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Polypropylene high strength yarn, as a common synthetic fiber raw material, has been widely applied in various fields such as flexible container bags, geotextiles, and conveyor belts in recent years due to its good tensile strength and relatively outstanding acid and alkali resistance. 

During the production process of polypropylene high-strength fibers, the setting of spinning process parameters will directly affect the fineness uniformity and tensile properties of the finished fibers. 

Control of melting temperature

When the polypropylene pellets are melted in the screw extruder, the temperature fluctuations should be kept within a relatively narrow range. Excessive temperature may lead to degradation of the molecular chains, resulting in a decrease in fiber strength; too low a temperature will cause insufficient melt flow, which may lead to fuzziness or broken ends. Generally, for different grades of raw materials, the appropriate temperature range should be determined based on small-scale tests. 

Adjustment of stretching ratio

Heat stretching of the raw fibers is a key step to enhance the strength. If the stretching ratio is too low, the molecular chain orientation is insufficient; if it is too high, uneven stretching or excessive stretching in certain areas may occur, which will affect the qualification rate of the finished products. Using two-stage or three-stage stretching in combination with heat setting helps to improve the internal structural stability of the fibers. 

Cooling and molding conditions

The temperature and speed of the side-blowing air will affect the crystallization rate and the uniformity of the filament cross-section. Cooling too quickly may result in differences in the skin-core structure, while cooling too slowly is prone to the problem of splitting. It is recommended to make minor adjustments to the opening degree of the air window according to seasonal changes and the workshop environment.

Taixing Hongyang New Materials Technology Co., Ltd.  (official website: www.zn63a-12.net) specializes in the production of:  polypropylene high strength yarn, polypropylene filament, polypropylene air change yarn, polyester air change yarn, ribbon.. Please pay attention to Taixing Hongyang New Materials Technology Co., LTD.!

"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!