Solutions to Dirty, Stencil, and Paste Caused by Ink Factors

1.
The ink viscosity is too large to produce a pattern

If the ink viscosity is too large, in addition to making the imprint transfer difficult, it will also destroy the conditions for the middle of the ink layer to break, so that the remaining ink layer on the layout will be insufficient
.

Treatment method: Add some detackifier in an appropriate amount to reduce the viscosity of the ink without increasing the fluidity of the ink too much
.
For printing fine products, it is better to use a release agent to reduce the viscosity of the ink, because it does not increase the fluidity of the ink while reducing the viscosity, and it is good for the drying of the ink .
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.
However, the dosage should be appropriate.
Excessive dosage will affect the gloss of the imprint.
Generally, the dosage of yellow ink is 1%-1.
5%, and the other color ink is about 2%
.

2.
The ink viscosity is too small and it is easy to paste

Ink with low viscosity is easy to emulsify, causing fouling, making the ink unable to transfer normally, and gradually accumulating pigment particles on the ink roller, printing plate and blanket
.
When the pigment particles accumulate to a certain thickness on the printing plate, it will cause smearing
.
Sometimes the pattern is caused by insufficient ink layer remaining on the layout
.

Treatment method: appropriately add some thick varnish, but not too much to avoid affecting other properties
.

3.
Excessive ink fluidity will cause the dots to expand and deform, and the ink fluidity is insufficient to produce patterns

If the ink fluidity is too large, the ink layer will spread, the geometric size of the print will be enlarged, and the print will not be reproduced correctly

Treatment method: The fluidity of ink is not completely suitable for all printing machines, and high-speed machines have greater fluidity than low-speed machines

4.

The ink particles are coarse and play an abrasive role on the printing surface.

Treatment method: When printing, use ink made of pigments with small specific gravity as much as possible

5.

In printing, in order to make the printed parts dry quickly, some operators add desiccant to the ink that has drying performance, which promotes the aging degree of the ink roller, and makes the ink thicker and emulsified, so that the ink layer on the printing plate cannot be Broken from the middle, most of them remain on the printing plate, resulting in a pile of plates

Treatment method: For the paste plate caused by too much drying oil, it cannot be solved by increasing the moisture of the plate.