Paper sticky rubber, have you encountered this situation?
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A printing house uses a monochrome offset printing machine to print a batch of packaging boxes with a material of 230g/m2 white cardboard. The printed pattern is large and the printing time is winter. When the operator finishes the preparatory work (inking, upper version) and starts to align the plate, the pressed paper is stuck on the blanket, and the printing cannot be started normally.
The technician of the printing factory consulted the author. The author analyzed that the ink viscosity was too high, and the temperature in the winter workshop was very low. The temperature of the rubber roller was also very low when the machine was turned on, so it was easy to cause the paper to stick to the rubber.
I recommend that the ink be baked first, so that the ink becomes soft and the viscosity is reduced accordingly. Then add an appropriate amount of dry oil to dilute the ink to further reduce the viscosity of the ink. It should be noted that although the adhesive can be added to reduce the viscosity of the ink, excessive addition of the adhesive remover may result in inaccurate back printing and color registration. It is also possible to add a thinner to reduce the viscosity of the ink, but excessive use of the diluent will affect the drying of the ink layer, especially in the case of very low temperatures in winter. Therefore, I recommend adding dry oil to reduce the viscosity of the ink. After the normal start-up, the temperature of the rubber roller will rise slowly, so that it can be printed normally.
In addition, in order to effectively avoid the phenomenon of paper sticking rubber, in addition to the above methods, the following measures can also be taken:
1. Appropriately increase the ambient temperature of the workshop. When the ambient temperature of the workshop increases, the viscosity of the ink will decrease relatively.
2. Appropriately reduce the printing pressure while ensuring uniform printing pressure.
3. Before the official printing, let the equipment idling for a period of time at the normal printing speed, so that the rubber roller can rapidly heat up during the high-speed friction process, thereby achieving the purpose of reducing the viscosity of the ink (under the action of shear stress during the movement of the rubber roller) , the viscosity of the ink will also be reduced).
4. Use the “deep ink thin print” method to adjust the ink color to a proper depth. When the hue is consistent with the original, the thickness of the ink layer is appropriately reduced.