What factors affect the strength of polypropylene high strength yarn? The strength of the high strength polypropylene fiber is affected by the production of these three points, we need to pay attention to oh!

1. 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 amount of fiber increases under the same process conditions. When the molecular entanglement is large, the strength of the stretched fiber increases with the increase of molecular weight, and when the molecular weight is low, it is easy to produce slip between molecular chains, which is manifested in the decrease of fiber strength. In the process of polypropylene high-strength silk spinning, several raw materials with different melt indices are used.

2. Influence of stretch factor

The stretching 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 is increased, and various structural units gather along the axial orientation of the fiber, rearrange and add new binding points, so that more molecular chains of the fiber are in the best stress bearing state. The regularity of the three-dimensional structure (that is, crystallization) is produced, and the fiber density increases with the increase of the tensile multiple.

3. Influence of elongation speed

In the spinning water line of one-step polypropylene high-strength yarn, the drawing speed is about equal to the spinning speed. The orientation and crystallinity of the fibers are affected not only by the drawing multiple, but also by the drawing speed. Polypropylene fiber in the stretching process, to complete

Two changes, one is to completely destroy the natural degree of crystallinity, and the other is to rearrange and recrystallize macromolecules. Due to the long molecular chain of polypropylene, such as the high tensile speed, the development of tensile deformation can not keep up with the change of tensile stress, the hysteresis phenomenon is serious, and the macromolecules do not have enough time for orientation and crystallization, showing the strength of the fiber.

As mentioned above, the main factors affecting the strength of high strength polypropylene fiber are the melting index of the raw material, the drawing multiple and the drawing speed. Among them, the tensile ratio contributes the most to the strength of polypropylene high strength yarn.

Today's share to this oh, want to know more about polypropylene high strength yarn related knowledge pay attention to our Hongyang chemical fiber, focus on polypropylene high strength yarn, polypropylene air change yarn, polyester air change yarn production.

"Hongyang" brand polypropylene high strength yarn products have small color difference, good color fastness, high strength, and are widely used in decorative belts, safety belts, marking lines, etc.The company's main product:  polypropylene high strength yarn , polypropylene filament, polypropylene air change yarn，polyester air change yarn, ribbon.

Taixing Hongyang New Materials Technology Co., Ltd. has consistently adhered to the "excellent quality, customer first, quality service, adhere to the contract," the purpose, with high-quality products, good reputation, selling the country. Wholeheartedly with the domestic business win-win cooperation and common development!