The PH value is a very important quality indicator for textiles, and it is a mandatory indicator of the GB18401-2010 "National Basic Safety Technical .Specifications for Textiles." Unqualified PH value is also the most common quality problem in the textile processing, production and trade process, which is increasingly causing People's attention.

Human skin is weakly acidic. If the PH value of the textile is between slightly acid or neutral, it will help protect human health under such environmental conditions, it can prevent the invasion of germs; on the contrary, the textile pH value is too high or too low will destroy the balance and resistance of the skin can cause skin allergies or induce infections and cause germs to invade.

The main causes of abnormal pH are insufficient PH control of textiles during dyeing and finishing, insufficient acid neutralization after wet treatment, or incomplete cleaning. The dyeing and finishing processes that easily cause abnormal PH are mainly alkali reduction, polyester printing water washing, and reactive printing. washing, desizing, scouring and mercerizing of cotton clothes .

Comparison of Different Methods of Measuring PH Value of Textiles

If the PH of the fabric or garment is unqualified, the PH of the fabric is generally adjusted through the principle of acid-base neutralization. The unqualified pH is mostly alkaline. There are many kinds of acid agents that can be used to adjust. The most common are glacial acetic acid and citric acid. Glacial acetic acid is volatile and has a pungent odor. Citric acid is relatively stable when adjusting the pH. It is generally recommended to use citric acid for adjustment, but pay attention to controlling the dosage. Excessive amount will affect the feel and easily cause yellowing.

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