ESD cleanroom garment

10/09/2021
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ESD cleanroom garment is to prevent electrostatic accumulation of clothes, sewing with anti-static fabric for fabric, suitable for clothing wearing electrostatic sensitive places or fires or explosive hazardous places, applied to electronic, optical instruments, pharmaceutical, microbial projects , Precision instruments and other industries.
Anti-static ultra-clean fabric used in anti-static clothing is often referred to as "conductive silk". In fact, this statement is not strict, and the conductive silk can be divided into anti-static (ESD) according to its own technical characteristics, as well as the Clean Room, only suitable for the cleansing chamber, can be called It is an anti-static ultimate fabric.
What is anti-static fabric? A anti-static fabric can be referred to as an anti-static machining treatment. The anti-static processing method of fabrics usually:
1 After the fabric has been organized by antistatic finishing agents;
2 to improve the fiber graft modification of the fabric hygroscopicity, the blending and interleaving of hydrophilic fibers;
3 blended or woven conductive fibers;
The mechanism of the first two types of methods is to improve the resiliency of the fabric, reduce insulation, and accelerate electrostatic leakage. Therefore, if the processing effect is or not durable, or the processing effect or does not durable, or is not significant, it is usually applied to the fabric for ordinary clothing. Only the third method is sustained, efficiently solving the static problem of textiles, so it is widely used in the production of anti-static overalls. The fabric finishing the antistatic finishing agent.
The anti-static fabric can be a woven fabric, such as a conductive silk, an anti-static T / C fabric, or a knitted fabric, such as anti-static knitting briquette, anti-electric knit underwear, etc. In addition to the general technical standards of textiles, anti-static fabrics must also have good anti-static properties to suit product production and safety needs. Technical requirements can be referred to GB12059-89 "Electronic Industry Synthetic Fiber Anti-Static Silk Performance
Differences between ultra-clean fabrics and ordinary anti-static fabrics in anti-static clothes
The difference between anti-static ultra-clean fabrics and ordinary anti-static fabrics is mainly "ultra-net" concept. Anti-static ultimate fabric must have the following three characteristics:
Have anti-static function: static electricity can adsorb dust, and make the dust that the dust is not easily blown when the dust is in the wind. Therefore, the primary feature of anti-static ultimate fabrics has antistatic properties. At the same time, this anti-static performance must be lasting, efficient, and does not significantly attenuate due to daily washing and friction.
The fabric itself is not dust: Since it is dressed in the clean room, it requires that the fabric cannot be a dust source in a clean room, which determines that the ultra-purity fabric can only be produced by chemical synthetic long fibers. Natural short fibers such as cotton, hemp, and silk cannot be applied to ultra-net fabrics, although these raw materials can make the fabric better taken. At the same time, the chemical fiber filaments selected will also strictly control the amount of dust. Generally speaking, full-transparent polyester filaments are not suitable for weaving static ultra-purity fabrics. Because the extinct agents added in polyester production - titanium white powder will become a source of pollution.
The fabric must have good light filter: clean indoor dust mainly from the indoor flowing air and the human body in indoor activities. When the equipment conditions are determined, improvement of cleanliness is to maximize the minimal dust generated by the human body in the clothes, so that it passes through the fabric into the air. This is the so-called filter rate of the fabric. Increasing the filter rate is based on the gas permeability of the sacrificial fabric, so knitted fabric and woven woven fabric is not suitable for clean room.
Fabric selection editorial voice
Since our country has not yet developed the corresponding ultra-clean fabric or clean-uniform testing standards, the selection of anti-static ultra-clean fabrics can only be selected according to the requirements of the work environment or by testing or by experience. Powerful users can spend hundreds of thousands to purchase a complete device, in the same environment as the actual application environment, according to ISO standards for each batch of clean clothes. Most users can only choose from experience (including others' experience). To learn to choose the ultimate fabric correctly, you must first understand some basic knowledge about fabrics.
The woven fabric is made of a particular tissue structure in accordance with a particular tissue structure by a yarn in the two directions of the two directions. In summary, what is the use of raw materials, how much row is tight, what is woven. To weave anti-static ultra-purity fabrics, there must also be added to conductive fibers. Here, yarns, (latitude latitude) arrangement density, fabric tissue and conductive fibers are four elements of anti-static ultra-clean fabrics. The use of anti-static ultra-clean fabrics is based on the four elements of the fabric according to the cleanliness of the work environment.
Differentiation of anti-static suits
The latitude and weft density: the latitude and latitude latitude and latitude density of the fabric were measured, and compared.
Measurement resistance: The surface resistance tester is used to measure the direction of the fabric and the weft resistance of the fabric, and compare it.
The principle of comparison is:
Selecting the resistance is relatively small;
If the resistance is the same, select the resistance value stable;
Note that the difference is to add anti-static agents when it is finished (for conductive silk, commonly known as the striped fabric), and the method is to measure the electrical direction and weft resistance by surface resistance tester, such as the same, Note that there is an antistatic agent, then the measured resistance is not true.
See the microstructure: see the quality of the layout with high magnification, compare the gap size between the fibers (related to the dust level), see if the surface of the fiber has attached matter (related to the dust), see if the fiber arrangement is neat, (If the elastic inconsistency is easy to abrasive when wearing and washing, it will be dusty when wearing it.
Check the conductive fiber: Conductive fibers are key raw materials in anti-static ultra-clean fabrics, checking that the conductive fibers are to see if the conductive fibers are added in accordance with specifications and what conductive fibers are added.
The method is to cut the fabric with a scissors to cut the fabric along the edge of the black conductive fiber, and the black conductive fibers are separated, and it is observed with a magnifying glass to have a more coarse fiber, and test surface resistance test The gear is measured the resistance of the separated conductive fiber. After continuous demolition, it can basically determine whether each black wire in the fabric contains conductive fibers. (The conductive silk is used is carbon organic conductive fiber, black or gray, generally around 20d, between 1F ~ 6F. In order to achieve the strength requirements of the weave, a normal black or white polyester is required. fiber).
Contrast fabric process parameters: Require supplier to provide basic parameters of fabrics, such as yarn fibers (how much D, how much f), latitude latitude, fabric tissue, finished door, dyeing ratio, and what conductive fibers are used.
Power consumption editor
Anti-static career is referred to as the prevention of static accumulation on clothing, sewing in overstures with anti-static fabrics. Anti-static fabric is a fabric that is substantially equal or uniformly mixed into the conductive fibers or antistatic synthetic fibers or mixed into the conductive fibers or antistatic synthetic fibers. Conductive fibers refer to all or part of a fiber made of a metal or organic material or a sub-conductive material made of a volume resistivity ρv to between 104 to 109 Ω / cm.
Practice shows that anti-static overalls can effectively suppress static electricity, eliminate or reduce electrostatic discharge hazards. The following table gives the comparison of the human bullet charge when the operator wears different work clothes.