In the modern chemical fiber industry, polypropylene is increasingly widely used due to its light weight, strength, toughness and chemical resistance. However, the birth of high-performance polypropylene fibers cannot be separated from its core "mother machine" - the Polypropylene yarn stretching machine. The precision and craftsmanship of this equipment directly determine the quality and market competitiveness of the final polypropylene filament.

Polypropylene yarn stretching machine: A precise Journey from pellets to filaments

The essence of a Polypropylene yarn stretching machine is to transform polypropylene chips into continuous and uniformly sized polypropylene filaments through a series of precise processes such as melting, extrusion, metering, cooling and winding. The entire process is like a highly automated industrial assembly line, with each link being of vital importance.

Screw extrusion system: This is the "heart" of the equipment. It uniformly melts solid polypropylene particles into a spinning melt through high temperature and strong shear force. The stable control of temperature and the residence time of materials in the screw are the keys to ensuring that polymers do not degrade.

Metering pump and spinning assembly: The melt is conveyed to the spinning assembly at a constant and precise flow rate through a precision metering pump. The filter screen and spinneret inside the spinning assembly are the core components. The micron-sized holes on the spinneret directly determine the number of monofilaments and the shape of the primary fibers.

Side-blowing air cooling system: The fine stream sprayed from the spinneret is rapidly solidified here by the constant temperature and humidity cooling air, forming a stable fiber structure. The uniformity of cooling is the key factor that affects the orientation and crystallinity of fibers, thereby determining their strength and elongation indicators.

Drawing and winding: For the production of fully drawn wire (FDY), subsequent hot roller drawing and high-speed winding are indispensable. Through the different speeds of multiple hot rollers, the fibers are thermally stretched, significantly enhancing their molecular orientation and mechanical strength. Eventually, they are gathered into filament cakes by the winding head.