Meltblown process for producing non-woven fabrics with flame-retarding capability from natural cellulose
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United States of America Patent
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Jul 28, 2015
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Sep 12, 2013
app pub date -
Mar 8, 2012
filing date -
Mar 8, 2012
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Abstract
A Meltblown process for producing non-woven fabrics with flame-retarding capability from natural cellulose comprises following steps. Blend pulp and solvent of N-methylmorpholine N-oxide (NMMO) to form slurry. Evaporate water content from slurry by a Thin Film Evaporator to form dope. Extrude the dope off spinneret bank to form filament bundle via meltblown process. Coagulating regenerate, water rinse, hydro-entangled needle-punch and dry the filament bundle to form normal natural cellulose nonwoven. Soaking roll formed nonwoven by flame retardant of N-(hydroxymethyl)-3-(methoxy phosphorus acyl). Orderly dry, bake, neutralize, soaping clean, water rinse, baking dry, soaking roll, alkaline clean, water rinse, dry and coil the nonwoven to produce modified natural cellulose nonwoven of flame retarding capacity. Because of cross-linking reaction between foregoing flame retardant and natural cellulose nonwoven, the flame-retarding capability thereof meet requirements of testing standards in American ASTM D6413-1999 and ASTM D2863-1995. Moreover, the wastes thereof meet environmental protection requirements.
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