Each printer company has its own ink model and classification method. In fact, various industrial inks have different technical parameters such as physical chemistry. Therefore, the inks of different brands of printers cannot replace each other.
Continuing ink jet printing system (CIJ) is a more complex inkjet system. Its greatest advantage lies in the high-speed printing of numbers or letters. However, due to the large number of ink lines and components inside the machine, the ink is long. The route finally reaches the nozzle, and the charge and viscosity values ​​of each ink dot must be within a standard range so that the charged dot flight will not deviate from its normal position. Especially for different industries need a variety of ink to meet customer requirements, and different ink physics and chemistry parameters are different, so almost every brand of inkjet printer has more than 50 kinds of ink. Therefore, CIJ equipment has higher requirements for ink.
The on-demand ink-jet printing system (DOD) is characterized by short ink supply routes, and is not recycled. The indicators are stable, so the failure rate is much lower than that of CIJ equipment. Valve-type nozzles are widely used to print larger characters on the outer package (currently made). If it is a high-precision nozzle (UK xaar nozzle, the United States HP nozzle) can print 600dpi high-quality images (CIJ device resolution 20dp ), but the DOD device's print speed is limited.
The biggest difference between the ink of a DOD device and the ink of a CIJ device is that the former does not need to be charged.
What is the difference between small character ink and large character ink?
In terms of physical characteristics, the small character ink has a higher character ink viscosity, and the ink filter accuracy is also much higher than the large character ink. Chemically speaking, small character inks are conductive inks, and large character inks are non-conductive, due to their different working principles.
Why do small character inks have to be thinner before they can be used?
First of all we must first understand what is thinner.
Diluent, also called diluent or solvent. He is the basic solvent for ink. The role of the diluent is to dilute the ink to a standard viscosity set by the printer. This process is done automatically in the ink mixing cylinder. The printer uses a viscosity detector to determine whether to add ink or add dilution. Agent. Only the viscosity of the ink is within the range set by the machine. The charging of the ink and the flying distance of the ink dots will not deviate. The printing effect can be guaranteed.
So why don't we just adjust the ink to a standard viscosity, and so much of it is so arduous?
The answer is due to the fact that the small-size machine is a continuous ink supply principle. Standard viscosity ink is in contact with the atmosphere during the cycle. The solvent in the ink continuously evaporates, causing the ink viscosity to gradually increase, and the high viscosity will affect the charging of ink dots. Affecting the flying distance of the ink dots, the printing effect has errors. Therefore, when the viscosity of the ink is detected to be abnormal, the machine automatically adds thinner to ensure that the ink in the mixing cylinder maintains a standard viscosity value to ensure the print quality.
Why doesn't big character ink need to add thinner?
Large character ink is based on the principle of ink supply, ink in a relatively confined space, the viscosity value will not be affected by the outside world, so as long as the physical and chemical indicators of the ink to adjust the machine to set the range can be used normally.
Each printer company has its own ink model and classification method. In fact, various industrial inks have different technical parameters such as physical chemistry. Therefore, the inks of different brands of printers cannot replace each other.
The continuous ink jet printing system (CIJ) is a more complex ink jet system. Its greatest advantage lies in the high-speed printing of numbers or letters. However, due to the large number of ink lines and components inside the machine, the ink is long. The route finally reaches the nozzle, and the charge and viscosity values ​​of each ink dot must be within a standard range so that the charged dot flight will not deviate from its normal position. Especially for different industries need a variety of ink to meet customer requirements, and different ink physics and chemistry parameters are different, so almost every brand of inkjet printer has more than 50 kinds of ink. Therefore, CIJ equipment has higher requirements for ink.
The on-demand ink-jet printing system (DOD) is characterized by short ink supply routes, and is not recycled. The indicators are stable, so the failure rate is much lower than that of CIJ equipment. Valve-type nozzles are widely used to print larger characters on the outer package (currently made). If it is a high-precision nozzle (UK xaar nozzle, the United States HP nozzle) can print 600dpi high-quality images (CIJ device resolution 20dp ), but the DOD device's print speed is limited.
The biggest difference between the ink of a DOD device and the ink of a CIJ device is that the former does not need to be charged.
What is the difference between small character ink and large character ink?
In terms of physical characteristics, the small character ink has a higher character ink viscosity, and the ink filter accuracy is also much higher than the large character ink. Chemically speaking, small character inks are conductive inks, and large character inks are non-conductive, due to their different working principles.
Why do small character inks have to be thinner before they can be used?
First of all we must first understand what is thinner.
Diluent, also called diluent or solvent. He is the basic solvent for ink. The role of the diluent is to dilute the ink to a standard viscosity set by the printer. This process is done automatically in the ink mixing cylinder. The printer uses a viscosity detector to determine whether to add ink or add dilution. Agent. Only the viscosity of the ink is within the range set by the machine. The charging of the ink and the flying distance of the ink dots will not deviate. The printing effect can be guaranteed.
So why don't we just adjust the ink to a standard viscosity, and so much of it is so arduous?
The answer is due to the fact that the small-size machine is a continuous ink supply principle. Standard viscosity ink is in contact with the atmosphere during the cycle. The solvent in the ink continuously evaporates, causing the ink viscosity to gradually increase, and the high viscosity will affect the charging of ink dots. Affecting the flying distance of the ink dots, the printing effect has errors. Therefore, when the viscosity of the ink is detected to be abnormal, the machine automatically adds thinner to ensure that the ink in the mixing cylinder maintains a standard viscosity value to ensure the print quality.
Why doesn't big character ink need to add thinner?
Large character ink is based on the principle of ink supply, ink in a relatively confined space, the viscosity value will not be affected by the outside world, so as long as the physical and chemical indicators of the ink to adjust the machine to set the range can be used normally.
What is the ink compatibility?
Mixtures of different inks, between dyes and dyes, between solvents, whether there is mutual solubility between dyes and solvents, otherwise, chemical denaturation may occur, which may cause the dye/pigment in the ink to crystallize out. In addition, whether or not dyes of different dyes react to other added components requires the dyes to be tested as follows, resistance to reducing agents, resistance to oxidants, resistance to fluorine, and resistance to preservatives. This is what we call the compatibility test.
For example, A ink can be mixed with B ink and can be mixed with C ink, but it does not mean that B and C can be compatible with each other. In general, better compatible dyes or pigments have higher purchase costs.
Why are the same inks different in adhesion to different surface materials?
This part of the printing characteristics is affected by three parts: the molecular structure characteristics of the ink jet pigment itself determines the fastness of dyeing itself, which means that the dye/pigment itself has a high level of fastness of dyeing, and the external performance embodied is excellent; secondly, The characteristics of the print media itself, such as the performance of the media coating, largely determine the print quality of the ink; finally, the ink formulation, the ink solvent, additives in the additive surface treatment of the ink, can also increase the preservation of the print effect. Persistence.
(1) The relationship between ink and media:
Whether it is ordinary ink or migration-resistant ink, the print media has a profound effect on the dryness of the ink. Different types of media have a great influence on ink persistence. For ordinary paper and special paper, the difference in lightfastness may be more than 20 years.
(2) Structural properties of the pigment itself:
Dyes and pigments have a great difference in the chemical stability of the chromophoric groups in the molecular structure, regardless of the photodecomposition of the molecular structure due to the irradiation of pigments in indoor light and the oxidative decomposition of ozone in the outdoor sunlight to make the pigments. The degree of denaturation is different, so the lightfastness of the ink varies greatly. For pigments of the same nature, because of different molecular structures, the chemical stability of the chromophore groups is also different. When screening the pigments, the light fastness rating must be considered. The higher the grade, the better the lightfastness.
(3) Additives such as solvents and additives added to the ink
Ink added UV absorbers, photoinitiators, adding water-based resins, etc. to modify the ink to improve the light stability of the ink.
Why are some compatible inks used for a period of time with a cottony deposit in the filter?
In the process of production and synthesis of the ink color, because of the impure raw material or the intermediate product (such as organic polymer tar) produced by the synthesis reaction, the insoluble matter can be filtered out, and if the soluble tar material is not removed by a special method (recrystallization , ultrafiltration membrane separation, etc.), in the long-term use of the ink may produce electrochemical reactions, the emergence of flocculation deposition, it is easy to accumulate in the machine's filter or accumulate in the printhead tube wall. This is a potential quality problem for ink, and the general ink factory will not publish this defect.
Sometimes cleaning can be done, and if the accumulation is excessive, the filter must be replaced.
If the conductivity of the ink is too high, there will be too much inorganic salt. If the content of chloride ion is too high in combination with the inorganic salt, there will be potential corrosion to the print head; in addition, the ink system will produce electrochemical reactions. It may cause the dye to crystallize, accumulate on the filter screen or plug the nozzle.
Different brands or models of printers generally use different types of inks, and the specific parameters of these inks are different.
Generally can not be used interchangeably.
For example, viscosity parameters:
The Viscosity range of 270BK ink commonly used in Domino is: 5.9-6.4 (cps) (25°C)
The Viscosity range of the 8530 ink commonly used with Videojet is: 2.4-2.8 (cps) (25°C)
Author/Ms. Jing Wu Shanghai Broad Canal Trading Company