By Baico Biotech 丨 Textile Enzyme 丨 BIO-SCOURING ENZYME

Unlike knitted fabrics, the warp yarns of woven fabrics are subjected to intense mechanical forces during weaving. Prior to weaving, warp yarns must be sized to improve their mechanical strength and prevent yarn breakage. The sizing agents commonly adopted are low‑cost substances such as starch and polyvinyl alcohol (PVA). The resulting grey fabric carries residual size, which exhibits poor water absorbency (capillary effect), stiff hand‑feel and uneven dye uptake. Consequently, de-sizing of woven fabrics is mandatory prior to dyeing and finishing to ensure smooth execution of subsequent processes.

Conventional de-sizing predominantly adopts alkaline de-sizing with caustic soda. Sizing agents swell and dissolve in alkaline solution. Nevertheless, these chemical agents lead to high production costs as well as heavy wastewater‑treatment expenses. Owing to the high efficiency and substrate specificity of enzymes, amylaseis well‑suited for de-sizing of starch‑based sizes. It possesses high heat resistance and can exert its function under high-temperature conditions. Among various amylases, α‑amylase is most commonly used in de-sizing processes. It can hydrolyze the α‑1,4‑glycosidic bonds of amylopectin or amylose to form maltose, maltotriose, dextrin, glucose, etc. Compared with conventional de-sizing processes, enzymatic de-sizing features mild reaction conditions and environmental friendliness.

For the de-sizing of starch‑sized woven fabrics, Baico Biotech has launched the RF838‑W product to fulfil this requirement. Baico Biotech (BBT) is textile enzyme and household detergent enzyme manufacturer in China. RF838-W containing amylase and pectinase, this product enables enzymatic de-sizing and bio‑scouring to proceed simultaneously. Amylase focuses on removing starch size from the fabric surface, while pectinase targets impurities such as pectin. Mainly relying on the synergistic effect of the two enzyme components, it eliminates cumbersome conventional procedures and greatly simplifies the pre‑treatment process. Under mild conditions of 55°C and near‑neutralpH, fiber properties are well preserved and even improved. Both the capillary effect and fabric cleanliness are enhanced.

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