The role of non-woven fabric breathability in textile production

Update:04 Dec 2020

Non-woven fabrics are named after they are not woven in […]

Non-woven fabrics are named after they are not woven into fabrics. They are a new generation of environmentally friendly materials. They are breathable, flexible, non-toxic, tasteless, and inexpensive. They are used in many fields, such as agricultural films, shoemaking, leather making, and beds. Mats, chemicals, automobiles, building materials, etc. In addition, in the medical and health industry, it can be used to produce surgical gowns, protective clothing, plasters, disinfection packaging, masks, sanitary napkins and other products. Among the many applications of non-woven fabrics, good air permeability is one of the important reasons for its widespread use. Taking related products in the medical industry as an example, if non-woven fabrics have poor air permeability, plasters made from them The inability to satisfy the normal breathing of the skin causes the user to have allergic symptoms. The poor air permeability of medical tapes such as band-aids can cause microorganisms near the wound to multiply and cause wound infection. The poor air permeability of protective clothing will greatly affect its wearing comfort. Similar to medical products, the poor air permeability of other non-woven products will also bring many disadvantages to its use. Therefore, strengthening the detection of the air permeability of non-woven fabrics is one of the important measures to ensure that the related products produced by them meet the requirements of use.

Testing base:

The air permeability (air permeability) involved in the test is to characterize the ability of air to pass through the sample. The test process can be based on the method standard gb/t 5453-1997 "Determination of Air Permeability of Textile Fabrics", which is applicable to a variety of textile fabrics, including Technical fabrics, non-woven fabrics and other breathable textile products.

Test principle:

There are two main methods for testing air permeability, namely constant differential pressure measurement flow and constant flow measurement differential pressure. Among them, the constant pressure difference measurement method is to maintain a constant pressure difference on both sides of the sample, and calculate the air permeability of the sample by measuring the air flow through a given area of ​​the sample within a certain period of time; the constant flow rate measuring the pressure difference The rule is to keep the air flow rate vertically passing through the sample constant, and obtain the air permeability of the sample by measuring the pressure difference between both sides of the sample under this condition. The detection process in this paper adopts the method of constant pressure difference measurement.

Device parameters:

1. The differential pressure measurement range is 0 ~ 1 kpa, and the flow measurement range is 0 ~ 1800 l/h.

2. Two measurement methods of constant pressure difference and constant flow are available for users to choose freely to meet different testing requirements.

3. High-precision electronic airflow and air pressure sensors ensure the accuracy of test data.

3. The system adopts microcomputer control, liquid crystal display, with menu-style interface and pvc control panel, which is convenient for users to quickly conduct test operations and data viewing.

Scope of application:

(1) It is suitable for the air permeability test of textile materials, such as cloth, non-woven fabric, etc.

(2) It is suitable for testing the air permeability and air resistance of automotive interior materials, such as polyurethane, pvc, leather, textiles, non-woven fabrics, etc.

(3) It is suitable for air permeability testing of high polymer porous elastic materials, such as sponges.

(4) is suitable for air permeability testing of leather materials.

(5) can also be extended to test the air permeability of paper materials, such as daily pumping paper, roll paper, etc.

(6) It can meet multiple national and international standards, such as gb/t 5453, iso 9237, iso 4638, iso 5636, gb/t 10655, gb/t 4689.22, gb/t 13764, astm d737, tappi t460, jis p8117 Wait.

Experimental procedure:

(1) Randomly cut 10 samples with a diameter of 50mm (the diameter of the sample can be selected according to the specific situation) from the surface of the medical non-woven fabric sample.

(2) Take one of the samples and clamp them in the air permeability tester to make the sample flat, without deformation, and have good sealing properties on both sides of the sample.

(3) Set the pressure difference value on both sides of the sample according to the air permeability of the sample or relevant standards. The pressure difference value set in this test is 100pa. Adjust the pressure control valve to adjust the pressure difference between both sides of the sample. When the pressure difference reaches the set value, the test stops. The device automatically displays the gas flow through the sample at this time.

(4) Repeat sample loading and adjust the pressure control valve operation until the test of 10 samples is completed.

Test results:

The air permeability test result of the medical non-woven fabric sample tested this time is 16.13 l/h (the result is the average of the test results of 10 samples). The difference in the sample diameter and the set pressure difference will affect the test results. Therefore, if you want to compare the air permeability of different non-woven fabric samples, you should keep the sample diameter and the pressure difference on both sides consistent.

Breathability is one of the excellent properties of non-woven materials, and it is an important factor affecting the safety, hygiene and comfort of non-woven products. In this paper, the air permeability tester is used to test the air permeability of medical non-woven fabrics. The test process is simple, the equipment is easy to operate, the test results are repeatable and accurate, and the test accuracy is high, which can truly reflect the test samples. Breathability.

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