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What Are The Procedures For Pre-treatment Of Polyester Fabrics?

Aug 22, 2019

Here is a Plain Weaving Polyester Fabrics Factory talking about the procedures for pre-treatment of polyester fabrics.

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Plain Weaving Polyester Fabrics

Plain Weaving Polyester Fabrics

The pretreatment of polyester fabric, in the dyeing and finishing process of polyester products, the polyester pretreatment includes desizing, squeezing, creping, reduction, shaping and other processing techniques, which are respectively introduced below.

Under normal circumstances, the desalting pH of the polyester slurry is controlled at 8, the polyacrylate slurry is 8 to 8.5, the polyvinyl alcohol slurry is 6.5 to 7, and the fabric woven by the water jet loom needs to be desalted with caustic soda.

The selection of desizing agents, scouring agents and the determination of desizing and scouring methods are the key to the desizing and refining process. Different desizing agents should be selected according to the type of pulp on the fabric. The commonly used desizing agents are sodium hydroxide or soda ash. Because of the commonly used acrylate syrups, whether soluble or insoluble, they can be dissolved and removed by the action of an alkali agent to become a soluble sodium acrylate salt. For pva or cmc type slurry, the action of hot alkali can increase the expansion of the slurry, so that the force between the slurry and the fiber is reduced. Under the action of mechanical force, the slurry is easily separated from the fiber; on the other hand, the alkali is also Can increase the solubility of the slurry. The base can also be removed by saponifying a part of an oil agent such as a greased oil or a higher fatty acid ester into a water-soluble substance.

The first is the desizing and scouring processing method and process. The commonly used slurry for polyester weaving is polyacrylate, which is an acrylate copolymer slurry. Since the slurry contains an ester group-ooor, it has a certain similarity to the polyester molecule containing the same group, so it has a strong affinity for polyester. Polyester itself does not contain impurities, but only a small amount (about 3% or less) of oligomers are present during the synthesis, so unlike the cotton fibers, strong pretreatment is required. As a desizing and scouring process, the main purpose is to remove the oil agent added during the manufacture of the fiber, the slurry added during weaving, the coloring dye, and the oil stains and dust stained during transportation and storage, so the desizing and scouring task is light and the condition Gentle, simple process. However, if the polyester fabric is uncleaned or not desalted, the alkali reducing liquid component is unstable, the pH value is difficult to control, the reduction effect is reduced, uneven reduction, uneven dyeing or color point and color are produced. Flowers and other diseases. Therefore, these impurities must be exhausted to ensure the smooth progress of the subsequent processes.

The removal of good smoothing agents requires the use of surfactants (mainly anionic and nonionic), through their wetting, infiltration, emulsification, dispersion, solubilization, washing, etc., oil and oil from fibers and fabrics Removed.

In addition, in order to avoid the incorporation of metal ions with a slurry, an oil agent or the like to form an insoluble substance, it is also necessary to add a metal complexing agent or a metal ion blocking agent during scouring.

The desizing process is actually a washing process, and of course there are sometimes chemical reactions. Usually, the desizing and scouring is immersed for a long time at a high temperature, and impurities, dirt, and the like of the slurry and the oil are dissolved, emulsified, dispersed, and removed.

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