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Composition optimization of extruded starch foams using response surface methodology
Author(s) -
Lui WaiBun,
Peng Jinchyau
Publication year - 2004
Publication title -
packaging technology and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 50
eISSN - 1099-1522
pISSN - 0894-3214
DOI - 10.1002/pts.665
Subject(s) - cushioning , die swell , polyvinyl alcohol , response surface methodology , calcium carbonate , materials science , compressibility , central composite design , composite material , composite number , starch , extrusion , chemistry , chromatography , food science , engineering , aerospace engineering
Response surface methodology (RSM) was used to analyse the effect of polyvinyl alcohol (PVA) and calcium carbonate (CaCO 3 ) on the objective attributes (shipping bulk density, radial expansion ratio, compressibility and spring index) of a biodegradable cushioning extrudate. A rotatable central composite design (CCD) was used to develop models for the objective responses. The experiments were run at 105°C with a feed rate of 27.8 l/h, screw speed 500 r.p.m. and die diameter 3.92 mm. Responses were most affected by changes in polyvinyl alcohol (PVA) levels and to a lesser extent by calcium carbonate (CaCO 3 ) levels. Individual contour plots of the different responses were overlaid, and regions meeting the optimum shipping bulk density of 6.00 kg/m 3 , radial expansion ratio of 3.30, compressibility of 43.71 N, and spring index of 0.91 were identified at the PVA level of 20.23% and the CaCO 3 level of 7.89%, respectively. Copyright © 2004 John Wiley & Sons, Ltd.