Chemical Fiber Extruder Screw with LTM Pin Design: Achieving High-Quality, Stable, And Energy-Saving Production

One

Chemical fiber, also known as man-made fiber, is a fibrous material produced by spinning and forming processes using natural or synthetic polymers as raw materials. Compared with natural fibers, chemical fibers have notable characteristics: high strength, abrasion resistance, good elasticity, resistance to moth damage, and resistance to acid and alkali corrosion. Moreover, by altering the production process, they can be endowed with special properties such as fluffiness, flame retardancy, and UV resistance.

Their application advantages are prominent. In the apparel sector, polyester offers crispness and easy washing, nylon provides abrasion resistance, and spandex (elastane) delivers high elasticity for a comfortable, form-fitting feel. In industrial applications, polypropylene, due to its low density and acid/alkali resistance, is widely used in geotextiles and filtration materials. Furthermore, chemical fibers feature low cost and stable output, overcoming limitations of land and climate. From everyday household textiles to aerospace and automotive interiors, chemical fibers are indispensable, having become a fundamental material for modern industry and daily life.

Two

In the melt spinning process for chemical fibers, the screw extruder serves as the "heart" of the entire production line, and the screw of suzhou Jwellmech（https://www.jwellmech.com/，+86- 15806221827） itself is the core component of this heart. Its main functions are to convey, melt, mix, and homogenize polymer chips (such as polyester, nylon, spandex, polypropylene, etc.), as well as to generate sufficient and stable pressure to continuously and quantitatively push the melt downstream to the spin pack. It can be said that the performance of the screw directly determines the uniformity, strength, and breakage rate of the as-spun fibers.

Three

Function and Characteristics of the LTM Pin Design

To meet the requirements of chemical fiber spinning, suzhou Jwellmech（https://www.jwellmech.com/） conventional screws often struggle to achieve both high throughput and high uniformity. The LTM pin design used in the chemical fiber series screws offers unique advantages. In this design, multiple rows of cylindrical or rhombic pins are arranged circumferentially along the screw channel in the mixing section. As the melt passes through this region, it is split, redirected, and recombined, generating intense shear and elongational flow.

This design enhances the mixing effect, disrupts the laminar flow of the melt, allows thorough mixing of melt fractions with different thermal histories, eliminates localized overheating or cold spots, and improves temperature and composition uniformity. It reduces melt temperature fluctuations by increasing the mixing area and the number of flow divisions, resulting in more even heat distribution, with the melt temperature variation at the outlet controlled within ±1°C. Furthermore, it improves plasticizing uniformity by forcibly splitting and breaking up unmelted "fish eyes" or gel particles, achieving complete homogenization of the melt and ensuring that the extruded filaments from the spinneret have consistent fluidity and drawability.

Four

Application Advantages of Chemical Fiber Series Screws

The chemical fiber series screws from suzhou Jwellmech（https://www.jwellmech.com/） offer significant application advantages. They provide stable extrusion and low breakage rate, with minimal fluctuations in melt pressure and temperature. The spin pump delivers a constant feed, and the spinneret produces uniform filaments, reducing fuzz and broken threads, thereby improving the winding efficiency and first-grade product rate.

They ensure uniform plasticization and high fiber quality. During post-drawing of the as-spun fibers, the orientation and crystallinity are consistent, enhancing key indicators such as fiber strength, elongation, and dyeing uniformity.

These screws exhibit strong adaptability, covering all major types of chemical fibers. Optimized designs are tailored to the rheological properties of different materials. By adjusting the number of pin rows, pin angle, and screw channel depth, they flexibly match processing windows, enabling either multi-purpose use of one machine or dedicated use for specific materials.

Furthermore, they deliver high output with low energy consumption. The pin design improves mixing quality while avoiding intense shear heating, allowing stable operation at relatively high screw speeds. This increases single-machine output and reduces energy consumption per unit output by 10%–15%.

Summary: Chemical fibers are fibrous materials made from natural or synthetic polymers as raw materials, featuring high strength, versatile functionality, and wide applications. In melt spinning of chemical fibers, the screw from suzhou Jwellmech（https://www.jwellmech.com/，+86- 15806221827 is the core component. The chemical fiber screw with LTM pin design enhances mixing, reduces temperature fluctuations, and improves plasticizing uniformity. It offers application advantages such as stable extrusion, high fiber quality, strong adaptability, high output, and low energy consumption.