Toppan gold and silver ink printing failure analysis - fade, pull hair, paste version

Third, the reasons for quality defects such as discoloration, lamination, stencil, etc.

1. Printing gold and silver ink appear faded. Due to the improper control of the ink-adjusting process and operation technology, such as the use of gold and silver inks for ink formulation, there is no use of gold dipstick oil and dilute silver oil for diluting and blending. If non-specific thinners are used for blending, their affinity is not good, and the gold after printing is not good. Silver powder easily falls off the surface of the paper. On the other hand, when the printing pressure is slightly insufficient or non-uniform, it will also cause the ink on the printing plate to be colored and the visual effect of the ink color is poor. To overcome this drawback, if blindly increasing the amount of ink to be used to satisfy the beauty of the layout ink color, Visual requirements, this will inevitably arise because of the lack of pressure and ink floating situation, it is prone to the disadvantages of the discoloration process. Therefore, to adjust the printing pressure, the pad plate should be flat and uniform, and the pressure should be sufficiently cushioned so that the gold and silver ink after embossing can penetrate into the paper fiber, and the ink layer firmly adheres to the paper surface. In order to reduce or avoid the chance of fading, it is also necessary to apply good ink transfer technology, except that gold oil and silver ink are used to adjust gold and silver inks. It is also appropriate to consider adding a small amount to gold and silver ink. Transparent ink and white ink to increase the adhesion of gold and silver ink.

2. Printing and silver inks have problems with nap and paste quality. When gold and silver inks are too thick and their flowability is poor, the fibrous structure on the surface of the paper is easily pulled off due to the high viscosity of the ink. At the same time, even if the ink is too thick, uniform ink transfer and ink brushing cannot be achieved, and then ink build-up occurs. The phenomenon of ink accumulation caused the paste of lines and text parts in the printing layout. Therefore, if the ink amount is too large, the contact between the rubber roller and the chain iron roller is poor, and the position of the ink roller is unsuitable for adjustment, the thickness of the ink layer on the plate may be uneven. Thus, when the ink layer is too thick, the local layout is easy. Produce ink, paste ills. This should be adjusted by adjusting the ink's fluidity so that it maintains good transfer performance, and at the same time it should accurately control the amount of ink applied to the layout. In addition, the use of low-grade copperplate paper, whiteboard paper, and offset paper, which are easy to lose powder and lose hair, should be avoided. Gold and silver inks should be used to print off good process technologies from the source of quality to prevent the occurrence of adverse conditions.

To sum up, as long as we pay attention to the good technology and operation technology, carefully analyze the various quality problems in the printing process of gold and silver ink, continuously summarize the experience of the production process, and pay attention to taking the source of quality. Corresponding preventive measures can not only improve production efficiency, but also effectively avoid the appearance of such or such quality problems and ills, and improve the printing quality of gold and silver ink.

Source of information "Guangdong Packaging" 2005, 5
Fujian Putian Printing Factory Kang Qilai