ACOUSTICAL ABSORPTIVE PROPERTIES OF MULTI-LAYERED POLYLACTIC ACID, COTTON NONWOVEN BATTS AND NEEDLE-PUNCH FABRICS.
ACOUSTICAL ABSORPTIVE PROPERTIES OF MULTI-LAYERED POLYLACTIC ACID, COTTON NONWOVEN BATTS AND NEEDLE-PUNCH FABRICS.
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Date
2012-03
Authors
OMOTUNDE, OGUNBOWALE WOSILAT
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Abstract
This study investigated the absorptive properties of non woven cotton and Poly lactic acid
materials. The non woven materials used in this study are batts and fabrics made from 100
percent cotton and 100 percent poly lactic acid fibers. These are biodegradable from natural
source and are environmentally friendly. The fibers were characterized for their properties by
subjecting them to different characterization tests. Twenty samples were produced from the
fibers using the non woven processing. Layering was achieved by tacking layers of batts in
various sequences of 100%, 75%, 50% and 25% of batts respectively to form blend ratios of
the fibers of 800g/m2 area weights (eight layers). The method used for measuring the
acoustical properties of the samples is the impedance tube method whereby; sound absorption
coefficient is determined at each of the eleven frequency range in accordance with the ASTM
1050 - 08 standards; which tested five specimens from each sample. Both fiber types
achieved good absorption, but the results obtained show that eight (8) layers cotton batts
absorbed better than cotton fabric and PLA batts and fabric, since its absorption coefficient is
closest to one. The results also show that physical parameters such as; fiber type, size,
density, cross section, are significant to level of absorption. These parameters and other
variables such as: thickness, resistance, layering order, porosity and air permeability were all
investigated and their influence on material absorption is found to be positive and significant.
This study suggests that these fibers (cotton and PLA) which are environmentally friendly
and cost effective will serve as good alternatives to petroleum based fibers which are
currently in use.
Description
A DISSERTATION SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU
BELLO UNIVERISTY ZARIA NIGERIA
IN PARTIAL FULFILLMENT FOR THE AWARD OF DOCTOR OF PHILOSOPHY
IN INDUSTRIAL DESIGN (TEXTILES)
DEPARTMENT OF INDUSTRIAL DESIGN
AHMADU BELLO UNIVERISTY, ZARIA
NIGERIA
MARCH 2012.
Keywords
ACOUSTICAL,, ABSORPTIVE,, MULTI-LAYERED,, POLYLACTIC,, ACID,, COTTON,, NONWOVEN,, BATTS,, NEEDLE-PUNCH,, FABRICS.