What are the factors affecting the strength of polypropylene high strength yarn?

1. The influence of melting index

The melting index of the raw material indicates the molecular weight of the raw material to a certain extent, and the fiber content increases under the same process conditions. If the molecular entanglement degree is high, the strength of the stretched fiber increases with the increase of molecular weight, and the molecular chain slippage is easy to occur when the molecular weight is low, which is manifested in the decrease of fiber strength. Several raw materials with different melting indices are used in the spinning process of  polypropylene high strength yarn.

In THE TRIAL SPINNING process, it is found that under the same technological conditions, the strength of the finished silk varies with the melting index of the raw material, and shows a certain regularity.

Under the same spinning temperature, the same stretching times and the same process parameters, the lower the melting index of polypropylene slices, the higher the strength of  polypropylene high strength yarns.

2. The influence of stretch factor

The stretching process of fiber is destroyed the original structure of fiber morphology, generate a new sequence state structure, under the action of tensile stress and the thermal effect, increase the activity of the macromolecular chain segment, any structural unit gathered the fiber axial orientation, rearrange, adding new combining site, the more molecular chain in a particularly good stress in the fiber under state, The fiber density increases with the increase of the stretch ratio.

The strength of the fiber increases with the increase of the stretch factor, and the contribution of the stretch factor to the fiber strength is greater.

The main products of Changzhou Juntai Chemical Fiber Products Co., Ltd. are:  polypropylene high strength yarn, polypropylene Puqiang filament, polypropylene air-change filament, polyester air-change filament, nylon air-change filament, carpet, lawn, base cloth and yarn, etc. The company has a strong technical team and perfect service team.

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