Quality Inspection Process of Professional Polyester Twisted Yarn Manufacturer

In the modern textile industry, quality is no longer just a question of whether it is qualified or not, but the core of brand value and market competitiveness. As the basic material in the fields of cloth, shoe materials, decorative fabrics, etc., the stability, strength and consistency of polyester twisted yarn are directly related to the performance and service life of downstream products.

For professional polyester twisted yarn manufacturers, such as Sinrylion, building a complete quality inspection system is the key to product refinement and standardization. This article will deeply analyze the various quality control nodes in the entire process of polyester twisted yarn manufacturing, revealing how a mature manufacturer ensures the excellent quality of each fiber.

Raw material inspection: the first checkpoint of quality control

The birth of a high-quality product begins with the first batch of raw materials entering the factory. For polyester twisted yarn, the raw material is usually polyester filament (such as FDY or DTY), and its performance will directly affect the subsequent twisting stability and yarn performance.

How to check the raw materials?

Supplier screening mechanism

Professional manufacturers will establish a list of qualified raw materials for long-term cooperation, conduct qualification review and sample verification of raw material suppliers, and ensure the reliable source of raw yarn.

Key performance testing

• ● Line density consistency: keep the thickness of each yarn stable to ensure uniform subsequent twisting.
• ● Breaking strength and elongation: reflect the toughness and elasticity of the fiber, and are the basis for the durability of the product.
• ● Oil content and oil type: affect the processability and static level of the yarn.
• ● Color gloss consistency: related to the aesthetics of the final product.
• ● Impurity content and dryness: affect the stability of subsequent twisting and hairiness control.

Line density meters, electronic tensile machines, infrared oil content meters and other equipment are usually used for random inspections. Only when the raw materials are qualified can they be allowed to enter the next process flow.

Online monitoring of the twisting process: the key to building high consistency

Twisting is the core link in the formation of polyester yarn performance, and its process control directly determines the physical properties and stability of the finished product. In this link, the online detection system is particularly important.

Which links are most likely to go wrong?

• ● Unstable tension: Too high tension is easy to break the yarn, and too low tension will cause looseness and skipping. Real-time monitoring through tension sensors is the key to stable quality.
• ● Fluctuation of twisting turns: The number of twisting turns affects the structure and elasticity of the yarn, and needs to be regularly calibrated by the twisting degree controller.
• ● Uneven winding: If the yarn is not wound neatly, it will affect the packaging and subsequent use, and even cause winding and yarn breakage.

Actual method of process monitoring:

• ● Use a digital twisting machine combined with a tension control system to ensure consistent yarn process status.
• ● Real-time recording of parameters such as twisting tension, breakage rate, and yarn path tension is convenient for subsequent data analysis and traceability.

In addition, controlling the temperature and humidity of the twisting workshop (generally controlled at 20-25°C and humidity of about 60%) is also an important condition for maintaining production stability.

Finished product inspection: Comprehensive verification of product compliance and consistency

Finished product inspection is the last checkpoint of quality control. It not only verifies the effectiveness of the previous processes, but also directly affects the customer's experience of the product.

Appearance inspection - the first impression determines trust

• ● Neat winding, full bobbin, no messy yarn, no skipping
• ● Consistent color, no oil spots, stains or obvious color difference
• ● Packaging specifications, labels, batches, weight and other information are complete and correct

Performance testing - determines whether it can be put into use smoothly

These data will be compared with standard process values or customer indicators to determine whether they are qualified. Sinrylion will flexibly adjust the focus of testing according to the use of the product. For example, the yarn used for sports shoe uppers emphasizes tensile resistance and elasticity.

Testing equipment and standard system: Science is the guarantee of quality

A mature quality system cannot be separated from equipment support and standard system.

Recommended testing equipment includes:

• ● Electronic tensile tester: test breaking strength and elongation
• ● Automatic twisting tester: used to quickly measure twisting degree
• ● Infrared oil content analyzer: accurately detect oil content
• ● Feather testing equipment: measure hairiness density and length
• ● Hot air oven: measure thermal shrinkage and test dimensional stability

Common industry standards:

• ● GB/T 14344: National standard for polyester filament
• ● GB/T 3916: Test method for twisting degree
• ● ISO 2062: Yarn breaking strength and elongation test
• ● OEKO-TEX Standard 100: Eco-textile certification standard (applicable to export or environmental protection fields)

Through these standardized tools and methods, manufacturers can ensure that the testing process is scientific and the results are stable.

Practical suggestions for building a complete quality management system

Testing is only part of quality management. What is more important is to build a stable, efficient and sustainable system.

Practical suggestions:

• ● Through-type quality management mechanism:From the entry of raw materials to the exit of products, each link must have a detection node to form a three-level defense line of "front-middle-back".
• ● Introduce a digital quality platform:Record production and testing data through the MES system, automatically generate quality reports, and realize abnormal warning and trend analysis.
• ● Multi-skill training for quality inspectors:Not only can it improve efficiency, but it can also detect potential quality risks in a timely manner.
• ● Customer-participated quality control collaboration:Actively invite customers to participate in some quality inspection processes and share inspection data, which will help improve trust and repurchase rate.
• ● Continuously optimize process standards:Establish a quality improvement mechanism, such as "monthly defect review meeting", and continuously revise the process and upgrade the inspection process.

Are you looking for affordable polyester twisted yarn? You have come to the right place. We are committed to providing our customers with quality products and the best value. Your satisfaction is our motivation. Send an email to janekwok@xll-group.com today and our manufacturer will be happy to serve you.

Although polyester twisted yarn is small, it is the "microscopic skeleton" of the fabric world. To produce high-quality yarn, manufacturers need to invest professionalism, precision and responsibility in every link. The reason why mature Polyester twisted yarn manufacturers such as Sinrylion stand out in the industry is that they have integrated quality management into their corporate genes.

The testing process is not an independent system, but a solemn promise made by the company to its customers. Continuously optimizing the quality system can not only reduce the defective rate and complaint rate, but also create long-term trust and brand moat. I hope this article will provide a clear and practical reference for industry practitioners, and help everyone to jointly promote China's textile manufacturing towards high quality, high efficiency and high standards.