Here's how a stack flexo printing machine generally works:
Material Feed: The material to be printed is fed into the machine. This could be a roll of paper, film, or another flexible substrate.
Printing Units: In a stack flexo printing machine, multiple printing units are stacked on top of each other. Each printing unit contains a set of printing cylinders or sleeves, ink systems, and anilox rolls. Each unit is responsible for applying a specific color or ink type.
Plate Cylinder: Each printing unit has a plate cylinder onto which the printing plate is mounted. The plate cylinder transfers the image from the plate to the material.
Inking System: The inking system within each printing unit controls the amount of ink transferred to the printing plate. This ensures consistent and accurate color application.
Anilox Roll: An anilox roll is a specialized roll covered in tiny cells that carry and meter the ink to the plate. It helps control the amount of ink applied to the plate and, subsequently, to the material.
Impression Cylinder: The impression cylinder presses the material against the plate cylinder, transferring the inked image onto the substrate.
Drying or Curing: After printing, the printed material may pass through drying or curing units, depending on the ink type used. This step ensures the ink sets and adheres properly to the substrate.
Repeat for Each Color: If the design requires multiple colors, the material will pass through each printing unit in the stack to apply the various colors.
Stack flexo printing machines are commonly used in the packaging industry for printing on materials like flexible packaging, labels, corrugated cardboard, and more. The stacked arrangement of printing units allows for efficient and high-quality multi-color printing, making these machines suitable for a wide range of applications.
