contact for fd&c red 40 fd&c red 40 by Standardcon

Dyeing Process basically discusses what you do with the dyes. There are today available latest and state-of-the-art dyeing methods that effectively colour the various substrates. This is a very critical operation carried out in the Dye houses in a series of steps. The pages here gives precious information regarding the various dyeing processes in different industries.
Dyeing Process » Pigment Dyeing
Batch Dyeing Process Continuous Dyeing Process Semi-continuous Dyeing Process Pigment Dyeing Process

What is a Binder?

Binder is the material that holds the pigment together and gives a finish that sticks well to the surface.
Pigment dyeing is a comparatively recent addition. In the process of pigment dyeing no actual chemical reaction takes place between the dye and the fabric. Instead, what happens is that the pigments gets seated on the fabric with the help of binders. There is a challenge in pigment dyeing. Pigments are not soluble in water and shows no affinity for fiber. So, conventional dyestuff-based dyeing conditions are not feasible for pigment dyeing. To come to terms with such limitations, a new kind of pigments have been formulated for use in fibers. These are maintained in a stable dispersion in the medium of water by anionic surfactants. This type of pigment is known as pigment resin color (PRC), primarily used in printing. Some of the popular pigments used in fabrics are given here.
  • Yellow colour: Acetoacetic acid anilide pigments
  • Red: Azoic pigments
  • Blue or green: Phthalocyanine pigments
Difference between a dye and Pigment in context fiber dyeing is explained in the following section.

Pigments Dyes
Pigment coloring is done by dispersion of fine particles. These are in sizes smaller than 1 micron. They contain around 108 mol of molecules per particle. They get attached to the fibers in this original state. In contrast, dyestuffs tend to fix on fiber with individual molecule (in some cases, however with several molecules)

Key features of a good pigment dyeing system

A good pigment dyeing system should ideally come with the follow innovative features.
  • Doing without wet processing: results in Preventing water pollution along with high Productivity.
  • Binder: For improving crock fastness
  • No thermo-migration : This makes even dyeing on both the sides
  • Excellent Fastness properties

A Conventional Pigment Dyeing system

A typical process of pigment dyeing for cellulosic textile materials consists of padding the textile materials with a Dye bath. The dye bath contains anionic or neutral colour dispersions of pigments. Along with the pigments it also contains anionic binders, acid-liberating catalyst, anti-migrating agents, and other types of additives. Then the textile materials are dried at high tempratures, this cures the film-forming binders and pigment colours firmly on the textiles.


Google

Flag Counter