The quality of polyester staple fibers can be evaluated according to physical properties, chemical properties and appearance defects. Generally divided into excellent, one, two, three and so on. The classification items and specific indicators of various chemical fibers are different and are specified in the inspection standards.

The physical and chemical properties of polyester staple fibers generally include the breaking strength and its coefficient of variation, elongation at break, linear density deviation, length deviation, ultra-long fiber ratio, long fiber content, number of crimps, and oil content.

According to the characteristics of polyester staple fiber, its index should be tested. It is necessary to test the wet breaking strength, residual sulfur content, whiteness and oily yellow fiber; check the crimp ratio, specific resistance, dry heat or boiling water shrinkage; etc.; 10% fixed elongation strength is required; the requirement is within the specified range.

The quality inspection of polyester staple fiber was randomly sampled by batch. The same batch of fiber has the same raw materials, the same process conditions, and the same product specifications. The number of samples is based on the batch size as specified by the standard.

Hai'an County Qinfeng Chemical Fiber Co., Ltd. is a company specializing in the production, research and development and sales of polypropylene staple fiber, polyester staple fiber, Functional polypropylene staple fiber and PP staple fiber. It is based on innovation and sets a good example for the industry. Its main specifications are 1.5D to 200D and the length is 5-150mm. The products are available in a wide range of colors and support color to map or sample customization. Qinfeng will always adhere to the business philosophy of “pursuing excellence and creating brilliance”. We sincerely look forward to your call!

For more product information, please contact: Mr. Qian 13962787918, 13813743991 Website: http://www.glory-fiber.com/