Maintenance of rubber rollers

Lubrication of rubber rollers

The shaft head and bearing of the rubber roller should be regularly and effectively lubricated. If the lubrication is poor, it will cause the wear of the roller head and the bearing, and the gap will increase, resulting in uneven printing ink. At the same time, it will also cause printing bar marks due to the jumping and sliding of the rubber roller. If there is no effective lubrication in continuous operation for a long time, it will also cause heat generation in the bearing and the shaft core, which will cause the rubber surfaces at both ends of the rubber roller to be thermally expanded and worn, resulting in pockmarks, glue loss and cracks on the rubber surfaces at both ends.

Points for attention in the use of rubber rollers

Before printing, check whether there is foreign matter between the rollers, whether the rubber roller is intact, whether the pressure between the rollers is uniform, and the radial contact pressure of the rubber roller must be uniform. Otherwise, the long-term operation of the quenching roller will cause the cots on the side with higher pressure to produce pockmarks, glue drop, cracks, and glue opening. Printing can only be done after it is confirmed that it is normal and cleaned.

The rubber roller should always maintain a good contact state during operation. Regardless of the width of the printed product, the entire rubber surface of the rubber roller must be lubricated with ink; depending on the amount of ink accumulated between the rubber rollers, the amount of ink should be adjusted in time to ensure printing quality. Under the premise of ensuring the printing speed, in order to prevent the ink from drying too fast, the viscosity of the rubber roller is reduced, and the surface is crusted, the amount of drying oil should be controlled for the ink that needs to be added with drying oil to prevent the rubber roller in operation. Ink and ink transfer uneven phenomenon.

Cleaning of rubber rollers

Before and after printing, the rubber roller must be cleaned with a special cleaning agent to remove impurities such as ink skin and ink residue, so as to keep the surface of the rubber roller smooth and clean. If it is not cleaned in time, the ink will adhere to the micropores through the fluffy micropores on the surface of the rubber roller, and paper wool and dirt will adhere to the surface of the rubber roller. If the parking time is too long, the ink conjunctiva will cause the contact surface of the two rollers to stick together, dry to form a hard ink block, and then the rolling of the hard ink block will tear the rubber surface, resulting in pitting and slag, and the rubber roller will be scrapped. If the cleaning is not in place, glaze will occur, resulting in reduced ink affinity, ink transfer, and even deinking. Glazing increases the surface hardness and reduces the elasticity of the rubber roller, and at the same time accelerates the wear of the rubber roller, resulting in pitting and cracking on the rubber surface, resulting in slag loss and affecting the printing quality.

The rubber roller should be carefully cleaned after the production operation is completed every day, and the cleaning should be repeated twice. It is worthy of special attention that the cleaning of printing rubber rollers must use specified chemical agents, such as industrial alcohol, etc., and quenching rollers must not use corrosive solvents; UV ink rubber rollers use special UV ink cleaning agents, and alcohol dampening rollers use alcohol to moisten. Special cleaning agent for plate rollers. It is best to take off the rubber roller when taking a break during holidays to prevent deformation under pressure. For the protection of the surface of the printing rubber roller, the textured chrome plating should be wrapped in newsprint and placed in a ventilated and dark place.