How to measure the performance of ink

1. Solvent adjustment of the ink when accelerating the printing speed, increase the proportion of solvent, preferably the proportion of quick-drying solvent, this is the most intuitive approach.

But in the printing process, due to the limitations of the performance of the original ink, it is impossible to make a large range of adjustments. Another intuitive point is that it often leads to an increase in the cost of thinners, especially in the current oil prices.

Before increasing the solvent, it must be considered whether the color density of the ink becomes lighter, that is, under the same solvent ratio, the viscosity of the packaging printing ink is also different. For example, after adding 30% solvent, the solubility, hydrogen bonding force, volatilization rate balance, surface tension, etc. should be considered.

Generally speaking from the solvent ratio, the following three formulas have their own advantages:

Formula 1: Xylene 9.6; butyl acetate 9; ethyl acetate 26.4; toluene 55 (its properties are: volatilization rate 2.94; solubility 8.98; hydrogen bonding force 18.18; surface tension 26.9; molecular weight 90.55)

Formulation 2: Toluene 70; ethyl acetate 30 (its properties are: volatilization rate 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)

Brief analysis from the above three formulas:

1. Viscosity: formula â‘¡ has high viscosity, formula â‘  has moderate viscosity, and formula â‘¢ has the lowest viscosity.

2. The drying speeds of the two solvents alone: ​​①, ② and ③ seem to be the same, but there are still differences. For example, formulas ① and ③ have the same volatilization rate, but ③ has a low viscosity, and drying with low volatility is relatively fast.

3. In terms of cost comparison, â‘¢ is slightly higher than â‘ . But â‘¢ the odor and adhesion of butanone which are easy to remain are slightly worse than â‘ .

4. Compared with comprehensive benefits, formula â‘¡ has low cost, high viscosity, good adhesion, low odor, and better solubility. However, in the actual packaging and printing process, in terms of the solvent volatilization balance of the ink film formation, the formula â‘  is better than â‘¡, â‘¢, because the volatility rate of multiple solvents is the same in conversion, but due to multiple (mixed ) The solvent dilutes the ink and improves the printing suitability range of the package printing, so that the printing manufacturer has a wider choice of solvents and the adjustment surface of the printing machine speed. Because the single solvent's volatilization in the process of independent packaging and printing is due to the slow volatilization of the front and back (the process of printing graphic ink film formation) and drying. When the wet ink film of its printing ink reaches a certain interface strength, it will solidify to form a film. The formation process of the printed graphic ink film also correspondingly slows down (slows down) the solvent that the printed ink film has to volatilize (run away) in the future, and extends the complete drying time of the printed graphic ink film (drying out), As a result, the phenomenon (fault) of sticking with adhesive tape after printing and falling off occurs. For this reason, general printing operators will choose solvents with low molecular weight (that is, low viscosity) and fast film formation to dilute the ink for printing. Low molecular weight solvents are the usual method of cutting the printing ink filament head too long.

2. The purpose of using wax additives to add wax or increase wax is to reduce the above-mentioned consequences caused by too long filament heads in the packaging and printing process of ink, followed by solving the ink system's color, filler sedimentation and agglomeration and ink film hardness And can effectively increase the thickness of the ink film in the packaging printing process of the ink.

However, excessive addition will often hinder the volatilization of the solvent in the printing ink system, the complete drying, the surface skinning and the transfer of the ink, the poor fluidity of the transfer printing process, the reduction of the surface gloss and so on.

Therefore, it is indeed very effective in solving the problems of packaging paste, adhesion, and covering, but excessive addition will accelerate the softening of the ink film, so that when the printing transfer friction ink heats up, ink splashing occurs.

3. Increasing the ratio of color and filler. The increase of solid color and filler is a very convenient way to reduce the film formation process of packaging printing ink. Its role is to disperse the coating ratio of the resin (competitive adsorption) to inhibit the filament head from being too long. Its ultimate purpose is to prevent the printing machine from sticking to the packaging and printing products and printing graphics and ink due to the length of the filament head after slow to fast speed. Thinning and thickening of the film; tailing due to the flow of ink to eliminate edge ghosting; ink is remedied due to poor transparent hiding power.

Makeup Bag

Portable waterproof travel bag, foldable waterproof luggage bag, business waterproof luggage bag, waterproof storage bag,Backpack bag

Dongguan Jinying Handbags Co.,Ltd , https://www.jinyingbag.com