The Standard Requirements of Fabric Wet and Dry Friction
1.What is Fabric Wet and Dry Friction?
Fabric wet and dry friction measures the abrasion resistance and friction of fabrics in both dry and wet conditions. This is done under specific test conditions, either using machines or manually simulating the friction experienced by the human body during use. The wet and dry friction performance of fabrics depends on various factors, including the material, weaving process, and both physical and chemical properties.
II. Standard Requirements for Dry and Wet Friction of Fabrics
1.Standard Requirements for Dry Friction
The international standard ISO 105-X12:2016 outlines a standard method for measuring dry friction. In this test, wear is assessed over three time periods: 10 seconds, 20 seconds, and 50 seconds. The test employs a specified friction head, load, speed, and distance. Abrasion resistance is evaluated based on the wear rate of the fabric, with ratings ranging from 1 to 5; higher values indicate better abrasion resistance.
2. Wet Friction Standard Requirements
The wet friction test is performed under specific conditions regarding water temperature and moisture content. The international standard ASTM D3884 outlines the standard procedure for wet measurements. This test consists of three time intervals: 10 seconds, 20 seconds, and 40 seconds. The level of abrasion resistance is assessed based on the abrasion rate, which is graded on a five-point scale from 1 to 5, where higher values indicate greater abrasion resistance.
3. Standard Requirements for Coefficient of Friction
The coefficient of friction is a physical quantity that measures the resistance an object encounters when sliding against a surface. When designing garments, the coefficient of friction of a fabric is an important factor, as it affects the comfort and breathability of the material. The Swiss standard SNV 195 622 defines the standard requirements for the coefficient of friction of various fabrics, including snakeskin, PU-coated fabrics, polyester/cotton blends, and several synthetic fibers.
How to Evaluate the Wet and Dry Friction Performance of Fabrics
1.Abrasion Rate
The abrasion rate of fabrics is a crucial factor in assessing their wet and dry friction performance. A lower abrasion rate indicates better abrasion resistance and a longer service life for the fabric.
2. Coefficient of Friction
The coefficient of friction is another important criterion for evaluating a fabric's friction resistance. Generally, a smaller coefficient of friction signifies that the fabric is more breathable, soft, and comfortable.
Conclusion
The wet and dry friction performance of fabrics is a key indicator of their abrasion resistance, durability, and comfort. Understanding the standard requirements and evaluation methods for fabric friction is essential for those involved in purchasing and designing garments. When selecting fabrics, it is important to choose materials that align with specific needs to ensure both the quality and comfort of the finished garment.
