How to choose esd fabric for anti-static clothing
Since our country has not formulated the corresponding testing standards for ultra-clean fabrics or clean clothes, the selection of anti-static ultra-clean fabrics can only be selected by each application unit according to the requirements of the operating environment or after testing or experience. Powerful users can spend hundreds of thousands to purchase a complete set of equipment. In an environment with the same cleanliness as the actual application environment, each batch of clean clothes is tested according to ISO standards. Most users can only make choices based on experience (including the experience of others). To learn to choose ultra-clean fabrics correctly, we must first understand some basic knowledge about fabrics.
Woven fabrics are made by interweaving yarns in warp and weft directions with a specific arrangement density and a specific organizational structure. In a nutshell, it is what raw materials are used, how many stretches are arranged, and what patterns are woven into. To weave anti-static ultra-clean fabrics, conductive fibers must also be added. Here, yarn, (warp and weft) arrangement density, fabric organization and conductive fiber are the four elements of anti-static ultra-clean fabrics. The choice of anti-static ultra-clean fabric is to compare the four elements of the fabric according to the cleanliness requirements of the working environment.
Identification of ultra-clean fabrics for anti-static clothing
Measure the warp and weft density: use the warp and weft density mirror to measure the warp and weft density of the fabric and compare them.
Resistance measurement: use a surface resistance tester to measure the warp and weft resistance of the fabric and compare them.
The principle of comparison is:
Choose a relatively small resistance;
If the resistance is the same, choose a stable resistance value;
Pay attention to distinguish whether antistatic agent is added to the fabric after finishing (applicable to conductive silk with conductive fiber only in the warp direction, commonly known as striped cloth). The method is to use a surface resistance tester to measure the resistance in the warp and weft directions respectively, if the same, Explain that with the addition of antistatic agent, the measured resistance does not represent the true level.
Look at the microstructure: use a high-powered magnifying glass to see the quality of the cloth surface, compare the size of the gap between the fibers (related to the dust filter rate), see whether there are attachments on the fiber surface (related to the amount of dust), and see whether the fiber arrangement is neat and tight (If the elasticity is inconsistent, the loose part of the fiber will be easily sanded during wearing and washing, and it will be dusty when wearing it later).
Check the conductive fiber: Conductive fiber is the key raw material in the anti-static ultra-clean fabric. Checking the conductive fiber is to see whether the conductive fiber is added according to the specification and what kind of conductive fiber is added.
The inspection method is: use scissors to carefully cut the fabric along the edge of the black conductive fiber, and separate the black conductive fiber, use a magnifying glass to observe whether there are one or several thick fibers in it, and use the surface resistance test Test the electrical resistance of the separated conductive fiber. By removing a few in a row, it can be basically judged whether each black thread in the fabric contains conductive fibers. (The conductive silk is made of carbon organic conductive fiber, which is black or gray, generally around 20D, between 1F and 6F. In order to meet the strength requirements when weaving, a common black or white polyester is required. fiber).
Comparing fabric process parameters: The supplier is required to provide the basic parameters of the fabric, such as yarn size (how much D, how much F), warp and weft density, fabric structure, finished width, dyeing shrinkage and what kind of conductive fiber is used.