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 number of stretching times and the same process parameters, the lower the melting index of the polypropylene slice, the higher the strength of the polypropylene high strength yarn.
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.
Jiangyin Jinmeng Textile Co., Ltd. is a professional enterprise engaged in high-strength polypropylene industrial silk, engineering fiber, high-strength polypropylene filament, woven geotextile and polypropylene glow-in-night silk and other products. It is located in Yunting industrial zone of Jiangyin City near Taihu Lake in the south and Yangtze River in the north, and the traffic is very convenient.
Polypropylene high strength yarn has the environmental protection, non-toxic, acid-proof, alkali resistance, heat shrinkage of small, light-weight, low thermal conductivity, the static electricity savings, and the advantages of little hygroscopic, less product has great potential in industrial yarn, can be widely used in industrial sling, seat belts, conveyor belt, woven geotextile, filter cloth, canvas, wire, cable, cable and other industries, etc., It is a novel textile material to replace nylon and polyester.
What are the factors that affe
