Use of rubber roller
During normal operation, proper pressure and good contact between the rubber rollers should be maintained to ensure the performance of the rubber rollers.
(1) When the rubber roller is installed on the machine, the proper tightness between the roller neck and the bearing should be ensured to avoid sliding or jumping caused by looseness during operation; when disassembling the rubber roller, gently handle it, do not hit the roller neck and The rubber layer is to avoid scratching, bending deformation and damage of the rubber layer. In order to save costs, some customers often require their own bearings. In fact, some models have some small accessories (such as gaskets) between the roller head and the bearing. The function of these accessories is to maintain the dynamic balance of the rubber roller. The rubber roller is better able to express its balanced quality.
(2) The roller neck and bearing of the rubber roller should be kept lubricated at all times, otherwise it will cause the rubber roller shaft to wear and appear gap, which will cause the rubber roller to jump or sway, resulting in uneven printing ink color and causing printing indentation. Long-term non-lubrication will also cause the core to heat up rapidly, causing the rubber to expand due to thermal expansion, which will affect the printing pressure. In addition, the bearings are not reusable, and the removal of the bearings often results in damage to the oil seal and prevents the bearings from slipping smoothly. The outer ring of the bearing is cast iron (harder), the iron core shaft is pig iron (softer), and the bearing will cut the iron core shaft and the wear bearing seat at high speed to cause printing failure.
(3) Correctly adjust the pressure between the roller and the roller, the roller and the plate. We recommend that customers use a special indentation test strip because the pressure of the rubber roller is not proportional to the width of the indentation. After testing, increasing the indentation width by 50% requires an increase of 250% of the pressure; and increasing the indentation width by 100% requires an increase of 725%. If the width of the indentation is too wide, the core shafts at both ends will be subjected to excessive weight, and more power is required to operate the printing press. The rubber roller will be excessively heated, and the adjustment of the ink balance will be more difficult.
When installing a new rubber roller, the spacing must be relaxed because the new rubber roller may be thicker than the old rubber roller. The rubber roller needs to be adjusted up and down and left and right until the entire surface is evenly contacted.
Adjusting the pressure of the rubber roller generally uses 0.15 ~ 0.20mm ink ruler, measuring the pressure of multiple points in the radial direction of the rubber roller to make it uniform, and can also be easily tested with high-strength paper strip. Some models of alcohol water roller because it is differential, its line speed is not the same as the plate roller, this time pay more attention to the pressure adjustment.
Rubber roller cleaning
The roller cleaning products used by current printing manufacturers are roughly divided into two types, one is a conventional cleaning agent, and the other is a new ink cleaning agent.
(1) Traditional cleaning agent
It is generally composed of aliphatic and aromatic hydrocarbons. The cleaning agent has a good cleaning effect on the rubber roller and can dissolve the ink, but the polar material on the ink roller, such as paper powder, paper wool, etc., cannot be thoroughly cleaned. Long-term use will reduce the life of the press, corrode the gel, cause the expansion of the rubber polymer, causing the rubber roll to expand or contract, thus affecting the printing pressure and the transfer of ink and fountain solution. In addition, its low flash point is a flammable substance, which is a fire hazard. It also does not comply with ISO international standards. Volatile substances are anesthetic and can inhibit the central nervous system of humans, which is very likely to cause blood poisoning.
Many manufacturers use a mixture of kerosene and gasoline to clean the rubber roller. This mixed kerosene volatilizes slowly. The long-term retention on the surface of the rubber roller will swell the ink roller rubber layer, causing the rubber roller to change in size, resulting in uneven ink transmission and affecting printing. Quality, the surface of the ink roller is more prone to glaze, can not accurately measure the ink and water delivered, streaks appear during printing (such as: ink bar, water bar, etc.), flat net hair color, color change, rubber hardness change , which affects printing pressure and even shortens the life of the machine.
(2) New ink cleaning agent
It consists of a hydrocarbon with an emulsifier and an anti-corrosion agent and is a safe cleaning agent with a high flash point. It promotes the mixing of water and oil, produces an emulsification effect, and cleans oily and watery dirt. The emulsifier uses the principle of ink emulsification to wrap the surface of the blanket or the rubber roller. In the cleaning process, it must be mixed with water to perform the cleaning action by emulsification. The anti-corrosion agent has the effect of eliminating moisture corrosion and resisting corrosion of the metal roll by moisture. It produces less volatile gas, does not completely evaporate, can hang on the surface of the rubber roller for a long time, in order to maintain the viscosity of the surface of the rubber roller, the cleaning efficiency is higher, the rubber product is not eroded, the usage is reduced, and the storage is safer. .
Use a new ink cleaner to clean the rubber roller, give enough time, usually at a low speed of 4000 ~ 5000 rpm, clean for 3 to 5 minutes; keep the squeegee intact and clean, fully contact with the ink; moderate dosage (flash point The higher the detergent, the more convenient it is).
When cleaning the alcohol water roller, do not use an oil-soluble solvent to wipe the alcohol water roller. Use a special water roller cleaning agent to minimize the amount of ink on the water roller to maintain stable printing. Clean the ink on the alcohol water roller in time. . There are many reasons for the difficulty in cleaning the rubber roller. The ability of the rubber itself to cooperate with the chemical will affect the cleaning effect; the cleaning agent volatilizes slowly, and the operator washes off the cleaning agent when the cleaning agent has not fully functioned, which may cause cleaning difficulties; Some cleaning agents contain volatile, decomposable components such as alcohol, which make cleaning ability poor.
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