1. Humidity dependence of antistatic effect. Through antistatic finishing, that is, adding hydrophilic polymer (surfactant) in spinning, the fabric can easily absorb moisture in the air, reduce surface impedance, reduce electrostatic accumulation and release human static electricity in time.
2. Use the conductivity of the fiber. Adding antistatic agent and carbon black particles into the fiber raw material to make it become conductive fiber. Through blending, interweaving, interweaving or embedding, the conductivity of fiber or fabric is improved, and antistatic fabric is generated, so as to realize charge escape and prevent electrostatic accumulation.
3. Blended fabric is made by mixing a certain amount of metal fibers into fibers, which has good stability and washing resistance.
Anti-static work clothes (GB12014-1989) listed in the Catalogue of Special Labor Protection Articles are made of anti-static fabrics to prevent electrostatic accumulation of clothes, and are suitable for wearing in dangerous places of fire or explosion. The manufacturing process of antistatic fabric is mainly to mix antistatic fibers or antistatic synthetic fibers made of conductive materials made of metal or organic matter at roughly equal intervals or evenly, or mix and interweave them during spinning.
classify
According to the place of use and the object of protection, the classification of anti-static work clothes is shown in the following table.
All clean work clothes, anti-static work clothes, anti-static sweaters used as work clothes and worn in dangerous places of fire and explosion are included in the management scope of safety signs.
technical requirement
The technical requirements of anti-static work clothes include structure, anti-static performance and strength.
structure
The structure of clothing production directly affects its anti-static effect. Therefore, the structural design of anti-static work clothes must ensure that:
1. Generally, it is not allowed to use metal ornaments on clothes. When metal buttons and zippers must be used, it should be strictly ensured that the metal ornaments are not exposed directly when worn, so as to avoid sparks caused by discharge and cause fire and explosion.
2. Clothing should all use unlined antistatic fabrics. When lining (pocket, reinforcing cloth, etc.). ) must be used, and the exposed area of the lining should be less than 20% of the exposed area of all anti-static clothes; For winter clothes or other anti-static clothes with special requirements, when the exposed area of the lining exceeds 20% of the exposed area of all anti-static clothes, the mask and lining should be detachable.
Antistatic performance
According to national standards, the anti-static performance of anti-static overalls requires the amount of charge carried by a single garment under certain washable conditions:
symbol
Qualified anti-static work clothes must indicate the manufacturer's name (or factory record), address, product name, trademark, model specification, product grade and production date on each finished product; Each package must be marked with the article number, product name, model, grade, production unit and factory date, and be accompanied by the product instruction manual. The product grade in the manual should be antistatic performance grade, A grade or B grade.
After the implementation of the safety signs of special labor protection articles, it is required to increase the strong and durable safety signs of special labor protection articles in obvious positions.
Equipment and selection
equipment
Anti-static work clothes are mainly used in fire and explosion dangerous places. According to the standard (GB12014-1998 Appendix D), the dangerous places of gas explosion are divided into:
Level 0 area: Under normal circumstances, explosive gas mixture appears continuously and frequently for a short time or exists for a long time.
1 grade area: In general, explosive gas mixture may appear.
Secondary zone: Under normal circumstances, explosive gas mixture will not appear, but occasionally for a short time under abnormal circumstances.
It belongs to level 0 zone and 1 zone of gas explosion hazard site, and the minimum ignition energy of combustible materials is below 0.25mJ Anti-static work clothes should be provided. Common combustible substances with minimum ignition energy of 0.25mJ include alkyl propane, acrylonitrile, ether, hydrogen, carbon disulfide, furan, benzene, methanol, etc. The Rules for Selection of Labor Protection Articles (GB11-1989) requires that A0 1 flammable and explosive places must be equipped with anti-static work clothes; When working in A02 combustible dust place, you can wear anti-static work clothes. The Equipment Standard for Labor Protection Articles (Trial) (No.0/89 of the State Economic and Trade Commission) also requires gas station operators, liquefied petroleum gas canning workers and similar jobs to be equipped with anti-static work clothes.
choose
The antistatic performance of antistatic overalls has certain durability. Therefore, when choosing anti-static work clothes, it is necessary to choose the corresponding anti-static work clothes according to the washing requirements determined by the pollution situation in the workplace.
Anti-static work clothes are used in fire and explosion places, and anti-static work clothes with flame retardant performance should usually be selected to provide more reliable protection for workers. Anti-static work clothes used by gas station operators and similar jobs should also have anti-oil function.
Cotton overalls have anti-static effect, but they may not meet the requirement that the electricity consumption of a single garment required by anti-static overalls is less than 0.6μC, especially after washing, because of the choice of detergent and other reasons, the anti-static effect will be reduced. Therefore, we must be careful when choosing anti-static work clothes made of cotton fabrics, especially in the dry areas in the north.
Quality verification
When selecting anti-static work clothes, you should ask the supplier for the test report, and check the product characteristics, production batch and production date in the test report, as well as whether the cloth samples provided are consistent with the products provided. Because the structure of anti-static work clothes has a great relationship with its anti-static effect, the following points should be paid attention to when checking the ordered anti-static work clothes:
1. Accessories such as buttons, zippers, hooks and buckles of work clothes, preferably non-metallic materials such as plastic and nylon. If metal fittings are used when making work clothes, try to wear them and ensure that the metal fittings are not exposed when wearing and engaging in various activities.
2. Look at the reverse side of work clothes, pockets, welts, reinforcing cloth, etc. And it is better to use antistatic fabrics; Made of other materials, its exposed area should be less than 20% of the exposed area in all anti-static clothes.
3. The cotton inner sleeve and full lining of cotton-padded jacket and full-lined overalls made for cold and warmth or other special requirements should be detachable.
4. Check the antistatic fabric. For the same conductive fiber, the higher the density, the better the antistatic performance.
Maintenance/curing
Packaging, storage and transportation
During transportation, it should be noted that there must be a cover on the anti-static work clothes, and the packaging must not be damaged to prevent sun exposure and high temperature; It is forbidden to drag with a hook during handling.
Anti-static work clothes should be stored in a dry and ventilated warehouse to prevent mildew and deterioration. When stored, it should be more than 200mm away from the ground and walls, and more than 1m away from all heating elements. Direct sunlight should be avoided, and outdoor placement is prohibited.
In the packaging and storage of antistatic wool knitted fabrics, an appropriate amount of moth-proofing agent should be added.
care and maintenance
It is best to use neutral detergent to clean anti-static overalls. Don't mix with other clothes when washing. Use hand washing or washing machine soft washing procedure to avoid conductive fiber breakage. The washing water temperature should be lower than 40℃, and normal temperature water should be used for rinsing. The washing time should be as short as possible, but it must be rinsed sufficiently to remove the residual detergent. Do not use bleaching powder or organic solvents to decontaminate antistatic overalls with flame retardant and oil-proof properties.
Dress precautions
1. Anti-static work clothes must wear anti-static shoes specified in GB4385.
2. It is forbidden to attach or wear any metal objects on the antistatic clothing. Carry-on tools should have anti-static and anti-electric spark functions; Metal tools should be placed in the belt of anti-static overalls, and the metal parts should not be exposed.
3. It is forbidden to wear anti-static work clothes in inflammable and explosive places.
4. Don't wear anti-static overalls in strong electromagnetic environment or areas with high-voltage bare wires nearby.
life
Anti-static work clothes damaged, broken stitches, mildew, broken conductive fibers, or have reached the washing time specified by the anti-static level, should be scrapped in time. Users should sample the anti-static work clothes whose service life reaches half of the service life or whose storage life reaches 1 year, and the products that have lost their anti-static performance after testing should be scrapped in batches in time to ensure that the products are qualified for use.
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