Flexo Printing Product Failures and Solutions III

Third, the ink is too weak or too thin and shallow

1. Phenomenon: The ink color intensity is too low and too light. The ink saturation is not enough and the color density is insufficient.

2. Reasons: (1) The solvent is used too much or the viscosity is too low, which affects the ability to drive the pigment; (2) The anilox roller is worn or uncleaned, and the hole is blocked; (3) The ink is not evenly stirred. Settling, insufficient coloring power, pigment dispersion; (4) Improper soft and hard printing plates; too high selection of anilox roller lines, insufficient ink volume; (5) Inadequate ink roller adjustment, low printing pressure; (6) In the transfer process of the ink, improper use of the ink transfer roller; (7) In the aqueous ink, the volatile compound is excessive and the ink layer is thin; (8) The printability of the substrate is poor; (9) The ink diluting agent is too much; (10 ) The viscosity of the ink is too high to cause poor transfer.

3. Solution: (1) Add new ink and adjust to proper viscosity; (2) Replace old roller with new or re-engraved anilox roller (also reduce ink viscosity); (3) Full before adding ink fountain Stir the ink removed from the barrel; (4) Replace the proper one; (5) Reduce the number of reticulate lines; Adjust the ink roller so that excess ink is attached to the roller to increase the pressure; (6) Replacement and printing The material conforms to the ink transfer roller (uses the low hardness); (7) The volatile compound exceeds 3%; (8) Selects the printing material according to the printing product request. When the paper with strong ink absorption property is selected, the ink layer remaining on the surface of the paper during printing is thin, so the reflection density is low, and the printing product is lighter in color. It is generally believed that the thickness of the plain ink layer is 1 to 2 μm, and the thickness of the flexo ink layer is 2 to 5 μm. The thickness of the gravure ink layer is 10μm, which can meet the printing requirements; (9) re-adjust the ink; (10) Reasonably adjust the ink viscosity.

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