TY  - JOUR
T1  - The Colorimetric Measurement of Melange Woollen Yarns: A New Optical Tool
AU - , Rocco Furferi AU - , Monica Carfagni 
JO  - Journal of Engineering and Applied Sciences
VL  - 2
IS  - 5
SP  - 877
EP  - 881
PY  - 2007
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2007.877.881
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2007.877.881
KW  - Yarns
KW  -spectrophotometry
KW  -optical colorimetry
KW  -CIELAB
KW  -CIELCH
AB  - One of the most critical phases of the production of woollen yarns for knitting and weaving is the comparison between the colour of the finished product and the colour desired by a customer or provided by a catalogue. Accordingly the companies that produce yarns perform a colorimetric control of their products by evaluating the colorimetric distance between the final product, obtained by mixing the coloured raw material and the desired one. This colorimetric control is mainly performed using a calibrated reflectance spectrophotometer thus allowing an accurate measurement of the spectrum of a woollen yarn. This is performed only  in  the  case  of  uniform colour. Being the area of the spectrophotometer acquisition sensor very small (20 mm<SUP>2</SUP>) when a woollen yarn is composed by two or more colours (i.e., is a meange woollen yarn) the spectrophotometer is not able to discriminate all the colours reliably. The objective of the present research, developed by the Dipartimento di Meccanica e Tecnologie Industriali of the University of Florence in collaboration with the company Newmill S.p.A., is to develop an optical system (tool) able to perform an accurate colorimetric measurement of melange woollen yarns on the basis of the combination of flat scanner acquisition and colorimetric techniques.
ER  -