Layout cleaning refers to the process of scrubbing the layout after positioning and positioning. The end mill is also referred to as the open version. Its purpose is mainly to improve the activity of the layout, enhance the water absorption of the blank parts and the ink receptivity of the graphic part. The method of scrubbing is to wipe off the protective film on the plate surface with a damp cloth first, and then draw the graphic ink on the plate surface with gasoline, and if the plate surface still remains and can not wash away the dirty spots, the dirt removing agent can be used to dissolve and remove.
One, dampening ink
1, dampening
For lithographic proofing, the dampening must be performed before the printing on the surface of the plate, so that the blank part of the printing plate is uniformly adsorbed with a layer of fountain solution, and the plate surface is always maintained in this wetting state during the proofing process so as to prevent the occurrence of ink absorption. phenomenon.
(1) The way of dampening
The proofing dampening method includes the automatic dampening of the water supply device, the manual water dampening version, and the low temperature version of the condensing dampening version. Proofing can be applied flexibly according to the specific circumstances. In general, the automatic dampening of the water proofing device is mainly used in the proofing technique. The manual dampening dampening version is supplemented, and the dampening dampening version of the low-temperature version stabilizes the dampening status, reducing the evaporation of the dampening fluid.
When the dampening is started, the face milling machine can use the water delivery device for multiple times of water and hand rubbing to accelerate the dampening speed and improve the wetness of the plate.
(2) Inspection of dampening water volume
The methods for checking the size of layout water mainly include visual inspection and instrument detection. The visual observation method is to judge the size of the layout water by the operator by observing the strength of the reflected light of the layout. The reflected light of the layout is stronger and the gloss is larger, which indicates that the layout water is larger; on the contrary, the reflected light of the layout is weak, and the gloss is relatively low. When the layout is dark, it indicates that the amount of water is small. The observation method is simple and easy, but the accuracy is poor. It is influenced greatly by factors such as the angle of observation, the thickness of the layout sand, and the size of the layout text, and the experience and technical requirements of the inspectors are relatively high.
Under normal circumstances, the surface is darkened, there is no obvious reflection of light and watermark, and the amount of water can be controlled by using the standard of dirty.
The instrument detection method is to detect the amount of reflected light on the plate surface, and the face milling machine converts this reflected light quantity into a water film thickness value. The accuracy of this detection method is high, but the monitoring equipment is more expensive and is rarely used at present.
(3) Factors Affecting the Size of Dampening Water
The following factors affect the size of layout water:
1 proofing temperature, when the proofing temperature is high, the amount of water is large.
2 layout sand fineness. Large amount of water is used when the layout is rough.
3 ink thickness. When the ink layer is thick, it should increase the amount of water.
4 ink performance. When the ink is easy to emulsify, reduce the amount of water.
5 fountain solution performance. Face Milling When the surface tension of the fountain solution is small, reduce the amount of water.
One, dampening ink
1, dampening
For lithographic proofing, the dampening must be performed before the printing on the surface of the plate, so that the blank part of the printing plate is uniformly adsorbed with a layer of fountain solution, and the plate surface is always maintained in this wetting state during the proofing process so as to prevent the occurrence of ink absorption. phenomenon.
(1) The way of dampening
The proofing dampening method includes the automatic dampening of the water supply device, the manual water dampening version, and the low temperature version of the condensing dampening version. Proofing can be applied flexibly according to the specific circumstances. In general, the automatic dampening of the water proofing device is mainly used in the proofing technique. The manual dampening dampening version is supplemented, and the dampening dampening version of the low-temperature version stabilizes the dampening status, reducing the evaporation of the dampening fluid.
When the dampening is started, the face milling machine can use the water delivery device for multiple times of water and hand rubbing to accelerate the dampening speed and improve the wetness of the plate.
(2) Inspection of dampening water volume
The methods for checking the size of layout water mainly include visual inspection and instrument detection. The visual observation method is to judge the size of the layout water by the operator by observing the strength of the reflected light of the layout. The reflected light of the layout is stronger and the gloss is larger, which indicates that the layout water is larger; on the contrary, the reflected light of the layout is weak, and the gloss is relatively low. When the layout is dark, it indicates that the amount of water is small. The observation method is simple and easy, but the accuracy is poor. It is influenced greatly by factors such as the angle of observation, the thickness of the layout sand, and the size of the layout text, and the experience and technical requirements of the inspectors are relatively high.
Under normal circumstances, the surface is darkened, there is no obvious reflection of light and watermark, and the amount of water can be controlled by using the standard of dirty.
The instrument detection method is to detect the amount of reflected light on the plate surface, and the face milling machine converts this reflected light quantity into a water film thickness value. The accuracy of this detection method is high, but the monitoring equipment is more expensive and is rarely used at present.
(3) Factors Affecting the Size of Dampening Water
The following factors affect the size of layout water:
1 proofing temperature, when the proofing temperature is high, the amount of water is large.
2 layout sand fineness. Large amount of water is used when the layout is rough.
3 ink thickness. When the ink layer is thick, it should increase the amount of water.
4 ink performance. When the ink is easy to emulsify, reduce the amount of water.
5 fountain solution performance. Face Milling When the surface tension of the fountain solution is small, reduce the amount of water.
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