Basic knowledge of non-woven fabrics

Basic knowledge of non-woven fabric 1. Definition of non-woven fabric Non-woven fabric, also known as non-woven fabric (nonwoven), non-woven fabric. Oriented or randomly arranged fibers are combined with each other through friction, entanglement or bonding or a combination of these methods to make a sheet, web or batt. Excludes paper as well as woven fabrics, knitted fabrics, tufted fabrics, stitched fabrics with stitched yarns and wet felt products (regardless of whether such products have been reinforced by needle punching). The fibers can be natural or chemically processed, and can be short fibers, filaments or fibers formed on the spot. Note: 1. The difference between wet-laid non-woven fabrics and wet-laid papermaking is that non-wovens should meet one of the following conditions: a. Fibers whose fiber composition has a length to diameter ratio greater than 300 (excluding chemically cooked plant fibers) ) Occupies more than 50% of the mass; b. The fiber whose length to diameter ratio is greater than 300 in its fiber composition (excluding chemically cooked plant fibers) occupies more than 30% of its mass, and its density is less than 0.4/cm⒊2, not considered Viscose fiber is a plant fiber that has been chemically cooked. 2. Fiber raw materials There are many types of fiber raw materials suitable for non-woven fabrics, mainly including natural fibers and chemical fibers. In order to make non-woven fabrics with different properties, uses and styles, high-performance special fibers and functional and differentiated fibers can also be used. (1) Natural fibers: such as cotton, wool, hemp, silk, etc.; (2) Chemical fibers: such as viscose fiber, polyester, nylon, polypropylene, acrylic, vinylon, etc.; (3) Differential fibers, high-performance fibers; : Low melting point thermal bonding fiber (ES fiber, modified polypropylene, copolyamide, copolyester, etc.); ultrafine fiber (fineness less than 0.3dtex); three-dimensional crimped hollow fiber; colored fiber; high-performance fiber (carbon fiber, aramid fiber) , Polyphenylene sulfide, polyether ketone, etc.); water-soluble fiber (water-soluble polyvinyl alcohol fiber, hydroxymethyl cellulose fiber, etc.) 3. Non-woven fabric products and applications (1) Medical and health non-woven diapers Fabrics for sanitary napkins; surgical gowns, cap covers, shoe covers, masks, face masks, hospital patients, bed sheets, mattresses, pillowcases, anti-bacterial cords; wet towels, cotton balls, disinfection wraps; white blood cell separation materials, artificial Skin; basic materials for use of labor protective clothing in radiation situations; medical tape base cloth, bandage base cloth, wound dressing, wound cushion, blood sucking cloth. (2) Non-woven fabrics for home decoration; carpets and floor materials; carpet base fabrics; curtains and curtains; tablecloths, bedspreads, wall coverings; mattresses and furniture covering cloths; artificial turf. (3) Non-woven fabrics for clothing Decorative linings of various clothing; warmth-keeping flakes for winter clothing; clothing accessories for outerwear and underwear (clothing labels, laces, bras, shoulder pads, etc.). (4) Footwear and imitation leather. Non-woven fabrics and artificial suede; inner lining of shoes, leather bags and suitcases; intermediate lining and supporting (reinforcement) materials. (5) Filter material Conventional filter material: used for air conditioners, kitchen smoke filters, beverage liquid filtration, etc.; high temperature resistant and corrosion resistant filter material: used for filtering high temperature and corrosive exhaust gas and dust discharged from industrial furnaces and kilns. (6) Geotextile geotextile for underground drainage and irrigation seepage; geotextile for separation and reinforcement in road and railway construction; geotextile for bank slope and dam reinforcement; geotextile for bridge engineering; waste storage pool; impermeable geotextile for artificial pool ; Waterproof asphalt bottom cloth. (7) Non-woven seat covers, sun visors, soft door cushions, roof and luggage compartment cushions and covering materials, heat and sound insulation materials, vaporizers, air filters, and tufted carpet base fabrics for the automotive industry; Needle-punched loop-type molded carpet and sofa cushion material. (8) Non-woven fabrics for industrial use. Oil-absorbing materials for port sea surface degreasing and oil recovery in offshore oil production areas; electrical insulation materials; battery separator cloth; industrial polishing materials; fiberglass reinforced plastic substrates, industrial tape substrates, industrial hoses Substrate. (9) Agricultural non-woven agricultural harvest cloth, frost-proof cloth, insect-proof cloth, soil moisturizing cloth, seedling growing cloth, greenhouse. (10) Non-woven fabrics for household goods Wipe cloth, shoe cloth, suit cover, furoshiki cloth, bedding collection bag, pillowcase, chair sand cover, gift bag, tea bag, kitchen filter residue, water filter bag. (11) Other non-woven fabrics Disk liners; coated bottom fabrics; packaging materials; special paper (high-quality paper for printing money, certificates, map fabrics, calendar fabrics, and calligraphy fabrics for oil trucks)