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Re: Gravure printing processPosted By nicewatch  (26th Mar 20 at 4:12am)

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Gravure printing processPosted By zhangxiaosan  (21st Oct 19 at 4:15am)

Gravure printing is simpler and easier to master than lithography because of its high automation and good quality. The process flow is as follows:
Pre press preparation → printing → adjustment of rules → formal printing → post press processing
The preparation of intaglio printing includes: preparing substrate, ink, scraper, etc. according to the requirements of the construction sheet, and lubricating the printing machine.Custom Printing Logo Hair Packaging Paper Box For Bundle Wig Storage
Plastic film is the main substrate of gravure printing. Commonly used plastic films are polyethylene, polypropylene, PVC, etc. Because the surface of plastic film is smooth and the performance of adhesive ink is poor, the surface of film should be treated before printing. In general, corona treatment is adopted. The method is to pass the plastic film through two electrodes, force the air to be ionized by high frequency oscillation pulse to generate corona, and combine the free oxygen atom with oxygen molecule to generate ozone, so that some strong groups and invisible "burrs" are formed on the surface of the film, which improves the surface tension and roughness of the film and is good for oil. Adhesion of ink and adhesive.Wholesale Promotional 3D Lenticular Printing Business School Stimulate Paper Greeting Cards
Gravure printing, using solvent volatile ink, low viscosity, good liquidity, strong adhesion. The commonly used solvents are toluene, xylene, gasoline, alcohol, etc. before printing, add a proper amount of solvent to the ink for release, and it is better to use after filtering.
The main feature of gravure press is to use a scraper to scrape off the ink on the blank part of the plate. The doctor blade is a special steel sheet with a width of 60mm to 80mm and a length of 1000mm to 1500mm (depending on the size of the plate cylinder). The blade of the scraping blade must be in a straight line. If there is a small crescent like scar, there will be a wide slant bar on the printing sheet, that is, the phenomenon of empty bars will occur.
Printing plate is the basis of printing, which is directly related to the quality of printing. It needs to be rechecked before printing. Check whether the dot is neat and complete, and whether the chrome plated plate has the phenomenon of de chrome. The text plate shall be complete without any missing lines, and the pen shall not be broken. The plate can only be installed on the printer after detailed inspection.
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