Pigment Printing

Printing are insoluble coloring matter mostly mineral origin have been used for the coloration of metal, stone, wood and textile material.
Basic Principle of Pigment Printing:
  1. Pre-treatments.
  2. Printing.
  3. Dyeing (90-100ºC).
  4. Curing (Cotton 140-160ºC; 3-5min and polyester 160-220ºC; 30-60sec).
Successful pigment printing systems are based on three equally important components such as:
  1. Pigment dispersion.
  2. Binder and cross-linking agents.
  3. Thickeners and auxiliary agent giving the required rheology.
pigment-printing
Pigment dispersion: Most of the pigments used in textile printing are synthetic organic materials except for carbon black, TiO2 and white pigments, copper and aluminum alloy. When choosing synthetic pigments the principle brilliance and the coloring power of the pigments should be3 taken into consideration. Organic pigments must used:
  1. Azo pigments (Yellow, Orange, and Red).
  2. Halogenated copper (Blues, greens).
Binder system: The binder is a film forming substance made up of long-chain polymers which when applied to the textile material together with the pigments, produces a three dimensional linked network. The network is formed by curing, which usually consists of dry heat and a pH value of around 5, bringing about self cross-linking or reaction with suitable cross-linking agent. Elasticity and improved adhesion of the film to the fabric is achieved cross-linking.
Advantage of pigment printing:
  1. Applicable to natural and synthetic fiber.
  2. Easy applicable and less expensive.
  3. No need of washing.
Disadvantage of pigment printing:
  1. Wet and rubbing fastness is average.
  2. Not controllable for the binder film.
  3. Less abrasion.
  4. Less comfort resistance.

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