Flexography printing has been used for years on packing supplies and materials. From corrugated cardboard boxes, to milk containers, plastic cups and bags. It even has some other commercial printing uses, such as envelopes, labels and newspapers. They are also environmentally friendly, as they tend to use water-based instead of oil-based inks. There are five types of flexography printers, each with different uses or feeding methods.
      Stack Type
According to Printers' National Environmental Assistance Center, "The stack press is characterized by one or more stacks of printing stations arranged vertically on either side of the press frame." The pros of this machine is that it can be easily used and set up, and can print on both sides. It is the favorite printer for milk cartons, however it has few other uses because of its downfall. Poor image registration provides inconsistent images, in placement and in color.
      Central Impression Cylinder (CIC)
Great for color consistency, this printer is made from one central cylinder with two to eight color stations surrounding it. When the plate housing your image comes into contact with the central impression cylinder, it remains there until the impression is made. This is why it is great for color consistency and image placement. It is favorable for printing flexible films.
      In-Line
Similar to the Stack type, the only difference construction wise is the printing stations are arranged horizontally. One common line shaft drives the entire printer. Usually fitted with cutting and folding mechanisms, this printing press is the favorite for bags and cardboard boxes. This type provides better image registration and tends to be faster as well.
      Newspaper Flexographic Press
Built from multiple printing stations, doubled up to provide printing on both sides of the plate with one pass. According to PNEAC, this printer can be fitted with, "Single and double color decks, stacked units, or four-, five- or six-color units . . ." Great for speed, image consistency and accuracy, this printer is useful for newspapers, as the name implies.
      Commercial Publication Flexographic Press
These compact, high-speed presses utilize wide plates with dedicated four to six color units. Usually there are two color units paired together so that you can easily print on both sides of the plate. They are usually fitted with infrared dryers, as to ensure that the water based ink dries correctly. These presses are great for commercial printers dealing with businesses, printing stationery and other business necessities.