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عربىWe need to understand the basic properties of polyester fiber. Polyester has excellent heat resistance and maintains good performance over a wide temperature range. Its melting point is relatively high, usually between 255°C and 265°C, so it is not easily deformed or melted in high temperature environments. At the same time, it also has excellent light resistance and can resist ultraviolet radiation in sunlight for a long time without aging easily. Polyester fiber has high strength and elasticity, especially its high tensile strength and good wear resistance. This makes polyester fiber products less likely to break during long-term use and maintain better shape and appearance. Polyester fiber has good resistance to most acids, alkalis and organic solvents and is not easily eroded by these substances. This characteristic makes polyester fiber widely used in chemical, medical and food packaging and other fields.
When Polyester Fabric is exposed to high temperatures, it first undergoes a series of thermodynamic changes. As the temperature gradually increases, the polyester fiber begins to transform from a glassy state to a highly elastic state. During this process, the fiber's molecular segments gradually begin to gain enough energy to undergo larger vibrations and movements. This transition typically occurs near the glass transition temperature (Tg), which for polyester fibers is approximately 70°C to 80°C. When the temperature further increases and exceeds the glass transition temperature, the molecular chain movement in the polyester fiber will become more intense. At this time, the molecular chains in the amorphous region inside the fiber begin to move violently, and the interaction between molecules is gradually broken up, making the texture of the fiber begin to soften. When the temperature reaches 230°C to 240°C, polyester fiber will enter the softening stage. At this stage, the movement of molecular chains in the amorphous region of the fiber intensifies, the forces of intermolecular interaction are dissipated, and the fiber only softens rather than melts. However, at this point the fiber has begun to lose its original shape and may undergo a certain degree of deformation.
As the temperature further increases, Polyester Fabric begins to enter the softening stage. When the temperature reaches 230°C to 240°C, the molecular chains in the amorphous region inside the fiber begin to move violently, the interaction between molecules is gradually broken up, and the fiber exhibits characteristics similar to a viscous flow state. At this time, the texture of Polyester Fabric begins to soften and may deform to a certain extent. However, because the molecular chains of the polyester fiber's crystalline region remain relatively stable, the fiber does not melt completely.
When the temperature continues to rise to the melting point of polyester fiber (about 255°C to 265°C), the molecular chains in the crystalline region inside the fiber also begin to move, and the fiber eventually melts completely. At this time, Polyester Fabric has lost its original fiber structure and turned into a liquid substance. However, in practical applications, polyester fibers rarely reach such high temperatures, so melting is uncommon.
In addition to temperature factors, the performance of Polyester Fabric at high temperatures is also affected by other environmental conditions. For example, factors such as fiber moisture, air flow speed and pressure can all affect the degree to which the fiber melts or deforms. In addition, Polyester Fabric may be subject to forces such as heat treatment, stretching and compression during processing, and these forces may also affect the melting or deformation of the fiber.
In practical applications, Polyester Fabric is usually used to make various clothing, household items, and industrial products. In these applications, Polyester Fabric needs to withstand varying degrees of heat treatment and processing. In order to ensure the stability and durability of Polyester Fabric at high temperatures, manufacturers usually use appropriate heat treatment methods, such as heat setting, heat shrinkage, etc., to improve the performance and appearance of the fiber. In addition, manufacturers also need to conduct strict quality control on Polyester Fabric to ensure that it meets relevant standards and requirements.
