1. The pressure between the rubber rollers is too heavy. The pressure between the rubber rollers is heavy, which will increase the friction between the rubber rollers, make the rubber rollers heat up, increase the extrusion and expansion between the rubber rollers, and accelerate the aging and aging of the rubber rollers. Deformation speeds up the emulsification process of ink and water, which is not conducive to the transfer of ink. The solution is: the pressure between the rubber rollers should be basically the same as the pressure in contact with the layout. The experience is to use a 1500-filament, 3cm-wide plug to insert between the test rubber rollers, and you can feel a certain amount of tightness. After scrubbing, wipe it again with a clean cloth and install the rubber roller on the machine for the next use. picture 2. Surface crystallization treatment of rubber roller Surface crystallization closes capillary pores on the surface of the rubber roller, which will cause the rubber roller to lose its ink-friendly effect, resulting in uniform ink transfer distribution and prone to ink emulsification. The solution is: remove the rubber roller on the machine, put it flat on a shelf, stick kerosene and pumice powder with a cloth, wipe the surface of the rubber roller evenly with force, wipe off the crystallized layer on the surface of the rubber roller, and show the original Clean the rubber color of the rubber roller, then use car wash water or gasoline to clean the kerosene and pumice powder remaining on the rubber roller, reinstall and adjust the pressure of the rubber roller. 3. Maintenance of the bearings on the rubber rollers During the high-speed operation of the machine, the wear of the bearings on the rubber rollers is obvious, especially when the operator usually pays attention to the maintenance cloth of the bearings, the wear will be even worse. After the bearing of the rubber roller is damaged to a certain extent, it will cause jumping friction and extrusion of the rubber roller, which will shorten the service life of the rubber roller. And it will cause the printed products to have the phenomenon of “ink and water bars”. Therefore, the operator is required to take down the rubber rollers every week, apply butter to the bearings, and replace those bearings that are severely worn and have poor rotation, so as to ensure the normal use of the rubber rollers. 4. The influence of stacking rubber rollers in the workshop environment In the hot and humid weather and the production in the surrounding dusty environment, the high-speed operation of the machine makes the surface temperature of the rubber rollers continue to rise, and the rubber rollers are heating and expanding, increasing the rubber The friction of the roller will shorten the service life of the rubber roller. Therefore, in qualified factories, offset printing requires the installation of air conditioners to keep the workshop tidy and clean, so that the machine can operate in a good environment. Only in a good workshop environment can high-quality products be produced. ① Neoprene: suitable for making various soft printing rubber rollers, gravure printing rubber rollers, etc. Cots can be formed by molding, film wrapping, winding or extrusion. Due to the poor storage stability of the rubber compound, care should be taken to avoid parking in direct sunlight during the manufacturing process. At the same time, it is necessary to control the temperature conditions where the rubber is parked. ② Nitrile rubber: used in the manufacture of printing rubber rollers, food industry rubber rollers, textile printing and dyeing rubber rollers, soft rubber rollers exposed to solvents, etc. Nitrile rubber has poor ozone resistance, so it should avoid operating in an environment with high ozone concentration during processing. Nitrile rubber and polyvinyl chloride can be used together to obtain a rubber compound with good ozone resistance and weather resistance. ③ Polyurethane rubber: It has outstanding tensile strength, abrasion resistance and crack resistance, and polyester polyurethane rubber has good resistance to various solvents. In addition, continuous exposure of compounds to high temperatures and humidity can adversely affect performance. For polyurethane rubber rollers under high speed and high pressure, the key point is to improve the dynamic off-roll problem and crack phenomenon. ④ Silicone rubber: heat resistance up to 200-250 degrees, good resistance to chemical erosion, the main disadvantage is low tensile strength. Typical uses of silicone rubber rollers are fabric heat setting, plastic heat setting embossing, calendering, copier fixing, etc. The molded silicone rubber roller is molded by film wrapping. Due to its low strength, it must be handled carefully. ⑤ Chlorosulfonated polyethylene; with high toughness and elasticity. Wear resistance, heat resistance up to 150 degrees, good resistance to various chemicals and oils, and excellent insulation. It can be manufactured by various methods other than the casting method, and the rubber should be protected from sunlight during the production process. ⑥ Ethylene-propylene rubber: It can be used under high temperature conditions of 150 degrees. It has excellent chemical resistance and polar solvent resistance, but it is not resistant to hydrocarbon solvents and oils. It can be used to make extrusion rubber rollers, conveying rubber rollers, and contact rollers. Printing rollers for inks containing acetone and ester solvents. Roll forming and extrusion forming can be used for roll making, and care should be taken to avoid contact with oil and hydrocarbon solvents during the process operation.  

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