Microdenier PET fabric, which has a denier of less than 0.5, provides better feel, comfort, drape, and breathability compared to normal PET, which has a denier of 2.0. Dyeing microdenier PET requires more careful control due to its difficulty in achieving dark shades and maintaining good fastness properties. The dyeing of PET depends on factors like pH, temperature, time, filament denier, and the presence of carriers and levelling agents in the dyebath. Microdenier PET has a higher rate of dyeing but requires about 20% more dye to achieve the same depth of shade as normal PET. It provides a lighter handfeel and inferior wash, sub

1. Presented by
Anilkumar L. Yadav
Sk Md Zulfikar

2.  Microdenier Vs Normal PET
 Microdenier< 0.5D , Normal PET-2.0D
 Better Feel, Comfort, Drape, Breathability
 Limitations of Microdenier -
 Difficulty in case of Dark shades
 Require higher control during dyeing
 Poor fastness properties

3.  Water insoluble
 Non ionic nature of disperse dye
 Absence of functional groups
 Only Disperse Dyeability
 Solid solution dyeing mechanism

4.  pH
 Temperature
 Time
 Filament Denier
 Presence of carrier in dyebath
 Molecular weight & shape of disperse dye

5. Type Mol. Wt. Diffusion
coefficient
Sublimation
fastness
Levelling
property
High Energy (E) 500 -600 Poor High High
Medium Energy
(SE)
300 -500 Moderate Medium Medium
Low Energy (S) 200-300 High Least Less

7.  K/S....
 Indication of surface colour only
 Difference in % shade
 K/S = (1- R)2 / 2R
Where,
K-coefficient of absorption
S- coefficient of scattering
R- % reflectance
 K/SND>K/SMD
Note-
ND-normal denier MD- micro denier

8.  Measured in terms of gm of dye per kg of dyed
fabric
 Need of measurement of Absolute dye uptake
 Method of measurement - optical density
method

10. Characteristic Microdenier PET Normal PET
Rate of Dyeing Higher Lower
Absolute Dye uptake Equal Equal
K/s Low High
Depth of shade Dark shade is not
possible
All shades are
possible
Amount of dye for
same shade
Required 20% more dye
for the same depth
Levelling Agent essential optional

11. Characteristic Microdenier PET Normal PET
Light Low High
Wash Inferior Better
Sublimation 1-2 degree less Better
Wet rubbing Inferior Better

12.  Microdenier PET have better aesthetic
properties & require judicious control during
its dyeing
 Disperse dye itself is one of the factor which
affects the dyeing of PET

13. Thank You