Three major processing technologies of non-woven fabrics —— composite method

Three major processing technologies of non-woven fabrics_——composite method

In order to overcome the shortcomings of low strength and poor dimensional stability of meltblown nonwovens, Kimberlley Company of the United States first developed a composite nonwoven production process consisting of two or more meltblown machines and spunbond machines, spunbond/melt blown composite method (SM or SMS).
The principle of the SMS composite method is to add a meltblown nonwoven fabric machine between two spunbonded nonwoven fabric machines to form a composite production line for the production of nonwovens with spunbonded and melt-blown meshed interlayered fabrics. This process combines the advantages of high strength and good dimensional stability of filament fiber webs, and the advantages of high bulkiness and good air permeability of ultra-fine short fiber webs, thereby compounding nonwoven fabrics with excellent comprehensive properties, and has been widely used Used in surgical gowns, filter materials, etc.

In the production process of the SMS composite method, on the same production line, there are two spunbond spinnerets and one meltblown die head at the same time, and the filaments are sprayed out from the first spunbond spinneret to form the first layer of fiber web. It is a continuous long fiber web, which mainly provides strength and rigidity for the composite nonwoven fabric. Therefore, by controlling the amount of the spunbond web, the strength, softness and feel of the composite nonwoven fabric can be adjusted; The second layer of fiber web is formed, which is a melt-blown ultrafine short fiber web. Controlling the amount of ejection can control the air permeability and filtration performance of the composite nonwoven fabric. The three-layer fiber web is bonded or self-bonded by a hot rolling mill to form a SMS nonwoven fabric. Due to the low production efficiency of meltblown, the spunbond line speed must be sacrificed to ensure product quality and performance, and the productivity can be increased by increasing the number of meltblown die heads.