Defoamer for Textile Industry

Textile printing and dyeing, also known as dyeing and finishing, is the process of giving colors/patterns to fabrics. It is also a general term for pre-treatment, dyeing, printing, finishing, washing, etc.

Textile printing and dyeing is one of the main application areas of defoamers.

The following picture is the current popular automatic printing and dyeing equipment: overflow dyeing machine

This equipment is highly automated and easy to operate. The fabric is in a slack state during dyeing, the tension is less, the dyeing is uniform, and the feel is soft.

It is mainly suitable for dyeing synthetic fiber knitted fabrics, stretch fabrics, and thin, loose, and elastic cellulose fiber products. At present, most printing and dyeing manufacturers use such dyeing equipment.

In addition to the direct addition of defoamers in the textile printing and dyeing process, defoamer also used in the production of textile auxiliary and the textile sizing process.

1) The role of the textile sizing agent is to improve the bundling of fibers in the yarn and increase the breaking strength; reduce the friction coefficient of the yarn surface and increase the wear resistance; make the sizing yarn flexible and bendable to adapt to the weaving deformation.

The material of the main slurry can be starch slurry or chemical slurry.

Starch pulp has good adhesion to natural fibers and film-forming properties. Sources are sufficient. No pollution to the environment, and easy to desizing.

But the procedure of preparing the slurry is more complicated. The starch slurry is not resistant to boiling and stirring, the viscosity of the slurry changes greatly, which affects the quality of the sizing, and it is not possible to sizing hydrophobic synthetic fibers alone.

Chemical pulp mainly includes acrylic pulp, water-soluble polyester pulp, and polyvinyl alcohol (PVA).

Acrylic sizing agent has strong adhesion to hydrophobic fibers, and has elasticity and softness to form a sizing film. It has certain antistatic properties, and is convenient for desizing, without environmental pollution.

However, the pulping is easy to foam, some varieties have large hygroscopicity, the hygroscopicity of the pulp film is strong, the viscosity is strong, and the pulp film is soft. Starch and PVA are mixed for various yarn sizing.

The water-soluble polyester pulp is easy to operate, non-toxic and tasteless, has little environmental pollution, has no residue in desizing, and has excellent biological explanation performance. Its disadvantages are low sizing rate and low desizing efficiency.

The viscosity of the polyvinyl alcohol slurry is stable, good acid and alkali resistance, high antimicrobial resistance, not easy to decay, good permeability, strong adhesion, good film performance, strong strength, good elastic elongation and buckling resistance, wear resistance Sex is good.

But there are also disadvantages, such as sizing is easy to foam, the standing surface is easy to skin, produce pulp spots, and yarn separation is difficult (cohesive strength is greater than the cohesion between the pulp film and the yarn), sometimes causing the tearing of the pulp film. Fiber adhesion is still not ideal, and there are environmental issues.

2) Textile pre-treatment is to remove impurities (natural impurities, artificial impurities) on the fabric.

The process of improving fabric finish, wettability, whiteness and dimensional stability.Including cotton fabric singeing, desizing, scouring, bleaching, mercerizing and other processes, as well as desizing, de-sizing, pre-shrinking and alkali reduction of chemical fiber fabrics.

Mercerization is to use concentrated alkali solution to treat cotton woven fabrics, the surface of which shows a silky luster, and more importantly, its dimensional stability is improved, that is, the cotton woven fabrics are set.

The following two pictures are mercerized machines

  In the entire textile printing and dyeing process, due to the high temperature (generally in a 100 degrees Celsius high-temperature alkaline environment) and the addition of active substances in various additives, and foam problems are easy to occur, it will cause quality problems like color spots, white spots, uneven color in the textile fabric, etc., Even leads to uneven color patterns and blurry patterns of textile products, which seriously affects product quality and hinders production progress.

For such reasons, defoamers are necessary for the textile industry.

The use system requires that the defoamer used is resistant to high temperatures, has good anti-attenuation performance, and has stable chemical properties.

 Seraph has over ten years of experience in foam control processing in the textile industry. The defoaming products developed by our team have excellent defoaming and antifoaming performance and attenuation in high temperature and alkaline environment. The product quality is comparable to that of major famous brands.

 Please contact us for suitable product recommendations.