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PP Spunbond machine manufacturers take you to understand the process principle of spunbond production
Release time:
2023-03-07
The PP Spunbond machine manufacturer tells you that the main products of spunbond nonwovens are polypropylene and polyester (long fiber, short fiber) nonwovens. The most common and commonly used applications are nonwoven bags and nonwoven packaging.
The PP Spunbond machine manufacturer tells you that the main products of spunbond nonwovens are polypropylene and polyester (long fiber, short fiber) nonwovens. The most common and commonly used applications are nonwoven bags and nonwoven packaging. Spunbonded nonwovens have high strength, good high temperature resistance (polypropylene can be used for a long time in an environment of 150 °C, and polyester can be used in an environment of 260 °C for a long time), aging resistance, UV resistance, high elongation, stability and air permeability Good, corrosion resistance, sound insulation, mothproof, non-toxic features.
1. The process principle of spunbond production
The PP Spunbond machine manufacturer tells you that the principle of the spunbond method is to use the method of chemical fiber spinning to spin, draw, and lay high polymers into a web, and finally through acupuncture, spunlace, hot rolling or self-bonding. Consolidation forms the nonwoven material.
2. Spunbond process
Polymer slicing-slicing drying-melt extrusion, spinning-cooling-drawing-separating-filament-laying-reinforcement-cutting-winding.
3. Drying of raw materials: The characteristics of spunbond products remove moisture. Chips containing water, such as PET, will be hydrolyzed when they are melted, which will reduce the molecular weight and affect the quality of filaments. Water vaporizes at high temperature, which can easily cause spinning ends or wool. The PP Spunbond machine manufacturer tells you to increase the crystallinity and softening point. The water-containing PET chip has an amorphous structure and a low softening point. It is easy to cause sticking and blocking in the feeding section of the screw, which affects normal production.
4. Stretch
Mechanical drafting, stretching is carried out by the speed difference of the stretching rollers. Commonly used in synthetic fiber production. It is easy to control the fiber, and the degree of stretching is also easy to ensure, but it is necessary to prevent the filaments from sticking.
Air-flow drafting, using high-speed airflow to rub the filaments for drafting. There are many influencing factors, and the control of the stretching effect is complex and difficult. This method is mostly used in spunbond production.
5. Filament
Airflow separation method: PP Spunbond machine manufacturer tells you that using aerodynamic effect, the airflow diffuses in a certain shape of the pipe to form turbulent flow to achieve the purpose of separation. Electrostatic filament separation method: when drawing, the tow passes through a high-voltage electrostatic field or frictional electrification, and the filaments repel each other because of the same charge, so as to achieve the purpose of filament separation.
Textile auxiliaries by mechanical splitting method: After the tow is drawn, it collides with the baffle, spinning roller, vibrating plate, etc., and becomes an irregular motion, achieving the goal of splitting
6. Reinforcement
Acupuncture reinforcement: used for thick products, mainly used for geotextiles.
Self-adhesion: For example, PA66 fiber web is treated with hydrochloric acid aqueous solution to produce self-adhesion, which has been seldom used.
Composite reinforcement: A variety of reinforcement methods are used successively for the fiber mesh.
Hot rolling bonding: used for thin products such as polypropylene.
The above is the PP Spunbond machine manufacturer to take you to understand the relevant content of the process principle of spunbond production, I hope it will be helpful to you.
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