In the printing and packaging industry, cots uniformly transfer certain ink and water to the printing plate in the process of printing, and the mesh points will inevitably be blocked by ink skin, paint or paper wool or other dirt. After 2-3 months of use, ink rollers will appear successively, including calcium water, dirty, dry water, ink accumulation, stopping and pocking points, which seriously affect the transfer performance of ink road and water, it must be cleaned in time. Long-term not cleaning, resulting in product color unsaturated, efficiency is not good, can not normal production, waste of expensive time and cots command rate, cause serious blockage can not be used normally and even make expensive roller and ink roll scrap. (Note: If the cots are cleaned once every 3 months, they can be used for 2 years, because the cots will harden to 40 degrees after 3 months, and the normal is 30-35 degrees).