Textile Testing Instruments - Analysis of Factors Affecting Moisture Permeability Testing

Update:30-09-2018
Summary:

One of the important indicators for measuring the comfo […]

One of the important indicators for measuring the comfort of a garment is the moisture permeability of the 3D Printing Fabrics, that is, the ability of the fabric to transfer the body's natural discharge of moisture to the external environment. It is measured by the amount of test water vapor passing through the fabric sample. Today, Xiaobian will introduce the influencing factors of the moisture permeability test.

The moisture permeability test refers to the moisture permeability of the fabric at different ambient temperatures, which is equivalent to simulating the sweating state of the human body under different active conditions. Moisture permeability is divided into: positive cup method and inverted cup method. The positive cup method simulates the moisture permeability of the fabric worn by the human body during static or a small amount of exercise, and generally the amount of sweat discharged by the human body is small. The test of the inverted cup method simulates the moisture permeability of the human body under severe exercise conditions. The amount of sweat in the human body has increased dramatically, and the fabric is in direct contact with the sweat on the human skin.

Moisture permeability test method:

1. Equipment and reagents used

Fabric moisture permeability tester (with circulating gas flow rate: 0.3-0.5 m/s in size), desiccant (drying for 3 hours before use), distilled water.

2. Test principle:

The principle of moisture permeability test is to use a moisture permeable cup with a desiccant or distilled water, and seal the fabric sample, and place the moisture permeable cup assembly in a sealed environment with a specified temperature and humidity, according to the weight of the moisture permeable cup assembly within a certain period of time. The change in moisture is calculated.

The difference between the moisture absorption method and the evaporation method is the humidity of the opposite surface and the relative humidity in the moisture permeable cup: the moisture absorption method is 0%, and the evaporation method is 100%. The relative humidity of the moisture permeable meter sets the humidity of the sample. The results obtained by different test methods are also different. According to the requirements, a test method that can truly reflect the actual moisture permeability of the fabric is selected.