As we all know, when the ink in the ink bucket forms a layer of the film due to the surface drying in the printing process, either a stirring device is placed or the ink is simply poured out, otherwise, the film will adhere to the roller, resulting in uneven layout, resulting in disordered knife mark pollution. The reason is that the ink industry tends to:
(1) Ink drying too fast;
(2) Poor ink fluidity;
(3) The ink precipitation has dried. However, we do not know that this phenomenon is caused by the evaporation of the ink system, or the gradient of oxidation and drying, while the printing industry believes that: the ink bucket or ink bucket structure is not good, resulting in the stagnant part, the air leaked from the dryer dries the surface of the ink, or the hot air blows the ink into the ink bucket.
Although there are different opinions about this phenomenon, printing operators generally adopt the following treatment methods:
(1) Do not use fast-drying ink;
(2) Medium and slow drying solvent was added;
(3) Replace the deteriorated ink (that is, from poor liquidity to excellent liquidity);
(4) Keep stirring in the ink bucket;
(5) A closed top cover is arranged on the ink bucket;
(6) Adjust the hot air blowing angle. Generally, people with printing experience and common sense will adjust the speed of the printing machine when the drying speed is too fast, or the ink concentration is too light, or the flow is poor, or the ink thixotropy is large, or the link is static. This method not only prevents the ink from drying on the printing plate early, but also overcomes the crust formed by the ink film-forming in the package printing, and eliminates the image and text speckle fault.