Offset ink additives

Ink auxiliaries are auxiliary materials that are used to adjust inks to different printing conditions. There are many types of ink additives, commonly used are relieving agent, dispersant, desiccant, anti-drying agent, thinner, anti-friction agent, varnish, anti-fouling agent, varnish, etc. The role of ink additives and its use.
First, the adhesive removal agent has a very small viscosity, and is generally used for lithographic and flexographic printing inks to reduce its viscosity. In offset printing, due to changes in paper properties and printing conditions, such as large oil absorption, poor surface strength, and positive and negative surface coating phenomenon, when the desiccant is excessive or the room temperature of the printing room is too low, it will cause the paper to pull the hair, printing Stacking, pasting, and other defects affect the quality of printed products. Therefore, when the above phenomenon occurs, an appropriate amount of detaching agent can be added, so that the above failure can be reduced and eliminated.
Second, the withdrawal agent withdrawal agent, also known as diluting agent, is the use of large amounts of additives in offset printing. There are two common light-reducing agents: one is a clear oil for use in bright inks, and the other is a resin-type lighter for resin inks. If the ink is found to be too dark to restore originals during printing, appropriate amount of lightener can be added to achieve the desired effect.
Third, desiccant desiccant is one of the most important printing ink additives. According to the printing conditions and the printed paper, the amount, type, and method of use of the desiccant are also different. The commonly used desiccants are red dry oil and dry white oil. The dryness of red dry oil is from outside to inside and the white bath oil is dried simultaneously with the outside. When printing, I chose the type of dry oil according to the drying requirements of the printed product and the ink color. The amount of general dry oil is 2% -3%, too much will instead be based on the contrary, so that the drying rate decreased.
Fourth, anti-desiccant anti-desiccant is also called antioxidants, which is an ink agent with the opposite of desiccant. In the printing process, shutdowns are often caused by various reasons. When the downtime is long, the ink on the ink will dry out. In order to solve such problems, it is necessary to add appropriate amount of anti-drying agent to the ink on the machine and run the machine a few times so that it will not dry too quickly.
Fifth, thinner in the printing due to ink viscosity is too large or poor quality of paper, etc., often will produce paper pull hair, off the version and other faults, affect the normal printing, at this time, in addition to adding the appropriate amount of ungreaser to reduce the viscosity of ink In addition, a small amount of thinner can also be added to reduce the viscosity of the ink and allow printing to proceed smoothly. There are many types of diluents, which are generally low-viscosity No. 6 varnish.
Sixth, anti-friction agent The anti-friction agent is also called smoothing agent. Most of these substances are based on wax materials. When printing ink particles are coarse, such as white ink, gold and silver ink, etc., add a certain amount of resistance, increase the resistance of the print. Friction and smoothness.
Seventh, cover gloss oil trademarks, pictures and other high-grade prints, printed products are mostly covered by light treatment, in order to achieve high light effect, the use of varnish, the base can be added to the ink before printing, can also be After printing, printed with a varnish. However, overprinted prints tend to yellow after a long exposure, and their light resistance is poor. Therefore, many new gloss oils that have been replaced with varnish have been used.
In addition to the above-mentioned several commonly used ink additives, there are anti-smearing agent, anti-foaming agent, printing gold oil, etc., will not repeat them here, use only in strict accordance with the instructions required to operate.