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Polypropylene high strength wire is a kind of high performance fiber, which has the advantages of high strength, wear resistance, corrosion resistance, etc., and is widely used in industry, construction, automobile and other fields. The following is the general process and analysis of the production process of polypropylene high-strength yarn:
Raw material preparation
The main raw material of polypropylene high strength wire is polypropylene (PP) slice. It is required to select polypropylene slices with high relative molecular weight and high isotropy to ensure the strength and performance of the fiber. At the same time, in order to improve some properties of the fiber, such as anti-ultraviolet, anti-static, etc., an appropriate amount of additives will be added, such as antioxidants, light stabilizers, antistatic agents, etc.
Melt extrusion
Polypropylene slices are added to the extruder and heated to melt. The temperature of the extruder is usually controlled between 250 ° C and 280 ° C to ensure that the polypropylene slices can be fully melted, while avoiding excessive temperatures leading to polymer degradation.
The molten polypropylene is pushed forward by the rotation of a screw and extruded through a spinneret at the head of the extruder to form a filament. The shape and size of the spinneret hole on the spinneret have a direct effect on the cross-section shape and diameter of the fiber, and the appropriate spinneret is selected according to the requirements of the product.
Cooling forming
The strips extruded from the spinneret are cooled and solidified in the air, a process called air cooling. The temperature, humidity and wind speed of the air have important effects on the cooling effect of the filament and the structural properties of the fiber.
In order to obtain better cooling effect and fiber performance, special cooling methods can also be used, such as ring blowing cooling, side blowing cooling and so on. These cooling methods allow for more precise control of the cooling conditions, so that the strips are cooled evenly, thereby improving the strength and uniformity of the fibers.
stretch
The cooled strips need to be stretched to improve the orientation and crystallinity of the fibers, thereby increasing the strength of the fibers. Stretching is usually carried out on a stretching machine, using a multi-stage stretching method, and the total stretching multiple is generally between 5-10 times.
The tensile temperature also has an important effect on the properties of the fibers. Generally speaking, the tensile temperature is above the glass transition temperature of polypropylene (about 10℃-20℃) and below the melting point. In this temperature range, the polymer molecular chain has a good activity, easy to orientation and crystallization under the action of external forces.
Heat setting
There is a certain internal stress in the fiber after stretching. In order to eliminate the internal stress and improve the dimensional stability and crystallinity of the fiber, it is necessary to carry out thermal setting treatment. Heat setting is usually carried out in the heat setting machine, the temperature is controlled between 150 ° C and 180 ° C, and the processing time is determined according to the variety and requirements of the fiber, generally between a few minutes and dozens of minutes.
There are many ways of heat setting, such as dry heat setting, wet heat setting and so on. Dry heat shaping is done by heating the fibers with hot air, and wet heat shaping is done in water vapor or hot water. Wet heat shaping can more effectively eliminate the internal stress of the fiber and improve the softness and elasticity of the fiber, but it is necessary to pay attention to control the humidity and treatment time so as not to affect the performance of the fiber.
wind
The heat-shaped fibers are wound into bobbins by a winding machine for subsequent processing and use. The winding speed, tension and other parameters have important effects on the winding quality and appearance of the fiber, and need to be adjusted reasonably according to the variety and specifications of the fiber.
In the production process of high strength polypropylene fiber, the control of process parameters is very important. The parameter fluctuation of any link may lead to the change of fiber properties. In addition, the accuracy and stability of production equipment also have an important impact on product quality. Therefore, it is necessary to use advanced production equipment and automated control systems to ensure the stability of the production process and the consistency of product quality.
Xuzhou Peace Chemical Fiber Co., Ltd. is located in Xuzhou, Jiangsu. It has focused on the research and development and production of polypropylene, high strength, high strength, high strength, high strength, anti-aging, acid and alkali resistant, etc., which also make polypropylene high strength. Wire can be applied to all aspects of our lives. Peaceful chemical polypropylene, manufacturers supply, complete products, high quality after-sales service, users can rest assured to buy. Peace chemical fiber also has a polypropylene industrial silk, polypropylene high strength wire, high-strength polypropylene wire, polypropylene high strength yarn, high-strength propylene, and hydrazine industrial wire.
You still want to know more product information, please contact: Mr. Wang 187 5178 8889 Website: http://taojoe.com/