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Printing roller use note points

2021-05-09

People in the printing industry all know that the rubber roller is one of the key components of the printing machine and has a great influence on the printing quality of the product. It can be said that without a good printing roller, it is impossible to print high-quality products. Therefore, how to correctly and scientifically and reasonably use and maintain the printing roller is a production skill that the printing personnel should master. It can improve production efficiency. To ensure the printing quality, to maintain the stable mechanical properties, chemical properties and printability of the roller, and to extend the service life, it plays a decisive role.

First, pay attention to keeping the surface of the rubber roll clean to increase its viscosity. In the printing process, to achieve ink transfer, ink uniform, the surface of the colloid must maintain a certain viscosity. Due to the paper dust, paper hair, and Other properties that affect the ink transfer, it is easy to create uneven ink defects. In addition, due to the long use of the rubber roller, the surface of the roller suffers from the loss of moisture, and its adhesive performance will inevitably decrease. In order to maintain a certain degree of stickiness of the rubber roller, it is necessary to prevent the ink from drying too quickly to cause crusting of the roller, and to control the amount of dry oil required for the ink to be applied with dry oil. In general, the oil type ink plus white dry oil does not exceed 10%; resin ink plus white dry oil consumption does not exceed 5%; red dry oil plus heavy volume is about 2% is appropriate, should avoid the printing roller knot knot ink effect printing quality. In order to keep the rubber roller clean, the rubber roller should be cleaned in due time, but the impurities such as impurities on the colloid, paper dust and other appendages should be added to improve the ink transfer performance. In the offset printing operation, ink emulsification is a must, however, due to the "water and ink" and the resulting ink emulsification, will form a hydrophilic base on the smooth roller, the deink roller, the fountain solution will also be corroded Plastic surface. Therefore, the fountain solution should be as small as possible without stickiness.

Second, pay attention to grasp the right position of the printing rubber roller on the printing machine, avoid damage caused by improper use and bad ink. Whether the position of the rubber roller is adjusted or not is directly related to the uniformity of ink transfer and ink brushing, and also relates to the durability of the printing roller. Therefore, the contact pressure between the ink rollers should be kept even and moderate. If the contact pressure between the ink roller and the iron roller is too large, on the one hand, the roller will be deformed by pressure, and the colloid will easily spread by spreading heat. Heat and easy to thin, affect the quality of printing ink; on the other hand, it is easy to damage the roller head (bearing) or shaft hole. If the level of the ink roller is uncomfortable, adjusting it too high may result in maldistribution. Adjusting it too low will scratch the colloid and increase the wear of the plate. Therefore, the ink roller should be adjusted to keep a balance with the plate layout, so as to ensure uniform ink brushing across the entire layout. A high degree of contact between the ink roller and the printing plate, generally can put a 40g or so high toughness paper on the printing plate. When the ink roller is rolled up, the note can be pulled to have a sense of pressure resistance.

Third, the new cast rubber roller should not be put into use immediately. Because the internal structure of the newly cast rubber roller is not stable enough, if it is put into use immediately, it is easy to reduce the service life. Therefore, the new rollers that have just been ejected should be left for a period of time so that after the rollers are exposed to the external environmental temperature and humidity, the relative stability will be maintained. This will increase the toughness of the colloids and thus increase the durability.

Fourth, when installing and disassembling, it should be handled with care, not touching the roll neck and the rubber surface, so as to avoid damage, bending or damage to the rubber surface of the roll body. Roll neck and bearing should be tightly matched. If it is loose, repair welding should be done in time. When the printer is shut down, the platen roller and the plate cylinder should be released from contact in time to remove the load to prevent static pressure deformation. After the printing is finished, the ink on the roller should be cleaned. Cleaning ink should choose special cleaning agent, and check whether there is still paper on the rubber roller, paper powder has not been washed away, paper hair, paper powder generally stay in the uniform ink roller, need to take a cloth to wipe.

Fifth, rubber roller shaft, bearings should pay attention to maintain good lubrication. Because the accuracy of the rubber roller head and bearing directly affects the effect of ink transfer and ink distribution. If the lubrication is bad, the roller shaft head, bearing wear and clearance, will inevitably lead to uneven printing ink. At the same time, it will also cause print marks due to bad conditions such as rubber dispensing and slipping. Therefore, usually should be ground to the rubber roller head, bearing lubrication oil to prevent the normal wear of the machine wear roller to ensure print quality.

6. A hardened film of ink is formed on the surface of the rubber roller, that is, when the plastic surface is vitrified, pumice powder is used to grind it off. When cracks appear on the surface of the rubber roller, grind it off as early as possible.

Seven, on the correct storage of idle rubber roller. After the cots to be used are to be cleaned, the colloids are sealed with a plastic film and stored in a cool, dry and ventilated place, in a vertical or horizontal state. Avoid storage with acids, alkalis, oils, and sharp hard materials to prevent corrosion and bruising. Don't cut a few roots or stack them upright next to the wall to avoid undue loss of the gel. After the roller has been stored for 2 to 3 months, it should be changed in the opposite direction to prevent it from being placed for a long period of time. Bend deformation and take care to prevent rust on the shaft head. In the process of transporting waste rubber rollers to the processing and casting process, it is strictly forbidden to throw chaotic pressures or heavy pressures to keep the cores of the roller cores from being eccentric or bent so as to ensure the normal use of the roller cores.

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