Rubber rollers are made with a metal core and an elastic rubber layer on the surface. It has certain elasticity, medium resistance, and wear resistance, which cannot be replaced by metal rollers. Currently, rubber rollers are commonly used in many industries such as papermaking, printing, dyeing, typing, harvesters, hulling rollers, cash registers, leather, and mining. However, some problems may inevitably arise during use, and the following will introduce them in detail.

一、Heat aging

Heating the rubber roller will accelerate desulfurization, cause thermal aging, make the surface sticky, soft, and even crack into orange lines. At this time, the rubber roller can only be replaced.

二、Colloid shedding

Ink dries early during the transfer process on the colloidal surface, and the dry ink film, due to its reduced ductility, will be damaged during the rolling process as the colloidal surface cracks, resulting in colloidal clumping. The main reason for early drying of ink is the addition of desiccants to the ink, printing ink with faster drying properties (such as POP ink used for aluminum foil), and not cleaning the ink rollers as required, resulting in ink drying on the rubber rollers during long-term use. During the roller processing, if the temperature is too high, the surface is prone to carbonization, and short-term printing may result in block shedding. Excessive printing pressure regulation, when the machine is idling, improper or untimely idle protection measures can also accelerate the damage to the surface of the roller body. The rubber roller that has fallen off can be replaced to solve the printing failure caused by this.

三、Surface glazing

During the printing process, the organic and inorganic substances in the connecting material of the ink, as well as the hydrophilic colloids in the plate lubricant, the detached fillers in the paper, and the coating will form a "bright film" on the surface of the ink roller, causing the surface of the ink roller to vitrify and the ink transfer performance to decrease.

四、Rubber roller expansion

In addition to being heated, the main reason is the use of improper cleaning agents, which causes the colloid to swell. The solution is to choose an appropriate cleaning agent (organic solvents that often cause swelling of the rubber roller: MEK methylacetaldehyde ketone, trichloroethylene, acetone, cyclohexane, banana water; non swelling organic solvents: alcohol, kerosene, light oil, roller cleaning agent).

五、Circumferential streaks

In addition to crystalline compounds that can cause similar circumferential streaks, the dried ink on hard ink rollers and garbage can scratch the surface of soft rubber rollers during operation, forming circumferential streaks. In this case, a dead ink remover must be used to remove the dried ink.

六、Ink stains on the water bucket roller

The surface of the chromium roller can fully isolate the ink after adsorbing the lubricating solution, but excessive lubricating solution and strong acidity of the lubricating solution will increase the emulsification of the ink. The emulsified ink will return to the water bucket roller along with the return water path. After the ink is adsorbed on the water bucket roller, it will cause poor lubrication and local water shortage. It is necessary to promptly remove ink from the water bucket roller and adjust the amount and composition of the fountain solution.