Clean rooms (anti-pollution) use textiles to protect the indoor environment from the human body (wearers). Every human body has to shed 1 billion skin cells throughout the day and night. The human body and its clothes also carry a lot of dust, ions, hair, textile fiber fluff, cosmetics, spices, cigarettes, etc., which are not tolerated in the process of producing high-tech products. . Cleanrooms are used to keep indoor air clean and prevent contamination of the products they produce. These products may be food, pharmaceuticals, microelectronics, spacecraft components, optical and automotive components. Each industry's pollution capacity requirements for their respective fabrics are different.
Anti-pollution textiles also protect the wearer from hazardous materials in the clean room. For example, the environment in which solvents are used in high-purity pharmaceutical production and semiconductor manufacturing has a harmful effect on workers. The textiles used in clean rooms should be free of fluff, antistatic, and protected from human hair or metabolic dander. .
(1) Classification of clean rooms and types of clothing required
(USA) The Environmental Protection Science Society (1ES) recommends a variety of types of clothing for use in clean rooms. The smaller the number of grades, the higher the environmental cleanliness.
(1) Class 100000 clean rooms usually require a hat or headscarf to wrap the hair, the beard is not exposed, wear a jumpsuit or a zipper gown, a bootie and gloves. 100000 represents the number of dust particles of 1.0 μm and above in 1 cubic foot of air. Sites with a rating greater than 100,000 are generally not considered clean rooms.
(2) Class 10000 clean room requires the hat to be changed to a cap on the basis of level 100000.
(3) Level 1000 clean room requires the zipper gown to be changed to a closed jumpsuit.
(4) Level 100 environment with a mask.
(5) The level 10 environment must completely isolate the face.
(2) Fabrics for clean room clothing
Fabrics for clean room clothing, organic fabrics, nonwovens and laminates. The fabric used in clean room clothing requires that the diameter of the dust particles to be carried is not more than 0.2 μm.
The woven fabric is woven from a multifilament. Cleanrooms never use staple or natural fabrics because they produce large amounts of fiber fluff. The important characteristics of fabrics used in clean rooms are retention (filtration) of pollutants, gas permeability, moisture vapor transmission rate, abrasion resistance and electrostatic decay. Its representative air permeability is 1 to 45 cubic feet per minute, and typical filtration efficiency for 0.3 to 0.5 μm particles is 15 to 60%. Woven fabrics can also be used to control electrostatic discharge (ESD).
Polyester filaments are widely used in woven anti-pollution garments, which can be easily sterilized with gamma rays. Other materials include coatings and laminates such as Tyvek and Gore-Tex, as well as some antistatic fabrics. Tyvek is a polyethylene spunbonded non-woven fabric, which has no lint, high strength and good wear resistance. It is suitable for use in clean workshops. This product is easy to disinfect and has excellent performance of intercepting particles. Another material used in the clean room is Kleen-guard from Kimberly-Clark Corporation, which is a hot melt compounded material of spunbond/meltblown/spunbond nonwoven fabric of polypropylene fibers.
Conductive materials such as carbon fiber, nickel or aluminum fibers can be used as clean room fabrics to control static electricity, which is required in the production of semiconductor components and microchips. It is also possible to prevent sparks in an environment with a possibility of burning. A fabric woven from bicomponent fibers having a core of a conductive material has antistatic properties. In general, the fabric of clean room clothing should be inherently flame retardant, and the chemical resistance of such clothing is also essential.
When making garments for cleanrooms, loose edges, holes, cracks, and other means of dissipating particles from the wearer or garment into the air should be eliminated. The trimming edge should be edged first, or melted and then folded in, then sealed with a lock stitch or a piping seal. Some spaces where dust particles are easily accumulated, such as pockets, straps, pleats, folded collars or hem cuffs, logos, border prints, and pencil cases should be avoided. The neckline and collar edges should be overwrapped and then stitched. This type of clothing is usually sewn with a low-deformation filament sewing thread. Some companies use ultrasonic bonding to suture, essentially eliminating the penetration of contaminants from the needle eye.
Felt Board,Aluminium Frame Board,Aluminum Composite Board,Aluminum Frame Notice Board
Dongguan Aoxing Audio Visual Equipment CO.,Ltd , https://www.aoxing-alr.com