Adhesive for adjusting ink properties - anti-smudge agent (anti-adhesive agent)
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Although many fast-fixing inks have been developed, it is intended to speed up the initial solidification of the ink by means of the physical changes of the ink and the paper itself, to support the stack of paper and the slight pull of the printing. However, the problem has not been completely solved. Especially in the speed, multi-color, high-grade paper printing. At present, anti-cracking agents are still in use and are developing.
The first is powdery anti-cracking agent, which is a mixture of six grains of corn (corn starch), among which magnesium carbonate, calcium carbonate, fumed silica and wax powder are the most, and the composition has a fineness of about 15 microns. , non-hygroscopic, neutral, smooth powder. After printing, it is sprayed on the printing surface. This layer has no touch, does not affect the pattern, does not affect the powder of the printing, and drags the printed sheet on the top. Never get stuck.
On the printing machine, a dusting mechanism is generally installed, and the powder is regularly sprayed on each printed product.
This is followed by aqueous emulsions and oily liquids or slurries. These materials are composed of liquid-solid two-phase materials, even immiscible materials, which can be added to the ink or sprayed. With the selective absorption of paper, the immiscible additive floats on the surface of the ink to form a "mat" to prevent dirt.
There are many such examples. For example, the silica gel is dispersed in an alkyd resin in an amount of 3% or less, and the hydrophobic-hydrophilic balance can be treated, the color brightness is increased, the ink system is stable, the drying is rapid, and the smear is prevented.
The polyamide resin and paraffin wax 82:18 are melted and pulverized to 15 micrometers, and used in 5% of the ink to increase gloss and prevent smudging.
The starch can also be dispersed in turpentine (pine perfume) plus potassium tartrate, a small amount of violet, used in the ink 0.5-3%, due to the coagulation of starch, and play a role in anti-smashing.
There are also some surfactants, such as silicone oil, which are added to the ink. Due to their light weight and miscibility, they can quickly fold off the surface of the ink film, increase the strength of the ink film under pressure, and its smoothness, and reduce the ink. The membrane lags in viscosity, thereby preventing smudging.