Shanghai Chengsi mask synthetic blood penetration tester CSI-286 technical exchange and experience

Mask Synthetic Blood Penetration Tester Mask Synthetic Blood Penetration Tester is suitable for the determination
of synthetic blood splash penetration performance of medical meltblown filter material.

It can be used
by medical inspection departments, safety testing departments and scientific research.

Working principle: The medical mask sample is supported on the test device, and 2 mL of synthetic blood is sprayed horizontally from the inner diameter of the 0.
84 mm casing to the meltblown filter material
to be measured at a distance of 300 mm.

Simulates the scene of the mask being sprayed with blood from perforated blood vessels, and observes the penetration of synthetic blood on the other side of the meltblown filter material
.

The medical mask samples were tested
according to the liquid injection pressure corresponding to the liquid injection speed: 450 cm/s, 550 cm/s, and 635 cm/s, respectively.

The test results of each spray speed are recorded, and the acceptable mass level of the medical mask is limited to 4 corresponding to the gao blood pressure
.

Applicable standard GB19083-2010: technical requirements for medical protective meltblown filter media; YY 0469-2011: Meltblown filter media for medical surgery; YY/T0691-2008: Infectious Agent Protective Equipment Medical Mask Anti-Synthetic Blood Penetration Test Method (Fixed Volume, Horizontal Spray) Test Steps: 1, Pull the handle of the specimen clip in the upper left of the instrument and pull down the specimen holder
to the left.

The sample (the standard requires the sample to be removed from the pretreatment chamber within 60s for testing) fixed to the specimen holder, if the meltblown filter material has folds, the folds are unfolded and fixed on the specimen holder to ensure that the target area is a monolayer material, with the sample center as the test target
.

Close the specimen holder
.

2, press the "Start" key, at this time, a certain amount of synthetic blood (surface tension (0.
042±0.
002 N/m) along the horizontal direction of the positioning target behind the meltblown filter material, while the time timer starts to time, to the set injection time, the instrument automatically stops spraying
.

After 10s, the buzzer sounds, press the "Stop" button, and pay attention to check whether the observation surface of the specimen has synthetic blood.


3, the end
of one trial.

If the trial needs to be continued, repeat Steps A-C until the full test
is done.

After the test is completed, the synthetic blood residue in the test tank is removed, replaced with distilled water, the entire pipeline is cleaned, and when the sprinkler sprays out clean water, the water in the test tank is continued to be drained
.

Close the outlet valve on the air compressor and turn off the power switch
.

Wash the residual liquid tray, clean the work surface, and remove the distilled water from the test tank
.

4, positioning target test First, close the outlet valve on the air compressor, connect the air compressor to the power supply, and wait
for the air compressor to reach the predetermined pressure.

Cut off the air compressor power supply, turn off the air source switch, open the outlet valve to pull the filter pressure reducing valve head on the left side of the instrument upwards, according to the valve head instructions, the "+" direction is pressurized, the "-" direction is the pressure reduction adjustment, so that the pressure gauge of the filter pressure reducing valve shows 0.
2MPa
.

The positioning target is installed so that the distance between the back of the positioning target and the meltblown filter material specimen is 10mm, and the positioning screw on the bottom guide plate of the positioning target is tightened for positioning
.

5, the air source switch on the left side of the instrument is rotated to close (vertically closed), turn on the power switch, press the "test solution" button, pay attention to the return pipe above the test box, the return water pipe has a test liquid flowing out, immediately press the "test liquid" key
.

The upper test solution is complete.


After determining the distance from the nozzle to the mask with a locator is (300±10) mm, the positioning target is fixed
with screws.

Unscrew the air source switch on the left side of the instrument (knob level), adjust the precision pressure reducing valve at the top of the instrument, according to the valve head instructions, the "+" direction is pressurized, the "-" direction is the pressure reduction adjustment, the pressure gauge pressure is adjusted with reference to Table 2, the "spray time" timer on the panel is set to 1min or more, press the "Start" key, loosen the nozzle positioning screw, adjust the nozzle up and down, adjust the nozzle up and down, make the test liquid flow of the injection align with the center of the hole on the positioning target plate in a direct shape, tighten the positioning screw, Press the "Stop" key
.