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 GENERAL PROBLEM FACED DURING DYEING & THEIR CAUSES
 
 

 PROB.NO.

 NATURE OF PROBLEM

 CAUSES

  A

 UNLEVELNESS

 DUE TO BLEACHING AND DYEING CONDITIONS

1

 ENDING PROBLEMS

i)     POOR DYES DISPERSION.

 

 

ii)    UNSUITABLE DYE COMBINATION.

 

 

iii)   WRONG DYEING METHOD.

 

 

 

2

 CLOUDY DYEING

i)     INADEQUATE PRETREATMENT (IN BLEACHING).

 

 

ii)    IRREGULAR WINDING.

 

 

iii)   WRONG LOADING OF ROBBINS (OVER LOAD -

 

 

        TIGHT WINDING).

 

 

iv)   IMPROPER LIQUOR CIRCULATION.

 

 

v)    IMPROPER LIQUOR TO MATERIAL RATIO.

 

 

vi)   FOAMING DURING DYEING.

 

 

vii)  WRONG DYEING METHOD.

 

 

 

3

 PALE AREAS

i)     IMPROPER DESIZING AND BLEACHING.

 

 

ii)    SALT DEPOSITION DURING BLEACHING.

 

 

iii)   IMBALANCE OF LOADED MATERIAL.

 

 

 

  B

 UNLEVELNESS

 DUE TO MATERIAL

4

 BARRINESS

i)     VARIATIONS IN TEMPERATURE DURING FIBRE -

 

 

        MANUFACTURING (TEXTURING).

 

 

ii)    VARIATIONS IN DENSITY OF THE MATERIAL.

  C

 UNLEVELNESS

 DUE TO OTHER REASON

5

 SKITTERNESS

i)     INADEQUATE PRETREATMENT (e.g. DESIZING).

 

 

ii)    DIFFERENT FIBRES.

 

 

iii)   POOR PENETRATION.

 

 

iv)   POOR SOLIDITY OF FIBRE BLEANDS.

 

 

v)    TENSION DURING WEAVING, KNITTING AND

 

 

        MERCERISING.

6

 LISTING

i)     DIFFERENT SETTING TEMP.

 

 

ii)    TENSION DURING WEAVING, KNITTING,

 

 

        MERCERISING AND IMPROPER ROLLED OF

 

 

        SELVEDGES.

7

 PALE AREAS AFTER DYEING

i)     DUE TO VAPOURS OF ACID, CHLORITE

 

 

        FORMALDEHYDE.

  D

 REPRODUCIBILITY

 DUE TO DYES DYEING METHOD AND FINISHING -

 

 

 PRODUCTS.

8

 VARIATION OF SHADE

i)     DYES UNSTABILITIES.

 

 

ii)    DYES SENSITIVITIES TO METAL IONS.

 

 

iii)   USE OF HARD WATER.

 

 

iv)   DIFFERENT CHEMICAL NATURE COMBINATION.

 

 

v)    DIFFERENT LIQUOR RATIO.

 

 

vi)   UNSUITABLE DYE COMBINATION.

9

 DIFFERENCE IN SHADE

i)     DIFFERENT DYE PICK-UP.

 

 (CONCENTRATION)

ii)    DIFFERENT NATURE OF DYES.

 

 

iii)    DIFFERENT DYEING PROGRAM.

 

 

iv)   DIFFERENT SATURATION POINT.

10

 PRECIPITATES IN THE DYE BATH

i)     DIFFERENT CHEMICAL NATURE.

 

 

ii)    DIFFERENT SOLUBILITY OF DYE.

 

 

iii)    STABILITY AT DIFFERENT TEMP.

  E

 FASTNESS PROPERTIES.

 

11

 POOR LIGHT FASTNESS, WET

i)     DIFFERENT SATURATION OF DYEING AND

 

 & RUB FASTNESS

       PRINTING OF DYES.

 

 

ii)    CATALYTIC FADING DUE TO UNSUITABLE DYE

 

 

       COMBINATION.

 

 

iii)    DIFFERENT CHEMICAL PROPERTIES OF DYES.

 

 

iv)    THERMO MICRATION DUE TO FINISHING.

 

 

V)     DUE TO DIFFERENT CHEMICAL NATURE OF

 

 

        FINISHING AGENT.

  F

 SPOTS / MARKS.

 DUE TO MATERIAL

 

 

 

12

 SINGEING MARKS

i)     AS A RESULT OF SINGEING BEFORE DYEING FIB-

 

 

       RES TIPS EXHIBIT HIGHER AFFINITY FOR DYES.

13

 CHANGE OF SHADE

i)     DYE IS SENSITIVE TO METAL IONS.

 

 

ii)    DIFFERENCE IN ACIDITY / ALKALINITY.

 

 

iii)   IONIC NATURE OF FINISHING CHEMICALS.

14

 SPECKS

i)     DUE TO SALT DEPOSITION.

  G

 APPERANCES OF THE GOODS                    

 DUE TO

15

 DIMENSIONAL STABILITY

i)     INADEQUATE SETTING OF FIBRE.

 

 (SHRINKAGE)

ii)    LENGTHWISE DISTORTION DURING

 

 

       MERCERISING AND DYEING.

 

 

iii)   RELAXATION DURING BLEACHING

16

 CREASING

i)     DURING SCOURING AND HEAT SETTING.

 

 

ii)    DUE TO TIGHT WOVEN FABRIC.

 

 

iii)    UNEVEN BATCHING OF FABRIC.

 

 

iv)    MECHANICAL FRICTION.

17

 MORE EFFECTS

i)     INADEQUATE SETTING AND BATCHING.

18

 PILLING (STAPLE FIBRES)

i)     INCONSISTENT DIMENSIONAL STABILITY DUE

  H

 OTHER PROBLEMS

 

19

 DARK OR PALE SELVEDGES

i)     ONE SIDED LIQUOR FEED.

 

 

ii)    ALKALI RESIDUES IN THE GOODS.

 

 

iii)    UNEVEN TEMPERATURE IN MACHINE.

 

 

 

20

 SPOTS

i)     DUE TO CONDENSATION DROPS.

 

 

ii)    FOAM SPOTSDUE TO PADDING.

 

 

iii)   ALKALI RESIDUES IN THE GOODS.

 

 

 

21

 ENDING

i)     DYE SUBSTANTIVITY.

 

 

ii)    DYE SEDIMENTATION.

 

 

iii)   POOR PENETRATION.

 

 

iv)   MIGRATION.

 
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