Abstract: The author analyzes the ink-induced failures in the printing process and provides corresponding solutions.
Abstract; The author analyses the breakdown caused in printing process and gives the correlation resolution.
Ink is a colorant for printing and is the main raw material for printing. Ink has a great relationship with the quality of printing, especially when the ink properties are not suitable for printing, it will cause a series of failures in the process, seriously affecting the normal production and the quality of the product. The printer must change the ink. Certain properties are suitable for printing needs, but some process failures are not only caused by ink, but also related to other factors, so the printing operator must carefully analyze and properly handle. This article first discusses the problems caused by the ink during the printing process and how to deal with it. Hopefully, it will help.
1. Ink stacking phenomenon and causes: In the printing process, the ink from the ink fountain can not be balanced through the ink roller, printing plate and blanket transfer to the paper, but pile up, lost a good transmission. This happens, in addition to the pressure of the machine is not appropriate 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 insufficient adhesion to transfer the pigment, so that some of the pigment particles are accumulated on the ink roller, plate, and blanket.
(2) The thicker or specific gravity of the pigment particles, the poorer the transfer ability of the binder, and the less able the ability to transfer them, so that the ink deposits on the ink roller, plate, and blanket. This situation is common when printing yellow ink. Due to the large proportion of yellow pigment in the ink, it can account for 75%. The heavier the pigment, the more important the connection force of the binder.
Yellow ink printing is prone to stacking (3) The ink contains too little oil and the pigment particles do not have enough binder to accumulate.
(4) The viscosity of the ink is too high or too hard, and its fluidity is small. The ink in the printing ink fountain is not easy to reach the ink roller. If the ink adhesion force is greater than the printing plate, blanket, and paper on the ink adsorption force, The ink will still accumulate 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 transmission performance. The ink from the ink fountain accumulates on the ink roller.
(6) The paper texture is loose or "powder removal", resulting in the mixing of paper wool and silt into the ink, as well as stacking and stacking blankets.
Approach:
(1) Due to the poor adhesion of the binder or the coarseness and specific gravity of the pigment particles, an additive varnish or oil can be added to increase the viscosity and transfer performance.
(2) As the viscosity of the ink is too high and too hard, the texture of the paper is loose, de-powdering, or the oil content is insufficient, and No. 6 varnish, Cambon, Vaseline, Willy oil, etc. can be used to change the ink viscosity and increase the wetting property.
(3) reduce the amount of dry oil (plus 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 rolled before being used in the ink mill.
(5) If certain properties are changed, the phenomenon of stacking ink cannot be thoroughly solved. It can be processed in combination with multiple washing rollers, printing plates, and blankets.
2. The phenomenon of flower board and its causes: The flower pattern is gradually getting smaller and falling off, and the printing plate loses its good fat-sensing ability, so that the level of the printed matter is reduced and the ink is lightened. There are many reasons for floral patterns. For example, the pressure of rollers, water rollers, and ink rollers is too high. The water of the bucket is too large or the water is too large. There are too many paper sands or the blanket is too hard. Common patterns are caused by ink. The following reasons: (to be continued)
Abstract; The author analyses the breakdown caused in printing process and gives the correlation resolution.
Ink is a colorant for printing and is the main raw material for printing. Ink has a great relationship with the quality of printing, especially when the ink properties are not suitable for printing, it will cause a series of failures in the process, seriously affecting the normal production and the quality of the product. The printer must change the ink. Certain properties are suitable for printing needs, but some process failures are not only caused by ink, but also related to other factors, so the printing operator must carefully analyze and properly handle. This article first discusses the problems caused by the ink during the printing process and how to deal with it. Hopefully, it will help.
1. Ink stacking phenomenon and causes: In the printing process, the ink from the ink fountain can not be balanced through the ink roller, printing plate and blanket transfer to the paper, but pile up, lost a good transmission. This happens, in addition to the pressure of the machine is not appropriate 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 insufficient adhesion to transfer the pigment, so that some of the pigment particles are accumulated on the ink roller, plate, and blanket.
(2) The thicker or specific gravity of the pigment particles, the poorer the transfer ability of the binder, and the less able the ability to transfer them, so that the ink deposits on the ink roller, plate, and blanket. This situation is common when printing yellow ink. Due to the large proportion of yellow pigment in the ink, it can account for 75%. The heavier the pigment, the more important the connection force of the binder.
Yellow ink printing is prone to stacking (3) The ink contains too little oil and the pigment particles do not have enough binder to accumulate.
(4) The viscosity of the ink is too high or too hard, and its fluidity is small. The ink in the printing ink fountain is not easy to reach the ink roller. If the ink adhesion force is greater than the printing plate, blanket, and paper on the ink adsorption force, The ink will still accumulate 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 transmission performance. The ink from the ink fountain accumulates on the ink roller.
(6) The paper texture is loose or "powder removal", resulting in the mixing of paper wool and silt into the ink, as well as stacking and stacking blankets.
Approach:
(1) Due to the poor adhesion of the binder or the coarseness and specific gravity of the pigment particles, an additive varnish or oil can be added to increase the viscosity and transfer performance.
(2) As the viscosity of the ink is too high and too hard, the texture of the paper is loose, de-powdering, or the oil content is insufficient, and No. 6 varnish, Cambon, Vaseline, Willy oil, etc. can be used to change the ink viscosity and increase the wetting property.
(3) reduce the amount of dry oil (plus 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 rolled before being used in the ink mill.
(5) If certain properties are changed, the phenomenon of stacking ink cannot be thoroughly solved. It can be processed in combination with multiple washing rollers, printing plates, and blankets.
2. The phenomenon of flower board and its causes: The flower pattern is gradually getting smaller and falling off, and the printing plate loses its good fat-sensing ability, so that the level of the printed matter is reduced and the ink is lightened. There are many reasons for floral patterns. For example, the pressure of rollers, water rollers, and ink rollers is too high. The water of the bucket is too large or the water is too large. There are too many paper sands or the blanket is too hard. Common patterns are caused by ink. The following reasons: (to be continued)