Monday, 4 October 2010

Gravure


Gravure

Gravure is a type of the intaglio printing process that involves engraving the image onto an image carrier. Gravure printing presses two large print reels of paper together rather than sheets of paper. This type of printing is the fastest and widest printing press in operation.
It is capable of transferring more ink to the paper than other printing processes, and is also noted for its remarkable density range.
A gravure printing press has one designated printing unit for each color, commonly CMYK. While the press is in operation, the engraved cylinder is partially immersed into 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,
by pressing the paper onto the gravure cylinder, ensuring maximum coverage of 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.

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