The role of hydrostatic pressure resistance in SMS non-woven fabrics

Hydrostatic pressure effect refers to the static liquid pressure on the pressure per unit area. Fabric of hydrostatic pressure is represented with fabric can withstand the hydrostatic pressure of water through the fabric have encountered resistance, is one of the important indicators for water blocking performance fabric, has important significance in medical protective equipment, such as in China promulgated the medical disposable protective clothing technical requirements ( GB19082 - 2003). In protective clothing liquid blocking function make the mandatory rules and requirements when the hydrostatic pressure of 167 kpa, protective clothing must not permeability; Moisture transmission should not be less than 2500 g / ㎡. Surgery and surgical towel requirements for patients and doctors also have security, because when fluid permeability material, microbes were brought into, so the gown to prevent liquid infiltration and accompanied by bacteria. Study the effect of spinning melting non-woven hydrostatic pressure resistance factors to help find ideas to improve the barrier property SMS non-woven products, improve production efficiency, stable and gradually improve the quality of medical protection with non-woven fabric. SMS melt-blown technology process of various process parameters on the product the influence of hydrostatic pressure resistance, mainly includes: raw material, the proportion of melt-blown, screw die head temperature, hot air temperature and air volume, receiving distance and machine status, etc. Gown for water barrier property involved many indicators, such as hydrostatic pressure resistance, spraying experiment, touch water level, etc. , one of the most commonly used is the hydrostatic pressure. Hydrostatic pressure resistance refers to the test material slowly rising water pressure resistance, in all kinds of system test method, the index according to the test area, the water pressure rising rate and appear a few water to determine the end of the position to judge them, the greater the numerical description of material to water barrier property, the better. SMS has a layer of density of melt-blown non-woven middle layer, the fiber linear density is small, basically superfine fiber, can reach 0. 01纤度~ 0。 05 dtex, about 1% of the ordinary spinning viscose fiber linear density. Melt-blown fabric fiber is very thin, fabric is very uniform. When liquid after contact with, because the surface tension of liquid is not easy to permeate, superfine fiber connection between the formation of the gap is fairly small, so the dust and bacteria is blocked, make operation uniform approximation 'absolutely clean' the effect.