Knit dyeing faults and it’s remedies

Welcome to The Presentation
ON
Knit Dyeing Faults and It’s Remedies
Submitted To
Rajib Saha
Assistant Professor
Department of Textile Engineering
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

Dyeing is a process of treating fabrics with dye liquors which contains both dyestuffs and
chemicals and fixing the dyes in the fabric subsequently.

In discussing faults which can be attributed to dyer and finisher, it is necessary first to
have a general conception of some of the major operations to which goods are subjected
after they are received by the finisher of wet processing .


To know about the different types of wet processing faults.

To know about the causes of different types of wet processing faults.


To know about the remedies of different types of wet processing faults.

To know about the pre-treatment process of textile goods.

To know about the wet process of textile goods.

To know about the finishing process of textile goods.

To know about the different types of wet processing machineries.

To know about the job sequence of wet processing industry.


Some Faults
in
Knit Dyeing Processing

Faults Name Faults Sample


Incomplete Scouring
Causes Remedy
  !
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Faults Name Faults Sample

Low degree of whiteness
 Causes Remedy
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Faults Name Faults Sample

E#ect of H2O2 residues
Causes Remedy
 '((!
 '((

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
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 '((!
 '((

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
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Faults Name Faults Sample

E#ect of Hairiness

Causes Remedy
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 !
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 +,!(0!$
Faults Name Faults Sample

Barrie
Causes Remedy

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 4"3

 5
 !36

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 +
 +!36
 -"
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Faults Name Faults Sample


Shade bar
Causes Remedy
 !3
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 +$
Faults Name Faults Sample

Uneven dyeing
Causes Remedy
 7!89:$
 !
 736$
 713$
 !#$
 4!
 413$
 +!$
 +!#$
Faults Name Faults Sample

Line mark
Causes Remedy
 !;
 
 %6
 +
 %6
 

Faults Name Faults Sample

Batch to Batch
Shade variation
Causes Remedy
 !$
 !!!$
 4
!$
 $
 7!$
 <!&$
 !$
 <!$
 !
$
8.* 8.*$*

Dye spot
Causes Remedy

!$

!$

4!$

4"3
!=1
!$

Causes Remedy
 +$
 -!
 !&$
 !#$
 <!$
 !$
 *!#$
 '&$
Faults Name Faults Sample

Crease mark
Faults Name Faults Sample

Roll to roll variation or
meter to meter variation
Causes  Remedy
 +!$
 !$
 '$
 !#=$
 7!$
 +!#$
 7$
Faults Name Faults Sample

Thick –thin yarn
Causes Remedy
 #!$
 7!!3$

 73$
 >!!
!6#$
Faults Name Faults Sample

O# shade
Causes Remedy
 6
!
!$

!
!
$
 +$
 $
Faults Name Faults Sample

Insufficient hydrophilic
Causes  Remedy

Insufficient removal of grease, wax and sizing film which
gives hydrophobic characteristics to the fabric. When a
fabric with un uniform hydrophilic is dyed, areas with
different lower / hydrophilic results in a lighter shade are
obtained due to the lack of absorption of the dye liquor.

To avoid this a thorough pre-treatment is a must,

Wetting agent can be used in dyeing liquor.

Faults Name Faults Sample

 Bowing
Causes Remedy
 .3
?
$
 %$

$

7!&$
 %&&$
 +!$
Faults Name Faults Sample

Compacting crease
Causes Remedy
 %6;$
 $
 7!$
 <!!&;$
 %6$
 %6!$
Faults Name Faults Sample

Water spot
Causes  Remedy

Fixation with a few drop of water on specific area of dyed

fabric

Proper fixation
Faults Name Faults Sample

Poor washing fastness
Causes Remedy
 &,$
 &!$
 $
 !!"$
 736!
!$