wet processing lecture no.1
TRANSCRIPT
8/7/2019 Wet Processing Lecture No.1
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Introduction to textile engineering
Wet processing
8/7/2019 Wet Processing Lecture No.1
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Introduction
Fabrics str aight off the loom or knitting
machines are called GREIGE FABRICS These do not appeal to the consumer for a
number of reasons
Fabrics often look unattr active because of
lack of color
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Yarns in greige f abrics may have size
applied for weaving or lubricating oil appliedfor knitting
These additives, if not removed, make the
f abric feel stiff and unpleasant in handle
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Fibers and yarns are stretched during yarn
and f abric manuf acturing, and the residualstress in the fiber and yarn will lead to
dimensional stability (e.g. shrinkage)
Any stains and natur al color on the greige
f abric should also be removed before theapplication of color to the f abrics
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There are many aesthetic and functional
requirements that greige f abrics have tosatisf y for different end-use applications
Most textile f abrics require pre-treatment
before they can be dyed and finished
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After the color application, the f abric is
always distorted and further finishingtreatment is required to rectif y this problem
and to further enhance the functionality of the
f abric
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Fabrics made from different fiber types are
often finished differently
FOR THESE RE ASONS, TEXTILES ARE ALMOST ALW AYS DYED AND FINISHED
BEFORE USE
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Wet processing can be described as
the treatment of GREIGE CLOTH withdifferent chemicals to prepare it for color
application
Application of color onto the f abric via dyeing
or printing
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Application of different types of finish onto
the f abric as required Treating the textile effluent gener ated by the
wet processing
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Departments in wet processing
Pre-treatment
Color kitchen Dyeing and printing
Finishing
Testing Labor ator y
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Processes involved in wet processing
Pre-treatment
Inspection and marking Shearing
Singeing
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Desizing
Mercerizing Bleaching
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Color kitchen
Distribution of dyes, pigments and differentchemicals according to their need
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Dyeing and printing
Application of color onto the f abric in case of dyeing, either by exhaust method
or continuous method
In case of printing, then by different types of
printing techniques available like screen
printing, discharge printing e.t.c.
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Finishing
Application of different types of finishes ontothe f abric according to the customer
requirements
some of the common finishes are increasing
the handle, improve the lusture, iron free
finish, moth repellent e.t.c.
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Testing laborator y
Performing lab scale experiments for pre-treatment processes
Dyeing and printing
Finishing
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Performing different tests on the f abric, yarn
and fiber to check different dyeing, printingand finishing properties
Perform the color matching tests
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Color has been playing a dominant role in
the life of man from a long time Indigo of ancient India has been in use in the
textile industr y for the last sever al thousand
years.