Closed scraper system operation adjustment and cleaning method

Closed Scraper System Operation and Adjustment

1. Install and adjust the ink chamber

    Install the ink chamber on the flexographic printing press so that the upper and lower blades can gently contact the anilox roll to check if the contact is even and consistent. Place the ink chamber so that it is parallel to the centerline of the anilox roller, centered relative to both ends of the anilox roller. After removing the sealing strip and replacing the doctor blade with two stainless steel blades of the same width, after adjusting the ink chamber to the center, the blade was replaced with an appropriately sized doctor blade.

After that, start the loading mechanism and readjust the base until the ink chamber is parallel to the anilox roller. Finally, if the closed scraper system is pneumatically mounted, check that the distance between the scraper and the anilox roller is appropriate. In addition, if the scraper blade is not in contact with the anilox roller, serious problems of seepage can occur.

2. Ink supply and idling

After the ink chamber is adjusted, start the ink pump and start injecting ink into the ink chamber. The speed of the ink pump cannot be too fast, otherwise it will cause excessive pressure and leakage. Once the ink chamber is filled with ink or varnish, the idle button can be activated. If a metal spatula is used, a loud buzzing sound may be generated. Using some high quality spatula or non-metal spatula can effectively reduce and reduce noise. .

3. Visual inspection

After the system has been operating for a while, carefully check the system, tubes, and ink pump status. The operation of the system should be smooth; the pipes cannot be tangled together and cannot fall under the ink pump: the height of the return pipe cannot be lower than the surface of the ink or varnish in the bucket. In addition, check the backflow of the ink or varnish, and adjust the speed of the circulation pump if necessary.

4. Adjust blade pressure

The first step in adjusting the squeegee pressure is to reduce the pressure of the ink chamber on the anilox roller. Carefully increase the pressure or slowly turn the pressure regulator handle until the “ink flow” on the surface of the anilox roller disappears, and the squeegee pressure is optimal.

Closed scraper system cleaning

(1) Close the ink pump and let the ink or varnish flow naturally back.

(2) Use clean water or a special cleaning solution. The cleaning solution must not be reused.

(3) Remove the ink chamber and clean it off-line. This saves time and money.

(4) Thoroughly clean the anilox roller, otherwise the residual ink or varnish will dry on its surface. Ultrasonic or high pressure automatic cleaning system is used during cleaning to reduce the damage to the anilox roller. If water-base ink or varnish is used, the effect of cleaning the anilox roller with hot water is also better.