This Assignment deliver to Shariful Islam Sir dept. of BSTE, City University

1. An Assignment
On
“Role of computer color matching system in textile industry”
Course Title: Application of computer in textile.
Corse Code: CSE 415
Submitted To:
Shariful Islam
Lecturer
Department of Textile Engineering
City University
Submitted by:
Md. Zahid Hasan
ID: 173375179
Batch: 37th
Program: BSTE
Submission Date: 30th
April, 2021

2. Introduction
Color matching and color control have becomean integral
part of dyeing industry. Computer Color Matching System
is developing by different manufacturers. Among all of
them DATA COLOR is bestin this regard. Computer Color
Matching System(CCMS) predict very close recipe for any
shade with advanced spectrophotometerand color software.
History of CCMS
• First in 1963, ICI, Dyestuff
• Division established the Computer System for
color match prediction in their lab, but it was for
their customer only.
• Later in 1973, ICS (international colour
system), manufactured computer matching
system commercially.
What Is Color And Color Matching?
• Color has a degree of lightness or value
• Hue is the actual color
• Color has some saturation- The amount of
color present
• Color matching for fabric is the technique of
identifying the dye
• Combinations present in the fabric and
replicating.

3. How Computer Color Matching Is
Done?
A color match predictability system has the
following:
• A predictability guide
• A spectrophotometer,
• And a computer with input and output
devices.
A light is directed at the color sample and then passed into the spectrophotometer
where its color spectrum is analyzed, converted into data, and fed to the computer.
The quality of the color match for the various formulations is analyzed to
determine the formulation having the bestpossible color match. The modified
sample having the bestcolor match may be viewed by the user to predict the color
of the final product.
Different Parts of CCMS
1. Computer: Computer is needed
for CCMS. In this system special
software is installed in the
computer before run the CCMS.
Spectrophotometerand printer is
joined with the computer. When
spectrophotometer analyzes the color the results show in the monitor and if
needed results could be print out by the printer. All the information is send
from the hard disk of the computer.
2. Spectrophotometer:Spectrophotometeris the main instrument of CCMS.
Spectrophotometerhas a sample holder in the middle of the front side. The
sample holds on there. Then it takes the reflection of the light and analyzes
the depth of the color and shows the results on the computer monitor. It also
makes decision about the fastness properties of the sample.
3. Printer: Printer is joined with the computer for printing the results.

4. Functions of Computer Color Matching System
The following can be done by using CCMS -
• Color match prediction.
• Color difference calculation.
• Pass/Fail option.
• Color –fastness rating.
• CostComparison.
• Strength evaluation of dyes.
• Whiteness indices.
• Reflectance curve and K/S curve.
• Production of Shade library Etc.
Advantages of CCMS
• Customers get the exact shade wanted with his knowledge of degree of
metamerism.
• Customers often have a choice of 10-20 formulation that will match color. By
taking costing, availability of dyes, and auxiliaries into account, one can choosea
best swatch.
• 3 to 300 times faster than manual color matching.
• Limited range of stockcolor needed.
Limitations of CCMS
• Calibration Samples: The dyeing conditions in the laboratory & productions
differ in various respects viz, M: L ratio, auxiliaries dyeing machines, exhaustion
of dye etc.
• Change of Substrate: It is very difficult to maintain the characteristic properties
of the substrate as regards the quality of the fibers, yarn structure, fabric
construction, color, heat setting, pretreatments, etc. which in turn changes the dye
uptake properties of the fiber. It is particularly impossible to prepare the basic
calibration data under all such variation.
• Change in Dyestuff: Every incoming batch of the dye stuff requires testing for
tonal & strength changes which needs recalculation of the recipe. Recipe suggested

5. by the computer are based on minimum color difference within given tolerance &
least metamerism in CIELAB scales. But always CIELAB tolerances do not
confirms exactly with human perceived color difference. Light sources used to test
the match, are CIE standardized simulated standard illuminant, which are not same
in all respectwith natural sunlight. Instrumental accuracy may be checked
periodically. The kubelka-munk equation & optical theory of computer colour
matching do not apply strictly on extra glossy or fluorescent samples.
Other Application of CCMS In Dye House
• Forquality controlof dyed textiles.
• ForEvaluation of Quality of dyes supplied.
• Role of dyeing additives by measuring colour yield.
• Efficiency of optical brighteners by UV analysis.
• Soil removal efficiency of surfactants by measuring Reflectance value.
• Measurement of whiteness/yellowness/brightness index etc.
Conclusion
At the end, it may be said that after necessary training and guidance, this
Instrument of CCM system can be used successfully for its versatile use including
Computer Aided Color measuring and Matching purposewhich needs to be
implemented in all dye houses of either all textile dyeing or jute dyeing to derive
the above said benefits of precessionmatching and customer satisfaction.