Printing Picking solution – printing, printing failure – Printing Industry – 8-channel optic video multiplexer
Print In sheets after the embossing, rubber roller on the one hand, the ink stick to adhesive power to print runs Blanket Surface, on the other side of the paper seams, bite by bite the impression cylinder, with the rotation of impression cylinder, forced separation of paper and rubber roller. Adhesion in the rubber roller surface of paper received by the surface perpendicular to the paper, the paper from Blanket To pull down the surface tension force is called stripping, if the strip tension to an unbearable intensity of substrate surface, the surface of the paper fibers, fillers or Paint Ink on the blanket will be pulled down, piled blankets and printing plate, so that ink can not even complete the transfer to the paper on the absorption, causing network damage, loss of a small dot; print halftone image, the level of loss, blot made false false. Scraps of paper in the printing plate and blanket on the pile, serious cases will blanket Ge and bad, on scraps of paper stuck to the plate will be passed to sink in, reducing the role of wetting liquid.
Phenomenon appears to be napping blanket increase the frequency of cleaning, thus increasing the printing labor intensity also affected the efficiency of production, the same time, too much downtime, resulting in uneven ink for printing out Indian ink before and after the highly consistent product, there will be serious waste, resulting in unnecessary waste.
Paper Picking phenomenon caused by many factors, mainly two factors, one paper surface strength, the second is the printing of the strip tension. The strip tension in turn depends on the size of ink viscosity and printing speed.
Different paper, raw materials and Papermaking Technology is also different, surface strength varied widely, poor surface strength of paper prone to napping behavior, multi-color Offset printing When printing color in the blank, after some had been wetting liquid wetting the paper had printed after the paper was wet, the surface strength decreased, scuffing phenomenon will increase.
Way to solve the napping: First printing under
Printing Equipment And the characteristics of Indian products, select the appropriate paper surface strength.
Second, by adding ink notes to the Mexican oil or to the thickening agent to reduce the viscosity of ink and adhesive, which is poor surface strength of paper printing the most common method. Napping increases with the increase of increasing the viscosity of ink, while the viscosity of ink the most obvious effects of temperature, the printing shop as much as possible to maintain constant temperature, so that the printing shop to have a good production environment, tune in to add ink Mexican oil or when enough is enough agent to stick, otherwise it will lead to increased emulsion ink, dot gain increase and extend the drying time range of issues. Third, the surface of
intensity difference in the print paper, the printing speed should be controlled. Higher printing speed, paper and blankets when the peel strip tension, the more likely galling, the paper surface fibers, filler bonding some small, not uniform, some of the particle, fiber bonding strength of smaller, so the Printing speed is not great when the phenomenon occurs napping, but not serious. Most of the bond strength of particles or fibers rather, only the printing speed of over one critical point, the strip tension to a certain extent, will be more serious scuffing phenomenon occurred. But also with the speed increase, the phenomenon will continue to increase napping, so poor in the printed paper surface strength should control the printing speed, printing at a slower pace.
Fourth, replacement of blankets, or use talcum powder mixed sulfur clean blankets, blanket reduction of viscosity. Picking phenomenon sometimes occurs when printing is caused due sticky blanket, so each print job is completed, promptly dumping Edition, and blanket wash. In addition, the conditions and time permitting, print paper surface strength difference, the machine can be used to print color, it can reduce the galling phenomenon, it will not affect normal production.
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