Non woven fabric is a type of textile made by stacking long fibers, which is characterized by no obvious textile direction and texture, and has good breathability, softness, and toughness. However, non-woven fabric itself does not have waterproof performance and requires special surface treatment or the addition of waterproofing agents to improve its waterproof performance. The waterproof performance of non-woven fabrics can be achieved to varying degrees through various methods.
Waterproof treatment method
Common methods include coating treatment, melt blown coating, and hot press coating.
Coating treatment
Coating treatment is a common method to improve the waterproof performance of non-woven fabrics. Coating treatment can form a waterproof film on the surface of non-woven fabric, giving it a certain waterproof function. This method usually uses coating agents or polymer solutions, and the coating material can choose different polymers or chemical compositions to achieve different waterproof effects. Coating treatment can provide reliable waterproof performance, but it will have a certain impact on the breathability of non-woven fabrics.
Melt blown film coating
Melt blown film coating is another common method to improve the waterproof performance of non-woven fabrics. Melt blown coating is the process of spraying molten polymer particles onto non-woven fabric through a nozzle to form a layer of coating, which is then cooled to form a continuous film. This method usually uses hot melt adhesive or hot melt polymer as a covering, which has good waterproof performance and breathability. Melt blown film coating can provide high waterproof performance and has good bonding with the fibers of non-woven fabric, making it less prone to detachment.
Hot pressed film coating
Hot press laminating is a complex method to improve the waterproof performance of non-woven fabrics. Hot press laminating is a process of bonding non-woven fabric with waterproof membrane materials through hot pressing, ensuring a firm bond. This method usually requires high temperature and pressure to ensure a strong bond between the membrane material and non-woven fabric. The thermal insulation film can provide high waterproof performance and is not easily affected by the external environment, but it may have a certain impact on the breathability of non-woven fabric.
Factors affecting waterproofing effectiveness
The waterproof performance of non-woven fabric can be improved through the above methods, but the specific effect is affected by various factors.
Firstly, the raw materials and fiber structure of non-woven fabrics will have an impact on their waterproof performance. Generally speaking, longer fibers and tighter structures in textiles will have better waterproof performance.
Secondly, coating agents, film covering materials, and process parameters of melt spraying and hot pressing also have an impact on waterproof performance, so it is necessary to optimize and adjust these factors.
In addition, the use and environmental conditions of non-woven fabrics can also affect their waterproof performance requirements, and different uses and environments may require varying degrees of waterproof performance.
Conclusion
Overall, the waterproof performance of non-woven fabrics can be improved through special surface treatment or the addition of waterproofing agents. Coating treatment, melt blown film coating, and hot press film coating are common methods that can achieve varying degrees of waterproof effect. However, the specific waterproof performance still needs to consider the comprehensive influence of multiple factors, including fiber structure. Waterproof materials, process parameters, usage, and environment, etc.
Post time: Aug-19-2024