Operation and adjustment of closed scraper system (2)
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Operation and adjustment of the closed scraper system
1. Install and adjust the ink chamber
Install the ink chamber onto the flexographic press as directed by the manufacturer of the closed scraper system and gently contact the upper and lower scrapers with the anilox roller. In addition, check whether the contact between the upper and lower blades and the anilox roller is balanced and consistent. In fact, many of the problems that occur during the printing process are caused by incorrect ink chamber locations or incorrect seal installation.
The ink chamber is placed so that it is parallel to the centerline of the anilox roll and its position is centered relative to the ends of the anilox roll. In the process, be sure to remove the seal and replace the scraper with two stainless steel blades of the same width. After adjusting the position of the ink chamber to the center, the blade can be replaced with a properly sized scraper.
Next, start the loading mechanism and, if necessary, re-adjust the base until the ink chamber is parallel to the anilox roller. If the doctor blade or ink chamber contacts the anilox roller, the system must be realigned to prevent irreversible damage.
Finally, if the closed scraper system is pneumatically mounted, check that the distance between the scraper and the anilox roller is appropriate, otherwise damage may occur when the anilox roller and the scraper grip are in contact. In addition, if the blade is not evenly contacted with the anilox roller, serious leakage problems may occur.
2. Ink supply and idling
After the ink chamber is adjusted, the ink pump is activated to start injecting ink into the ink chamber. It is important to keep in mind that the ink pump should not be operated too fast, otherwise it will cause excessive pressurization and leakage. The amount of ink or varnish that is pressed into the ink chamber may be slightly larger than the amount required for the job.
Once the ink chamber is filled with ink or varnish, the idle button can be activated. If a metal scraper is used, it may make a loud humming sound. Some high quality scrapers or non-metallic scrapers can be used. Effectively reduce and reduce this noise.
3. Visual inspection
After the system has been running for a while, carefully check the attitude of the system, tube and ink pump. The operation of the system should be smooth; the tubes should not be entangled and should not fall under the ink pump; the height of the return tube should not be lower than the surface of the ink or varnish in the barrel. In addition, check the return of the ink or varnish, and adjust the speed of the circulation pump if necessary.
4. Adjust the blade pressure
First, reducing the pressure on the anilox roll in the ink chamber is the first step in adjusting the pressure of the doctor blade. A strong "ink flow" may occur on the surface of the anilox roll. Next, carefully increase the pressure or slowly rotate the pressure regulating handle until the “ink flow” on the surface of the anilox roller disappears. At this time, the blade pressure reaches the optimum state, the so-called “kissing pressure” state, not only the blade It has the best performance and minimal wear.
Cleaning of the closed scraper system
When using a closed scraper system, cleaning is a very important part and one of the most overlooked. The cleaning steps are roughly as follows.
(1) Turn off the ink pump and let the ink or varnish flow back naturally.
(2) Rinse the closed scraper system with clean water or special cleaning solution. Note that the cleaning solution should not be used repeatedly. Otherwise, it can only dilute or dilute the ink and varnish, but it cannot be thoroughly cleaned.
(3) Remove the ink chamber and clean it offline, which saves time and money.
(4) The anilox roller should also be thoroughly cleaned, otherwise the residual ink or varnish may dry on its surface. Ultrasonic or high-pressure automatic cleaning system can be used for cleaning, which can reduce the damage to the anilox roller. When water-based ink or varnish is used, the effect of cleaning the anilox roller with hot water is better. If the ink or varnish has dried on the surface of the anilox roll, it can be removed with a soft cloth or a special brush.