Textile ink defoamer solution

Customer type

1. Customer information: Philippine Shengyuan Textile is a textile company. Because the defoamer manufacturers often cut off the supply and cannot keep up with the production rhythm, and because the previous defoamer factory said that its products are silicone-free, but The client was a bit skeptical, so now I found Nanhui

2. Sample information: ink defoamer (latex (silk screen))

3. Customer requirements: solve floating matter and particulate suspended matter, please ship in time when providing

Principle and analysis of defoaming

Analysis of the cause of blistering:

1. The ink hasn't been evenly distributed during silk, and the temperature has not yet reached the requirements of ink-uniformity, especially on high-speed machines. The high speed and high printing pressure increase the peeling tension between the ink and the paper, and the cardboard blisters and delamination. At this time, only add a dampening solution to the ink roller, and the surface of the blanket should be cleaned without residual ink or gasoline. In winter or when the temperature is low, heat the ink to reduce the cohesion of the ink and increase the fluidity of the ink.

2. The unevenness of the three rollers of the printing press makes the blanket lose its elasticity quickly. Increased pressure. The unevenness of the blanket and liner. The uneven printing surface can only increase the printing pressure to compensate for the low part of the rubber, but the higher part will be when the pressure increases. The pressure is greater than normal. The aging of the surface of the blanket cannot transfer the imprints well, and the ink absorption of the surface decreases. When the paper slips on the surface of the blanket, the pressure increases and the paper delaminates and foams.

3. The printing effect must be solid and flat in the printing field and large ink volume, and the relative printing pressure is slightly increased, which requires high interlayer strength of the paper. There are also higher requirements for the fountain solution: the ink has less viscosity but good transferability, and stronger tinting power to achieve a leveling effect with a small amount of ink. This can reduce the occurrence of blistering and delamination.

Cause analysis on papermaking:

1. Insufficient bonding strength between layers. This phenomenon is mainly caused by improper control of beating process indicators during beating, and poor quality of interlayer starch.

2. Improper control of the temperature curve of the dryer, excessive drying, and excessive moisture release between layers, resulting in blistering.

The hazards of blistering:

① Reduce production efficiency and increase energy consumption.

②Printing surface defects and difficulties in production and printing.

Analysis of defoamer solution

1. The ink defoamer can reduce the local surface tension of the foam and cause the foam to burst

The origin of this mechanism is to sprinkle higher alcohol or vegetable oil on the foam. When it dissolves into the foam liquid, it will significantly reduce the surface tension there. Because these substances are generally less soluble in water, the reduction in surface tension is limited to the local area of the foam, and the surface tension around the foam hardly changes. The part with reduced surface tension is pulled and extended to the surroundings strongly, and finally ruptures.

2. The ink defoamer can destroy the elasticity of the film and cause the bubble to burst

When the defoamer is added to the foam system, it will diffuse to the gas-liquid interface, making it difficult for the foam-stabilizing surfactant to recover the elasticity of the film.

3. The ink defoamer JP-A can promote the liquid film to drain, thus causing the bubble to burst

The rate of foam drainage can reflect the stability of the foam. Adding a substance that accelerates the foam drainage can also play a defoaming effect.

Comparison of defoaming test

Formula selection