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What instrument is used to test the filtration efficiency of meltblown cloth?

As the core material of medical masks, meltblown cloth has a direct impact on the protective effect of masks. There are many factors that affect the filtration performance of meltblown cloth, such as fiber linear density, fiber web structure, thickness and density. As the air filter material of a mask, if the material is too tight, the pores are too small, and the breathing resistance is too large, the user cannot inhale air smoothly, and the mask will lose its use value. This requires the filter material not only to improve its filtration efficiency, but also to reduce its respiratory resistance as much as possible, and the respiratory resistance and filtration efficiency are a pair of contradictions.


The editor of Horizon will introduce the common sense of meltblown cloth filtration efficiency performance testing instrument.


Meltblown cloth filtration mechanism

 

Among the filtering mechanisms of meltblown filter materials, the generally recognized mechanisms are mainly Brownian diffusion, interception, inertial collision, gravity sedimentation and electrostatic adsorption. Since the first four principles are mechanical barrier, the filtering mechanism of meltblown cloth can be simply summarized as mechanical barrier and electrostatic adsorption.


What instrument is used to test the filtration efficiency of meltblown cloth?

 

The PFT-01 meltblown cloth particle filtration efficiency (PFE) tester produced by Horizon uses polydisperse experimental aerosol to quantitatively generate dust. Under the action of clean air flow (negative pressure), the aerosol particles are sampled and compressed by the upstream and downstream of the tested filter material. Routine performance tests are carried out at the test points, mainly to test the anti-particle filtering performance of meltblown fabrics and meltblown non-woven fabrics.


Technical Specifications


Item

PFT-01

Meltblown cloth particle filtration efficiency (PFE) tester

Test Range

0-99.999%

Accuracy

±1%

Flowmeter Range

(10-100)L/min

Sampling Frequency

1-9999/min

Particle Concentration

20-30 mg/m3 

Counting Median Diameter

Salt particles(0.075±0.02)μm

Oil particles(0.185±0.02)μm

Geometric Standard Deviation of Particle Size Distribution

Salt particles≤1.86

Oil particles≤1.60

Dynamic Detection Range

0.001-100 mg/m3,accuracy1%

Power Supply

AC 220V 50Hz

Net Weight

64 kg



Instrument configuration: host, computer, professional software, aerosol generator, laser dust particle counter, glass rotameter, vacuum pump


Simple operation steps of meltblown cloth particle filtration efficiency (PFE) tester:

1. Power on and warm up the instrument for at least 30 minutes.

2. Sample preparation. Prepare the sample as required, and the sample has no obvious defects.

3. Preparation before the test. Perform sample pretreatment as required.

4. Conduct experiments. First select the "test mode" to start the test; then perform other tests to get the corresponding test indicators.

5. Perform the next set of experiments. If you need to continue testing, repeat the above test steps.

6. After the test, click the "Back" button to return to the "Main Interface". Turn off the power and air source of the equipment, and cover with dust cloth. The dust-proof cloth should be kept clean and tidy without dust.


Are you looking for testing instruments for face mask, meltblown cloth and medical protective clothing, please check details from: https://www.horizontester.com/face-mask-testing-instruments-c.html