Advantages and disadvantages of lithography
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
Advantages and disadvantages of lithography
1 Advantages: The plate making work is simple and the cost is low. The color version is accurate and the printing plate is easy to copy. The print is soft and soft. Can print large numbers Volume printing.
2 Disadvantages: Due to the influence of water gel during printing, the tone reproduction power is reduced and the vividness is lacking. The layout ink is thin (only can show 70% ability, so Offset printed light box posters must be double-sided printed to enhance their color). Special printing applications are limited.
Application range
1 poster, 2 simple price, 3 manuals, 4 newspapers, 5 packs, 6 books, 7 magazines, 8 calendars, 9 other related color printing and large numbers The amount of printed matter.
Intaglio Printing
Basic principle of gravure printing
There is a lot of difference between the printed part and the non-printed part, which is the opposite of the letterpress, that is, the part of the printing plate has obvious concave shape on the layout. Below, the non-printed part is glossy and smooth. When printing, the ink needs to be rolled on the printing surface, and the ink naturally falls into the printed portion of the depression. After that, the ink adhered to the surface is wiped clean (of course, the depressed ink is not wiped off). After placing the paper, use a large pressure to put the concave The trapped ink is imprinted on the paper. Anyone who uses this printing method is called "gravure printing".
Gravure printing method
Because of the heavy printing pressure, the gravure printing method has more movements than the letterpress or lithography in the printing process, and the pressure on the layout is also Special attention must be paid to the printing method being the reverse pattern of the layout and the printing paper surface being the regular pattern.
Gravure printing is divided into engraved gravure and gravure
(Photogravure)
1 engraving gravure:
The engraving gravure was evolved from the early engraving of metal decoration. At that time, the engraved copper pattern was used as an ornament, and later it was used in the printing table. Now. The copperplate printing paper used for engraving gravure is wet first, mainly to increase the adhesion of the co-ink, so the back of the paper needs to be padded. Thick cloth, and with a large pressure, can draw the ink stuck in the printed mark on the paper and print it on the paper. This printing method is mainly lacking. The point is that it needs to be dried after printing, which will produce irregular stretching and contraction, which will cause the printed products to have uneven length. But now the copperplate printing has been improved. For dry printing, the layout is improved and the lines of the engraved depressions are made shallower. Make the ink it sticks easy to pull out. According to copperplate printing and steel plate Printing for the depth of the pattern, the thickness of the lines and the depth of the three-dimensional sense, the thick and deep printing plates, the adhesion of the ink Thick, so the ink color is darker. The fine and shallow lines of the printed paper are thinner, so the printed ink is lighter. Such print It's as beautiful as the modern visual art design, but most of it is used to express patterns or text, as for a continuous color like a photo. (Continuous-tone) is harder to do.
2 gravure
Photogravure is also called photocopying, which is to use the principle of photography to corrode the copper plate. It is a kind of adhesive paper which has been treated by potassium dichromate solution.(Larbo Tissue) and the gravure-specific screen version of the screen exposure, and then the adhesive tape and the continuous version of the sun plate, the adhesive tape After two exposures, it can be developed by warm water. The adhesive paper on the light part of the picture is lighter than the black silver on the positive piece, and the adhesive tape is transmitted by the light wave. The degree of hardening is higher, so the film after water development is thicker, and the adhesive tape in the dark part of the picture is affected by the thicker black silver of the positive film. The adhesive tape can be hardened by the transmission of light waves, so the film after water development is thinner. Therefore, this developed and thick and different glue The paper is attached to a copper roller or a flat roller. It is corroded with ferric chloride. The thicker part of the film is able to penetrate and erode the depth of the copper plate. The degree of lightness is shallower, so the ink film that is adhered to it is thinner, and the ink color printed on it is lighter. As for the dark film of the dark part, the thickness of the film can be dissolved. The etched copper plate must be deeper, so the ink film adhered to the print is thicker, and the ink color printed on it is deeper.
Advantages and disadvantages of gravure printing
1 Advantages: The ink has a performance of about 90% and is rich in color. The color reproduction is strong. The layout is strong. The number of prints is huge. Application paper range A wide range of materials other than paper can be printed.
2 Inferior points: plate making costs are expensive, printing costs are expensive, plate making work is more complicated, and a small number of printed items are not suitable.
Gravure application range
Engraving gravure printing, because its lines are exquisite and not easy to counterfeit, it is used in the printing of securities, such as banknotes, stocks, gift certificates., stamps and commercial credits or stationery, etc. Due to its high cost, such as plate making, general prints are rarely used.
As for the gravure, although the plate making process is complicated and the cost is relatively expensive, it is not suitable for printing a small number of printed materials.