Production technology and application of polypropylene fiber

The production process and application of polypropylene fiber. Polypropylene production technology. In order to manipulate polypropylene fibers in the spinning industry, melt spinning is required. The temperature of melt spinning is controlled at 220-280℃. The molecular mass is about 120,000. For textile high-strength and denier yarns, the relative molecular mass is usually about 200,000.

In the spinning process, we preheat and soften the granular polypropylene in the feeding part of the screw extruder, melt, compress, mix and defoam in the compression part, and then further melt in the metering part to build up the melt pressure And melt. Then filter and homogenize to the head. The extruded polypropylene melt is metered by a metering pump, and then sent to a spinneret for spinning. The filament ejected from the spinneret passes through the cooling jacket, passes through the oil pan, and is finally wound on the spool. Others are the same as polyester processing, but the stretching temperature is 80 to 130°C, and the stretching ratio is 4 to 8 times.

Polypropylene filament production process:

Screw extrusion filter spinning box ring oil blowing winding traction feeding heat set tension heat set tension traction packaging