Gravure printing ink common fault causes and exclusion three

Ten, printed scratches:

the reason:

1. There are debris or ink particles in the ink that are thick and hard and brittle;
2, the ink viscosity is too high;
3, ink adhesion to the printing plate roller is too strong (affinity);
4, ink dry too fast or too slow;
5, roller surface is not smooth;
6, the chrome is not good, the pattern is too deep;
7. Scraper is not straight or damaged;
8, pressure and discomfort;
9, scraper and version roller roller angle discomfort.

Method of exclusion:

1. It is an ink problem, re-filter the ink, adjust the ink viscosity, replace the ink (texture loose and delicate) or adjust the ink dry speed;
2. The problem of roller plate printing, use flat and smooth rollers, correct plate lines or re-plate, and re-chrome plate;
3, is a scraper problem, use a straight sharp blade (stiffness and rigidity), adjust the knife angle or adjust the pressure, special scratches should be on the back of the scraper with a 1-3mm thick rubber or foam sheet .

Eleven, ink blocking version:

the reason:

1, too dry ink;
2, the viscosity is too large;
3, mixed with paper or plastic crumbs, etc.;
4, ink resoluble poor;
5, ink crust or hair on the plate (dry ink knot in the print);

Method of exclusion:

1, add slow-drying solvent adjustment ink;
2, dilute ink to adjust viscosity;
3, filter the impurities in the ink;
4, adjust the hair angle;
5, add real solvents;
6, re-cleaning plates or printing a section;
7. Add antioxidants.

Twelve, whitening of ink film

Because:

1. The rainy season in which the ambient temperature is too high or the humidity is too high makes the surface of the ink filming process whitish;
2, the ink is too fast drying solvent so that the ink in the volatile process is not balanced and produce ink mist.

Method of exclusion:

1, reduce the environmental (workshop) humidity;
2, increase hot air drying and pay attention to cooling after rewinding, compounding, etc.;
3, increase the true solvent (such as cyclohexanone) to make the dry speed reduce;
4. Change the slow drying plasticizing solvent to resist moisture infiltration.

XIII.

Because:

1. Imprinting is uneven and results in imprinting;
2, the pressure of the printing plate is too heavy;
3, ink viscosity is insufficient (to make the ink in the printing plate plate pattern flow out before printing);
4, electrostatic phenomenon.

Method of exclusion:

1. Adjust the pressure balance;
2, adjust the ink viscosity and concentration;
3, increase the drying speed;
4. Add antistatic dispersant to the ink fountain or connect a grounding wire to the printer.

(to be continued)