Polypropylene non-woven fabric is a kind of non-woven fabric made from polypropylene as raw material through melting, spinning, laying, bonding, curling and other processes. Because the production process of non-woven fabrics is simple, the output is large, and it is non-toxic and harmless to the human body. Therefore, it is widely used in sanitary materials, medical supplies, bedding, sofas, bags, shoes, clothing and other fields.
Basic polypropylene non-woven fabric has the characteristics of low density, soft texture, loose and plump, non-toxic and breathable. After being modified to be hydrophilic and water-repellent, it can be used to make the surface and bottom layers of disposable sanitary products respectively, giving the product hydrophilic, water-repellent and breathable functions. It can be used in disposable products for infants and young children such as diapers. .
Polypropylene non-woven fabric is prepared by spinning, stretching, netting, hot rolling and other processes. There are many meshes and pores between polypropylene filaments and it has good air permeability. As the weight of non-woven fabrics increases, the mesh structure becomes denser, the porosity becomes smaller, and the air permeability becomes stronger.
When the weight of the polypropylene non-woven fabric is in the range of 25gsm~45gsm, the MVRT reaches 2100g/(㎡.24h); the MVRT of the disposable sweat-absorbent towel prepared with polypropylene non-woven fabric reaches 2080g/(㎡.24h), and the breathability Its comfort and comfort are better than polyethylene breathable membrane, and it has good cost performance.
During the preparation process of hot-rolled polypropylene non-woven fabrics, the extrusion and traction speeds generally remain unchanged, and the fiber diameter remains basically unchanged. The increase in gram weight is achieved by reducing the speed of the web-laying traction belt. The number of fibers accumulated per unit area increases and the pores between the fibers become smaller. The greater the weight and thickness of the non-woven fabric, the smaller the porosity, and the poorer air permeability. As the weight of non-woven fabrics increases, the mesh structure becomes denser and the pores between fibers gradually decrease.
When the spinning and traction conditions remain unchanged, the diameter of the fiber remains basically unchanged, the laying and traction speed slows down, and the number of fibers accumulated per unit area increases. The denser the polypropylene yarn is accumulated, the thickness of the non-woven fabric increases, so The greater the weight, the smaller the pores.
