How to calculate the amount of ink used?
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How do we calculate the amount of ink to be prepared in actual production? If the amount of preparation is too large, a large amount of waste ink will often remain after production, which is a waste of cost and an increase in waste ink inventory. If the budget is too small, the employees have to re-form, or even wait for the machine to stop, which will affect the production schedule. However, after many discussions and experiments, I found an accurate calculation method, which is now discussed with the industry.
First, we need to know what are the important factors that affect the amount of ink used. Basically, the amount of ink used is affected by several factors:
Minimum amount of ink on the press
When the ink is placed in the press, not all of the ink will be transferred to the paper. The ink will pass through many different rollers, be dispersed and transferred, and finally printed on the paper. Therefore, some are not used for printing. And the loss on the printing machine, covering the roller. In addition, the ink fountain should also reserve a certain amount of ink to stabilize the ink supply, so the ink on the drum and the ink fountain should be calculated within the usage. This amount can be understood as the printing machine. At least the amount of ink to be printed. Pay special attention to the printing of different brands and models, the minimum amount of ink will be different. Of course, the more the number of printing, the less the amount of ink on the press will become irrelevant.
Printing 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 spot color area of the print is used to calculate the amount of ink. If the pattern of the printed area is relatively regular, it is of course easy to calculate the area using different mathematical formulas of mathematics. Otherwise, it can be calculated by the following method:
1) First copy the pattern on the copy paper;
2) Then cut the pattern out of the copy paper;
3) Put the cut pattern on the scale to calculate the weight;
4) Cut the blank copy paper into 10cmx10cm 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
Number of prints
The amount of printed matter is most directly related to the amount of ink used. The more the number of prints, the more the ink usage will increase.
Ink loss rate
In general, the printing process, in addition to some of the ink will be lost on the drum, and some will be lost when the machine head is used for test printing. In addition, because the ink agitation rate can also be used to adjust the error in calculating the amount of ink, the operator can also decide whether to evaluate this.
Printing ink thickness
The thickness of the printed spot color ink does not directly represent the printing density, so it cannot be calculated using the general densitometer Densitometer. Since the thickness of the ink is relatively thin, it can be calculated by an indirect method using an ink qualifier or an inflator when the density cannot be measured by a densitometer and a ruler. Using these devices to calculate the thickness of the spot color ink is very knowledgeable, and the author will discuss it with the reader in the future.
The thicker the spot color ink, the more the ink will be used. Therefore, the printing thickness of the ink should be determined before printing to calculate the amount of ink. The author also advises readers here, do not reduce the thickness of the ink in order to save ink usage, because some colors can be printed at a certain thickness, and the ink is too thick, which will also cause other printing problems.
Specific gravity
The specific gravity of the ink is the weight of the ink per cubic centimeter. This parameter can also be calculated using an ink qualifier or an inflator.
Now we can start discussing how to calculate the amount of ink used. The first thing to know is the basic ink usage for each print. By using the printing area of the spot color pattern and the thickness of the ink, the ink volume of a printed matter can be known, and then the specific gravity of the ink can be used to convert the volume amount into a weight, thereby calculating the ink amount of a printed matter. Readers can also refer to the following formula:
A print ink dosage (g) = printing area X ink thickness X ink specific gravity
After calculating the ink usage of a print, the ink usage of the entire print order can be calculated, and then the ink loss rate and the minimum ink usage of the printer can be used to calculate the ink usage during production.
Production ink consumption = one printing ink consumption X loss rate X printing quantity + minimum ink dosage.