Explanation of the application of air permeability tester in nonwovens industry

The air permeability tester is mainly used to measure the strength (burst resistance) of textiles, knitwear, paper, etc. when damaged due to various external forces, to test the breathable and comfortable performance of fabrics, and to ensure the quality and health of textile clothing. The air permeability of a fabric refers to the volume of air passing through a unit area of ​​the fabric per unit time under a certain pressure difference (the unit is m2·s). General clothing fabrics have a certain degree of breathability, because the human body breathes all the time, and the breathability of clothing fabrics only provides a channel for gas exchange between human skin and the outside world. At the same time, the breathability of clothing fabrics also promotes the heat dissipation of the human body, thereby keeping the human body comfortable. On timeCurrently, fabric air permeability testing requires the use of specialized air permeability testing instruments, and the air permeability tester can complete this work.

Non-woven fabric is a new type of material composed of chemical fibers and plant fibers on wet or dry paper machines using water or air as the suspension medium. The application areas of nonwovens include medical and health nonwovens, home decoration nonwovens, clothing nonwovens, industrial nonwovens, agricultural nonwovens and other nonwovens. . Among them, the breathability performance test, a key indicator for physical index testing of nonwovens, is particularly important for the practical application of the product. Air permeability (air permeability) involved in relevant national standards is to characterize the capacity of airto enter the sample and is carried out in accordance with the provisions of GB/T. Air permeability is the air flow rate or rate of flow through a portion of the filter media measured at a specific pressure loss. In some testing methods, air permeability is synonymous with air permeability. Some methods detect this by fixing the air flow and detecting the pressure loss. The testing process can be based on the GB/T standard method \"Determination of Air Permeability of Textile Fabrics\", which is applicable to a variety of textile fabrics, including industrial fabrics, non-wovens and other breathable textile products. Air permeability testing methods are mainly divided into constant pressure difference measuring flow rate and constant flow measuring pressure difference. The constant pressure difference flow measurement method consists of maintaining a constant pressure differenceaunt both sides of the sample and calculate the air permeability of the sample by testing the air flow through a given area of ​​the sample in a certain period of time; constant flow pressure difference measurement The rule refers to keeping the vertical air flow passing through the sample constant and testing the pressure difference on both sides of the sample under these conditions, the air permeability of the sample is obtained.

The application of air permeability tester for testing the air permeability of non-woven fabrics should refer to the required standards according to GB/T standard, including the name and model of the test material, test conditions. , test area, test pressure and number of tests, breathability, individual test results, average values, special observations made on the test material or during the test.

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