Industry solutions for defoamers for chemical technology and papermaking

Customer type

1. Customer information: Philippine Junlun Chemical Technology is specialized in papermaking auxiliaries, water treatment chemicals, etc. I found Nanhui because some friends said that Nanhui products are cost-effective and have their own laboratory and factory, so I want to try them. The product.

2. Sample information: paper pulp

3. Customer requirements: to eliminate the surface foam containing the AKD emulsion white water system and the bubbles adsorbed on the fiber during dehydration, it must have the function of continuous defoaming.

Principle and analysis of defoaming

1. Analysis of the cause of blistering:

1. Foaming during pulping

2. Washing, filtering pulp, bleaching, dehydrating, papermaking, sizing, coating and foaming

3. Foams caused by adhesives in coating formulations

4. A large amount of foam is generated in the papermaking process

5. The slurry falls in a waterfall shape and foam caused by the air leakage of the slurry pump

6. The pressure at the slag outlet of the cone cleaner is too low

7. Water treatment discharge bubbling

The hazards of blistering:

The foam produced in paper mills and pulp mills interferes with many processes, which can affect the efficiency of refiners, pumps, screens, centrifugal purifiers, deinking equipment, and dewatering equipment. Foam will also adversely affect the final paper formation, porosity, opacity, printability, smoothness, and bond strength between layers. Excessive foaming can cause loss of fiber and raw materials. Furthermore, the presence of residual air in the wet paper web can affect the filtration rate of the paper in the papermaking tooth. When there is a large amount of residual air on the paper or pad, since the water passing through the paper or pad must also pass through the bubbles, the filtration rate is reduced.

In the pulping process, foam handling is a thorny issue in production. From the operation of the pulping unit to the coating process: washing, filtering, bleaching, dewatering, papermaking, sizing, coating, etc., there are varying degrees of foam, which seriously affects normal production and paper quality.

The surface tension of the saponification produced during the pulping process is lower than the surface tension of the black liquor produced by the cooking material, so that it exists in the surface of the black liquor and forms a film, which forms foam under the mixing action of air, especially when The lower the concentration of the black liquor, the more the foam. In cooking harder raw materials and raw materials with high resin content, a large amount of stable foam is also easy to produce. In addition, if the slurry is not rinsed, the alkalinity will be higher and the added Improper control of chemical additives and auxiliary materials, pump or mechanical stirring of the slurry during transportation, natural impact caused by the drop, etc., will cause the slurry to dissolve into the air to generate bubbles, which will cause inconvenience to the washing and screening operations.

①During coating, due to the foaming of the coating, there will be no coating marks on the coated paper, which will affect the printing effect.

②Hinder the execution of process conditions and the normal operation of equipment

③When the foam is serious, it will increase the viscosity of the paint, make the fluidity of the paint worse, and bring difficulties to the production.

④During the processing of coated paper, if there is a large amount of foam at the storage tank and coating roller, the foam will overflow, which will affect the normal operation of coating, cause the loss of paint, and pollute the environment.

⑤Foam will also form floating pulp, which will cause clumps of paper material on the Internet, and cause broken ends

⑥There is foam in the paper material, which makes the concentration of the headbox fluctuate and the paper material flow is unstable; the micropores on the surface of the wet paper web are closed, which makes it difficult to dehydrate the wire and affects the uniformity of the paper web.

Foaming when the papermaking water is measured or discharged, which seriously affects the appearance.

1. Excellent defoaming and defoaming properties

2. Quickly and thoroughly improve filter drainage

3. It has good mutual solubility with black liquor and is suitable for the production conditions of pulp mills

4. Improve rinsing efficiency;

5. Contribute to the dehydration effect, reduce the moisture content of the pulp, and reduce the energy consumption of the evaporation process;

6. Reduce salt loss and improve the quality of pulp and paper;

7. Reduce the amount of bleaching chemicals to facilitate environmental protection requirements.

8. Biodegradable, non-toxic and harmless

Comparison of defoaming test

Formula selection

Name of defoamer: defoamer for papermaking

The ingredients are as follows: (For details, please consult the fine chemical engineer of Nanhui Defoamer: 0086 134 2860 1010)