Commercial Furniture,Commercial Office Furniture,Commercial Desk,Commercial Lounge Furniture NINGBO CHEN WEI SUPPLY CHAIN MANAGEMENT CO.,LTD , https://www.nbchenweifurniture.com
1. Water supply part: It consists of a water bucket, a water fountain roller, and a water transfer roller. The main function of this part is to supply the water to the portion of the water that is quantified and timed.
2. The uniform part: It consists of a series of water rollers and a uniform roller. It rotates and axially circulates through the tandem roll and evenly transfers the moisture to the water roller. At the same time, due to the presence of surface active substances in the water bucket solution, the surface tension of the water can be reduced, so that the fountain solution can be evenly distributed on the water-impregnated roller covered with the flannel cloth.
3. The water part: It consists of a number of water rollers. The main role is to apply evenly and evenly the water in the blank part of the offset printing plate. In the water delivery mechanism of the offset press, the bucket series and the skewer roll are all chrome-plated materials. This is because metal chromium is the most hydrophilic, and the string water roller and the fountain roller are all chrome-plated.
Offset printing is a unique printing method using water. Because of the need for water, it is necessary for the water distribution agency to regularly and evenly supply water to the blank part of the printing plate. Then on the ink, that is, "before the water after the ink." Control the surface water quantity of the printing plate, use the least amount of water on the premise of not dirtying the plate, reach the balance of the offset printing ink, reduce the ink emulsification phenomenon, this is the premise that raises the offset printing quality.
1) The water fleece or water fleece sleeve used on the water roller is degreased and has good hydrophilic properties. The water fleece sleeve has countless pores and its adsorption is particularly strong, which ensures the hydrophilicity and water absorption of the water roller, and can play a good wetting effect on the printing plate.
2) The pressure of the water roller and the printing plate has a great influence on the print quality and the printing rate of the printing plate. The pressure is too high, the printing plate has a low printing rate, and wear quickly. The graphic part will produce a "flower pattern" phenomenon. At the same time, it will easily cause the water roller to beat to produce a "water roller white bar." However, if the pressure of the water roller and the printing plate is too light, the printing plate will not get normal water supply, which will cause the printing plate to be dirty.
When adjusting, first adjust the pressure between the water roll and the string water roll, and then adjust the pressure of the water roll and the printing plate. These two adjustments do not affect each other. In addition, adjust the water roller to ensure that the pressure at both ends of the same size. When the contact pressure of the water roller and the string water roller is too light, the amount of water obtained by the water roller from the string water roller is reduced, resulting in a dirty plate phenomenon.
4. In order to increase the utilization rate of the water roller and reduce the consumption of raw materials, it is necessary to keep the water roller clean and free of oil. In the printing process, the water roller is in contact with the surface of the printing plate, and the offset printing uses water to determine that the ink will be emulsified. A small amount of the emulsified ink is transferred to the bucket slot through the water roller, the water transfer roller and the string water roller. Therefore, the water roller cover of the water roller must be kept clean and free of oil. The surface of the fleece jacket is first exposed to oil stains, resulting in lipophilicity, which reduces hydrophilicity, and thus affects water delivery performance.
In order to ensure that the water roller is fully wetted and encounters prolonged shutdowns and holiday breaks, the water roller should draw enough water to prevent the glue on the surface of the roller and the ink from drying out, resulting in uneven water transfer. Before the offset press is turned on, the water roller accumulates enough water to contact the plate before it can reduce the possibility of dirt on the roller.
When a rest day or a light color ink is changed from a deep color ink, the water roller must be cleaned. The cleaning method is: put the water roller into the water tank, first use the gasoline to cast the water roller, and evenly brush with a large brush. The ink on the fleece is completely dissolved by the gasoline, and then rinsed with clean water, flushing the brush, if still not clean enough steel can be scraped along the direction of the water fleece sleeve several times, if the water fleece sets Dirty, can replace the new water jacket. In addition, the wetting solution in the bucket will have a large amount of sediment and dirt for a long time. This is mainly due to the fact that the water roller transfers the paper dust, ink, and ink from the printing plate over the past, and this must be cleaned in time. Keep the buckets clean.
Offset water delivery system
Editor's note: China's printing industry has introduced a large number of advanced printing presses. These printers all have the features of high automation, fast printing speed, and good product quality. However, as the service life increases, the wear and damage of the equipment also increases. In addition to natural wear, some parts are accelerated wear and damage due to the poor operating conditions of the equipment. If the normal maintenance and maintenance of the printing press cannot be performed normally, the technical performance of the equipment will be reduced, thereby reducing the printing quality. Improve the integrity of the equipment, ensure that the printing quality does not decline, production is carried out smoothly, and reduce the losses caused by improper maintenance. These further indicate that the offset printing and water transfer mechanism is composed of a water supply part, a uniform part, and a water part.