Corrugated box direct flexo faults in 17 cases (5-10)

5. Noise (color patches)

Causes and solutions:

(1) The pad surface is not smooth or uneven in thickness. 1 Pressurize the pad and plate 2 to increase the ink viscosity; 3 increase the thickness of the ink layer; 4 use a softer pad.
(2) Improper plate pressure. Adjust printing pressure.
(3) The surface of the liner is textured. Replace the gasket.
(4) Ink viscosity is too low. Add fresh ink and increase the viscosity of the ink.
(5) Add too much water to the ink, so that the ink system loses its balance. Add fresh ink or add dehydrating agent to ink.
(6) The anilox roller is dirty. Clean or replace the anilox roller.
(7) The ink in the printer is contaminated. Clean the machine and replace the ink.
(8) The value of ink ink is too low. Check and properly adjust the ink PH value

6. Rows of bone pattern

Causes and solutions:

(1) Improper adjustment of ink volume. Reduce the amount of ink on the surface of the anilox roll to increase the pressure; 2 Change the squeegee; 3 Change the ink formulation.
(2) The anilox roller is worn, dirty, or the number of lines is too low. Clean the anilox roller or replace the anilox roller with a high number of screens.
(3) Plate is too hard. Use a softer plate.
(4) Ink viscosity is too low. Improve the viscosity of ink.
(5) Plate is too smooth. Clean or replace the plate.
(6) Insufficient printing pressure. Increase the pressure of printing.
(7) The cardboard is uneven. Replace flat, unpitted cardboard.
(8) Ink viscosity is too high. Appropriately reduce the viscosity of ink.
(9) The ink pH is too low. Check and adjust the ink pH.
(10) The leveling of ink is not good. Add the leveling agent (superposition agent) in an appropriate amount.

7. Imprinting is not true (outcrop)

Causes and solutions:

(1) The plate pressure is too low. Increase pressure.
(2) The ink layer is too thin. Increase the ink film thickness: 1 increase the viscosity of the ink; 2 reduce the anilox roller gap; 3 gradually increase the amount of ink supplied by the anilox roller; 4 adjust the ink formulation for the cardboard.
(3) The cardboard surface is too rough or too wet. Replace cardboard or conduct humidity conditioning.
(4) Ink drying is too fast. 1 add slow drying agent; 2 stop blowing or heat drying; 3 increase the degree of machine.
(5) The ink pH is too low. Check and adjust the ink pH.

8 pinhole money eye

Causes and Solutions

(1) Add too much defoamer, or defoamer is insoluble with ink. Replacing ink or adding fresh ink without defoamer can also contact the ink supplier.
(2) The surface tension of the substrate is too large. Add suitable additives.
(3) Too much foam in ink. Remove foam or replace ink.

9. "washboard" phenomenon

Causes and solutions:

(1) The shrinkage of core paper and face paper is not the same. The cardboard production line is in production to solve the "washing phenomenon" by improving the starch formulation and improving the production line process.
(2) Incorrect plate pressure. Adjust the plate and board pressure.
(3) The surface of the tissue becomes wet due to the ink. Consult ink or additive suppliers.
(4) The ink layer is too thick. Reduce ink layer thickness or use absorbent cardboard.
(5) The ink is too thin, and the peak volume is inconsistent with the amount of ink in the valley. 1 Improve the production process of cardboard production line; 2 Increase the thickness of ink layer; 3 Add transfer agent in ink.
(6) Ink viscosity is too low. Add fresh ink and increase the viscosity of the ink.
(7) Incorrect ink formulation. Contact the ink supplier.

10. Ink dark

Causes and solutions:

(1) Ink viscosity is too high. Reduce the viscosity of ink.
(2) Ink colorant content is too high. Add; lighter or reduce ink thickness.
(3) The ink layer is too thick. Reduce the ink film thickness: 1 reduce the viscosity of the ink 2 increase the scraping pressure of the blade; 3 adjust the ink formula (reduce the transfer 4 reduce the speed of the machine; 5 reduce the amount of ink transferred by the anilox roller.
(4) The ink is contaminated and not clean. Clean the printing device and replace the ink.

(to be continued)

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