Flexographic printing.

07 February

Flexographic printing.

The unique method of printing , the name of which is derived from the Latin "flexibilis", or flexible, is the impression produced by liquid paints with a high degree of drying. The matrix of such seals, as a rule, represents the cylinder with various length of a circle on which the form made of highly elastic material is established.

The term flexography got his life September, 1966. From the homeland, Germany, the flexography got over to France and other countries of the world. Today, this method of printing is common in the field of image on the polyethylene, paper, corrugation, foil.

Traditionally it is considered that the first application of this sort of the press is dated the 19th eyelid, by means of it the first prints on wallpaper were received. However, the progenitor of this method is still called some Holvego Karl, head of a major engineering company.

The wide area of distribution of a flexography was caused by a number of the advantages, which were favorably distinguishing this way from the seals executed from a tree or metal habitual in those days. The first serious stage in the development of flexographic printing is considered to be 1912, when the S. A. Cellophane factory made the bright bags with unusual prints obtained using aniline dyes. Already in 1929, due to the high precision flexographic printing has been used for the manufacture of phonograph records and machines for quick packing bread and cigarettes.

In post-war years the flexography received a new round of the development and was applied for prints of school notebooks and other documentation. Release of big circulation of books in paper covers became the real break. German publishing company Rowohlt Verlag sharply cut the price of its products, thereby greatly stand out among competitors in those years. Later the flexography was used for release of envelopes and disposable tableware.

The main feature of a fleksforma is its flexibility and high sensitivity. Under low pressure drawing is easily transferred to the sealed surface. Simplicity of the method is bordered by a huge amount of copies and depth of the resulting image. The photopolymeric form allows to release some millions of prints even on materials with the rough texture and "floating" thickness. Such printing allow us to apply various types of paints, they are environmentally friendly and have the possibility of combining many processes like laminating and cutting dies in a single system.

Printed form, usually made of rubber or photopolymer material organized so that attractively form performed over the rest of the surface of the workpiece;

Cellular anilox roller transfers the ink to all convex portions form, an ink supply level varies depending on the quality and type of product imprinting. The word "anilox" comes from the dye used previously. Today the flexography is made by safe, viscous paints, which are usually diluted with water.

Traditionally, rotary longline, sectional and planetary machines make the flexography. Machinery of longline type belong to the oldest machines for flexoprinting, printed here the units are placed one above the other, in tiers. Such machines are used for thick materials without the need of obtaining complex color image.

In the sectional machines each printed node corresponds to a particular color printing, printing cylinders are arranged in a horizontal plane. These machines are used for printing on large-sized surfaces using special devices tension for more clear and precise alignment of the colors used.

Planetary machines fully comply with this name , printing cylinders are arranged around a common center of the cylinder In this type of printing the processed surface is not stretched, but simply moves around the previously mentioned cylinder. That is why such systems are used for thin plastic or for combining a large number of shades.

The paint used for flexographic print is divided into two main types fixed by the absorption and evaporation. The most common and environmentally friendly are considered water-soluble compounds, they are used for absorbent surface such as cardboard or paper. However, their main disadvantage is the opacity of the resulting print and cost recovery flexographic products of this kind.

The paints on the basis of solvents made with use of polyamide pitches and products of polymerization are less eco-friendly and safe, however, thanks to high adhesion, they are capable to give a beautiful, glossy print and perfectly are suitable for the press on special, unabsorbed materials.

The most precise in terms of print quality are considered special inks for UV curing. They have no taste, or smell and therefore are considered as excellent option for use in the pharmaceutical and food industry.

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