The glazing machine is an important equipment for surface finishing processing of products such as cartons, cartons, books and periodicals, etc. It plays a very important role in improving the surface performance of printed products, improving the wear resistance, stain resistance and water resistance of printed products. The role. For printing and packaging enterprises, choosing a glazing machine with excellent structure, stable performance, convenient operation, high production efficiency, wide applicability, and better energy saving is very important for scientific and reasonable organization of production. Therefore, to correctly understand and understand the structure and characteristics of the glazing equipment, and to master the procurement control of the glazing machine, is an important part of improving production efficiency and product quality. 1. Type of glazing machine The glazing machine is divided into three types: printing machine online glazing unit, special glazing machine and printing machine glazing. Among them, the multi-color printing machine on-line glazing unit has a 4-color, 5-color, 6-color plus 1-color or 2-color glazing unit, which can be used for water-based or local UV glazing, and can be used for oil type and solvent. Type of glazing; both high-brightness paint and matte paint can be applied. Single machine glazing machine has simple structure, convenient operation, and low equipment investment. It is a commonly used glazing equipment for packaging and printing. The product has wide adaptability and is suitable for large, medium, and small printing and packaging factories. The special glazing machine is divided into two types: manual renewal and automatic paper feeding. Some of the equipment can be used for glazing in a whole frame or partially. According to the actual production status of the factory, a reasonable choice should be made to improve production efficiency. In addition, the printing machine can also be used for partial or full-scale glazing. The principle is to use the printing plate to receive varnish or varnish, and then transfer the varnish or varnish to the surface of the printed product through mechanical imprinting. 2. Structure and characteristics of glaze coating The glazing structure is divided into an anilox roller blade structure, a three-roller direct coating structure, a doctor roller coating structure, a dip-type reverse coating structure, a cavity blade structure, a drag blade coating structure, and an air knife coating structure And a variety of blade coating structures. Due to the different structure of the machine, its production efficiency and glazing quality effects are also different. 1) Anilox roller scraper structure The conveying form of the anilox roller scraper structure is exactly like a flexo printing machine, and its structure has two-roller type, three-roller type and four-roller type. Among them, the three-roller coating is to add a rubber coating roller between the anilox roller and the liner roller. The viscosity of the glazing coating is required to be appropriately lower, which is conducive to uniform coating, so it is better than the two-roller coating. The coating quality of the machine is good. In addition, the four-roller machine has great adaptability to paint viscosity and fluidity, and the glazing coating is more uniform and of good quality. Because the anilox roller transfers the glazing paint by regular mesh holes, the amount of paint transfer is almost constant, and the glazing paint obtained on the surface of the printed product is relatively uniform and stable. However, to change the thickness of the glaze coating, anilox rolls of different specifications should be replaced. 2) Three-roller direct coating structure The structure is composed of metering roller, discharge tube, coating roller, doctor blade and liner roller, etc. The coating amount of the printed product is determined by the gap between the metering roller and the coating roller, and the adjustment is more convenient. The three-roller coating has a simple structure and can be coated on both sides. For double-sided coating, the material is fed from the lower fabric tank and the upper conveying device at the same time for glazing. This structure machine has high production efficiency and low printed sheet consumption, and is a commonly used glazing coating method. 3) Scraper coating structure The direction of the coating roller of the doctor roller coating structure can be the same as or opposite to the direction of sheet feeding, and the speed can also be adjusted to meet the requirements of glazing coating. Squeegee coating is the simplest glazing method. It applies excess paint to the paper surface during glazing, and then the squeegee roller scrapes off the excess paint to keep the paper surface glazed. Coating, while obtaining a uniform coating quality effect. 4) Immersion reverse coating structure This machine is generally composed of storage tank, feeding roller, leveling roller, coating roller and liner roller. The gap between the rollers coated by the reverse roller of this type of machine has a great influence on the quality of the glazing coating, and the gap size can be adjusted flexibly and conveniently. In addition, the automatic circulation of the coating on the machine can help to ensure the coating quality of the printed products. 5) Cavity scraper structure In this structure, the varnish is measured by an anilox roller. Two scrapers form a closed cavity for the anilox roller. And because the structure has a short circulation oil path, the varnish can reduce volatilization better. The glazing quality of this structure The effect is good, and it is relatively easy to clean. It is a more advanced glazing structure. 6) Drag knife coating structure When the structure is glazed, the printed sheet is closely attached to the surface of the rubber layer of the backing roller. When the backing roller rotates through the glazing chute, a uniform coating is obtained on the surface of the printed sheet under the action of the blade edge of the drag blade. The drag coating structure can also be used for double-sided coating, and is more suitable for high-speed glazing. The concentration of the coating is high, the coating is smooth, and the glazing quality is better. 7) Air knife coating structure It is coated by the coating roller on the surface of the printed sheet. When the printed sheet passes between the backing roller and the air knife, the air knife slit jets an airflow at a certain angle to the printed sheet surface, which will excessively varnish the printed sheet surface. Blow into the recovery tank to make the surface of the printed sheet evenly coated. The coating amount of the air knife glazing depends on its position with the printed sheet, the paper feed speed and the viscosity of the glazing coating. The glazing oil applied by the coating roller to the paper surface should be kept to a minimum to be suitable, and a better glazing effect can be obtained. The air knife glazing coating can obtain a smooth coating corresponding to the uneven base paper, and has good adaptability to the base paper gloss, varnish concentration and viscosity. However, if a solvent-based varnish is used for varnishing, the organic solvent in the paint is likely to pollute the production environment and increase the loss of varnish due to the air flow on the air knife, so this structure is only suitable for the use of water-soluble Glazing paint. 8) Scraper coating structure Squeegee coating is to use scraper to scrape off the excess paint on the surface of the printed sheet (after coating through the trough), so as to form a uniform and appropriate coating on the paper surface. This coating structure has poor control of the coating amount, and the coating is prone to streak defects, and is generally only suitable for low-speed glazing production. Focusing on the development, design, production and sales of modern simple style and compact design furniture for more than 30 years, Lihua is going to provide you a variety of Entryway Furniture, including Hall Tree, Storage Bench, etc, with superior quality and durability. Entryway Furniture,Storage Bench,Entryway Bench,Hall Tree Jiangmen Lihua Import & Export Trading Co., Ltd. Jiangmen Lihua Furniture., Ltd. , https://www.jmlihua.com
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