What are the factors that affect the strength of polypropylene high strength wire?

1. The influence of melting index

The melting index of raw material indicates the molecular weight of raw material to some extent. Under the same process conditions, the amount of fiber increases. When the molecular entanglement is large, the strength of the tensile fiber increases with the increase of molecular weight. When the molecular weight is low, the slip between the molecular chains is easy to occur, which is manifested in the fiber strength reduction. In the process of polypropylene high strength silk spinning, several kinds of raw materials with different melt index are used.

In the process of test spinning, it was found that the strength of finished silk was different with different melt index of raw material under the same process conditions, and showed a certain regularity.

Under the conditions of the same spinning temperature, the same drawing multiple and the same technological parameters, the lower the melt index of polypropylene slice, the higher the strength of polypropylene high strength wire.

2. Influence of stretching factor

The tensile process of the primary fiber is to destroy the original structural form of the primary fiber and generate a new order structure. Under the action of tensile stress and thermal effect, the activity of macromolecular chain segments increases, and various structural units gather along the axial orientation of the fiber, rearrange and add new bonding points, so that more molecular chains of the fiber are in a particularly good stress bearing state. The fiber density increases with the increase of the stretching factor.

With the increase of the tensile ratio, the strength of polypropylene high strength wire increases, and the tensile ratio of the fiber strength is greater contribution.

Suining County Tongjia Chemical Fiber Factory was built in 2013, the main products 300D-3000D all kinds of high-strength polypropylene filament, polypropylene double twist, polypropylene industrial silk, high-strength polypropylene wire, etc. The products have high strength, light weight, uniform heat reduction, flame retardant, anti-aging, low thermal conductivity, are widely used in all kinds of industrial cloth, cable, container bags, crack resistant engineering fiber and other products.