mm | ±0.12 mm | ±0.1 mm | ±0.12 mm | ±0.1 mm | ±0.1 mm | Longitudinal ±0.1 mm |
| Color Groups | 5 colors | 1 color | 2 colors | 4 colors | 6 colors(3+3) | 8 colors | 12 colors |
| Substrates | 30 300gsm paper | Paper, film | Paper, film, aluminum foil | 30 350gsm paper | 30 300gsm paper | Paper, PET, BOPP | Paper, PET, OPP, BOPP, PE & films |
| Power Supply | 380V 3PH 50Hz | 380V 3PH 50Hz | 380V 3PH 50Hz | 380V 3PH 50Hz | 380V 3PH 50Hz | 380V 3PH 50Hz, ~150kW | Total 280kW |
Working Principle of a Stack Flexo Printing Machine for Plastic Film
The unwinding section releases the web at a controlled speed. After that, the material enters the first printing unit, where the plate transfers one color onto its surface. It then moves through the following units for the remaining colors.
Each unit handles one color during the printing process. As a result, the complete image can be produced while the web continues moving through the machine. Meanwhile, the transmission system keeps the printing units working in sequence.
Registration controls the position of each color in relation to the others. Therefore, print repeat, transmission, and registration adjustment all affect the final alignment. For film applications, the required substrate and web dimensions also need to match the selected machine.
Core Structure of a Multi-color Stack Type Flexo Printing Press
The stack design places the printing units vertically on the main frame. This arrangement keeps the color groups within one continuous web path instead of requiring separate machines for different colors.
The printing units, transmission system, unwinding section, and rewinding section work together during production. In addition, the machine uses registration adjustment to maintain the relative position of each color.
The available configurations cover different production widths and color requirements. For example, the series includes 1-color, 2-color, 4-color, 5-color, and 6-color 3+3 configurations. The 8-color petal unit type and 12-color gravure model are also listed in the specification range.
Printing Accuracy of a High Speed Stack Type Flexo Printer
Registration accuracy determines how precisely the printed colors remain aligned during production. The listed stack flexo models provide ±0.1 mm or ±0.12 mm registration accuracy. In particular, YG-320, YG-520, and YG-1050 are specified at ±0.1 mm.
The print repeat also needs to match the required pattern. The main stack flexo models use a print repeat range of 180.975–444.5 mm, while the 8-color petal unit model covers 180.975–501.65 mm.
In addition, the transmission system uses a 1/8 CP gear specification with a 3.175 pitch. The main models use 20CrMnTi high-precision ground gears with a stated hardness of 58. For higher-speed production, YG-520 and YG-950 both have a design speed of 0–100 m/min.
Model Selection for an Economical Stack Flexo Printing Machine
Model selection starts with the actual printing requirement rather than the machine name. First, confirm the number of colors required for the finished product. Next, check the web width, printing width, print repeat, and substrate.
Roll diameter should also match the planned production process. For instance, some models support 1200 mm unwinding and winding diameters, while others use 600 mm. Therefore, the roll specification can affect which configuration fits the production line.
An economical stack flexo printing machine should also avoid unnecessary capacity. A machine with more color groups or a wider web specification is not automatically suitable if the production order does not require those features. Instead, the configuration should correspond to the actual product specification and expected output.
A 4-Color Flexo Printing Machine Case in the USA
A customer in the United States required a 4-color web flexo printing machine for continuous production. The main requirement was a wide printing format together with four-color printing.
YG configured the YG-950 for this application. The machine matched the customer’s required color arrangement and working width, while its operating specification also supported the planned continuous production process.
This case demonstrates why several production inputs need to be considered together. The required colors define the printing-unit arrangement, while the product width determines the usable printing width. After that, print repeat and production speed help complete the machine configuration.
YG Machinery Direct Manufacturer and Quality Control
YG Machinery is a source manufacturer of printing machinery producing different flexographic printing machines and related equipment. For export orders, buyers can check the technical and certification documents required for their machine and destination.
The exact document set depends on the model and order requirements. Therefore, buyers should confirm these documents together with the technical specification before shipment.
YG Machinery can provide the corresponding machine configuration, technical data, certification documents, and quotation according to the required printing width, color number, substrate, print repeat, and production conditions.
FAQ
How much installation space does the machine require?
The required space depends on the selected model and its complete configuration. In addition, the layout should leave room for material handling, electrical connections, machine access, and routine maintenance.
What power supply does the machine require?
The main stack flexo models listed in the table use a 380V, three-phase, 50Hz power supply. However, the required electrical specification should be confirmed against the selected model and the local power standard.
Can YG Machinery arrange shipping for overseas orders?
Yes. YG Machinery can provide the machine information and export documents required for an overseas order. Shipping arrangements can then be discussed according to the destination and delivery terms.
