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Process flow of polypropylene non-woven fabric
Due to the special process of making and processing non-woven fabrics from polypropylene, special production processes must be adopted to ensure the processing quality of polypropylene non-woven fabrics, from the inspection of fabrics into the factory, polymer feeding, melting Extrusion, fiber formation, fiber cooling, web formation, reinforcement into cloth and the final quality inspection, can only ensure the processing quality of the final product if it is carried out strictly in accordance with the production process.
The process flow of polypropylene non-woven fabrics: polymer feeding---melt extrusion---fiber formation---fiber cooling---web formation---reinforcement into cloth.
Detailed introduction of polypropylene production process of non-woven fabrics:
Mix the polypropylene and additives in a mixer evenly, and add the obtained mixture to the feeder in the extruder (such as a twin-screw extruder), and the material enters the twin-screw through the feeder, The screw is melted and mixed uniformly, extruded and granulated, and dried to obtain non-woven raw material pellets; then the non-woven raw material pellets are added to a single-screw extruder for melt mixing, extrusion, airflow stretching, and cooling. Cured, netted and reinforced.
Wherein, the auxiliary agent is usually one or more of antioxidants, anti-halogen agents, light stabilizers, heat stabilizers, colorants and fillers.
At present, polypropylene for producing polypropylene non-woven fabrics is usually obtained by using peroxide to degrade polypropylene raw materials with a wide molecular weight distribution (the obtained polypropylene is usually called controlled rheology polypropylene). However, Polypropylene nonwovens made from polypropylene obtained by this degradation method have low strength.
In addition, the use of peroxide will increase the cost of the product on the one hand, and on the other hand, the residual peroxide may further degrade the polypropylene non-woven fabric, thereby reducing the quality of the polypropylene non-woven fabric and making the final The obtained polypropylene non-woven fabric produces an unpleasant taste which limits its application in certain fields (such as medical and health care, food and other fields).
Due to its breathable, flexible, light weight and non-irritating characteristics, polypropylene is often used as an important raw material for processing non-woven fabrics. Due to different processes and details in the production process, non-woven fabrics will be affected. Therefore, in order to improve the quality requirements of non-woven products, from the incoming inspection of the fabric to the final quality inspection, it is necessary to ensure the strictness of the production process of polypropylene non-woven fabrics!
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