rotogravure printing machine, Multicolour Rotogravure Printing line, BOPP Films Printing plant
Rotogravure Printing Machine
Rotogravure Printing Machine is used in flexible packaging manufacturing and printing process including polyester, Nylon, Bopp, Foil, low and high density polyethylene polypro plane and paper with two sided printing facilities with high speed hot air dryers. The high speed rotogravure printing machine has the great flexibilities and high resolution color combination at faster rate. The rotogravure printing machine is well designed for precision engineering for best industry standard requirements of valued clients with technical excellence, easy machine operations with good efficiency and performance, high durability and reliability with standard parts made from sturdy materials.
Rotogravure printing machine is designed to support flexible packaging film manufacturing industry. Rotogravure print plant is an expert supplementary solution that can be added to the existing flexible packaging film plant as it can print on variety of materials including paper, flexible films, aluminum foils, etc. Rotogravure printing line is a suitable choice to print on lamination lines made of different ingredients. Investing on this supplementary machine is a favorable opportunity to reduce the cost of secondary packaging requirements.
Gravure cylinders nowadays are typically engraved digitally by a diamond tipped or laser etching machine. On the gravure cylinder, the engraved image is composed of small recessed cells (or ‘dots’) that act as tiny wells. Their depth and size control the amount of ink that gets transferred to the substrate (paper or other material, such as plastic or foil) via a process of pressure, osmosis, and electrostatic pull. (A patented process called “Electrostatic Assist” is sometimes used to enhance ink transfer.)
A rotogravure printing press has one printing unit for each color, typically CMYK or cyan, magenta, yellow and key (printing terminology for black). The number of units vary depending on what colors are required to produce the final image. There are five basic components in each color unit: an engraved cylinder (whose circumference can change according to the layout of the job), an ink fountain, a doctor blade, an impression roller, and a dryer. While the press is in operation, the engraved cylinder is partially immersed in the ink fountain, filling the recessed cells. As the cylinder rotates, it draws ink out of the fountain with it. Acting as a squeegee, the doctor blade scrapes the cylinder before it makes contact with the paper, removing ink from the non-printing (non-recessed) areas. Next, the paper gets sandwiched between the impression roller and the gravure cylinder. This is where the ink gets transferred from the recessed cells to the paper. The purpose of the impression roller is to apply force, pressing the paper onto the gravure cylinder, ensuring even and maximum coverage of the ink. Then the paper goes through a dryer because it must be completely dry before going through the next color unit and absorbing another coat of ink.
Because gravure is capable of transferring more ink to the paper than other printing processes, gravure is noted for its remarkable density range (light to shadow) and hence is a process of choice for fine art and photography reproduction, though not typically as clean an image as that of sheet fed litho or web offset litho. Gravure is widely used for long-run magazine printing in excess of 1 million copies. Gravure’s major quality shortcoming is that all images, including type and “solids,” are actually printed as dots, and the screen pattern of these dots is readily visible to the naked eye. Examples of gravure work in the United States are typically long-run magazines, mail order catalogs, consumer packaging, and Sunday newspaper ad inserts.
Other application area of gravure printing is in the flexible packaging sector. A wide range of substrates such as Polyethylene, Polypropylene, Polyester, BOPP etc.. can be printed in the gravure press.