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How is the quality of recycled polyester staple fiber ensured?

2025-05-13

Raw material selection: The quality of recycled polyester staple fiber highly depends on the quality of the raw materials. High - quality waste polyester products, such as discarded PET bottles and textile waste, should be selected. These raw materials should be free from excessive contamination, have a relatively uniform composition, and a high content of polyester. For example, when collecting waste PET bottles, those with labels and caps removed are preferred to reduce impurities.
Production process control
- Sorting and cleaning: The collected waste polyester materials are first sorted to remove non - polyester materials and impurities. Then, they are thoroughly cleaned to remove dirt, grease, and other contaminants. This step is crucial as any remaining impurities can affect the quality of the final product. For example, using high - pressure water jets and specialized cleaning agents can effectively clean the surface of waste polyester bottles.
- Melting and extrusion: The sorted and cleaned waste polyester is melted at a suitable temperature. The melting temperature and time should be strictly controlled to ensure the uniformity of the molten material. Then, the molten polyester is extruded through a spinneret to form fibers. The extrusion process should maintain a stable pressure and flow rate to ensure the consistency of the fiber diameter and shape.
- Drawing and texturing: The as - spun fibers are then drawn to increase their strength and orientation. The drawing ratio and temperature should be optimized to achieve the desired mechanical properties of the fibers. After drawing, texturing can be carried out to give the fibers a certain degree of crimp and softness, improving their textile - processing performance.
Quality testing: Comprehensive quality testing is essential to ensure the quality of recycled polyester staple fiber.
- Physical property testing: This includes testing the fiber's length, fineness, strength, elongation, and bulkiness. These properties affect the fiber's processing performance and the quality of the final product. For example, the strength and elongation of the fiber should meet certain standards to ensure that the textile products made from it have sufficient durability.
- Chemical property testing: The chemical composition of the recycled polyester staple fiber should be analyzed to ensure that it meets the requirements of polyester. Impurities and additives should be within the allowable range. In addition, the thermal stability and dye - ability of the fiber are also important chemical properties to be tested. For example, good dye - ability ensures that the fiber can be dyed into various colors evenly.
- Appearance quality inspection: The appearance of the fiber, including its color, luster, and the presence of defects such as knots and breaks, should be inspected. A uniform color and luster, as well as the absence of obvious defects, are important indicators of good - quality fibers.

In addition, continuous improvement of production technology and equipment, as well as strict implementation of quality management systems and relevant standards and regulations, are also important guarantees for ensuring the quality of recycled polyester staple fiber.

HUAHONG INDUSTRIAL PARK, ZHOUZHUANG TOWN, JIANGYIN CITY, JIANGSU PROVINCE, CHINA E-mail: andy.jin@huahongfiberchina.com Tel: 86-13861611428 Tel: 86-13861611428

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