The key to the dirty and dry function of printed products
In a nutshell, infiltration is the basis for the fixation of the ink on the substrate; the fixation speed is the condition for the ink layer to dry in the medium term; the medium-term drying time is the key to the quality of the ink layer conjunctiva.
1. Infiltration is the basis for fixation
Resin-based medium and high-grade offset printing inks are mainly composed of resin, dry vegetable oil and ink oil. Among them, the resin is a high-viscosity phase in which it is dissolved in a dry vegetable oil; the ink oil is a low-viscosity phase, and the miscible (not true-soluble) state is equal to a high viscosity. Since the effect of the ink oil is only to dilute and reduce the viscosity of the front phase, the ink is adapted for use on the printing press. Therefore, when the ink has completed its "mission" (the moment when the ink is printed on the substrate), it must be left immediately. The ink system will leave as fast as possible. This is the prerequisite for ink fixation—penetration.
2. The fixing speed is the condition of the ink layer drying in the middle period
The fixing speed is mainly determined by the instantaneous penetration of the ink oil miscible in the ink system on the substrate. The greater the instantaneous penetration, the faster the separation of the high and low two-phase viscosities in the ink, the sharper increase in the high-viscosity component concentration of the resin and the dry vegetable oil, and the instantaneous physical change that causes the ink layer to form a gelled state and fix it in the printing Things. Whether the high and low phases can be completely separated not only determines the fixing speed of the ink layer, but also relates to the medium-drying time of the ink layer.
3. The middle drying time is the key to the quality of the ink layer conjunctiva
The so-called medium-drying time refers to the intermediate stage of the ink layer from the fixation to the conjunctiva. The time is about 3 hours. The phenomenon is similar to the conjunctival matter state, and there is a smooth and smooth feeling, but it cannot be rubbed hard. At this level of medium-term drying, it is known that the "solvent" completely escapes from the system, and that the dry vegetable oil has undergone oxygen-absorbing polymerization and gradually changes to the gel-solidified state, and finally reaches the complete drying of the conjunctiva. This is the key to benign conjunctiva.
4. Obviously, in order to infiltrate, there must be substrates with absorption properties. However, the aluminum foil on the surface of aluminum foil does not have such conditions.
Absorption of aluminum foil, whether it is the use of offset ink, or "special" ink, aluminum foil remains in the liquid solvent. This kind of ink layer is not only the main factor in the stickiness of the printed product, but also the source of poor dryness. Therefore, in order to overcome the difficulties of the printed products with dirty and dry defects, it is necessary to change the ink infiltration mode and improve the inherent conditions.
In a nutshell, infiltration is the basis for the fixation of the ink on the substrate; the fixation speed is the condition for the ink layer to dry in the medium term; the medium-term drying time is the key to the quality of the ink layer conjunctiva.
1. Infiltration is the basis for fixation
Resin-based medium and high-grade offset printing inks are mainly composed of resin, dry vegetable oil and ink oil. Among them, the resin is a high-viscosity phase in which it is dissolved in a dry vegetable oil; the ink oil is a low-viscosity phase, and the miscible (not true-soluble) state is equal to a high viscosity. Since the effect of the ink oil is only to dilute and reduce the viscosity of the front phase, the ink is adapted for use on the printing press. Therefore, when the ink has completed its "mission" (the moment when the ink is printed on the substrate), it must be left immediately. The ink system will leave as fast as possible. This is the prerequisite for ink fixation—penetration.
2. The fixing speed is the condition of the ink layer drying in the middle period
The fixing speed is mainly determined by the instantaneous penetration of the ink oil miscible in the ink system on the substrate. The greater the instantaneous penetration, the faster the separation of the high and low two-phase viscosities in the ink, the sharper increase in the high-viscosity component concentration of the resin and the dry vegetable oil, and the instantaneous physical change that causes the ink layer to form a gelled state and fix it in the printing Things. Whether the high and low phases can be completely separated not only determines the fixing speed of the ink layer, but also relates to the medium-drying time of the ink layer.
3. The middle drying time is the key to the quality of the ink layer conjunctiva
The so-called medium-drying time refers to the intermediate stage of the ink layer from the fixation to the conjunctiva. The time is about 3 hours. The phenomenon is similar to the conjunctival matter state, and there is a smooth and smooth feeling, but it cannot be rubbed hard. At this level of medium-term drying, it is known that the "solvent" completely escapes from the system, and that the dry vegetable oil has undergone oxygen-absorbing polymerization and gradually changes to the gel-solidified state, and finally reaches the complete drying of the conjunctiva. This is the key to benign conjunctiva.
4. Obviously, in order to infiltrate, there must be substrates with absorption properties. However, the aluminum foil on the surface of aluminum foil does not have such conditions.
Absorption of aluminum foil, whether it is the use of offset ink, or "special" ink, aluminum foil remains in the liquid solvent. This kind of ink layer is not only the main factor in the stickiness of the printed product, but also the source of poor dryness. Therefore, in order to overcome the difficulties of the printed products with dirty and dry defects, it is necessary to change the ink infiltration mode and improve the inherent conditions.
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