This is the technique of applying dye stuff suspended in liquid that is formed with a special mixer and applied to the fabric is a relatively recent development.
It is still undergoing refinement in the technology.
The prime motivation for this method of dyeing is the desire to conserve energy in dyeing and steaming.
Other considerations are to reduce water consumption and pollution.
This method is based up on the fact that the foam which has the high volume and high viscosity makes it possible to apply relatively small quantities of concentrated dye liquid as compared to pad dyeing.
Foam dyeing is done essentially by feeding with the aid of trough and a doctor blade.
A uniform layer of foam of exactly defined thickness on an applicator roll. The foam is pressed in to the fabric as it comes in contact with the roll for about 180 degrees.
The front and back of the fabric can be simultaneously dyed in one pass.
Heavy pile fabrics and carpets can also be foam dyed.
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