Analysis Of The Testing Process Of Low-melting Polyester Fiber

Low-melting polyester fiber is widely used in textile, non-woven and composite materials due to its excellent bonding performance and processing convenience. To ensure that the product quality meets international standards, its testing process needs to be strictly regulated. The following are the main testing links and key points of low-melting polyester fiber.

Appearance and physical property testing

First, the fiber is visually inspected, including color uniformity, presence of impurities or broken filaments. The linear density (fineness) of the fiber is then measured to ensure that it meets the specification requirements. In addition, the length distribution of the fiber needs to be tested to ensure its spinnability and uniformity in subsequent processing.

Melting point and thermal performance analysis

The core characteristic of low-melting polyester fiber is its low melting temperature. Through differential scanning calorimetry (DSC) or thermogravimetric analysis (TGA), its melting temperature range is accurately determined to ensure that it can stably melt at the processing temperature while avoiding high-temperature decomposition. Thermal shrinkage testing is also a key link to evaluate the dimensional stability of the fiber after heating.

Mechanical properties test

The tensile strength, elongation at break and other mechanical indicators of the fiber directly affect its application performance. A universal material testing machine is used to perform single fiber tensile tests to ensure that its strength meets the downstream processing requirements. In addition, the curling properties of the fiber need to be tested, which is crucial for the fluffiness and resilience of products such as non-woven fabrics.

Chemical composition and environmental indicators

The chemical structure of the fiber is analyzed by infrared spectroscopy (FTIR) or nuclear magnetic resonance (NMR) to confirm that its polyester component meets the standards. At the same time, the heavy metal content and residual harmful substances are tested to ensure that the product meets the requirements of international environmental regulations such as REACH and RoHS.

Conclusion

The testing process of low-melting polyester fiber covers multiple dimensions such as appearance, physical properties, thermal properties and chemical safety. Strict testing not only ensures product quality, but also provides reliable technical support for downstream applications. With the continuous improvement of industry standards, a scientific testing system will become an important manifestation of corporate competitiveness.