First, the solvent to speed up the printing speed adjustment of the ink, increase the proportion of solvent, preferably the proportion of quick-drying solvent, which is the most intuitive approach.

However, in the printing process, due to the performance limitations of the original ink, it is impossible to make a wide range of adjustments. In addition, the intuitive point is that it often leads to an increase in the cost of thinners, especially when oil is greatly increased.

Before increasing the solvent, it is necessary to consider whether the color density of the ink becomes shallow, that is, the viscosity of the packaging printing ink is not the same under the same solvent conditions. For example, after adding 30% of the solvent, consider its solubility, hydrogen bonding force, volatilization rate balance, surface tension and so on.

Generally speaking, from the solvent ratio, the following three recipes have their own merits:

Formulation 1: xylene 9.6; butyl acetate 9; ethyl acetate 26.4; toluene 55 (its properties are: volatile rate 2.94; solubility 8.98; hydrogen bond strength 18.18; surface tension 26.9; molecular weight 90.55)

Formulation 2: Toluene 70; Ethyl acetate 30 (its properties are: volatility 2.94; solubility 8.98; hydrogen bonding force 18.12; surface tension 27.1; molecular weight 90.86)

Formulation 3: Toluene 73.3; Ethyl Ketone 26.7 (its properties are: Volatilization rate 2.94; Solubility 9.05; Hydrogen bonding force 18.18; Surface tension 27.09; Molecular weight 84.72)

A brief analysis from the above three recipes:

1. Viscosity: Formula 2 has a high viscosity, Formula 1 has a moderate viscosity, and Formula 3 has the lowest viscosity.

2. Drying speed from two solvents alone: ​​1 and 2 and 3 drying speeds look the same, but there are still differences. Formulations 1 and 3 have the same volatilization rate, but 3 has a low viscosity and relatively low volatility drying.

3, from the cost comparison, 3 to 1 cost slightly higher. But the susceptibility and attachment of 3-butanone remained slightly worse than 1.

4. Compared with comprehensive benefits, formula 2 has low cost, high viscosity, good adhesion, low odor and better solubility. However, in the actual package printing process, the solvent volatilization balance at the time of film formation of the ink is better than that of Formulation 1, which is better than 2, 3, since many solvents have the same volatilization rate in terms of conversion, but due to a variety of ) Solvent dilutes the ink to improve the range of printability of the package printing, allowing the printing manufacturer to have a broader range of solvent selection and printing machine speed adjustment surfaces. Because of the evaporation of a single solvent during the process of independent packaging printing, it is dried by the slow evaporation (the process of film formation of printing ink). When the wet ink film of its printing ink reaches a certain interface strength, it will solidify into a film. The process of forming the ink film for printing and printing also reduces the solvent of the printing ink film that has been volatilized (ran away) in the future, and prolongs the thorough drying time (dryness) of the ink film for packaging and printing. As a result, a phenomenon (failure) occurs after the tape is peeled off from the tape after printing. For this reason, a general printing operator selects a solvent-dilution ink having a small molecular weight (ie, a small viscosity) and a fast film formation for the printing job, and a low-molecular-weight solvent is an overhand method for cutting the silk head of the printing ink.

Second, the use of wax additives to add wax or increase the purpose of wax is to reduce the ink in the packaging printing process due to the silk head is too long caused by the above-mentioned consequences, followed by the ink system to solve the pigment, filler settling agglomeration and ink film hardness , And can effectively increase the ink ink film thickness in the packaging printing process.

However, too much addition tends to hinder the volatilization of the solvent in the printing ink system, thorough drying and surface crusting, and ink transfer, poor flowability in the transfer printing process, reduction in surface gloss, and the like.

Therefore, it is very effective in solving the problems of package printing, blocking, blocking, and masking. However, the excessive addition will speed up the softening of the ink film, causing the printing transfer rubbing ink to heat up and causing the ink splash to malfunction.

Third, increase the proportion of pigments and fillers. The increase of solid pigments and fillers is a very simple method for reducing the film-forming process of packaging printing inks. Its role is to disperse the coating ratio of the resin (competitive adsorption) to prevent the filament from becoming too long. The ultimate goal is to prevent the printing machinery from advancing from slow to fast. The thinning of the film is thickened; trailing and eliminating the edge ghost due to the flow of the ink; the ink is remedied due to poor hiding power.