User Guide for High-Strength Polypropylene Yarn Stretching Machine!

The high-strength Polypropylene Yarn Stretching Machine is the core equipment for producing high-strength polypropylene fibers. Its working principle is to make the macromolecular chains orderly arrange along the fiber axis through precise stretching orientation, thereby greatly enhancing the strength, modulus and toughness of the fibers. The correct use of this equipment is the key to ensuring product quality and production efficiency.

I. Precise preparations before production

"A workman who wants to do his job well must first sharpen his tools." The preparatory work before starting the high-strength Polypropylene Yarn Stretching Machine is of vital importance. First of all, it is necessary to ensure that the polypropylene chip raw materials are dried up to standard. Extremely low moisture content is a prerequisite for avoiding the formation of bubbles and broken threads during the spinning process. Secondly, conduct a systematic inspection of the entire set of equipment: confirm the operating status of the screw extruder, spinning box, metering pump, side blowing air system, drawing roller group and winding machine. Focus on cleaning the spinning assembly to ensure that the micro-holes on the spinneret are unobstructed. Finally, based on the specifications of the target product (such as fineness and strength), precisely set the process parameters for each zone, including temperature, pressure, screw speed, drawing speed and hot roller temperature, in the control system.

Ii. Precise Control During operation

The process of starting up and running is a dynamic balancing one. First, start the screw extruder to stably transport the molten polypropylene feed liquid to the spinning assembly, where primary fibers are formed through the spinneret. At this point, the uniform cooling of the side-blowing air system determines the quality of the initial structure of the fibers.

Subsequently, the fibers enter the core stretching stage. Multi-stage heat stretching is usually adopted: the fibers first pass through the preheating roller and then are greatly stretched between the faster heat stretching rollers. During this process, thermal energy provides kinetic energy for the movement of molecular chains, while tensile stress guides their directional alignment. Operators must closely monitor the speed ratio, temperature and fiber tension of each drawing roller. Any slight fluctuation will directly affect the final strength and elongation of the product. High-speed and stable winding is the final step, which ensures that the filament barrel is well formed, facilitating subsequent transportation and processing.

Iii. Standardized Operation and Continuous Maintenance

Standardized operation is the guarantee of safety and quality. Operators must wear protective gear properly to strictly prevent risks brought by high-temperature components and moving rollers. Daily maintenance is equally indispensable. It is necessary to regularly clean the accumulated dust on the equipment, replace worn parts, lubricate the transmission system, and calibrate sensors and instruments to keep the equipment in an optimal precision state for a long time.