Spot color refers to the printing of non-C, M, Y, K four-color ink superimposed pure color ink. It can be pre-mixed with the three primary colors, or it may not be formulated with three primary colors, because some special spot colors can not be formulated with the four colors of C, M, Y, and K, such as silver, gold, and fluorescent colors. Some bright colors. In the offset printing process, the spot color set is usually placed on the later attached unit because it does not need to be overprinted on other color blocks.
Spot color printing can not only solve overprinting problems in printing, but also can meet the quality requirements of innovative designs, and the balance of ink and water in printing is also relatively easy to grasp. Therefore, spot color inks are widely used in some printing applications, such as printing in packaging and printing. Tobacco, wine, cosmetics, pharmaceuticals, daily necessities, and other packaging, often use spot color inks to ensure the consistency of the color of the printed matter; in anti-counterfeit printing, in order to improve security, often use special printing technology of security materials , With safety anti-counterfeit spot color inks to enhance the anti-counterfeiting effect; In the map printing, due to the limitations of the process and printing objects, in order to get the ideal color performance, often use a lot of spot color printing, and some will reach more than 20 colors In some special printing, spot color printing is often used to express its special effects.
However, the use of spot color inks is too small compared to four-color inks. The ink factory cannot form a production scale, resulting in a high cost of spot color inks. In general, ink suppliers do not supply spot color inks, so most of the current Spot color inks are all self-provisioned by the printing company, and the amount of usage is based on experience. Due to the small amount of spot color ink, and the preparation can not be less than the actual amount used, it can only be equipped with more, but it is easy to produce the remaining ink. If it is four-color ink, it can be quickly used in the next printing job, without having to consider the problem of remaining ink. However, for spot color inks, due to infrequent use, placing them for a long time will affect their performance and failure. The large amount of remaining ink is a very important factor that affects production costs and cannot be ignored.
The key to this issue is how to determine the amount of ink used in printing. Currently, ink manufacturers or suppliers at home and abroad provide a rough algorithm for the amount of ink, or according to the algorithm provided by the printer, according to the algorithm, directly give the ink required by the printer. For example, VANSON INK in the Netherlands provides users with an ink Estimator gadget to calculate ink usage; British Coates ink company also put forward its own ink calculation method; domestic printers also come to a conclusion on the basis of practice. Some ink calculation methods. Of course, these algorithms are all estimates, and their accuracy is not acceptable to every printer.
Here's a brief description of how to calculate the amount of ink needed for printing. First of all, it is necessary to analyze various factors that affect the amount of ink. The main factors are: printing area, ink layer thickness, ink specific gravity, number of printed sheets, substrate characteristics (absorption, smoothness, paper strength), printing machinery characteristics (printing pressure and Speed, minimum amount of ink on the press), ink loss rate, pre-stored ink (a variety of unknown factors).
The situation considered here is offset printing, the ink consumption of the printing press under normal working conditions. Some elements of the printing environment, such as printing speed, printing pressure, and substrate status, can be considered as reasonable changes within the scope of printing qualified prints.
The specific data on how to obtain these influencing factors are briefly analyzed as follows.
1. Printing area
The size of the printing area and the thickness of the ink layer determine the volume of the ink and the weight of the ink, and the size of the printing area is determined by the graphic of the printing manuscript, but it is difficult to determine the actual graphic area that a spot color needs to cover. Due to the complexity of the manuscript, it is easy to obtain the actual printed area for manuscripts with regular graphics and known dot percentages; however, it is more complicated for irregular pictures and continuous changes in dot area, or for more complex dot area variations. How to calculate the actual printing area of ​​a printed manuscript?
Here is a printing area calculation method—digital image processing method—which has not yet been applied in practice. The main steps of this method are as follows: 1 digital image acquisition and storage of the original image of a given area; 2 processing of the collected original information; 3 output of the operation result, that is, the output summation value, which is the actual need to print The dot area. This method can be programmed in the VC++ environment.
In practice, there are two common methods that can be used to calculate the printed dot area. One is the formula for calculating the percentage of outlets, which is the Yule-Nielsen formula. However, this method itself also has certain flaws, such as the need of the rules of the dot area, the value of n in the formula is not easy to determine accurately, so the overall effect is not ideal. The other is the method that some printing factories are already using nowadays. The specific method is to copy the pattern to be printed on the carbon paper and weigh it. At the same time, cut a piece of the same carbon paper with a size of 10cm×10cm and weigh it. Calculate the graphic area: graphic area (cm2) = (100 × pattern weight)/square weight. However, the drawback of this method is that if the pattern is too complex, it is not easy to cut completely, and at the same time, too many human operations increase the uncontrollable factors, and the probability of error increases, which affects the accuracy.
(to be continued)
Spot color printing can not only solve overprinting problems in printing, but also can meet the quality requirements of innovative designs, and the balance of ink and water in printing is also relatively easy to grasp. Therefore, spot color inks are widely used in some printing applications, such as printing in packaging and printing. Tobacco, wine, cosmetics, pharmaceuticals, daily necessities, and other packaging, often use spot color inks to ensure the consistency of the color of the printed matter; in anti-counterfeit printing, in order to improve security, often use special printing technology of security materials , With safety anti-counterfeit spot color inks to enhance the anti-counterfeiting effect; In the map printing, due to the limitations of the process and printing objects, in order to get the ideal color performance, often use a lot of spot color printing, and some will reach more than 20 colors In some special printing, spot color printing is often used to express its special effects.
However, the use of spot color inks is too small compared to four-color inks. The ink factory cannot form a production scale, resulting in a high cost of spot color inks. In general, ink suppliers do not supply spot color inks, so most of the current Spot color inks are all self-provisioned by the printing company, and the amount of usage is based on experience. Due to the small amount of spot color ink, and the preparation can not be less than the actual amount used, it can only be equipped with more, but it is easy to produce the remaining ink. If it is four-color ink, it can be quickly used in the next printing job, without having to consider the problem of remaining ink. However, for spot color inks, due to infrequent use, placing them for a long time will affect their performance and failure. The large amount of remaining ink is a very important factor that affects production costs and cannot be ignored.
The key to this issue is how to determine the amount of ink used in printing. Currently, ink manufacturers or suppliers at home and abroad provide a rough algorithm for the amount of ink, or according to the algorithm provided by the printer, according to the algorithm, directly give the ink required by the printer. For example, VANSON INK in the Netherlands provides users with an ink Estimator gadget to calculate ink usage; British Coates ink company also put forward its own ink calculation method; domestic printers also come to a conclusion on the basis of practice. Some ink calculation methods. Of course, these algorithms are all estimates, and their accuracy is not acceptable to every printer.
Here's a brief description of how to calculate the amount of ink needed for printing. First of all, it is necessary to analyze various factors that affect the amount of ink. The main factors are: printing area, ink layer thickness, ink specific gravity, number of printed sheets, substrate characteristics (absorption, smoothness, paper strength), printing machinery characteristics (printing pressure and Speed, minimum amount of ink on the press), ink loss rate, pre-stored ink (a variety of unknown factors).
The situation considered here is offset printing, the ink consumption of the printing press under normal working conditions. Some elements of the printing environment, such as printing speed, printing pressure, and substrate status, can be considered as reasonable changes within the scope of printing qualified prints.
The specific data on how to obtain these influencing factors are briefly analyzed as follows.
1. Printing area
The size of the printing area and the thickness of the ink layer determine the volume of the ink and the weight of the ink, and the size of the printing area is determined by the graphic of the printing manuscript, but it is difficult to determine the actual graphic area that a spot color needs to cover. Due to the complexity of the manuscript, it is easy to obtain the actual printed area for manuscripts with regular graphics and known dot percentages; however, it is more complicated for irregular pictures and continuous changes in dot area, or for more complex dot area variations. How to calculate the actual printing area of ​​a printed manuscript?
Here is a printing area calculation method—digital image processing method—which has not yet been applied in practice. The main steps of this method are as follows: 1 digital image acquisition and storage of the original image of a given area; 2 processing of the collected original information; 3 output of the operation result, that is, the output summation value, which is the actual need to print The dot area. This method can be programmed in the VC++ environment.
In practice, there are two common methods that can be used to calculate the printed dot area. One is the formula for calculating the percentage of outlets, which is the Yule-Nielsen formula. However, this method itself also has certain flaws, such as the need of the rules of the dot area, the value of n in the formula is not easy to determine accurately, so the overall effect is not ideal. The other is the method that some printing factories are already using nowadays. The specific method is to copy the pattern to be printed on the carbon paper and weigh it. At the same time, cut a piece of the same carbon paper with a size of 10cm×10cm and weigh it. Calculate the graphic area: graphic area (cm2) = (100 × pattern weight)/square weight. However, the drawback of this method is that if the pattern is too complex, it is not easy to cut completely, and at the same time, too many human operations increase the uncontrollable factors, and the probability of error increases, which affects the accuracy.
(to be continued)
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