Editor's note: A large part of the quality of printed matter lies in the amount of ink: if there is too much ink, there will be stencils, sticky or irrelevant effects; if the amount of ink is too small, problems such as image color cast, field whitening, and text break strokes will occur. Therefore, the moderate amount of ink, quantitative transfer of ink has become another indispensable part of the quality of printing inks!
In the previous editions of this website, we talked about the control of inks in the printing process, such as ink drying, viscosity, blending, and ink control problems, which are closely related to the quality of printing. Therefore, we will continue to talk about the control of printing ink volume in this issue.
★ Influencing factors of ink volume
First of all, we must know that there are Any important factors can affect the amount of ink used. Basically, ink usage will be affected by the following factors:
(1) The minimum amount of ink on the press When the ink is placed on the press, not all of it will be transferred to the paper. The ink passes through many different rollers and is dispersed and transferred onto it, and finally printed on paper. So, some of them are not used for printing and they are lost on the press and cover the rollers. In addition, the ink fountain must reserve a certain amount of ink to stabilize the ink supply. Therefore, the ink on the roller and the ink fountain should be calculated within the usage. This amount can be understood as the minimum amount of ink on the press. Pay special attention to different brands and models of presses, the minimum amount of ink will be different. Of course, the greater the number of prints, the least amount of ink on the press will become irrelevant.
(2) Print Area The spot color area of ​​a print is proportional to the amount of ink. The larger the spot color area, the more ink is used. Therefore, the area of ​​printed spot color will be used to calculate the amount of ink. If the pattern of the printing area is relatively regular, it is of course easy to calculate the area using different mathematical formulae of the mathematics. Otherwise, the following method can be used to calculate:
1) First copy the pattern on copy paper;
2) Then cut out the pattern from copy paper;
3) Put the cut out pattern on the scale to calculate the weight;
4) Cut the blank copy paper into 10cm x 10cm squares;
5) Place a 10cm x 10cm (100cm2) square on the scale to calculate the weight;
6) The pattern area can be calculated by the following formula:
Pattern area cm2=(100x pattern weight)/square weight
(3) Quantity of printed matter The quantity of printed matter is most directly related to the amount of ink used. The greater the number of prints, the greater the amount of ink used.
(4) Ink loss rate In the general printing process, some inks will be lost on the roller, and some will be lost when the head is used for test printing. In addition, since the ink loss rate can also be used as an error to adjust the ink amount calculation, the operator can also decide whether or not to evaluate it.
(5) Print ink thickness The thickness of the printed spot ink does not directly represent the printing density. Therefore, it cannot be calculated using a densitometer. Since the thickness of the ink is relatively thin, it can be calculated by means of an ink qualitative analyzer or an ink-dispensing machine using an indirect method when the thickness cannot be measured with a density meter or a ruler. Using these devices to calculate the thickness of spot color inks, I will discuss with readers in the future.
The thicker the spot color ink, the more ink will be used. Therefore, the printing thickness of the ink must be determined before printing in order to calculate the amount of ink. I also advise the readers here that you should not reduce the thickness of the ink in order to save the amount of ink, because some colors must be printed at a certain thickness, and if the ink is too thick, there will be other printing problems.
(6) Specific gravity
The proportion of ink is the weight of ink per cubic centimeter. This parameter can also be calculated using an ink meter or ink distributor.
Normal > What factors determine the amount of ink in screen printing?
Normal > The determinants of ink volume in screen printing
Normal > Flexographic Influencing Factors Analysis
Normal > Effect of Ink Volume on Density Change of Offset Prints
★Calculation of ink volume
After understanding the restraining factors of ink usage, now
A piece of print ink usage (g) = print area x ink thickness x ink specific gravity
After calculating the amount of ink for a print, you can calculate the amount of ink for the entire print order, and then add the ink loss rate and the minimum amount of ink on the press to calculate the amount of ink used during production.
Production ink usage = one printing ink usage x loss rate x printing quantity + minimum ink usage
The reader can use the above formula to try to calculate the amount of ink used in the printing process and verify that the theory is helpful for production.
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