The difference between flavor inks and common inks is the use of perfumes. In order to maintain the stability and longevity of the flavors, the perfumes are made into a microcapsule with fragrance. The fragrance ink is mainly composed of a binder, a colorant, an auxiliary agent and a spice microcapsule. The main components of the ink are esters, alcohols or ketones, aromatic hydrocarbons, and the main components of the perfume are generally alcohols, phenols, ethers, aldehydes, ketones or esters. In general, both can coexist.
At the time of production, since the size of the microcapsules of the aromas is small, they stick together and aggregate to form many aggregates which are many times larger than those of the aromatized microcapsules. Therefore, they are mechanically ground and dispersed to a desired degree. After the fragrance ink is prepared, it is necessary to use a dispersing device for stirring, and a high-speed impeller mixer is an ideal device for dispersing the fragrance ink. Pre-dispersed inks on high speed impeller mixers should have high viscosity without too severe thixotropy. To do this is easier, you can use high-grained binders in the ink or increase the pigment content.
It is the easiest and most suitable method to use the silk screen printing technology to enter the hair and fragrance printing. However, the following points must be noted:
1, the choice of screen The mesh width of the screen should be at least 3 to 4 times the diameter of the pigment (or filler) particles in the ink. In addition, the screen weaving form also has a certain influence on the screen printing suitability.
2. Viscosity of inks Screen printing requires higher viscosity. The general viscosity is the force applied by the squeegee to the ink divided by the speed of the squeegee. The viscosity of the screen printing ink is about 2 Pa.s.
3. The printing speed requires that the printing speed (squeegee speed) should not be too fast. In order to ensure the quality, the knife speed should be compatible with the speed of ink filling and ink release.
4. The printing pressure requires that the printing pressure (ie the squeegee pressure) cannot be too large, which depends on the level of the squeegee.
5. In order to obtain the correct color, the ink color reconciliation should be carried out under stable natural light. Dark ink should be added gradually, and the hue of the mixture should be reduced as much as possible. In addition, attention should be paid to the color change before and after the drying and before and after the emission of the fragrance. All these need to accumulate experience in practice and make a variety of samples and color marks for continuous observation.
6, drying method The drying temperature can not be too high, can not use infrared drying, generally volatile drying.