chapter 19 huec2040

chapter 19 huec2040 - chapter19 13:54 Nonwovensdefined...

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chapter 19 13:54 Nonwovens defined Fiber webs Textile structures “produced by bonding or interlocking of fibers, or both, accomplished  by mechanical, chemical, thermal, or solvent means and combinations thereof” (ASTM  1998) Classifications Durable products Multi-use, not made to be thrown away after use Blankets, interfacing, carpet backings Disposable products Made to be disposed after single/limited use  Wipes, disposable diapers, surgical gowns and caps  The global industry Fast-growing segment of textile industry Wood pulp to polymer pellets (resins) roll goods  Manufacture Two steps in manufacturing nonwovens Preparation of fiber web Bonding of fibers in web  Fiber web formation: staple fiber webs Dry forming Dry laying or carding
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Thin fiber film from card Laid down on coveyor Machine direction Air laying Open, suspended in air, collected on screen Wet forming Fiber in water, collected on screen, drained, dried Wood pulp  Direct extrusion processes Spunbonding Synthetic filament fibers Melted, extruded, cooled, entangled, heated rolls bond Polypropylene, polyester Strong, not easily torn Interlinings, furniture, bedding, dryer sheets, disposable diapers, express mail  envelopes  Tyvek (swatch 96) Melt blowing Fine filament fibers Melted, hit with hot air, entangle Not heat bonded, weaker Good filter materials
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Spun-bonded/melt-blown layered fabrics S, M-  SMS Entrapped fibers or other materials Carbon to absorb orders Fiber bonding/entangling After web formed, treatment required to bind fibers together Mechanical means Thermal means Chemical means  Mechanical bonding Needle punching, spunlacing, stitch bonding  Needle punching Bulky, soft fabric Blankets, car truck liners  (swatch 94)  spunlacing or hydroentangling jets of water hit fibers that knot/curl patterns can be created kitchen wipes  (swatch 97) stitch bonding
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fiber webs stictched to hold maliwatt fabrics malivlies fabrics kunit fabrics can be plush-like, fut-like thermal bonding thermoplastic fibers heated calender rolls  one rolled embossed  heat applied in pattern fuses in areas point bonded strength and flexibility blend with binder fibers 
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chapter 19 huec2040 - chapter19 13:54 Nonwovensdefined...

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