Industrial Rubber Roller Printing process
Printing process, and occasionally encounter printing appear streak or pale color phenomenon, this is known as no ink and ink roller failure, because the packaging printing ink pigments, fill the bulging lead to the overall plastic gel Caused by.
From the theoretical point of view to explain: the yield value of ink is too high, the ink is too short and become cheese-like. From a practical point of view: the pigment in the ink, too much filler, only to glue or in the storage process of water into the ink system and lead to partial flocculation.
People for the expansion or gelling to continue to stir the ink in the ink fountain, or in the fountain to install a stirrer, but also in the ink put an iron bar, the ink pushed to the fountain roller to maintain the packaging printing ink flow. Operators prefer to use medium, high viscosity ink or thinner to adjust the ink (but this must be with the use, otherwise it will continue to swell or gel). And some manufacturers are the ink drained, replace the flow of good and strong resistance to ink and then go to print.
Throughout this failure, around this issue a rough discussion of this phenomenon, and to exclude the failure of the new method and packaging and printing industry colleagues exchanges.
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In the installation and removal, did not do lightly, so that the roller or rubber surface damage. Polyurethane rubber roller head and bearing with the tight or poor bearing performance, so that the polyurethane roller by friction, extrusion, easy to speed up the polyurethane jiang chapped, aging. Polyurethane rubber roller on the ink, ink and other impurities in the accumulation of too much to accelerate the friction between the polyurethane roller, aging, so that the surface of the polyurethane roller filled with Ma eyes, can not accurately pass water, ink.
Polyurethane rubber roller cleaning agent selection improper, such as gasoline, reducing agent, strong acid, alkali and other erosion, will cause the polyurethane rubber roller surface cracking, dregs. Polyurethane rubber roller between the pressure is too large, so that the rubber roller due to extrusion deformation, rubber heat expansion, and polyurethane liner directly shelling, resulting in polyurethane roller scrap. Workshop temperature is high, resulting in polyurethane roller in the course of the operation can not be timely cooling, rubber cohesion temperature continues to increase, accelerate the aging of rubber. Ink drying too fast, serious emulsification, will continue to accumulate in the polyurethane roller at both ends, thus increasing the pressure between the polyurethane roller here to accelerate its wear and aging. Fountain at both ends of the ink release key to die, resulting in polyurethane adhesive can not get both ends of the ink, so that the polyurethane roller often dry friction and damage. In the multi-color printing press, due to a small number of prints, resulting in other color groups of polyurethane roller long idle, so that it is in a dry friction and damage. The plate is not tight or the folder is not tight, so that the printing plate dragging the tip often broken, when the polyurethane roller close to the plate cylinder running, the rubber roller rubber rubber surface will be scratched, resulting in polyurethane roller scrap. Polyurethane roller improper storage, for example, no light preservation, etc., resulting in polyurethane roller was crushed, was sharp objects scratched.