Polyester interlining: the leader in wrinkle resistance - revealing its chemical structure and physical properties

In the textile industry, interlining is an important auxiliary material for clothing, home decoration and various textiles. Its performance is directly related to the quality and comfort of the final product. Among the many interlining materials, polyester interlining stands out with its excellent wrinkle resistance and becomes a popular choice in the market. This excellent performance is inseparable from the unique chemical structure and physical properties of polyester fiber.

1. Chemical structure of polyester fiber: tight and orderly, laying a solid foundation
Polyester, scientifically known as polyester fiber, is a polymer fiber made by chemical synthesis. Its core lies in its molecular chain structure, which is tight and neatly arranged, forming a highly ordered internal structure. The polyester molecular chain is mainly composed of terephthalic acid and ethylene glycol condensation. This polymerization reaction forms a strong covalent bond between the molecular chains, giving the fiber the characteristics of high strength and high modulus. This tight and orderly structure, like a solid skeleton, supports the polyester fiber, allowing it to maintain a stable shape and not easily deformed when facing external forces.

In addition, the molecular chain of polyester fiber also contains ester group (—COO—). The presence of this functional group not only enhances the interaction between molecular chains, but also makes polyester fiber have a certain chemical corrosion resistance, can maintain stable performance under various environments, and further extend the service life of polyester interlining.

2. Physical properties: elastic recovery, the key to anti-wrinkle performance
The physical properties of polyester fiber are a direct reflection of its anti-wrinkle performance. Thanks to its tight molecular chain structure, polyester fiber exhibits excellent elasticity. When polyester interlining is subjected to external force, such as sewing, ironing or stretching during wearing, its molecular chain will deform to a certain extent, but once the external force is removed, the molecular chain can quickly return to its original arrangement state. This process is called elastic recovery.

This rapid elastic recovery ability enables polyester interlining to maintain good flatness after multiple deformations and is not easy to form permanent wrinkles. In contrast, natural fibers such as cotton and linen, due to their relatively loose molecular chain structure and weak elastic recovery ability, are prone to wrinkles under external force and are difficult to recover on their own.

3. Advantages in practical applications
The excellent performance of polyester interlining in wrinkle resistance makes it widely used in many fields such as clothing and home decoration. In clothing production, polyester interlining can effectively improve the stiffness and shape retention of clothing, so that the clothing can maintain its original shape and texture even after multiple washing and wearing. Especially in high-end clothing such as suits and coats that need to maintain a good version, the application of polyester interlining is particularly important.

In the field of home decoration, polyester interlining is often used as the lining of soft furnishings such as sofa covers and curtains. Its wrinkle resistance ensures the flatness and beauty of soft furnishings, and it is not easy to deform after long-term use, which greatly extends the service life of the product.

4. Environmental protection and sustainable development trend
With the improvement of environmental awareness, the production of polyester fibers is also developing in a greener and more sustainable direction. By adopting bio-based raw materials and improving production processes, energy consumption and environmental pollution in the production process can be reduced, so that polyester interlining can meet high performance requirements while also meeting the environmental protection concept of modern society.