How to maintain and maintain the printing roller?

2. Lubrication roller heads and bearings should always maintain effective lubrication. If the lubrication is poor, it will cause the rubber roller head, bearing wear, gap increases, resulting in uneven printing ink. At the same time, the print marks can also be caused due to defects such as bouncing and sliding of the rubber roller. If there is no effective lubrication for a long period of continuous operation, it will cause the bearing and the shaft core to generate heat, causing the rubber surfaces of the two rubber rollers to expand and wear due to thermal expansion, so as to make the two rubber surfaces produce pockmarks, glue drop and cracks.

3, adjust the pressure between the rubber roller and the rubber roller and the plate should be adjusted according to the elasticity of rubber, hardness and its role in the printing process, generally use O.15 ~ O.20mm feeler gauge (feeler to lubricate In order to avoid damage to the rubber surface), the radial contact pressure of the rubber roller must be uniform. Otherwise, long-term operation will cause the pressure of the rubber roller at one end to produce numbness, glue drop, cracking, and open glue.

★ Use and maintenance

1. Before printing, check whether there is foreign matter between the roller and the roller, whether the rubber roller is intact, whether the roller pressure is even and consistent, confirm the normal, clean and clean before printing.

2. During the printing, the rubber roller should always maintain a good contact state and the force is uniform. Regardless of the width of the printed product, the entire rubber surface of the rubber roller should be lubricated with ink. The amount of ink accumulated between the rubber rollers should be adjusted in time to ensure the printing quality. Under the premise of guaranteeing the printing speed, in order to prevent the ink from drying too quickly, the cohesiveness of the rubber roll will be reduced, and the surface will have a skinning phenomenon. The amount of dry oil should be controlled for the ink that needs to be added with dry oil to prevent the running roller from being produced. Do not ink and spread ink inequality phenomenon.

3. After the printing, the rollers, rollers and rollers should be disengaged from the plate in time to remove the load pressure and prevent the plastic surface from being deformed due to static pressure. It is necessary to clean the residual ink on the surface of the rubber roller in time to prevent it from drying and producing ink sticks, ink film, ink stains and dirt floating on the plastic surface. (Especially the ink sticks on both ends of the nylon roller) will grind and damage the rubber surface finish when it is running again. Seriously, it will produce pockmarked dregs.

4. The rubber roller cleaning rubber roller must be cleaned with a special cleaning agent before and after printing to keep the surface of the roller clean and ready for use. If the cleaning is not timely, the ink will adhere to the micropores through the villous micropores on the surface of the rubber roller, and the paper wool and the dirt will adhere to the surface of the roller. If the parking time is too long, the ink conjunctiva will cause the contact surface of the two rollers to stick together. When the car is driven, it will tear the rubber surface and cause the rubber roller to be scrapped. If the cleaning is not in place, glazed phenomenon will occur, which will lead to the decrease of ink-receptivity and ink-transferability and even cause deinking. The glaze makes the surface hardness of the rubber roller increase and the elasticity decreases. At the same time, the abrasion of the rubber roller is accelerated, resulting in the occurrence of pitting and cracking of the rubber surface, resulting in drossing and affecting the printing quality.