Ink is always not clean, rooted in this!

Ink scraping clean bothering many flexible packaging manufacturers, has ten kinds of reasons that cause scratch is not clean, kept the spare! ! ! ! 1, ink viscosity is too high ink viscosity rise, its surface tension also increases accordingly, increase the force between them, make the scraper will increase in the process of contact with the ink printing ink on the impact of the scraper, undermine its balance, causing ink scraper can't more than version will roll over completely shaved, directly affects the quality of the product. 2, squeegee pressure is too small, under normal circumstances, just boot, squeegee pressure often set is small, with the improvement of machine speed, version of the rollers on the ink on the impact of the scraper will increase with the increase of the machine speed, destroy the original balance, direct cause is not clean. 3, ink printing ink into the water or the use of time is too long in use after a long time, on the one hand, in the process of long cycle will result in printing ink pigment precipitation, change to the composition of ink, on the other hand, the water vapor in the air will be due to the volatilization of solvent coagulation, into the ink, the same change to the composition of ink. To alter the overall performance of the ink, the ink scrape performance is greatly reduced, increasing the difficulty of the scraper scrape directly, cause scratch isn't clean. 4, dry solvent too fast or slow dry mixed solvent too fast dry, besides make the ink viscosity to improve in a short time, will cause the ink adhesion in version roller spare parts, due to solvent evaporation fast, adhesion on version of roller are gel ink will, in the version of the roll pass scraper, due to the gel ink adhesion strength is higher, scraper will not operate in the version of the roller under the condition of a week to scrape it, thus brought directly to the printing substrate, cause scratch isn't clean. Volatile solvent itself slowly, causing the version of the roll over the remaining part of the ink is not dry solid on version of roller surface in time, its state is similar to have dot part of the ink, so the printing substrate through the version of the roll over version of the roll over part of the ink easily transferred to the printing substrate and cause scratch isn't clean. Version 5, roller used for too long because of the long time use, version of the roll surface due to the force of blade abrasion, the surface will be more and more smooth, have the affinity of roller and ink is more and more strong, increasing the difficulty of the scraper scrape directly, cause scratch isn't clean. 6, Angle of the blade assembly too soft, taiping scraper assembly too soft, Angle too at ordinary times, due to the effect of gas pressure, can make the blade in the version of the roll surface is scraping point bending state, cause of scraping is not & other; Point & throughout; The relationship between, but & other; Surface & throughout; Relationship, so can't effectively will roll over the remaining parts namely networks without ink scrape, cause scratch isn't clean. 7, version roller assembly different heart version roller assembly heart phenomenon, usually within 10 silk beat will not affect the matching color and the quality of the product. When version roller by the designed oval diameter longer side operation to the shorter side of the instant diameter, the distance in an instant longer, because of the scraper is the external force on version of roller, therefore in the process of transformation has lag, forming a period of time the pressure of the blade in the moment that is less, so due to the beating of the version of roller blade pressure in a version of a tight one loose, resulting in the phenomenon of local scratch is not clean. 8, and the problems of solvent A, because of adding used in printing ink solvent is therefore solvent water will directly damage the overall performance of the ink, cause not clean. B, the ratio of solvent, directly cause quick dry ink or slow to do, cause not clean. C, the solvent itself have impurities, such as the purity is not high, the water content of the high. 9, ink circulation loop of ink viscosity will make it difficult to control on the one hand, on the other hand, because the ink has the feature of thixotropy, without circulation will reduce the various properties of ink, because the circulation also can cause ink in ink tank surface crust, directly increase skinning dry ink adhesion on version of roller, scraping dirty phenomenon. 10, stir the ink stick problem due to stir the ink stick bumps on the surface after use some more or less adhesion with ink, with the increase of use, the amount of ink also will increase, when solvent volatilization completely leaves dry ink. In the use process, because the ink in ink tank is not fully stirred bumps on the surface of the ink stick dry ink wetting, resulting in stir the ink gel strong ink stick with the version of the roll operation in the process of transfer to the version of the roll surface, due to the adhesion force and strong, so the doctor will not operate in the version of the roller under the condition of a week to scrape it, thus brought directly to the printing substrate, cause not clean production, part of the more obvious this phenomenon especially no branch.