Study On The Effect Of Anti-hydrostatic Pressure And Breathability Of Legcuff SMMS Non Woven Fabric

Because legcuff smms non woven fabric is used as anti-seepage side leakage edge of sanitary napkins, sanitary pads, baby diapers, etc. in the sanitary field, and used as advanced surgical gowns and protective clothing in the medical field, it needs to have strong anti-static properties. Water pressure capability and good breathability, but for the production of legcuff smms non woven fabric, hydrostatic pressure resistance and breathability are contradictory sides. Increasing the hydrostatic pressure resistance tends to reduce the breathability performance. Therefore, it is necessary to ensure that the product It is more difficult to have high anti-hydrostatic pressure and good air permeability at the same time. In view of this contradiction, this paper studies the changes in the hydrostatic pressure resistance and air permeability of legcuff smms non woven fabric when the production process changes, and obtains the influencing factors of hydrostatic pressure resistance and air permeability and the best process settings. It has certain guiding significance for manufacturers to produce products that meet customer requirements.

1. The effect of extrusion volume on the performance of legcuff SMMS non woven fabric

In the production of legcuff smms non woven fabric products, the amount of melt extrusion is an important factor in determining the gram weight of the product, as well as an important factor affecting the hydrostatic pressure resistance and air permeability of SMMS products. The amount of melt extrusion is determined by the speed of the metering pump. Under the same conditions, the faster the metering pump rotates, the greater the amount of melt extrusion. When the speed of the mesh belt is the same, the larger the melt extrusion amount, the larger the product gram weight, and the anti-hydrostatic pressure and air permeability of the SMMS product will change accordingly. Due to the limited experimental conditions, this experiment only changed the speed of the metering pump of the C head (the four nozzles of the SMMS correspond to ABCD). Through the experiment, it can be obtained that when the air volume is constant, the speed of the metering pump should not be too fast, and the quality should be guaranteed while the product output is guaranteed. Manufacturers can set the C-head metering pump speed at 32~35rpm to meet the requirements of anti-hydrostatic pressure (>35mbr) and air permeability (>45cfm), and their products can be used as general protective clothing.

2. The effect of feeding net curtain speed on the performance of legcuff SMMS non woven fabric

Through experiments, it can be obtained: to produce legcuff smms non woven fabric products with the same gram weight and meet the same requirements for hydrostatic pressure resistance and air permeability, which can be achieved by changing the extrusion volume of the metering pump and controlling the speed of the mesh conveyor. In the actual production process, it is generally necessary to increase the speed of the mesh conveyor as much as possible, and adjust the extrusion volume of the metering pump to ensure the needs of high-speed production.

3. The effect of hot air volume on the performance of legcuff SMMS non woven fabric

When the spinneret holes are fixed, the hot air volume increases and the airflow speed increases, so that the fibers are drawn more fully, which has an important influence on the hydrostatic pressure resistance and air permeability of the base fabric of legcuff smms non woven fabric. Through experiments, it can be obtained that the anti-hydrostatic pressure capability of the base fabric increases with the increase of the hot air volume. When the air volume reaches 2800 cubic meters/h, the anti-hydrostatic pressure capability is the strongest. The water pressure capacity decreases instead. When the air volume is 2800 cubic meters/h, the air permeability is the smallest. The rising and falling trend of the air permeability curve is just opposite to that of the anti-hydrostatic pressure curve. Therefore, for the manufacturer, the hot air volume can be controlled at 2800 cubic meters/h to meet the requirements of hydrostatic pressure resistance (>5mbr) and air permeability (>45elm) at the same time.

Through experiments, this paper draws the following conclusions:

A. The gram weight is an important factor affecting the anti-hydrostatic pressure and air permeability of the product, and the speed of the metering pump and the speed of the conveying curtain together determine the size of the gram weight. It is appropriate to set the speed of the C-head metering pump between 32 and 35 rpm while maintaining the speed of the net curtain at 175m/min.

The greater the gram weight of the B.legcuff smms non woven fabric product, the greater the moisture resistance and the greater the anti-hydrostatic pressure; the greater the air permeability resistance, the worse the air permeability.

C. The increase of the amount of hot air can make the fiber fineness thinner, but if it is too large, it will produce flying silk. The ideal value should be controlled at 2750-2850 cubic meters/h. At this time, the legcuff smms non woven fabric product has good anti-hydrostatic pressure. And breathability, can be used as general protective clothing.