1 Introduction
Ink is a colorant for printing and is the main raw material for printing. Ink has a great relationship with the quality of the printing, especially when the ink properties are not suitable for printing, it will cause a series of failures on the process, seriously affecting the normal production and the quality of the product. The printing operator must change the ink. Some of the properties are suitable for printing needs, but some process failures are not only caused by the ink, but also related to other factors, so the printing operator must carefully analyze and properly handle. Muwen argued that the ink was causing problems in the printing process and how to handle it, hoping to help.
2. Ink pile
Phenomenon and reason: In the printing process, the ink from the ink fountain cannot be balanced and transferred to the paper through the ink roller, printing plate and blanket, but piled up and lost good transmission. This situation occurs, in addition to the pressure of the machine is not suitable and the rubber blanket and other factors, the common reasons are as follows:
1> The viscosity of the binder is not suitable, and there is not enough adhesion to transfer the pigment, so that some of the pigment particles are accumulated on the ink roller, printing plate and blanket.
2) The thicker or specific gravity of the pigment particles, the worse the transfer ability of the binder material, and the less ability to transfer it, so that the ink deposits on the ink roller, printing plate, and blanket. This situation is common in the printing of yellow ink, because the proportion of yellow pigment in the ink is larger, which can account for 75%, the heavier the pigment, the more important the connection force of the binder.
3) The amount of oil in the ink is too small and the pigment particles do not have enough binder to accumulate.
4) The viscosity of the ink is too high or too hard, the fluidity is small, and the ink in the printing ink fountain is not easy to get down onto the ink roller. If the adsorption and adhesion between the inks is greater than the printing plate, blanket and the adsorption force of the paper to the ink, then Ink still accumulates on the rollers, plates, and blankets.
5) Adding too much dry oil in the ink will make the ink dry on the ink roller or make the ink sticky. Especially in the summer or when the down time is too long, once the ink is dry on the ink roller, it will lose its transfer performance. The ink is deposited on the ink roller.
6) The paper texture is evacuated or "bleached", resulting in the mixing of paper and chalk into the ink, and also the stacking and stacking of blankets.
Approach:
1) Due to the poor viscosity of the binder or the coarseness of the pigment particles, the specific gravity can be increased. Adding No. 0 varnish or resin can increase the viscosity and improve the transfer performance.
2) As the viscosity of the ink is too high, too hard, the texture of the paper is loose, de-powdering, or the oil content is insufficient, the No. 6 varnish, Cambon, Jilin Lin, Weili oil, etc. can be used to change the ink viscosity and increase the wettability. .
3) Reduce the amount of dry oil (add new ink) or add some non-dry accessories.
4) Ink pigment particles are coarse, with a large specific gravity, and it is still not possible to increase the viscosity. The ink can be used after being rolled in an ink mill.
5) If some of the properties are changed, the phenomenon of stacking cannot be completely solved. It can be combined with multiple washing rollers, printing plates, and blankets.
(to be continued)
Ink is a colorant for printing and is the main raw material for printing. Ink has a great relationship with the quality of the printing, especially when the ink properties are not suitable for printing, it will cause a series of failures on the process, seriously affecting the normal production and the quality of the product. The printing operator must change the ink. Some of the properties are suitable for printing needs, but some process failures are not only caused by the ink, but also related to other factors, so the printing operator must carefully analyze and properly handle. Muwen argued that the ink was causing problems in the printing process and how to handle it, hoping to help.
2. Ink pile
Phenomenon and reason: In the printing process, the ink from the ink fountain cannot be balanced and transferred to the paper through the ink roller, printing plate and blanket, but piled up and lost good transmission. This situation occurs, in addition to the pressure of the machine is not suitable and the rubber blanket and other factors, the common reasons are as follows:
1> The viscosity of the binder is not suitable, and there is not enough adhesion to transfer the pigment, so that some of the pigment particles are accumulated on the ink roller, printing plate and blanket.
2) The thicker or specific gravity of the pigment particles, the worse the transfer ability of the binder material, and the less ability to transfer it, so that the ink deposits on the ink roller, printing plate, and blanket. This situation is common in the printing of yellow ink, because the proportion of yellow pigment in the ink is larger, which can account for 75%, the heavier the pigment, the more important the connection force of the binder.
3) The amount of oil in the ink is too small and the pigment particles do not have enough binder to accumulate.
4) The viscosity of the ink is too high or too hard, the fluidity is small, and the ink in the printing ink fountain is not easy to get down onto the ink roller. If the adsorption and adhesion between the inks is greater than the printing plate, blanket and the adsorption force of the paper to the ink, then Ink still accumulates on the rollers, plates, and blankets.
5) Adding too much dry oil in the ink will make the ink dry on the ink roller or make the ink sticky. Especially in the summer or when the down time is too long, once the ink is dry on the ink roller, it will lose its transfer performance. The ink is deposited on the ink roller.
6) The paper texture is evacuated or "bleached", resulting in the mixing of paper and chalk into the ink, and also the stacking and stacking of blankets.
Approach:
1) Due to the poor viscosity of the binder or the coarseness of the pigment particles, the specific gravity can be increased. Adding No. 0 varnish or resin can increase the viscosity and improve the transfer performance.
2) As the viscosity of the ink is too high, too hard, the texture of the paper is loose, de-powdering, or the oil content is insufficient, the No. 6 varnish, Cambon, Jilin Lin, Weili oil, etc. can be used to change the ink viscosity and increase the wettability. .
3) Reduce the amount of dry oil (add new ink) or add some non-dry accessories.
4) Ink pigment particles are coarse, with a large specific gravity, and it is still not possible to increase the viscosity. The ink can be used after being rolled in an ink mill.
5) If some of the properties are changed, the phenomenon of stacking cannot be completely solved. It can be combined with multiple washing rollers, printing plates, and blankets.
(to be continued)
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