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The most effective method of spot-color ink usage control

  Date:2014-11-05  Views:129

When carrying out printing work, spot-color ink is to ensure consistent color prints of many important materials; there are security patch applied to the spot color ink security printing; moreover, there is a map type printing will use spot color printing technology. . 

However, spot-color ink used four-color ink compared to the amount is too small, the ink can not be large-scale production plant, resulting in high cost of spot color inks. Therefore, most spot-color inks are by printing its own deployment. Since the spot color ink with less time and can not be less than the actual amount of color, easy leftover ink, the ink will affect the performance of long-term placement. For printing companies, the remaining ink is not a small problem, it will greatly affect the cost of production, can not be ignored. 

       To address this issue, the fundamental solution is to accurately calculate the amount of ink to print in. Some ink manufacturers or supply business to provide users with a rough calculation method of ink usage, such as the Netherlands VANSONINK ink, British Gao ink companies have put forward their own ink calculation method; domestic counterparts in practice also summarize some methods . Hang loose method for calculating the amount of your printing inks (under the offset mode, press work, to be able to print acceptable quality print date). 

Determine how much the amount of ink, the first to analyze the impact of various factors and accounting methods the amount of printing inks. 

Printing area 

Printing area and determine the volume of the ink layer thickness, and thus determines the amount of ink. The size of the printed area of the original decision by the graphic, but each spot color to determine the actual graphic area to be covered is not an easy task. For graphic rules and dot percentage known originals (flat screen), you can easily come to the actual printing area, but for graphic irregular and abundant levels of the original image, and how should we calculate the actual printing area it? Here are a calculation method - digital image processing method, the steps are as follows: 

For a given area of the original image is digitized and stored in the acquisition, analog graphics plane, after the input device into a digital image processing are stored in the computer; original digital image can be removed from this step; 

Collection of original information is processed, namely to find the manuscript to meet the requirements of all the pixels, and do add and treatment; 

C. Output Operational results plus and value, which is the actual need to print dot area. 

Some printers use of an alternative method, but also more practical, specific time: copying the pattern to be printed after weighing, but also cut a piece of copy paper weighing 250px * 250px, it can be calculated according to the following manner Graphic area: 

Graphic area = (100 * pattern photocopy weight) / square paper weight 

1. The layer thickness 

One decisive factor is the amount of ink layer thickness. Since the printing conditions, substrate conditions, the complexity and variability, leading to uncertainty and ink film thickness non-uniformity. With the continuous development to offset high precision and high reliability direction, when the printed material quality and security, the printing process ink film thickness maximum error does not exceed 0.058μm, impact on the total amount of ink is relatively small, it is generally the case , we can think of the printing environment is based on the ink film thickness uniform. 

Layer thickness ranges are not random, in general, the particular printing environment (printing machinery, printing materials, inks and pressroom temperature, humidity, etc.) there is an optimum layer thickness, on the one hand to make ink full, field density and print contrast value reaches maximum; on the other hand make the minimum dot gain values to achieve optimal levels of reduction, stable printing quality. 

Layer thickness can be measured in two ways: one is focused on the more common method of comparing a difference in weight before and after printing substrate sheet, and then divided by the module area. 

2. Ink proportion 

I.e., the density of the ink, often g / cm3 units. This parameter can be used ink ink adaptive computing device or exhibition, some of the ink to provide this parameter. 

3. The number of copies 

That is the total amount of printed materials need to print. 

4. The substrate characteristics 

When considering only the paper substrate, the coating can be broadly divided into two types of paper and uncoated paper. Paper itself ink absorbency, surface smoothness and strength of the structure, will affect the amount of ink. However, the specific impact of these factors is difficult to accurately determine the amount of ink, suitable for qualitative analysis, or in addition to the other factors are given 

5. The printing device characteristics 

The amount of ink for the printing device characteristics impact is mainly reflected in two aspects: First printing pressure and speed increases affect the value of the layer thickness and outlets; on the other hand is the least amount of ink on the printing press, ie the actual printing process, To override the ink printing ink road surface all machinery needed, coupled to stabilize the amount of ink inside the ink fountain set aside a certain amount. 

6. printing process, in addition to the loss on the part of the ink will be inking process and the printing plate and blanket cylinder, and some loss of ink will be printed out in the trial when, so this factor should also consider the impact on the overall amount of ink. Quantitative analysis of the loss amount can be made based on the actual situation was printed 

7. stored ink 

Due to various unknown factors, general printing will be more with some common spot color ink, stored up. This parameter is determined by the printing himself. 

Analysis shows that the two main factors for the printing area and the layer thickness, quantitative analysis needed to determine its precise value, but also to verify the results, if necessary; ink proportion, there will be no greater error sheet number; substrate characteristics, printing equipment qualitative analysis of the characteristics are more important than the quantitative analysis; ink loss rate, stored ink factors are associated with the actual situation in the amount of printing substrates. In addition, although some numerical factors can not be accurately determined, but will not have much impact on the overall amount of ink calculation accuracy, the error may be generated can be controlled within a very small range. 

After the above parameters known, the formula can be obtained by clicking the desired spot color ink ink: 

A printed ink amount (g) = printing area * * ink layer thickness proportion 

The total amount of ink printed ink usage = a * Printing minimum number of print and on the amount of ink + ink wastage 

Of course, the characteristics of substrates, printing equipment characteristics, ink ink wastage and stored data have distinct personalities, different printers in the processing of various printing products, these data are variable, so be determined according to the actual situation. 

In short, the amount of color ink is very tedious and complicated to control, in order to save the cost of printing a spot color ink, constant song is perfect color centers based on the reduced cost of ink, and quantitatively precise as possible for you to print and provide scientific partners computer color scheme.


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