Daily maintenance methods and skills of the hottes

Complete introduction to daily maintenance methods and skills of printing cots (I)

I. installation and debugging

1. Loading and unloading

when installing cots, the shaft head and bearing should be matched to ensure a certain degree of accuracy and cleanliness. They should be handled with care and should not collide with the shaft head and the rubber layer, so as to avoid damage, bending and damage of the roll body

2. Lubrication

the rubber roller shaft head and bearing should always be effectively lubricated. If the poor lubrication accelerates the implementation of made in China 2025, it will cause the wear of rubber roller shaft head and bearing, increase the gap, and even cause uneven printing. At the same time, it will also cause printing bar marks due to bad conditions such as rubber roller jumping and sliding. If there is no effective lubrication during continuous operation for a long time, it will also cause heat generation in the bearing and shaft core, causing the rubber surfaces at both ends of the rubber roller to be worn due to thermal expansion, so that the rubber surfaces at both ends will have pitting, glue dropping and cracking

3. Debugging

the pressure between the rubber roller and the rubber roller and the printing plate should be adjusted appropriately according to the elasticity and hardness of the rubber and its role in the printing process. Generally, a feeler gauge of 0.15 ~ 0.20mm (the feeler gauge should be lubricated to avoid damaging the rubber surface) is used for testing, and the radial contact pressure of the rubber roller must be uniform. Otherwise, running for a long time will cause pitting, glue falling, cracking, glue opening and other phenomena on the rubber roller at the end with high pressure

two people think that the verification regulation of the electronic universal testing machine is more practical and reasonable, and the use and maintenance

1. Before printing, check whether there are foreign matters between the rollers, whether the rubber rollers are intact, whether the pressure between the rollers is uniform and consistent, confirm that it is normal, and then print after cleaning

2. During printing,

the rubber roller should always maintain a good contact state during operation, and the stress should be uniform. No matter the width of the print, the entire rubber surface of the cot should be lubricated with ink oil; Depending on the amount of ink accumulated between the cots, the ink amount should be adjusted in time to ensure the printing quality

under the premise of ensuring the printing speed, in order to prevent the ink from drying too fast, the viscosity of the rubber roller is reduced, and the surface is crusted, the amount of dry oil should be controlled for the ink that needs to be added with dry oil, so as to prevent the non inking and uneven ink transmission of the rubber roller in operation

3. After printing

it is necessary to timely separate the roller from the roller and the roller from the printing plate, remove the load pressure, and prevent the rubber surface from deformation caused by static pressure. The residual ink on the surface of the rubber roller shall be cleaned in time to prevent ink blocks, ink films, ink excrement and dirt floating on the rubber surface due to drying (especially the ink blocks on the two ends of the nylon roller) from crushing and damaging the smoothness of the rubber surface during re operation, and serious pitted surface slag falling phenomenon will occur

4. Cot cleaning

cots must be cleaned with special cleaning agent before and after printing to keep the cot surface clean and ready for use

if the cleaning is not timely, the ink will adhere to the pores through the fluffy pores on the surface of the cot, and the paper wool and dirt will adhere to the surface of the cot. If the parking time is too long, the ink film will cause the contact surface of the two rollers to adhere, and the rubber surface will be torn when driving again, so that the rubber rollers will be scrapped

if the cleaning is not in place, it will produce glaze phenomenon, resulting in the reduction of ink affinity and ink transmission, and even deinking. Vitrification improves the surface hardness and reduces the elasticity of the rubber roller, and accelerates the wear of the rubber roller. Otherwise, the heater will be damaged when it is powered on, resulting in pitting and cracking on the rubber surface, causing slag dropping, and affecting the printing quality

note: vitrification refers to the phenomenon that the surface of the rubber roller hardens into a mirror

5. Requirements for cleaning agents

① non flammable, safe and reliable, and no pollution to the environment