When printing on the ground, in addition to the ink skin, the ink roller fallout is also easy to stick to the ink layer.
main reason
Ink rollers have been used for a long time and wear out. In addition, due to the lack of attention to the maintenance of the ink roller, the product is not often scrubbed after printing, the surface of the ink roller is aging and smooth, and in the end, numerous cracks are generated. Irregular black hard blocks often fall off at the cracks, are adhered to the surface of the printing plate, and are transferred to the blanket, and finally reflected on the ink layer of the printed product. The falling objects of the ink roller are irregular triangles on the ink layer, with black dots in the middle, and white circles around the falling objects, which outline the shape of the falling objects.
Solution
There are two types of inking components: hard and soft ink rollers. Hard ink rollers are generally inking rollers, which are not easily damaged by metal; soft ink rollers are mainly made of nitrile rubber, which is easy to expand and deform, and the surface is dry. Conjunctiva or aging cracks, etc., affect the normal transmission of ink. In order to prevent the falling objects of the ink roller from affecting the quality of printed products, it is very important to strengthen daily maintenance and rational use.
â‘ The ink roller should be kept clean and clean. After a product is printed, the ink roller should be cleaned and wiped off on holidays, without leaving any ink dirt and debris to avoid film formation on the surface.
â‘¡ The aging of the ink roller is mainly caused by light and heat. The ink roller should not be placed in the sun, or near the heat or radiator, to prevent the surface aging phenomenon, or the ink roller sticky and softened. Ink rollers are placed on the wooden frame of the ink rollers when not in use, in a dry and cool place.
â‘¢Do not contact with non-volatile oil for a long time. Such as engine oil, ink adjustment oil, butter, etc. should not be in contact with the ink roller for a long time, otherwise the surface of the rubber roller will swell and deform and crack.
â‘£The ink roller should avoid the phenomenon of rotten glue and drossing caused by the etching with offset printing dampening fluid. Offset printing wetting fluid is a weakly acidic substance, containing surfactants, wetting agents, emulsifiers and other substances, do not fill the wetting fluid in the water bucket, otherwise it will overflow and spill on the ink roller, or after excessive moisture , The wetting fluid chemical erodes the ink roller.
⑤ The method of eliminating the falling off of the ink roller generally adopts manual and mechanical grinding to remove the conjunctiva layer and rotten glue layer. However, pay attention to the diameter of the ink roller, it should not be polished too much. If the ink roller is badly damaged and aged, it is better to replace the cracked rubber roller and use a new ink roller to ensure the quality of the printed product.
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