The Graphic Arts Technical Foundation and the Foundation of the Flexographic Technical Association present The Flexographic Printing Process. This audiovisual is intended to introduce the viewer to the printing process of flexography and to provide an overview of the versatile flexographic printing industry. Get more news about Flexographic Flat Printer,you can vist our website!
Flexography is one method of printing words and images onto foil, plastic film, corrugated board, paper, paperboard, cellophane, or even fabric. In fact, since the flexographic process can be used to print on such a wide variety of materials, it is often the best graphic arts reproduction process for package printing.
Flexography is related to the oldest printing process, letterpress, because both flexography and letterpress print from a raised image. In its original form, letterpress used individual metal characters called types and a mechanical press. The type was combined to form words and sentences and tightly arranged on the flat surface of the press. Then the raised areas were covered with ink. The message was formed when paper was pressed against the flat metal type.
Since only the raised areas of the type, which print the message, are touched by the ink, they are called the image areas. The areas that are lower than the image areas do not receive any ink, and do not print. They are called the nonimage areas.
To speed up the slow process of pressing flat surfaces together, the printing press evolved from printing on a flat surface only to using a rolling cylinder, as with this cylinder press on the left. The type moved back and forth between inking rollers and an impression cylinder, which held the paper. To help meet the growing demand for printed products, printing from inked type soon moved to printing from an inked plate. Rotary letterpress prints from a molded or etched metal plate like the one on the right.
Flexography prints from a flexible printing plate that is wrapped around a rotating cylinder. The plate is usually made of natural or synthetic rubber or a photosensitive plastic material called photopolymer. It is usually attached to the plate cylinder with double-sided sticky tape.
Flexography was first called aniline printing because early flexographic inks contained dyes derived from aniline oil--a liquid extracted from the indigo plant. These dyes were dissolved in spirits, making a quick-drying ink. The combination of a flexible plate, quick-drying ink, and the ability to print on such a wide variety of materials or substrates made this process excellent for package printing.
The invention of cellophane in 1930 started a revolution in modern packaging. This clean, nonabsorbent film could not be practically printed by any other printing process. But flexography's quick-drying inks were excellent for this new material. Cellophane gave a tremendous boost to package printing along with polyethylene, a stretchy, synthetic plastic that became popular in the early 1950s.
Publicado en Free Packages en febrero 23 at 11:03
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