Anti-static overalls are special work clothes with dust-free and anti-static properties applicable to electronics, optical instruments, pharmaceuticals, microbiology engineering, precision instruments and other industries. The cloths are generally synthetic fiber fabrics with inlaid woven conductive yarns, and the management of clean work clothes is the most An important part is cleaning. Although the fiber itself is a clean fiber that is difficult to contaminate, how to maintain it is an important factor. That is the cleaning method. If the ordinary washing method is used, it will certainly be contaminated. So you must use a special method. Clean work clothes, from the management point of view, must also be cleaned in the clean room when washing. Normally, cleansing work clothes are washed at least once a week, and some high-demanding jobs are even washed once a day. When cleaning in a normal room, dust and bacteria are attached, as well as contamination by detergents. In addition, dust and micro-organisms are also attached during packing and handling. The cleaning of clean work clothes generally depends on professional cleaning companies for cleaning.
First, the cleaning process should pay attention to matters
(1) Newly-stitched cleansing uniforms can be washed directly, and the recovered cleansing uniforms are found to contain oil stains. Care should be taken to remove oil stains before proceeding with the washing process.
(2) Check the accessories such as fraying, damage, and buckles before washing, and repair, replace, or scrap the defective parts.
(3) It must be cleaned, dried, and packed in a clean room with a higher degree of cleanliness than a clean room using work clothes.
(4) Water for wet and dry cleaning is filtered. After the solvent is distilled, a filter with a pore size of less than 0.2 μm is used at the point of use, and if necessary, filtration is performed more than once.
(5) In order to remove water-soluble contaminants, after washing with fresh water, the final solvent was washed with distilled solvent to remove oily contaminants.
(6) Wet washing water temperature is as follows:
Polyester cloth 60-70C (up to 70C)
Nylon cloth 50-55C (up to 60C)
(7) In the last rinsing of water, antistatic agents may be used to improve the antistatic properties, but the antistatic agent used should be well-bonded with the fibers and free of dust.
(8) Work clothes with buckles should be washed in the buckled state.
(9) Drying is performed in a dedicated clean air circulation system.
After drying, it is folded in a clean room for washing, packed in a clean polyester bag or nylon bag, and can be packed in double layers upon request. It can also be vacuum sealed. The packaging material is preferably made of a material with good antistatic properties. Since the folding process is most likely to generate dust, the folding process must be carried out in a high-level clean room. For example, a 100-level clean work clothes fold package should be carried out in a class 10 environment.
Second, the performance of clean work clothes detection 1 purification performance test clean clothes inside the clean work clothes used inside and outside the attachment of contaminated particles, using the following four methods: ASTM F-51 method (microscopy), F-51 repair method (counting method), HELMKE drum method (drum method, equivalent to ASTM test method) and vibration test method (vibration method).
(1) ASTM-F-51 method (microscopy)
The test probe is equipped with a filter diaphragm and is directly connected to the suction metering pump. The amount of air passing through is 28 L/min. During the test, air was allowed to pass through the test cloth, dust-laden particles contained in the air were caught on the filter for the test, and the number of dust particles was observed and counted using a 400-fold microscope. Read the number of particles above 0.5-5 and above on the filter membrane. A 3.08mm grid is printed on the filter to read the number of particles in a grid.
(2) ASTM-F-51 revised method (counting method)
Air was passed through the test cloth, and the particle size and number of dust particles were measured with a particle counter. The sample was placed on a gantry with a wire mesh and contacted with a sampler (replaced with a 47mm filter holder). The amount of air passing through was 28 L/min.
(3) Helmke Drum Test
The sample was placed in a rotating drum with an open side and rotated. The dust particles were sampled from the barrel and the particle count was used to determine the level of cleanliness. The size of the rotating drum is 43cm x 33cm, there are 4 blades on the inner side of the barrel, and the number of rotations of the barrel is 10 rpm.
(4) Vibration method The sample was placed in a small chamber and particles were generated by vibration torsion and measured with a particle counter. At the same time, particles with a large particle size (25 or more) were trapped on the filter and the number of particles was read. The air volume is 3.5 feet/minute (0.099 m/mim) and the number of vibrations is 150 beats/minute.
In China, there are no national standards for the dust-free performance testing of clean work clothes. Reference may be made to the Japanese Industrial Standard JIS-B-9923 studied by the Japan Air Cleaning Association Special Committee and the US IES Standard RP-CC-003-87-T. For the assessment of dust-free performance, various industries can use the cleanliness standards specified in the international standard ISO/TC209, combined with their respective cleanliness levels.
2 Antistatic performance testing Antistatic property is an important characteristic of clean workwear, especially in the microelectronics and other industries more stringent antistatic performance requirements for clothing. The test method can be based on the National Standard GB/T12703-91 of the People's Republic of China, “Electrostatic Test Methods for Textilesâ€. Since the fabric used for clean workwear is a polyester filament fabric with a woven conductive thread, only the frictional electrification voltage (B) is used in this standard. Method), charge surface density (C method) and frictional charge of work clothes (E method) are suitable for the detection of antistatic performance of clean work clothes. Also refer to the People's Republic of China National Standard GB/T12059-89 "Synthetic Fiber Antistatic Silk Performance and Experimental Methods for Electronic Industry".
(1) Frictional charged voltage method The test principle of this method is to make the sample and the standard cloth rub against each other under a certain tension condition, and evaluate the triboelectric charging relationship between the wearer and the garment with the highest voltage and average voltage generated at that time. The method is to use sample (4 pieces, 2 warps, 2 wefts, size 4cmX8cm) to clamp the sample on the drum (outer diameter 150±1mm, width 60±1mm), and rotate the drum to 400rpm. The cloth (nylon or polypropylene) is rubbed, and the maximum value of the charged voltage (V) of the sample within 1 min is tested.
(2) Charge surface density test specimens are rubbed with nylon standard cloths in specified manner under specified conditions.
First, the cleaning process should pay attention to matters
(1) Newly-stitched cleansing uniforms can be washed directly, and the recovered cleansing uniforms are found to contain oil stains. Care should be taken to remove oil stains before proceeding with the washing process.
(2) Check the accessories such as fraying, damage, and buckles before washing, and repair, replace, or scrap the defective parts.
(3) It must be cleaned, dried, and packed in a clean room with a higher degree of cleanliness than a clean room using work clothes.
(4) Water for wet and dry cleaning is filtered. After the solvent is distilled, a filter with a pore size of less than 0.2 μm is used at the point of use, and if necessary, filtration is performed more than once.
(5) In order to remove water-soluble contaminants, after washing with fresh water, the final solvent was washed with distilled solvent to remove oily contaminants.
(6) Wet washing water temperature is as follows:
Polyester cloth 60-70C (up to 70C)
Nylon cloth 50-55C (up to 60C)
(7) In the last rinsing of water, antistatic agents may be used to improve the antistatic properties, but the antistatic agent used should be well-bonded with the fibers and free of dust.
(8) Work clothes with buckles should be washed in the buckled state.
(9) Drying is performed in a dedicated clean air circulation system.
After drying, it is folded in a clean room for washing, packed in a clean polyester bag or nylon bag, and can be packed in double layers upon request. It can also be vacuum sealed. The packaging material is preferably made of a material with good antistatic properties. Since the folding process is most likely to generate dust, the folding process must be carried out in a high-level clean room. For example, a 100-level clean work clothes fold package should be carried out in a class 10 environment.
Second, the performance of clean work clothes detection 1 purification performance test clean clothes inside the clean work clothes used inside and outside the attachment of contaminated particles, using the following four methods: ASTM F-51 method (microscopy), F-51 repair method (counting method), HELMKE drum method (drum method, equivalent to ASTM test method) and vibration test method (vibration method).
(1) ASTM-F-51 method (microscopy)
The test probe is equipped with a filter diaphragm and is directly connected to the suction metering pump. The amount of air passing through is 28 L/min. During the test, air was allowed to pass through the test cloth, dust-laden particles contained in the air were caught on the filter for the test, and the number of dust particles was observed and counted using a 400-fold microscope. Read the number of particles above 0.5-5 and above on the filter membrane. A 3.08mm grid is printed on the filter to read the number of particles in a grid.
(2) ASTM-F-51 revised method (counting method)
Air was passed through the test cloth, and the particle size and number of dust particles were measured with a particle counter. The sample was placed on a gantry with a wire mesh and contacted with a sampler (replaced with a 47mm filter holder). The amount of air passing through was 28 L/min.
(3) Helmke Drum Test
The sample was placed in a rotating drum with an open side and rotated. The dust particles were sampled from the barrel and the particle count was used to determine the level of cleanliness. The size of the rotating drum is 43cm x 33cm, there are 4 blades on the inner side of the barrel, and the number of rotations of the barrel is 10 rpm.
(4) Vibration method The sample was placed in a small chamber and particles were generated by vibration torsion and measured with a particle counter. At the same time, particles with a large particle size (25 or more) were trapped on the filter and the number of particles was read. The air volume is 3.5 feet/minute (0.099 m/mim) and the number of vibrations is 150 beats/minute.
In China, there are no national standards for the dust-free performance testing of clean work clothes. Reference may be made to the Japanese Industrial Standard JIS-B-9923 studied by the Japan Air Cleaning Association Special Committee and the US IES Standard RP-CC-003-87-T. For the assessment of dust-free performance, various industries can use the cleanliness standards specified in the international standard ISO/TC209, combined with their respective cleanliness levels.
2 Antistatic performance testing Antistatic property is an important characteristic of clean workwear, especially in the microelectronics and other industries more stringent antistatic performance requirements for clothing. The test method can be based on the National Standard GB/T12703-91 of the People's Republic of China, “Electrostatic Test Methods for Textilesâ€. Since the fabric used for clean workwear is a polyester filament fabric with a woven conductive thread, only the frictional electrification voltage (B) is used in this standard. Method), charge surface density (C method) and frictional charge of work clothes (E method) are suitable for the detection of antistatic performance of clean work clothes. Also refer to the People's Republic of China National Standard GB/T12059-89 "Synthetic Fiber Antistatic Silk Performance and Experimental Methods for Electronic Industry".
(1) Frictional charged voltage method The test principle of this method is to make the sample and the standard cloth rub against each other under a certain tension condition, and evaluate the triboelectric charging relationship between the wearer and the garment with the highest voltage and average voltage generated at that time. The method is to use sample (4 pieces, 2 warps, 2 wefts, size 4cmX8cm) to clamp the sample on the drum (outer diameter 150±1mm, width 60±1mm), and rotate the drum to 400rpm. The cloth (nylon or polypropylene) is rubbed, and the maximum value of the charged voltage (V) of the sample within 1 min is tested.
(2) Charge surface density test specimens are rubbed with nylon standard cloths in specified manner under specified conditions.
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â–ª Material: Stainless Steel 304 (1.4301), Stainless Steel 316L(1.4404), etc
â–ª Sealing Material: rubber/ elastomeric o-ring mounted in a centering ring
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▪ Temp.:between ~0° C and 120-180° C
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Quality & Inspection:
â–ª PMI test to verify material grade
â–ª Dimension controlling during fabricating and finished
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