Polypropylene Superfine wire, as a high-end product in the field of synthetic fibers, occupies an important position in the field of functional textiles due to its unique preparation process and outstanding performance. Its preparation process uses polypropylene as the raw material and achieves a breakthrough in fineness through precise control in multiple links.
The preparation process of Polypropylene Superfine wire:
Firstly, during the raw material preparation stage, polypropylene needs to be modified by adding antioxidants, antibacterial agents and other additives to enhance the performance of the fibers. Subsequently, in the melt spinning process, high-temperature and high-pressure conditions are adopted to extrude the polypropylene melt through a microporous spinneret, forming primary fibers with a single filament fineness lower than 0.55dtex. During this process, the side-blowing air cooling technology is of vital importance. It is necessary to precisely control the wind speed and temperature gradient to ensure the uniform and stable crystalline structure of the fibers.
In the post-processing stage, stretching and networking processes are the keys to improving the performance of fibers. Through multi-stage stretching equipment, the molecular orientation and crystallinity were optimized in a hot box at 120-130℃, increasing the fiber strength to 3.5-5.5g/d and stabilizing the elongation at break at 15-35%. The network device forms a uniform fiber network structure by adjusting the processing speed and stretching ratio, effectively reducing the occurrence of filaments and broken ends. The overfeed control system precisely adjusts the roller speed difference to ensure the stability of the filament tension and guarantee the network effect and opening degree.
In terms of performance advantages, Polypropylene Superfine wire filament has demonstrated multiple breakthroughs. Its specific gravity is only 0.91, which is over 40% lighter than cotton fibers, endowing the fabric with an extremely lightweight experience. The natural thermal insulation coefficient reaches 0.034W/m·℃, surpassing the 0.031W/m·℃ of wool. It maintains stable performance even at extreme temperatures ranging from -70℃ to 150℃. The unidirectional moisture-wicking function is achieved through the capillary network structure on the fiber surface, which can quickly conduct sweat from the skin surface to the outer layer of the fabric for evaporation, keeping the skin dry. Its antibacterial properties stem from its hydrophobic surface, which does not absorb moisture or sweat and effectively inhibits bacterial growth. In addition, the original liquid coloring process achieves dye-free production, reducing wastewater discharge by over 80% compared to traditional dyeing processes, and meets the requirements of environmental protection and degradability.
With these advantages, Polypropylene Superfine wire is widely used in high-end textile fields such as sportswear, underwear and swimwear, and has become an ideal choice for the development of functional fabrics.
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