The role of anti-static clothing and anti-static wrist straps in electronic processing enterprises
Anti-static clothing and anti-static wrist straps are an important part of the anti-static system to eliminate the human body, which can eliminate or control the generation of static electricity in the human body, thereby reducing the static electricity generated in the manufacturing process.
The human body protection products in the electronic processing workshop include anti-static coveralls, anti-static split clothing, anti-static gowns, anti-static shoes, hats, anti-static gloves, anti-static finger cots, anti-static wrist straps, etc. Anti-static work clothes are made of different colors of anti-static cloth. The fabric yarn contains a certain proportion of conductive yarn, and the conductive yarn is made by blending a certain proportion of stainless steel fiber or other conductive fibers with ordinary fibers. Eliminate static electricity on clothing through corona discharge and leakage of conductive fibers. As stainless steel fiber is a metal fiber, the antistatic fabric woven from it has stable conductivity, but it does not change with the number of washing clothes.
Anti-static clean clothing is a special protective clothing worn in a dust-free environment. It has the characteristics of anti-static and dust-proof. It is widely used in electronics, pharmaceuticals, food, biological engineering, optics, aerospace and other industries.
The anti-static clean clothes are made of special polyester filaments, conductive fibers inlaid in warp or warp and weft directions, and woven by a special process. There are a variety of colors and specifications suitable for different anti-static or clean environments, including 100D×100D conductive silk suitable for 10,000-300,000 dust-free environment, and 75D×100D small for 1000 dust-free environment Grid, 75D×75D strips, 75D×75D grid conductive silk. Adding a small amount of 9R1 can fully prevent the generation of static electricity and has excellent static electricity control capabilities.
Good washing resistance, bending resistance and abrasion resistance. It has the characteristics of sweat-absorbing, dust-proof, anti-static, no fiber removal, smooth and soft, and good air permeability. The surface resistivity is 10 to the 6th power.
Gown type, split type (jacket type), one-piece type (two-piece type, three-piece type, four-piece type). The selection criteria are: CLASS300000 (choose gown-style clean clothes); CLASS100000 (choose split clean clothes), CLASS10000 (choose two-piece, three-piece clean clothes), CLASS1000 and above (choose three-piece clean clothes or four One-piece clean clothes), of course, which is also related to the choice of conductive fiber. In addition, many pharmaceutical and food companies now adopt the four-piece type, thinking that this is good for dust and bacteria prevention. In fact, there is a problem in it. It is not very convenient to work. When you bend over, you will feel the back being pulled. Uncomfortable at work. It is recommended to use three-piece + a pair of soft-soled boots or hard-soled boots. The dustproof effect will not have any influence.
The anti-static wrist strap is the most important anti-static product for operators when touching electronic components. Through the grounding path, the static charge on the human body can be safely discharged. It is composed of anti-static elastic band, movable snap buckle, spring cord, protective resistor and plug or chuck. The inner layer of the elastic band is woven with antistatic yarn, and the outer layer is woven with ordinary yarn.
Anti-static wrist straps are divided into corded wrist straps, cordless wrist straps and smart anti-static wrist straps. According to the structure, they are divided into single-loop wrist straps and double-loop wrist straps. They are used to discharge static electricity from the human body. Anti-static wrist straps are also called anti-static bracelets and bracelets.
Main indicators: The maximum length of the spring cord is 250cm. Leakage resistance 10^6Ω (protection resistance 10^6Ω).
Classification of anti-static wrist straps: Classified by ground wire material: PVC/PU/silver-plated/carbon-containing materials. Classified by bracelet material: metal, dust-free silicone, rubber band. According to the discharge method classification: ordinary type / double loop / corona discharge.