Disperse Dyes in Printing

 Methods of printing with Disperse Dyes – a practical over view

Nuchem Dyestuffs P Ltd., (NDPL), suggests the following 3 methods for printing with disperse dyes. These methods can be used in flat-bed and rotary screen printing machines.

Method-1:

PRINTING - DRYING - BAKING - REDUCTION CLEARING - WASHING OFF

1.       PRINTING

Recipe	Full Thickening	Half Thickening
Disperse Dyes	X - parts	X – parts
Alginate thickener (10% conc)	600 - parts	450 – parts
Emulsion thickener	Nil	150 – parts
Anti-Reducing Agent (mild Oxidizing agent)	5 – parts	5 - parts
Citric Acid	2 – parts	2 – parts
Wetting Agent	20 – parts	20 –parts
Add water to make	1000 parts	1000 parts

2.  DRYING – on stenter at 100 – 105°C

3.  BAKING – on Curing machine

-    Temperature                210 ⁰C

-    Time                              60           second

4.  REDUCTION CLEARING (RC)

-          NaOH flake                                  2              gram / litre

-          Sodium hydrosulphite                 2              gram / litre

-          Dispersing agent                         2              gram / litre

-          Temperature                               60 ⁰C

-          Time                                            10 minutes

5.  WASHING OFF

Method-2:

PRINTING - DRYING - HT STEAM -  REDUCTION CLEARING - WASHING OFF

1.           PRINTING

Recipe	Full Thickening	Half Thickening
Disperse Dyes	X - parts	X – parts
Alginate thickener (10% conc)	600 - parts	450 – parts
Emulsion thickener	Nil	150 – parts
Anti-Reducing Agent (mild Oxidizing agent)	5 – parts	5 - parts
Citric Acid	2 – parts	2 – parts
Wetting Agent	20 – parts	20 –parts
Add water to make	1000 parts	1000 parts

2.           DRYING

3.       HIGH TEMPERATURE (HT) STEAM

-          Temperature                170 ⁰C

-          Time                              8 minutes

4.       REDUCTION CLEARING (RC)

-          NaOH flake                                  2              gram / litre

-          Sodium hydrosulphite                 2              gram / litre

-          Dispersing agent                          2              gram / litre

-          Temperature                                 60 ⁰C

-          Time                                              10   minutes

5.       WASHING OFF

Method – 3:

PRINTING   - DRYING   - HP STEAM   -  REDUCTION CLEARING   - WASHING OFF

1.           PRINTING

Recipe	Full Thickening	Half Thickening
Disperse Dyes	X - parts	X – parts
Alginate thickener (10% conc)	500 - parts	250 – parts
Emulsion thickener	Nil	450 – parts
Anti-Reducing Agent (mild Oxidizing agent)	2.5 – parts	2.5- parts
Wetting Agent	10 – parts	Nil
Add water to make	1000 parts	1000 parts

2.       DRYING

3.       HIGH PRESSURE (HP) STEAM

-          Temperature                130 ⁰C

-          Time                              20 minutes

4.       REDUCTION CLEARING (RC)

-          NaOH flake                                  2              gram / litre

-          Sodium hydrosulphite                 2              gram / litre

-          Dispersing agent                         2              gram / litre

-          Temperature                                60 ⁰C

-          Time                                             10   minutes

5.       WASHING OFF

Notes:

1.       Disperse Dyes                 : Nusperse Dyes (Nuchem Disperse Dyes)

2.       Alginate thickener         : Manutex F  , etc

3.       Emulsion thickener        : mixture from water , white spirit and emulsifier

4.       Anti reduction                : Matexil PAL , Ludigol , sodium chlorate , etc

5.       Wetting agent for print paste           : Matexil WA-KBN , etc

6.       Dispersing agent           : Matexil DN-VL , Solopol ZB , etc