There are two kinds of structure of on-line glazing of the printing machine, one is that the glazing unit and the mechanism of the printing machine are the same, use the fountain solution system to apply the coating with roller coating; the second is the use of anilox roller and scraper structure, The thickness of the coating coating is controlled by anilox rollers and doctor blades. Multi-color printing presses that cooperate with two coating units are usually coated with roller coating and then coated with an anilox roller.
The use of printing machines for on-line glazing has the advantages of high speed, high production efficiency and low production cost, which can reduce the intermediate production links and the loss of printed products, and can better improve the quality of products and increase economic efficiency. The use of printing machine on-line coating can not only polish the entire print, but also polish the local layout of the print.
The on-line coating unit can be produced with both on-line offset production and gravure and flexo printing machines for instant printing and glazing. However, the aircraft equipment investment is relatively high, suitable for large and medium-sized factories for high-end, bulk product printing and polishing.
1) Structure and characteristics of ordinary polishing equipment
The processing object of the ordinary polishing machine is the print of flatbed paper, and its main structure consists of a feeding plate (or paper feeding structure), a transmission structure, an electrical control device, a coating structure, a conveyor belt, a drying device, an exhaust device, and a delivery paper. Devices and so on. Due to the different characteristics of the coating material, the ordinary coating machine has a thick paper type (also known as a special type) polishing machine and a general-purpose type coating machine that can adapt to a thick and thin paper. Thick paper machine mostly semi-automatic structure, generally suitable for the ration of 200g/m2 above the amount of printed sheets. General-purpose polishing machine is generally a fully automatic structure, and has good adaptability to the coating of thick and thin sheets. The drying mode of the special glazing machine has two structures: solid conduction heating and radiation heating and drying.
2) Structure and characteristics of printing machine polishing
The use of lithographic, letterpress (including flexo, stickers) printer can also be partial or full-width glazing, the glazing is the use of ink and rubber rollers to transfer gloss oil, with PS version (plano) and blanket; The surface of the printed sheet is coated with a copper, zinc plate, rubber plate, or resin plate, and the pressure of the platen or plate is used to transfer the varnish of the blanket or plate surface onto the printed sheet. Due to the slow drying speed of the printing machine, the coating thickness of the coating has certain limitations. The gloss of the coating on the printed product is not as good as the coating effect of the special coating machine. It is generally suitable for ordinary prints with low quality requirements. The glazing.
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