A, the pressure between the rubber rollers is too heavy pressure between the rubber rollers will increase the friction between the rubber rollers, make the rubber rollers warm up and heat up, aggravate the squeezing expansion between the rubber rollers, accelerate the aging and deformation of the rubber rollers, accelerate 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 of the contact layout. Experience is to use a 1500 silk, 3cm wide plug piece insert test between the rubber rollers, can feel a certain tight force on the line. After scrubbing, wipe again with a clean cloth and then put the rollers on the machine for the next use. Second, the surface of the rubber roller crystallization treatment surface crystallization closed the surface of the rubber roller capillary pores, will make the rubber roller lose the role of pro-ink, resulting in the transfer of ink cloth evenly, easy to emulsification of ink. The solution is: remove the rubber roller from the machine, put it on the shelf, take the cloth ball sticky kerosene and pumice powder, rub the surface of the rubber roller evenly, wipe off the surface crystallization layer of the rubber roller, show the original rubber color of the rubber roller, then use the car wash water or gasoline to clean the kerosene and pumice powder left on the rubber roller, reinstall and adjust the pressure of the rubber roller. Third, the maintenance of the bearings on the rubber roller in the high-speed operation of the machine, rubber roller bearing wear is very obvious, especially the operator usually pile of bearing maintenance cloth attention, that wear is more powerful. After the bearings of the rubber roller are damaged to a certain extent, it will produce the jumping friction and extrusion of the rubber roller, shortening the service life of the rubber roller. And will make to print out the product has “ink, water bar” phenomenon. So the operator is required to take down the rubber rollers every week, grease the bearings and replace those bearings which are worn out and rotate badly to ensure the normal use of the rubber rollers. Fourth, the impact of the workshop environment heap rubber rollers in the hot and humid weather and from the surrounding dusty environment production, the high-speed operation of the machine to the surface temperature of the rubber rollers rising, rubber rollers in the heat expansion, increase the rubber roller friction, which will make the life of the rubber roller shortened. So in the condition of the factory, offset printing plug-in requirements to install air conditioning, keep the workshop neat, clean, so that the machine in a good environment production operation, only in a good workshop environment production, will produce high-quality products to. ① Neoprene: It is suitable for making various soft printing rollers, photographic gravure printing rollers, etc. Roll forming can be molded, film wrapped roll forming, winding forming or press out forming methods. Because the storage stability of rubber is poor, so in the manufacturing process, attention should be paid to avoid parking in direct sunlight. At the same time to control the temperature conditions of rubber storage. ② Nitrile rubber: used in the manufacture of printing rollers, food industry rollers, textile printing and dyeing rollers, soft rubber rollers in contact with solvents, etc. The ozone resistance of NBR is poor, so the processing should avoid operating in an environment with high ozone concentration. Nitrile rubber can be used with PVC to obtain rubber with better ozone resistance and weather resistance. ③ Polyurethane rubber: With outstanding tensile strength, abrasion resistance and anti-cracking properties, polyester-type polyurethane rubber has good resistance to a variety of solvents. In addition, the rubber is continuously exposed to high temperatures and humidity, which can adversely affect performance. For polyurethane rubber rollers used at high speed and high pressure, the focus should be on improving the dynamic de-rolling problem and cracking phenomenon. ④ Silicone rubber: heat resistance up to 200-250 degrees, chemical resistance is very good, the main disadvantage is the low tensile strength. Typical uses of silicone rubber rollers are heat setting of fabric, heat setting embossing and calendering of plastic, fixing of copying machine, etc. Formed silicone rubber rolls are formed by film wrapping, and must be handled with care due to the low strength. ⑤ Chlorosulfonated polyethylene; with high toughness and elasticity. It is resistant to abrasion, heat resistance up to 150 degrees, good resistance to various chemicals and oils, and has excellent insulation properties. It can be manufactured by various methods other than casting method, and the rubber should avoid sunlight during the production process. (6) Ethylene propylene rubber: It can be used at 150 degrees, has excellent chemical resistance and is resistant to polar solvents, but is not resistant to hydrocarbon solvents and oils can be used to make extrusion rollers, conveying rollers, printing rollers that contact ink containing acetone and ester solvents. Roll making can be wrapped and rolled into shape and pressed out into shape, and attention is paid to avoid contact with oil and hydrocarbon solvents in process operation.

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