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The production of polypropylene high strength yarn mainly adopts the melt spinning method, and its core process includes raw material treatment, melt spinning, stretching and shaping, etc. At present, the mainstream "one-step spinning" and "two-step spinning" processes each have their own characteristics: "One-step spinning" has the advantages of occupying less space, requiring fewer workers and having lower costs, but the strength of the polypropylene filament produced is relatively low. Two-step spinning can produce products with higher strength and is suitable for application fields with high strength requirements.

During the raw material preparation stage, polypropylene chips with a melt index of 10 to 20 are usually used, and the molecular weight is controlled between 180,000 and 200,000. During the production process, cooling masterbatches (with an addition ratio of 2.5% to 3%) need to be added to improve the rheological properties of the melt, which is crucial for ensuring the quality of the fibers.

Control of key technical parameters

Spinning temperature is a key factor affecting product quality. Excessively high temperatures can cause a significant reduction in melt viscosity, easily leading to the formation of injection head threads and fuzz. If the temperature is too low, the melt viscosity will be too high, making it difficult and uneven to produce filaments. Studies show that the optimal spinning temperature should be controlled within the range of 260 to 270 degrees Celsius.

The stretching process is the core link in the production of polypropylene high-strength filament. To obtain polypropylene industrial filament with a breaking strength of 8g/d, the tensile ratio should be selected between 6 and 8 times. For the FDY production process, the distribution of the first and second stretch multiples is mainly for the first stretch, with the second stretch as a supplement. The proportion of the first stretch multiples in the total stretch multiples is preferably 60% to 70%.

The heat setting temperature directly affects the boiling water shrinkage rate of fibers. For polypropylene industrial filaments, the heat setting temperature must be above 120℃, and generally 120-140℃ is appropriate. Tension control during the winding process is also extremely important. Good winding forming requires the tension of the wire bundle to be controlled within 50-60 CN.

Quality control and standards

The quality inspection of polypropylene high-strength filament includes multiple indicators such as strength, elongation, and dyeing uniformity. The physical properties of products can be accurately evaluated by using professional equipment such as the YG086 yarn length measuring machine and the XL-1A yarn strength and elongation tester.

With the continuous improvement of industry standards, the production of polypropylene high-strength filament is becoming increasingly standardized. Manufacturing enterprises ensure that their products meet the quality requirements of different application fields by strictly controlling the selection of raw materials, process parameter control and finished product inspection and other links.

Technological innovation and development trends

In recent years, the production process of polypropylene high strength yarnt has been continuously innovated. By adding materials such as chitin and titanium dioxide, the antioxidant capacity of polypropylene filament can be significantly enhanced, making its surface less prone to oxidation and aging under high-temperature conditions, thereby extending its service life. The addition of nano-scale silica not only enhances the interaction between the additive and polypropylene, but also makes the finished polypropylene spinning product softer.

As the spinning speed increases, the production process is correspondingly optimized. When the spinning speed exceeds 1500m/min, it is necessary to precisely control the temperature of the side blowing air to ensure the quality of the fibers. Research shows that when the spinning speed is 2200m/min, the product quality and production efficiency can achieve the best balance.

The future technological development of polypropylene high-strength filament will focus on further performance optimization and the expansion of application fields. By improving polymer formulations and spinning processes, producers are developing new products with additional functions such as flame retardancy and antibacterial properties to meet the constantly changing market demands.

In conclusion, the production process of polypropylene high-strength filament has developed over the years and has formed a complete technical system. With the continuous application of new technologies and materials, this field will continue to develop in a more efficient, environmentally friendly and professional direction.

Taixing Hongyang New Materials Technology Co., Ltd.  (official website: www.lijiansi.com) 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!