2 stable control of the printing press
The different requirements, sizes, characteristics, etc. of the branch office in Boh's decorating printed matter should be selected from different printing machines. However, no matter which type of printing machine is used, the printing machine in operation should be in a good state of operation. Therefore, the relevant data records of the printing press must be established. If the installation level error value of the machine
, The gap between the rollers, the diameter error of various ink rollers, and the adjustment between them. In addition, there are several regular inspections, adjustments, and maintenance records.
For example: domestic 08, 03, 05 offset printing machine printing 250 ~ 400g/m2 paper, three roller center distance adjustment data is: plate cylinder ~ blanket cylinder gap 3.95mm, blanket cylinder ~ impression cylinder shell gap 3.45mm.
For papers printed under 250g/m2, the central office adjustment of the three rollers is 3.85mm for the gap between the plate cylinder and the blanket cylinder, and 3.25mm for the gap between the blanket cylinder and the impression cylinder.
The level of installation of diagonal marks is checked with a horizontal detector and the longitudinal horizontal error is less than 0.08/1000, much like the horizontal error is less than 0.04/1000.
3 Environmental temperature and humidity control in the workshop
It is worth noting that changes in the ambient temperature and humidity of the workshop seriously affect the performance of ink and paper, and also affect the quality of printing. The influence of temperature on the flowability of ink and the effect of humidity on the stretchability of the paper are closely related. The high temperature of the ink has high fluidity, and the outlets are easy to expand. Conversely, the liquidity is small, the viscosity is increased, and it is not easy to set the ink down, causing problems such as paper pulling and peeling. Therefore, the ink's fluidity should be controlled at 30mm, and its adaptation temperature is about 20-30 degrees Celsius, the humidity is unstable, the ink fastness and paper absorption and distribution of water is not easy to stabilize, the paper is significantly stretched and affect the overprint accuracy, generally It should be kept at a humidity of 60%-75%. To ensure the quality of packaging and decorating printed matter, we must test and control the temperature and humidity of the printing shop, maintain a constant temperature and humidity, and adapt it to the printing requirements.
4, stable operation of process control
Packaging and decorating printing requires good reproducibility and repeatability, and a set of procedures and procedures must be established. Operators must not be allowed to do whatever they like. For example, in the color sequence, the process flow card must make a clear color sequence. The order of the color sequence, because the current offset printing method has two kinds of dry printing and wet printing, will affect the color effect of the printing product, that is, the color effect will change differently. The influence of the printing color sequence on the color can be calculated by the formula for the rate of overlapping printing.
Overprinting rate: For example, in the case of a certain packaged printed matter under the same conditions, the replacement of the color sequence is different. The measured results are shown in Table 3.
Another example is that in the operation, the "Sanping, Xiaoxiao" and "Qinqin" operating methods are strictly followed. Printing pressure data in process operations should also be different depending on the machine, paper, etc. Generally, the printing pressure of the imported offset press is 0.08-0.10mm; the printing pressure of the domestic offset press is 0.15-0.25mm, so the printing effect is relatively good.
The different requirements, sizes, characteristics, etc. of the branch office in Boh's decorating printed matter should be selected from different printing machines. However, no matter which type of printing machine is used, the printing machine in operation should be in a good state of operation. Therefore, the relevant data records of the printing press must be established. If the installation level error value of the machine
, The gap between the rollers, the diameter error of various ink rollers, and the adjustment between them. In addition, there are several regular inspections, adjustments, and maintenance records.
For example: domestic 08, 03, 05 offset printing machine printing 250 ~ 400g/m2 paper, three roller center distance adjustment data is: plate cylinder ~ blanket cylinder gap 3.95mm, blanket cylinder ~ impression cylinder shell gap 3.45mm.
For papers printed under 250g/m2, the central office adjustment of the three rollers is 3.85mm for the gap between the plate cylinder and the blanket cylinder, and 3.25mm for the gap between the blanket cylinder and the impression cylinder.
The level of installation of diagonal marks is checked with a horizontal detector and the longitudinal horizontal error is less than 0.08/1000, much like the horizontal error is less than 0.04/1000.
3 Environmental temperature and humidity control in the workshop
It is worth noting that changes in the ambient temperature and humidity of the workshop seriously affect the performance of ink and paper, and also affect the quality of printing. The influence of temperature on the flowability of ink and the effect of humidity on the stretchability of the paper are closely related. The high temperature of the ink has high fluidity, and the outlets are easy to expand. Conversely, the liquidity is small, the viscosity is increased, and it is not easy to set the ink down, causing problems such as paper pulling and peeling. Therefore, the ink's fluidity should be controlled at 30mm, and its adaptation temperature is about 20-30 degrees Celsius, the humidity is unstable, the ink fastness and paper absorption and distribution of water is not easy to stabilize, the paper is significantly stretched and affect the overprint accuracy, generally It should be kept at a humidity of 60%-75%. To ensure the quality of packaging and decorating printed matter, we must test and control the temperature and humidity of the printing shop, maintain a constant temperature and humidity, and adapt it to the printing requirements.
4, stable operation of process control
Packaging and decorating printing requires good reproducibility and repeatability, and a set of procedures and procedures must be established. Operators must not be allowed to do whatever they like. For example, in the color sequence, the process flow card must make a clear color sequence. The order of the color sequence, because the current offset printing method has two kinds of dry printing and wet printing, will affect the color effect of the printing product, that is, the color effect will change differently. The influence of the printing color sequence on the color can be calculated by the formula for the rate of overlapping printing.
Overprinting rate: For example, in the case of a certain packaged printed matter under the same conditions, the replacement of the color sequence is different. The measured results are shown in Table 3.
Another example is that in the operation, the "Sanping, Xiaoxiao" and "Qinqin" operating methods are strictly followed. Printing pressure data in process operations should also be different depending on the machine, paper, etc. Generally, the printing pressure of the imported offset press is 0.08-0.10mm; the printing pressure of the domestic offset press is 0.15-0.25mm, so the printing effect is relatively good.
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