Dr. Dirk Renschen
Phone: +49 201 172-1304
Fax: +49 201 172-1606
The vacuum cleaner bag certification programme “Dust Protection”
This test is used to check and assess the quality of vacuum cleaner bags. The results for the product being certified are presented alongside those of two comparable products from leading manufacturers to enable a direct comparison of quality.
The test criteria assess both the performance of the product and the particular characteristics of the bag designed to minimise fine dust emissions.
1.1 Determining the particle retention capacity in the test chamber in accordance with DIN EN 1822-3
A total of 5 tests with an average air flow velocity of 20 cm/s are carried out on the filter medium (Rondentest) as defined in DIN EN 1822-3. The particle separation efficiency is measured for particles with a diameter of 0.1 to 0.3 µm, divided into 7 particle size ranges. The particle retention capacity is evaluated based on particles with a 0.3µm diameter.
This size range especially is of great importance as such particles can penetrate the alveoli of the lungs and secondly are extremely difficult for filters to separate.
1.2 Determining the dust holding capacity with a steady suction rate and constant air flow velocity
The tests we perform to determine the dust holding capacity of vacuum cleaner bags are carried out using an average air flow velocity of 20cm/s through the bag wall and are irrespective of the vacuum cleaner model.
Using DMT Typ 8 ® test dust, a synthetic house dust conforming to Norm IEC 60312, which is applied in stages of 50g, the corresponding changes in pressure are recorded for up to maximum 500g of test dust. For a static evaluation the test is performed three times under controlled conditions.
The result is a reproducible parameter for the dust holding capacity of vacuum cleaner bags, a defining indicator of the service life span.
1.3 Determining the strength of weld seams (tensile test) and the resistance of the mounting plate (separation test) based on DIN EN ISO 13934 1
The results for these two criteria in the assessment are based on the average values from 10 individual tests measuring the maximum tensile force the seams can withstand without tearing and the force required to break off the mounting plate.
Modern vacuum cleaners are extremely sensitive to damage from household dust, meaning dust escaping from a torn vacuum cleaner bag while in operation can destroy the fan. A robust mounting plate doesn’t only protect the vacuum cleaner, but also enables safe handling when removing or replacing the bag.
1.4 Defining the tightness of the sealing ring against a round suction pipe and the closed bag seal when pressure is applied
Filled vacuum cleaner bags, as defined in section 1.2, are placed in the test chamber with a clean air flow and are subjected to levels of defined pressure. Any resulting dust emissions are measured with a scattered light particle counter and the peak value is recorded.
a) To define the tightness of the sealing ring, a closed round metal support is entered approx. 20 mm into the opening. While applying a fixed level of pressure, the fine dust emissions due to leakage between the pipe and the seal can be recorded.
If the tightness of the seal is insufficient, dust from the bag can escape into the bag chamber while the vacuum cleaner is in operation. When the chamber is opened, this dust, consisting partly of fine dust particles, is then released. This test determines the tightness of the seal and therefore the consequent risk of dust exposure for the user when changing the bag.
b) The pressure test to gauge the tightness of the closed bag seal is performed as a drop test in the test chamber. A full bag is dropped specifically into a clean, empty bin and an emission measurement records any dust leakage.
By performing this test, we can gauge the level of dust exposure a person is subjected to when disposing of the bag.