The reason for the divergence of polypropylene hollow wire!

polypropylene hollow wire divergence may be caused by the following reasons:

Production technology

Improper spinning temperature: too high spinning temperature will make the flow of polypropylene melt too strong, resulting in difficult to maintain a good shape after the wire spray hole, easy to diverge; If the temperature is too low, the viscosity of the melt will be too large, and it will be difficult to extrude, and it may also cause uneven thickness and divergence of the filament.

Unreasonable drafting multiple: too large drafting multiple will cause the polypropylene hollow wire to be over-stretched, and the internal structure of the fiber will be destroyed, resulting in the breakage or divergence of the filament; The drafting multiple is too small, the orientation of the filament is not enough, the fiber strength is low, and it is also easy to diverge during subsequent processing or use.

Poor cooling conditions: the wind speed and wind temperature of the cooling wind are uneven or unstable, which will cause the cooling of the wire strip to be uneven, resulting in inconsistent contraction of all parts of the wire strip, resulting in internal stress and divergence of the wire strip.

Raw material aspect

The quality of raw materials is unstable: the molecular weight distribution of polypropylene slices is not uniform, the water content is too high or contains impurities, which will affect the spinning quality. If the molecular weight distribution is too wide, the rheological property of the melt will be unstable, resulting in uneven filament thickness and easy divergence. Excessive moisture content will produce bubbles in the spinning process, affecting the uniformity and strength of the filament, which will lead to divergence.

Improper use of additives: In the polypropylene spinning process, it is necessary to add an appropriate amount of additives, such as antioxidants, lubricants, etc. If the type, amount or addition of additives is improper, it may affect the performance and surface quality of polypropylene hollow wires, resulting in uneven friction between the wires, resulting in divergence.

Equipment aspect

Spinneret problem: The unreasonable pass design of spinneret, insufficient machining accuracy or uneven hole wall roughness will cause the melt flow rate to be uneven during ejecting, resulting in inconsistent wire thickness and easy divergence. In addition, the use of the spinneret is too long, and the holes are worn or blocked, which will also affect the uniformity and stability of the wire strips, resulting in divergence.

Wear of wire guide parts: After long-term use of wire guide parts such as wire guide and roller, the surface will be worn, resulting in uneven friction during the operation of the wire, so that the wire deviates from the normal trajectory and diverge.

In addition, during the transportation and storage of polypropylene hollow wire, if affected by external extrusion, friction, or environmental humidity and temperature changes, it may also lead to divergence of the filament.

Shanghai Jinci Industrial Co., LTD., founded in March 2006, is a large entity company specializing in the production and sales of polypropylene yarn (PP yarn). The company's products include polypropylene general strong yarn, polypropylene high strength yarn, polypropylene light body yarn, polypropylene twist yarn, polypropylene hollow yarn, polypropylene fluorescent silk, polypropylene luminous silk, polypropylene flame retardant silk, polypropylene air yarn and so on.