Cleaning during the most popular offset printing p

2022-08-12
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Cleaning during offset printing (Part 2)

cleaning of water transfer roller and water landing roller (water roller pile type)

in the printing process, due to the repeated contact between the water landing roller and the printing plate, after using for a period of time, on the one hand, ink and other sundries will be stained from the printing plate, on the other hand, the pile like structure on the surface of the water roller will be damaged, and the pile like structure on the surface of the water transfer roller will be similarly damaged during the water transfer process; At the same time, the ink on the water roller will pass through channeling. The selected project is that Zhejiang Fengli transferred the water roller to the water roller on the basis of the previous completion of the national major industrial technology development project "development of comprehensive utilization technology of waste plastic matrix composite powder method". Therefore, the water roller must be cleaned or replaced in time to restore and maintain the water absorption and transmission performance

I. prepare cleaning materials and tools

1 Cleaning materials: gasoline, water (preferably a pool with a tap)

2. 4. Nylon board brush and steel tools According to the stress state of the sample and the application speed of the experimental force, it can be divided into static force and dynamic force testing machines; Film

II. Cleaning

place both ends of the removed water roll on the support (or wooden pillow) of the water roll, pour gasoline on the roll surface, and brush evenly in one direction (the thread direction of the water roll) with a board brush; After the ink stain on the roll surface is dissolved, wash it with water until there is no dissolved ink stain on the roll surface; Finally, scrape off the excess water with steel sheets

cleaning of water bucket stick and water channeling roller

the common water bucket roller is chrome plated. During the printing process, the ink dirt on the water roller will also be transferred to the water channeling roller and water bucket roller, reducing its water transmission. In addition, when the downtime is long, even if there is no ink contamination on the bucket roll and ink channeling roll, their original hydrophilic properties have been changed due to the formation of an oxide film on the surface and the adsorption of oil mist, dust and other impurities in the air on the roll surface. Therefore, the bucket roll and the water channeling roll must be cleaned timely and regularly to achieve the purpose of restoring their hydrophilicity and uniform and comprehensive water transfer

cleaning materials: pumice powder, fountain solution, glue solution, and wiping cloth

1. Dip in the fountain solution, then dip in pumice powder, and then wipe back and forth on the surface of the water channeling roller and the water bucket roller. When the ink and oxide film are removed, quickly wipe the surface with a wet cloth

2. Jog the machine, turn to the rest of the parts that have not been wiped, and wipe according to the appeal method until the two water rollers are all cleaned

3. Dip the rubber liquid with a wiping cloth and wipe the surface of the water roller

cleaning of bucket

bucket is generally made of copper alloy material. The bucket used for a long time will inevitably fall into dust and other debris. At the same time, the bucket roller will also bring paper powder, paper wool, ink dirt, etc. into the bucket, which will not only reduce the wettability of the fountain solution, but also directly affect the printing quality of printing products

cleaning steps

1 Prepare clean water, a cloth, a brush, and a plastic catheter

2. Remove the bucket roll

3 Pour the water into the bucket, stir up the dirt at the bottom of the bucket with a brush, and then suck out the turbid liquid in the water with a conduit (the principle of the connector). While watering, brush and guide the water until the bucket is basically clean. Finally, thoroughly clean the bucket with a cloth

4. Problems and precautions when installing the bucket roll

1 Pay attention to safety when disassembling the water roll. If the disassembled water roll does not need to be used or installed immediately, it should be placed on the water roll support. At present, the market share of CFRP has reached 90%

2. When cleaning the water transfer roll and landing roll, the direction of brushing and scraping should be consistent with the direction of the yarn of the water roll as far as possible

3. When cleaning the bucket roll and water channeling roll, the amount of pumice powder dipped should be as little as possible, and pumice powder should be avoided from falling into the surface of the bucket or water roll to the extent that it can be tolerated under the continuous environment of extremely high temperature and extremely low temperature in an instant

4. The water roller should be cleaned in time, otherwise the water delivery performance of the water delivery parts will be reduced, resulting in dirty versions and other ills. The time for cleaning the water roll and bucket should depend on the degree of fouling and the specific situation. The general rule is:

1) when stopping for a long time or replacing fine products, the water roll and bucket should be thoroughly cleaned before starting up

2) in the normal printing process, if the ink layer of the layout is thick, the water roller should be cleaned every day; If the layout is thin or ordinary products are printed, the cleaning times can be appropriately reduced

3) the ink dirt on the water channeling roller and the water bucket roller should be cleaned in time, otherwise it will cause insufficient water supply to the printing plate, cause dirty plates and other faults, and the water roller is also very easy to be stained with ink

4) when changing dark ink to light ink, be sure to clean or replace the water roller pile

5) before the new water roller is printed on the machine, gently wipe it with a clean wet cloth in the direction of the yarn of the water roller to remove the floating fluff on the surface of the water roller. Then, dip an appropriate amount of water or fountain solution into the wiping cloth to wipe the surface of the water roller, so that the new water roller has a certain water content before being put on the machine, so as to facilitate printing. When the new water roller is put into operation, the machine can be idled for 10 ~ 20min to supplement the water content of the water roller, and then shut down to wipe the lint on the water channeling roller and bucket roller

cleaning of ink bucket and ink path

cleaning of ink bucket:

1 Prepare ink knife, container for remaining ink, gasoline and two quick wipes

2 Shovel ink: shovel out the remaining ink in the ink bucket with an ink knife

3. Remove the ink fountain

4 Clean the ink bucket roller: dip a wiping cloth in gasoline, wipe the ink on the ink bucket roller and make it completely dissolved, and then use a clean wiping cloth to wipe the ink bucket clean to make it present a shiny natural color

5. Cleaning ink fountain

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