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First, choose the five factors of ink:
The first five factors need to be set:
1. Printed Body: What substrate is printed on?
2. Printing conditions: What kind of machine is used to print, how much is the printing speed?
3. Printing effect: What kind of effect do you expect?
4. Processing conditions: how to process the printed matter after printing?
5. Purpose: What kind of use is the final product used for?
It is important to confirm these points before printing, and to select appropriate inks to prevent future failures.
1. The type of printed body is the most important factor in determining the type of ink used. Even the same type is often different due to the variety and grade. Therefore, the following points need to be investigated as closely as possible:
1 Type of printed material (composition of material). 2 product name (manufacturer). Grade 3 (thickness, presence or absence of anti-static agent and other additives). 4 Is there any pre-processing or processing method? 5 printing surface.
2. Printing conditions 1 The ability and location of the drying device. 2 printing speed. 3 version of the shape, number of lines. 4 How many colors and printing orders are printed? 5 temperature conditions in the printing shop. 6 There is no preheater, cooler operation. The drying speed of the ink is affected by various conditions such as the printing press and the environment, and it becomes a cause of unstable printing effect and a cause of birth defects. Such cases are sometimes encountered during the printing process.
3. Printing effect.
1 color. 2 concentration. 3 transparency, lid cover. 4 shiny, dull. 5 whether overlap printing. 6 printed on the table or in India. 7 Is there an additional printed glossy surface?
In addition, depending on the type of ink to be selected, restrictions are imposed on the use or durability of the printed matter. Therefore, the desired printing effect may not be obtained. Therefore, this should also be considered as one of the factors of product quality.
4. Processing Conditions Most prints and finished products become finished products after a single process. The processing conditions of this process must be judged to be suitable for the character of the ink. This is an important link to ensure product quality. The compatibility with the binder in the composite processing, the composite strength, the heat resistance of the heat sealer, and the like are closely related to the type of ink (ie, the resin in the binder), and need to be tested and investigated first. Another example is the boil-resistance boil-resistance, distillation-sterilization distillability, etc., in addition to the type of ink, and also the durability of the pigment used in the ink.
In addition to these processes, there are various processing methods. When these processes are performed, various processing machines (composite machines, heat sealers, embossing machines, etc.) and various materials for processing (such as AC agents) are used. , adhesives, waxes, etc.) all need to be fully investigated beforehand regarding the type of processing machine, the types, characteristics, and methods of use of various materials.
5. Purpose Before printing, it is necessary to investigate clearly what kind of state the print will eventually become. For what purpose? What are the various patience requirements for their use? What are the conditions? In these respects, if you do not fully negotiate with your customers in advance, you may have serious problems (such as compensation for finished products or contents). Pay special attention.
For example, the alkali resistance and water resistance of soap packaging, the oil resistance of oily food packaging, the odorlessness and non-toxicity of fast food packaging, and the cold resistance of frozen dessert packaging are all related to the resin properties of ink and the tolerance of pigments. Experiments and investigations. According to the above five factors, first select the appropriate ink type, and then determine the specific color, in this regard, you need to contact the ink manufacturer to obtain detailed information in order to achieve the most suitable ink for printing.
Second, the dilution method of the ink begins to wash, you must add a special thinner in the new ink, so that the ink reaches the viscosity suitable for printing. The correct dilution method is to slowly pour the solvent while stirring the ink, because the pigment particles in the ink are uniformly distributed in the resin and distributed throughout the system. If the multi-star solvent is used and rapidly diluted, the ink is affected. After the solvent hits, the uniformly distributed pigment particles are often exposed, the gloss and transparency are lost, and the printing effect is reduced. In this regard, the printing factory needs special attention.
In the printing process, a certain printing viscosity must be maintained in order to obtain a printed product having a uniform color tone. This is because the viscosity of the ink, the speed of the solvent drying, and the printing speed have an inseparable and close relationship. Usually, low viscosity is used in high-speed printing. Ink, low-speed printing using high-viscosity ink, but also need to be based on the depth of the version, there is no level change, etc., combined with the ink transferability, fluidity, concentration, etc., select the most appropriate printing viscosity printing.
Third, the ink concentration adjustment method Most manufacturers sell ink for the accuracy, concentration and fineness and other indicators have been formulated according to the formula of the factory quality standards, but in the printing, according to different requirements, sometimes need to properly adjust the ink concentration There are three ways to reduce the ink density and reduce the ink density:
1.Adjusting the concentration by adjusting the ink oil The soy sauce (also known as gold oil) is a material that contains various components other than the pigment in the ink. Therefore, when adjusting the concentration with soy sauce, the viscosity will remain unchanged. The formulation of resins and pigments has changed.
The use of adjusting the ink dilute, in addition to reducing the concentration of the role, but also improve the gloss and transparency. However, if a large amount of soy sauce is used in a small amount of ink, it tends to cause clogging, so care should be taken.
2. Use diluting agent to adjust the concentration of diluting agent (also known as thinning agent) is to replace the pigment part of the ink formulation with the so-called "plasma pigment" - a colorless pigment made of a transparent ink. Therefore, using a diluting agent to reduce the concentration, the viscosity of the ink remains unchanged, the ratio of the pigment and the resin can be kept substantially unchanged, and no blocking is caused, but the gloss and transparency of the ink are often reduced.
3. Add solvent to reduce the concentration This method can maintain a certain ratio of resin and pigment, the viscosity of the ink will also be reduced, but has a greater impact on the printing effect, but also limited by the dilution viscosity, except for a certain extent Concentration adjustment is not an ideal method.
IV. Storage and Management of Ink 1. Condition for Storage of New Ink The viscosity of the ink decreases as the temperature increases, and the viscosity decreases as the temperature decreases. Some inks placed in the environment below 3°C or below 0°C will freeze into a jelly state. The so-called gelling phenomenon occurs. If the ink is “gelledâ€, it usually needs to heat up to 5-10°C above the gel point to restore the original state. Therefore, in cold areas, the winter storage of ink should pay special attention.
When storing ink in winter, it should be stored in a non-fire source, try to warm it in some rooms, and avoid stacking outdoors. If gelation occurs, please put it in hot water and return it to its original condition before use. If the remaining insoluble matter that cannot be completely restored to the original state remains, it may cause troubles such as clogging of the mesh during printing, and clogging of the plate surface. For the sake of prudence, filtering and then using a metal mesh can eliminate these malfunctions.
2.Adjustment during storage of new inks Even if the ink is new, long-term storage does not move, the various components of the ink formulation sometimes also occur separation and precipitation phenomena, sometimes rust the inner wall of the container, resulting in failure in printing, In order to avoid these problems, they must be used in sequence according to the number and order of the warehouses.
3. The use of ink mixing As mentioned earlier, the long-term storage of ink, often in the formulation evenly mixed components stratification, or produce precipitation. Therefore, even if the new ink is used, the ink tank must be inverted and shaken, or used after being stirred.
4. Regarding the management of the remaining ink Since the solvent used for the gravure plastic ink is a low-boiling-point solvent, the volatilization during the printing process may cause the mixing ratio of the solvent to be misaligned, or the surface of the ink or the surface of the roller due to the temperature drop caused by the volatilization of the solvent. Extremely cool, so that the moisture in the air penetrates into the ink. In addition, in the printing process, due to the debris of the film and the dust inhaled into the ink and other reasons, especially the pattern area is small, the amount of ink is less likely to change. The remaining ink tends to have a lower viscosity, and separation and precipitation occur faster. Therefore, when it is reused, it must be fully stirred or filtered with a mesh of 1000 mesh or more, and then mixed with the new ink for digestion.
If you continue to store it, it must be sealed, marked with the type of ink, attached with the mark, and placed in a dark place.
In the planning of gravure printing, from which aspects to consider to select the ink that meets the requirements, what conditions must be guaranteed, which is the primary problem for each printing factory. Here are some explanations on these contents.