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Nonwoven

Presentation about 'Nonwoven'

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Nonwoven

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  1. OUR PRESENTER… prepared by : Mazadul Hasan sheshir Southeast University Department Of Textile Engineering I/A 251,252 Tejgaon Dhaka Bangladesh

  2. PRESENTATION CONTENT… •What Are Nonwoven…??? •Properties Of Nonwoven, •How They’re Made, • Details About Web formation, •Web bonding, •Finishing Treatments, •Application Of Nonwoven.

  3. WHAT ARE NONWOVEN…??? “Nonwovens are unique,high-tech,engineeringed fabrics made from fibers” Definition Of Nonwoven : “A nonwoven is a sheet of fibers, continuous filaments, or chopped yarns of any nature or origin, that have been formed into a web by any means, and bonded together by any means, with the exception of weaving or knitting”

  4. Properties Of Nonwoven  Abrasion resistant  Absorbent  Color fast  Dry cleanable  Durable  Filtration  Flame resistant  Long-lasting  Smooth  Washable  Weatherproof  Soft  Strong  Tear resistant

  5. How They’re Made The production of nonwovens can be described as taking place in three stages, although modern technology allows an overlapping of some stages, and in some cases all three stages can take place at the same. The three stages are:  Web formation  Web bonding  Finishing Treatments 

  6. Steps Of web Formation: At Four Step They are made. That’s Have been given below: Drylaid

  7. There are two methods of drylaying: (1) Carding, (2) Airlayding. Spunmelt  Spunmelt is a generic term describing the manufacturing of nonwoven webs directly from thermoplastic polymers. It encompasses 2 processes and the combination of both.  Spunlaid  Meltblown

  8. Spunlaid : In this process polymer granules are melted and molten polymer is extruded through spinnerets. The continuous filaments are cooled and deposited on to a conveyor to form a uniform web.

  9. Wetlaid: The principle of wetlayding is similar to paper manufacturing. The difference lies in the amount of synthetic fibres present in a wetlaid nonwoven. A dilute slurry of water and fibres is deposited on a moving wire screen and drained to form a web. The web is further dewatered, consolidated, by pressing between rollers, and dried.

  10. Web Bonding: There are three basic types of bonding: 1. Chemical, 2. Thermal, & 3. Mechanical. Chemical bonding (adhesion bonding): Chemical bonding mainly refers to the application of a liquid based bonding agent to the web. Three groups of materials are commonly used as binders-acrylate polymers and copolymers, styrene-butadiene copolymers and vinyl acetate ethylene copolymers. Water based binder systems are the most widely used. It can be applied uniformly by impregnating, coating or spraying or intermittently, as in print bonding.

  11. Thermal bonding: This method uses the thermoplastic properties of certain synthetic fibres to form bonds under controlled heating. There are several thermal bonding systems in use:  Calendering uses heat and high pressure applied through rollers to weld the fibre webs together at speed.  Through-air thermal bonding makes bulkier products by the overall bonding of a web containing low melting fibres.

  12. Mechanical bonding: In mechanical bonding the strengthening of the web is achieved by inter-fibre friction as a result of the physical entanglement of the fibres. There are two major types of mechanical bonding: 1. Needlepunching, & 2. Hydro-entanglement. Needlepunching can be used on most fibre types. Specially designed needles are pushed and pulled through the web to entangle the fibres. Webs of different characteristics can be needled together to produce a gradation of properties difficult to achieve by other means.

  13. FINISHING TREATMENT  There is an opportunity to meet the needs of the customer even more precisely by modifying or adding to existing properties.  Nonwovens can be made conductive, flame retardant, water repellent, porous, antistatic, breathable, absorbent and so on. Converting  The nonwoven fabric is now complete and in a roll. Converters can take it a stage nearer its final form by slitting, cutting, folding, sewing or heat sealing.  In this way, the quality, properties and size of the converted nonwoven products can be further tailored to the precise needs of the customer, and the tasks to be performed in an impressively broad range of end-uses.

  14. Application Of Nonwoven… Absorbent hygiene products: Modern disposable absorbent hygiene products have made an important contribution to the quality of life and skin health of millions of people. Such as: baby diapers, feminine hygiene products and adult incontinence products etc benefit from the softness, smoothness, leakage prevention, strength and protection provided by nonwoven fabrics.

  15. AGRICULTURE& HORTICULTURE  Nonwovens are used effectively for optimizing the productivity of crops, gardens and greenhouses.  In horticultural applications, nonwovens protect the plants against temperature extremes by day and by night, thus creating the foundation for earlier harvests with excellent results.

  16. FILTRATION  One of the fastest growing segments in the nonwovens industry, filtration is characterized by dozens of end use areas and applications.  Nonwovens can be engineered very precisely to meet exacting specifications and stringent regulatory requirements for the filtration of air, liquid, bacteria, dust, gas and a myriad of other areas.  Some examples of where nonwovens are used:  Air filtration  Liquid filtration  Automotive filtration

  17. MEDICAL: Nonwovens are extensively used in the medical field and in protection against biological agents in other sectors. For example, they can be designed to deliver critical safety properties, such as protection against infections and diseases.  Some examples of where nonwovens are used:  Surgical: disposable caps, gowns, masks, scrub suits and shoe covers  Bed linen  Lab coats  Fixation tapes  Drug delivery  Incubator mattress etc.  The advantages of using nonwovens  Protection against  dry or wet contact  air-borne particles  Custom-made for the operating theatre  strong yet light in weight  optimal fluid absorbency  exchange of air, body heat and moisture  Breathability  Abrasion resistance and lint free.

  18. PACKAGING Some examples of where nonwovens are used  Food contact packaging  Food wrap: meat, cheese and fish  Tea & coffee bags  Absorbent pads  Sacks, bags & sachets  Transportation  Envelopes  Sacks and bags  Protection  Sheets, bags, sacks, wraps for delicate products (e.g. electronic products, car bumpers, leather goods)  Bulk products The advantages of using nonwovens  Easy to recycle and compost,  Easy to convert into pads and shapes,  High tear resistance. Surabhi Premium Non Woven Rice Packaging Bag

  19. Thanks To All.. For staying with Us… Allah Hafez…

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