Common sense of polyester: basic knowledge of nonwovens

1. The definition of non-woven fabric Non-woven fabric (nonwoven), also known as non-woven fabric, 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 fabric and wet-laid papermaking is that non-woven fabrics should meet one of the following conditions: a. Fibers whose fiber composition has a length to diameter ratio of more than 300 (excluding chemically cooked plant fibers) ) Account for 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) account for more than 30% of the mass, and its density is less than 0.4/c m⒊2, no It is believed that viscose fibers are plant fibers that have 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) Differentiated fibers, high-performance fibers; such as : 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, polyetherketone, etc.); water-soluble fiber (water-soluble polyvinyl alcohol fiber, hydroxymethyl cellulose fiber, etc.); (four) main chemical fiber and special fiber used for non-woven fabric Classification of Woven Fabrics There are many classification methods for nonwovens, which can be classified according to the processing route of the nonwoven part: the method of web forming and the classification of product uses. The following table is classified according to the different methods of web forming of nonwovens. 4. Products and applications of non-woven fabrics (1) Non-woven fabrics for medical and sanitary diapers, sanitary napkins; surgical gowns, cap covers, shoe covers, masks, face masks, hospital patients, bed sheets, mattresses, pillowcases, Anti-bacterial cord; wet towels, cotton balls, disinfection wraps; white blood cell separation materials, artificial skin; basic materials for labor protective clothing in radiation situations; medical tape base cloth, bandage base cloth, wound dressing, wound cushion, blood sucking cloth . (2) Non-woven carpets and floor coverings for household decoration; 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; winter warmth-keeping flakes; outerwear and underwear; clothing accessories (clothing labels, laces, bras, shoulder pads, etc.). (4) Shoes and imitation leather non-woven fabrics, artificial suede; inner linings of shoes, leather bags and suitcases; intermediate linings and supporting (reinforcement) materials. (5) Filter materials: Conventional filter materials: used for air conditioners, kitchen smoke filters, beverage liquid filtration, etc.; high temperature resistant and corrosion resistant filter materials: used for filtering high temperature and corrosive exhaust gas and dust discharged from industrial furnaces and kilns. (6) Geotextile geotextile infiltration trench for underground drainage and irrigation; geotextile for separation and reinforcement of drainage in highway and railway construction; geotextile for bank slope and dam reinforcement; geotextile for bridge engineering; waste storage pond; impermeable geotextile for artificial pool ; Waterproof asphalt bottom cloth. (7) Automotive industry seat covers, sun visors, soft door cushions, car roof and luggage compartment cushions and covering materials, heat and sound insulation materials, vaporizers, air filters, tufted carpet base fabrics; needled loops Molded carpet, sofa cushion material. (8) Non-woven fabrics for industrial use. Oil-absorbing materials for port sea deoiling and oil recovery in offshore oil production areas; electrical insulation materials; battery separator cloth; industrial polishing materials; glass fiber reinforced plastic substrates, industrial tape substrates, industrial hoses Substrate. (9) Agricultural non-woven cloth, household harvest cloth, frost-proof cloth, insect-proof cloth, soil moisturizing cloth, seedling raising cloth, greenhouse. (10) Household products non-woven 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 disk liners; coated bottom fabrics; packaging materials; special paper (high-grade banknote printing paper, certificates, map cloth, annual calendar cloth, oil truck calligraphy cloth)