The change of filtration efficiency and airflow resistance of polypropylene meltblown cloth for masks under different conditions was studied, and the reference for the production and application of meltblown cloth and the use of masks were provided. By selecting three conditions of different test flow rate, number of stacking layers and loading time, experiments were carried out on the filtration efficiency and airflow resistance of salt particles of meltblown cloth for masks. The salinity filtration efficiency showed a linear decreasing trend, and the airflow resistance showed a linear increasing trend; with the increase of the number of sample stacking layers, the filtration efficiency first increased and then tended to be stable, and the airflow resistance value showed a linear increasing trend; as the loading time increased The results of filtration efficiency and airflow resistance increased with the extension, but the increasing trend of filtration efficiency changed from abrupt to slow, and the airflow resistance changed from slow to rapid. Therefore, in the production of melt-blown cloth, the flow rate of gas can be reduced by increasing the filter area, and the multi-layer melt-blown cloth can also be appropriately selected in the production of masks, both of which can improve the filtering efficiency of the product. In addition, masks should not be used for a long time, otherwise it will cause poor breathing.

The Respiratory Resistance Tester is used to measure the resistance of ordinary fabrics and medical protective masks to constant flow of airflow.

Criteria for airflow resistance

ASTM C522-2003(2016) Standard Test Method for Airflow Resistance of Acoustic Materials

ASTM C522-2003(2009)e1 Test Method for Airflow Resistors of Sound Absorbing Materials

ASTM C522-2003 Standard Test Method for Airflow Resistance of Sound Insulating Materials

ASTM F778-1988(2014) Standard Method for Airflow Resistance of Filter Media

ASTM C522-1987(1997) Standard Test Method for Airflow Resistance of Soundproofing Materials

The main technical parameters

1. Air source: suction type

2. Air flow: (85±2) L/min

3. Sample plate: Ф190mm disc

4. Sealing method: O-ring seal

5. The breathable diameter of the sample: Ф74mm

6. Differential pressure sensor range: 0～1kPa

7. Display mode: four-digit display

8. Sample size: protective mask or 120mm*120mm fabric

9. Power supply: 220V, 50Hz

The above is the detailed information about Respiratory Resistance Tester, friends who have purchased, please leave us a message!