Packing Printing Ink Hazard and Prevention (2)

Usually the amount of addition is between 0.1-0.3%. Because of the different temperatures and humidity throughout the year, the speed of the crust is somewhat different. Therefore, it is 0.1% in winter, 0.3% in summer, and 0.2% in spring and autumn. Again depending on the composition of the formula is only scientific.

2, ink film dry rate. Regardless of the oxidation or evaporation rate at normal temperature or the rate of evaporation, we have proved in practice that the amount of methyl ethyl ketone oxime in offset printing inks made from alkyd resins is generally 1%. Although the drying speed is slightly longer, it is still in the package printing. Within the prescribed standards. This is due to the fact that the complex formed by the auxiliaries and the driers causes the activator to temporarily lose its activity. Therefore, unlike the conventional principle of using a phenolic compound to trap the living radicals to terminate the polymerization reaction, the quinone compound is different. The effect on the dry rate is not significant, if the amount is too much, the volatilization time is prolonged, and the disintegration of the complex is too slow, which often affects the film forming and drying rate of the packaging printing ink.

3, yellowing. Once the anti-skinning agent exceeds 0.3%, yellowing of the printing ink film is often caused, and in particular, it is used in a white ink, which causes yellowing problems when stored for a long time. Therefore, the occurrence of yellowing failure can be avoided by strictly controlling the amount of addition or changing to butyraldehyde oxime.

4. Color degree. After the packaging printing ink is added with the prevention of the skinning agent, it will often directly affect the color degree of the ink. Generally, the effect of the ink change is greater than that of the color ink, and the printing effect of the white or yellow ink is greater than that of the deep color packaging printing ink. In general, this phenomenon is difficult to observe by visual inspection and is independent of the added amount. Although we already know that the hue of the ink film is not affected by the filming and drying of the packaging and printing graphics, but in the presence of certain pigments (such as amphoteric pigments) and driers, the color ink film for packaging and printing is packaged and printed. There will be significant differences between shades that will plague palettes. When encountering this kind of situation, should carry on the experiment of chromatic aberration first while making the ink continuously and draw a picture, its purpose is to prevent the appearance quality of the ink membrane from affecting because of discoloration after printing.

5. Printing ink film state. Although the anti-skinning agent does not have any influence on the state of the printed ink film, the packaged printing ink will precipitate crystals when it is stored at a low temperature for a long period of time, resulting in cloudy turbidity of the packaged printing ink and hindering the luster of the ink film. If the above mentioned materials are not properly designed with the binders, pigments, fillers and driers in the ink system, larger particles will appear. Therefore, it should be tested before printing.

6. Luster and weather resistance. After the addition of the anti-skinning agent, the gloss of the printing ink is not only not affected, but also has gloss retention. After adding additives, the weather resistance of the printing ink film has been improved and improved.