Polypropylene superfine denier fiber refers to a differentiated fiber with a single filament fineness far lower than that of conventional polypropylene. Due to its soft fiber bundles, large specific surface area and strong capillary effect, it has irreplaceable advantages in high-end clothing, high-precision filtration, high-grade wiping cloths and other fields. However, its production places extremely high demands on process technology, and optimization is the core to ensuring product quality and performance.
I. Precise control of spinning and drawing processes
The primary difficulty in the production of Polypropylene superfine denier fiber lies in the refinement and uniformity control of the fibers. During the melt spinning stage, there are strict requirements for the melt index and molecular weight distribution of polypropylene raw materials, and it is necessary to ensure that the melt has excellent rheological properties and thermal stability. By adopting precise filtration technology and static mixers, ensuring the purity of the melt and uniformity of temperature is the foundation for preventing broken threads and frayed threads. During the stretching process, the temperature and speed gradients of the multi-stage hot rollers need to be precisely set to achieve the smooth orientation and crystallization of the molecular chain and avoid fiber defects caused by stress concentration. Optimizing the side-blowing air process and ensuring the stability of cooling air velocity and temperature are the keys to controlling the pre-orientation degree of nascent fibers and achieving uniform fineness.
Ii. Modification Additives and Functionalization Integration
To achieve high quality and functionalization of Polypropylene superfine denier fiber, masterbatch addition technology is of vital importance. The introduction of efficient spinning oil agents can effectively reduce the friction coefficient of fibers, enhance bundling properties, and ensure the spinnability of subsequent textile processing. By blending and adding antistatic agents, light stabilizers or specific color masterbatches, fibers can be endowed with lasting antistatic, anti-aging or original liquid coloring functions at the spinning source, avoiding damage to the fiber structure caused by post-treatment. This is particularly important for maintaining the soft hand feel and mechanical properties of superfine fibers.
Iii. Production Stability and Quality Control
The production of Polypropylene superfine denier fiber is extremely sensitive to the precision of equipment and the cleanliness of the environment. Establishing a full-process online monitoring and automatic control system to monitor key parameters such as melt pressure, pressure drop of spinning components, and drawing ratio in real time is the guarantee for achieving stable production. Meanwhile, strict testing of the CV value of fineness, strength, elongation and other indicators of the finished filament is an important basis for optimizing the process and closed-loop feedback.
Zhejiang Xuri Fiber Co., Ltd. was founded in 1990 and is a high-tech enterprise integrating R&D, production and sales. The company adheres to the business philosophy of "Everything for the customer, everything for the customer", and takes "self-improvement and striving for excellence and strength" as its corporate spirit. Adhering to the business policy of "mutual benefit, mutual advantage and mutual trust", we strive to create a harmonious, warm and vibrant Dongsheng Xuri.
