Differences in gloss of prints caused by ink during printing

The gloss of prints is poor and not bright. Except paper factors, the ink is mainly diluted due to excessive dilution of the ink, the resin precipitates and loses the linking effect. The dryness of the ink is slow or the absorption of the paper is too strong. As a result, the ink penetrates into the paper and the print is uneven and dull. Light. Approach

(1) Add new ink or add bright light to the ink.

(2) Use high-gloss ink or use poorly absorbent paper.

(3) Add some desiccant properly.

(4) The printed matter that has been printed can be treated with varnish. Related Links Another manifestation of poor print gloss is “whitening”. This failure is mostly caused by a transparent white ink film that appears during the rapid evaporation of solvents after high-speed printing in the printing process of volatile drying printing inks. This phenomenon is sometimes temporary, but most of it may be long-lasting. This is due to the fact that the cooling (device) blowing or the air in the vicinity of the drying printing ink film is cooled to the dew point, that is, the water (vapor) is absorbed and then returned to the ink film to be condensed. In addition, solvents such as inks or pigments in aqueous systems can also cause a poor gloss of printed ink film. The prevention method is to adjust the solvent used for the printing ink, reduce the amount of solvent that volatilizes quickly, and control the relative humidity in the air of the workshop to be less than 65%.