Introduction of gravure printing technology and gravure printing machinery
Gravure printing technology is a direct printing method. There are many requirements for materials, and gravure printing technology has been developed. The gravure printing machine is indispensable for the use of gravure printing machinery. The gravure printing machine mainly realizes the printing of printing materials.
See the printing machine for details:
1BOPP is the most commonly used gravure printing substrate. The main point of the production process is a typical plastic gravure production process: printing with polyamide or chlorinated polypropylene ink, appropriate tension and embossing force. The drying temperature is controlled at 80%.
2BOPET printing points: Because PET is usually thin, easy to wrinkle, requires a large tension during printing, has a certain selectivity to the ink, easy to separate layers with general printing ink, prone to blockage, fluffing and scraping marks, when printing It is good to have a large humidity in the workshop.
3BOPA printing points: BOPA is a film that is easy to absorb moisture. Therefore, the printing machine must ensure that the ambient humidity of the printing machine cannot be too high; the unprinted film can not destroy the original aluminum film packaging film, and should be printed immediately after opening. The nylon film should be preheated at the preheating temperature of 50-80. °C; printing tension should be properly reduced; pressure should be moderate; ink adaptability, depending on the choice of product structure, if it is a cooking bag must choose cooking ink, the printed product must be sealed and assembled as soon as possible.
4K coating layer printing points: K-coated film, whether it is roll-coated or spray-coated, its thickness uniformity is not very good, the surface is not flat, and PVDC is just brittle, printing tension and embossing pressure can not be too large during printing The printing is difficult, the ink transferability is poor, and the printing is easy when the shallow web is printed, and the printing roller with higher hardness is required. In addition, it is selective for the solvent. If the solvent is used improperly, the coating may be dissolved, the solvent of the printing film is large, and it is easy to stick, so special attention should be paid to drying and cooling.
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