Which fields are High Tenacity polypropylene high-strength Fiber/yarns suitable for?

Which fields are High Tenacity polypropylene high-strength Fiber/yarns suitable for?

Ropes made of high-strength polypropylene fibers and nets for construction, transportation, agriculture, fishery, and sports activities have high breaking strength, wear resistance, corrosion resistance, light weight and safety.

Polypropylene yarn made of high-strength polypropylene yarn is mainly used in woven bag sewing, football, volleyball, baseball, yo-yo because of its low price, high strength, anti-aging, wear resistance, seawater corrosion resistance, and good elasticity. Thread, cable thread, netting thread, shoe material thread, luggage thread, kite thread, twisted edge thread, waste edge thread, special thread for container bags, sewing thread, banknote binding thread, curtain thread, construction thread, engineering thread, webbing Line, toy line, umbrella rope line, optical cable winding line, fishing net line and other industries.

What are the factors that affect the strength of polypropylene high-strength yarn?

1. The influence of melt index

The melt index of the raw material represents the molecular weight of the raw material to a certain extent. Under the same process conditions, the amount of fiber increases. When the molecular entanglement degree is large, the strength of the drawn fiber increases with the increase of the molecular weight. When the molecular weight is low, the slippage between the molecular chains is easy to occur, which is manifested in the decrease of the fiber strength. In the spinning process of polypropylene high-strength yarn, several different melt index raw materials are used.

During the trial spinning process, it was found that under the same process conditions, the melt index of the raw material was different, and the strength of the finished yarn was different and showed a certain regularity.

Under the same spinning temperature, the same stretching ratio and the same process parameters, the lower the melt index of polypropylene chips, the higher the strength of polypropylene high-strength yarn.

2. The influence of stretch ratio

The stretching process of the primary fiber is to destroy the original structure of the primary fiber and generate a new ordered structure. Under the action of tensile stress and thermal effect, the mobility of the macromolecular segment increases, and various structural units slide on the fiber. Axial orientation aggregates, rearranges and adds new bonding points, so that more molecular chains of the fiber are in a particularly good stress-bearing state, and the regularity of the three-dimensional structure (that is, crystallization) is generated, and the fiber density increases with the increase of the stretching ratio. .

With the increase of the stretching ratio, the strength of the fiber increases, and the stretching ratio contributes more to the strength of the fiber.