How to ensure that the pH value of dyed socks reaches the optimal standard

How to ensure that the pH value of dyed socks reaches the optimal standard

Introduction
During the sock production process, the dyeing process is crucial, and the pH value of dyed socks is one of the key factors affecting product quality and consumer health. For international wholesale buyers, ensuring that the pH value of the purchased socks meets the standard is an important part of ensuring product quality and market competitiveness. This article will explore in depth how to ensure that the pH value of dyed socks reaches the optimal standard and provide professional guidance for your socks independent station business.

1. The importance of pH value to socks
Affecting wearing comfort: The pH value of human skin is usually around 5.5, which is weakly acidic. When the pH value of socks is too high or too low, it will irritate the skin, causing itching, redness and swelling and other discomfort symptoms, affecting the wearing experience.
Relationship with product durability: Inappropriate pH value may destroy the structure of sock fibers, reduce their strength and elasticity, make socks more easily worn and deformed during wearing, and shorten the service life of the product.
Health and safety: If the pH value of socks exceeds the reasonable range, bacteria, fungi and other microorganisms may breed and cause skin diseases, especially for children, the elderly and people with sensitive skin, the potential risk is greater.

2. pH value standard of socks
Domestic standard: According to the national standard GB 18401, the pH value of textile products that directly contact the skin should be between 4.0-7.5; the pH value of products that do not directly contact the skin should be between 4.0-9.0.
International standard: In international markets such as Europe and the United States, the pH value requirements for textiles are usually more stringent. For example, the AATCC 61 standard in the United States stipulates that the pH value of textiles should be between 4.0-7.5; the EU EN 301/302 standard also requires that the pH value of textiles should be close to neutral to reduce skin irritation.

3. Factors affecting the pH value of socks after dyeing

Choice of dyes and auxiliaries: Different dyes and auxiliaries contain different chemical components, and their own pH values ​​and effects on the pH value of socks are also different. For example, acid dyes will reduce the pH value of socks, while alkaline auxiliaries may cause the pH value to increase.

Dyeing process: The temperature, time, bath ratio and other process parameters in the dyeing process will affect the pH value. Too high or too low temperature, too long or too short time may cause the dye and auxiliaries to not fully react or over-react, thereby affecting the pH value of socks.

Water quality issues: If the pH value of the dyeing water is unstable or contains more impurities, it will directly affect the dyeing effect and the pH value of the socks. Calcium, magnesium and other ions contained in hard water may react with the dye to produce precipitation, affecting the control of pH value.

4. Methods to ensure that the pH value of socks reaches the best standard after dyeing
Selection and control of raw materials
Optimize dyes and auxiliaries: Select dyes and auxiliaries of qualified quality and environmental protection, and fully understand their characteristics and impact on pH value. When purchasing, check the relevant product quality test reports and certification certificates to ensure that they meet international standards and environmental protection requirements.
Ensure qualified water quality: Use softened water or treated pure water for dyeing to avoid impurities in the water from adversely affecting dyeing and pH value. Regularly test and maintain water quality to ensure stable and reliable quality of dyeing water.
Optimize dyeing process
Strictly control process parameters: Accurately control dyeing temperature, time, bath ratio and other parameters according to process requirements to ensure that dyes and auxiliaries can fully and evenly combine with sock fibers, thereby achieving effective control of pH value. During the production process, it is necessary to strengthen the monitoring and recording of process parameters to promptly discover and correct deviations.
Reasonably adjust pH value: During the dyeing process, add appropriate amounts of acid or alkali in a timely manner according to actual conditions to adjust the pH value so that it always remains within the appropriate range. For example, when dyeing with acid dyes, an appropriate amount of sodium acetate can be added to increase the pH value; when using alkaline additives, an appropriate amount of glacial acetic acid can be added to reduce the pH value.
Strengthen pH monitoring during production
Equipped with accurate testing equipment: Use a pH meter or pH test paper with high accuracy and good reliability to regularly test the pH value of the dye solution and finished socks during the dyeing process. When selecting testing equipment, ensure that its measurement range and accuracy can meet production requirements, and calibrate and maintain it regularly to ensure the accuracy of the test results.
Establish a complete testing system: formulate strict quality testing processes and standards, clearly perform pH testing at key links such as before and after dyeing and before and after drying, and keep good test records. For products that fail the test, rework should be carried out in a timely manner to ensure that the pH value of each batch of socks meets the standard requirements.
Pay attention to the finishing link
Fully wash: The dyed socks should be fully washed to remove residual impurities such as dyes and additives to reduce their impact on the pH value. During the washing process, the water temperature and time should be controlled.