(6) Preparing testready paper (makeready book)
Patterning paper is just a stack of paper, including some waste paper (previously printed) and some clean white paper. The ratio of clean white paper to waste paper is generally 1:5. First, the waste paper is cut to the same size as the clean white paper, and 10 clean white papers are inserted every 50 pieces of waste paper. The final number is about 1100. (Depending on the complexity of the debugging process, this number may also have Changed). Then, put them on the transfer table.
(7) The trial printing press operator can now conduct the first trial printing. The operation steps are as follows:
A. Clean the plate with water, remove the protective glue on the plate, and start the printer at a slow speed.
B. Start the wetting system and check if the surface of the printing plate is evenly wetted.
C. Set the ink roller to automatic mode.
D. Turn on the automatic paper feeding device, and the printing press presses and prints until the first print (printed on clean white paper) is obtained at the delivery end. Check if paper feeding, paper feeding, and delivery are appropriate.
E. Turn off the automatic paper feeding device (press machine automatically leaves the pressure) and stop supplying water to the plate.
(8) Inspection of test samples Samples of test samples are examined on a slightly inclined, flat-surfaced table, according to observation conditions of ANSI PH2.30-1989 standard - color prints, slides, and filmmaking (Photomechanical Reproductions) observation stands. The color temperature of the upper light source must be 5000K, and any visible surface (ie, "ambient environment") within the observation deck must be neutral gray (Munsell N/8), in the GATF SecondSight 14-color viewing conditions in the image Details of this aspect.
The examination of the test sample mainly includes the following points:
A. Check the position and registration of the image.
B. Check the quality of the printed matter.
C. Check the ink-water balance.
D. Check the color of the printed matter.
The inspection point of the first test sample is the position of the image, because the ink supply system and the wetting system have not yet reached the ink balance.
1, image registration and location check. The first step is to check the position of the image on the first test sample. If only the monochrome image is printed, there is no alignment problem between the image and the paper, as long as the position of the image on the paper is appropriate and not skewed. Yes. If the image is unfavorable with respect to the left and right sides, the position of the side gauge and the paper cassette can be adjusted; if it is necessary to move the image closer to or away from the mouth, the plate cylinder needs to be adjusted accordingly. In addition, since multi-color printing is generally performed, that is, a plurality of colors are printed on a sample of the printing sample, in addition to registering with the registration of the paper, mutual registration between the colors is also required.
When the first color is printed on the test sample, each color image printed thereafter must be registered with the first color image. In order to ensure image registration, the side gauges can no longer be adjusted. Therefore, if the color images are not parallel to each other, the position must be changed by moving the printing cylinder or twisting the printing plate. If the length of the image changes, it may be necessary to move the pad below the plate under the blanket so that the length of the image can be guaranteed.
2, check the quality of prints. It is impossible to obtain high-quality printed images on the previous test samples. There are two major quality defects on these test samples: First, the overall color is light (because the amount of ink supplied by the fountain solution is insufficient The second reason is that the overall color is too heavy (because the amount of ink is too large). In addition, there are some other failures, such as dirtiness and stencils in the halftone image, ink blemishes, print particles, paper sticking on the blanket, and excessive warpage of the paper when the paper is delivered. In the causes of these failures, all have one thing in common, which is caused by the imbalance of ink and wash. Therefore, the operator of the printing press must correctly determine the true cause of the failure. If it is due to the imbalance of the ink, the ink supply system and the wetting system should be adjusted accordingly, and the minimum level of ink and water balance should be achieved as much as possible. If the image does not transfer smoothly from the blanket, you must check whether the pressure between the blanket cylinder and the impression cylinder is appropriate, and if necessary, make adjustments.
3, check the print color. As long as the position of the image is appropriate and the print quality is acceptable, the printer operator then adjusts the ink supply system until the color of the print is satisfactory.
The printed matter must be observed under standard lighting conditions (5000K) and compared with the color proofs provided with the live parts. This has a certain guiding effect on the operator's adjustment of the ink supply system. The proofs should match the hue and gradation of the printing ink (if not matched, it would not be possible to obtain prints matching the proofs on the press).
When performing multi-color printing, there should be a color control strip on the job, such as a GATF six-color control strip printed along the trailing edge of the paper (in the cutting area). The printer operator uses a hand-held density meter or a scanning densitometer to measure the density of the three primary colors in the field. (It is possible to check the overprint performance of the ink of the latter color on the ink of the previous color by a two-color or three-color overprinting field). Many printing companies have established standard ink density values, such as yellow 0.95+0.05, magenta 1.30+0.05, cyan 1.30+0.05, and black 1.6+0.10 when printing on coated paper. (These values ​​are for reference only, not necessarily Available for all presses and all ink settings). The ink fountain is set according to the already established reference value. With the reflection densitometer, the ink can be adjusted more accurately with less paper. When computer-controlled scanning densitometers or plate scanners are used, because the instrument can display the relative ink demand on the surface of the paper, a satisfactory color can be obtained quickly.
Since the amount of ink required at different positions on the surface of the paper is also different, the ink fountain key must be set according to the amount of ink required. In other words, the operator of the printer must open the ink fountain key in the area where a large amount of ink is required. In the area with less demand for ink, the ink fountain key must be turned off. In a chart that reflects the amount of ink on the surface of the paper, there are some peaks and some valleys, where the peaks represent areas that require large amounts of ink, and the valleys represent areas with low demand for ink. Or simply do not need ink in the area (such as the paper cut part).
Patterning paper is just a stack of paper, including some waste paper (previously printed) and some clean white paper. The ratio of clean white paper to waste paper is generally 1:5. First, the waste paper is cut to the same size as the clean white paper, and 10 clean white papers are inserted every 50 pieces of waste paper. The final number is about 1100. (Depending on the complexity of the debugging process, this number may also have Changed). Then, put them on the transfer table.
(7) The trial printing press operator can now conduct the first trial printing. The operation steps are as follows:
A. Clean the plate with water, remove the protective glue on the plate, and start the printer at a slow speed.
B. Start the wetting system and check if the surface of the printing plate is evenly wetted.
C. Set the ink roller to automatic mode.
D. Turn on the automatic paper feeding device, and the printing press presses and prints until the first print (printed on clean white paper) is obtained at the delivery end. Check if paper feeding, paper feeding, and delivery are appropriate.
E. Turn off the automatic paper feeding device (press machine automatically leaves the pressure) and stop supplying water to the plate.
(8) Inspection of test samples Samples of test samples are examined on a slightly inclined, flat-surfaced table, according to observation conditions of ANSI PH2.30-1989 standard - color prints, slides, and filmmaking (Photomechanical Reproductions) observation stands. The color temperature of the upper light source must be 5000K, and any visible surface (ie, "ambient environment") within the observation deck must be neutral gray (Munsell N/8), in the GATF SecondSight 14-color viewing conditions in the image Details of this aspect.
The examination of the test sample mainly includes the following points:
A. Check the position and registration of the image.
B. Check the quality of the printed matter.
C. Check the ink-water balance.
D. Check the color of the printed matter.
The inspection point of the first test sample is the position of the image, because the ink supply system and the wetting system have not yet reached the ink balance.
1, image registration and location check. The first step is to check the position of the image on the first test sample. If only the monochrome image is printed, there is no alignment problem between the image and the paper, as long as the position of the image on the paper is appropriate and not skewed. Yes. If the image is unfavorable with respect to the left and right sides, the position of the side gauge and the paper cassette can be adjusted; if it is necessary to move the image closer to or away from the mouth, the plate cylinder needs to be adjusted accordingly. In addition, since multi-color printing is generally performed, that is, a plurality of colors are printed on a sample of the printing sample, in addition to registering with the registration of the paper, mutual registration between the colors is also required.
When the first color is printed on the test sample, each color image printed thereafter must be registered with the first color image. In order to ensure image registration, the side gauges can no longer be adjusted. Therefore, if the color images are not parallel to each other, the position must be changed by moving the printing cylinder or twisting the printing plate. If the length of the image changes, it may be necessary to move the pad below the plate under the blanket so that the length of the image can be guaranteed.
2, check the quality of prints. It is impossible to obtain high-quality printed images on the previous test samples. There are two major quality defects on these test samples: First, the overall color is light (because the amount of ink supplied by the fountain solution is insufficient The second reason is that the overall color is too heavy (because the amount of ink is too large). In addition, there are some other failures, such as dirtiness and stencils in the halftone image, ink blemishes, print particles, paper sticking on the blanket, and excessive warpage of the paper when the paper is delivered. In the causes of these failures, all have one thing in common, which is caused by the imbalance of ink and wash. Therefore, the operator of the printing press must correctly determine the true cause of the failure. If it is due to the imbalance of the ink, the ink supply system and the wetting system should be adjusted accordingly, and the minimum level of ink and water balance should be achieved as much as possible. If the image does not transfer smoothly from the blanket, you must check whether the pressure between the blanket cylinder and the impression cylinder is appropriate, and if necessary, make adjustments.
3, check the print color. As long as the position of the image is appropriate and the print quality is acceptable, the printer operator then adjusts the ink supply system until the color of the print is satisfactory.
The printed matter must be observed under standard lighting conditions (5000K) and compared with the color proofs provided with the live parts. This has a certain guiding effect on the operator's adjustment of the ink supply system. The proofs should match the hue and gradation of the printing ink (if not matched, it would not be possible to obtain prints matching the proofs on the press).
When performing multi-color printing, there should be a color control strip on the job, such as a GATF six-color control strip printed along the trailing edge of the paper (in the cutting area). The printer operator uses a hand-held density meter or a scanning densitometer to measure the density of the three primary colors in the field. (It is possible to check the overprint performance of the ink of the latter color on the ink of the previous color by a two-color or three-color overprinting field). Many printing companies have established standard ink density values, such as yellow 0.95+0.05, magenta 1.30+0.05, cyan 1.30+0.05, and black 1.6+0.10 when printing on coated paper. (These values ​​are for reference only, not necessarily Available for all presses and all ink settings). The ink fountain is set according to the already established reference value. With the reflection densitometer, the ink can be adjusted more accurately with less paper. When computer-controlled scanning densitometers or plate scanners are used, because the instrument can display the relative ink demand on the surface of the paper, a satisfactory color can be obtained quickly.
Since the amount of ink required at different positions on the surface of the paper is also different, the ink fountain key must be set according to the amount of ink required. In other words, the operator of the printer must open the ink fountain key in the area where a large amount of ink is required. In the area with less demand for ink, the ink fountain key must be turned off. In a chart that reflects the amount of ink on the surface of the paper, there are some peaks and some valleys, where the peaks represent areas that require large amounts of ink, and the valleys represent areas with low demand for ink. Or simply do not need ink in the area (such as the paper cut part).
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