Dye

Dye- Fibres

 interaction bonds: For
dye-fibre interaction it is needed that dye has to be substantive (attraction)
to the fibre to be dyed.  This
affinity will enable the dye to be absorbed by the fibre. There
are quite a few factors that affect the substant...

 Semi continuous
process:

 Pad-Batch dyeing is
one of the best example of semi continuous process. Pad-batch dyeing is a cold
method used for dyeing cellulosics (mainly 100-percent cotton and
polyester/cotton blends) material. With this process one
can achiev...

 Continuous process of
dyeing:

 When there is a need
of high production of one shade of fabric especially for uniform cloth for
military, paramilitary, school etc, continuous dyeing process is very useful. In
the continuous dyeing, fabric is dyed in open widt..

 Methods of dyeing Dyeing

 can be carried out using any one of the following ways: Batch-wise
dyeing process Semi
continuous process Continuous
process Batch wise Dyeing: Batch
wise dyeing is oldest process of dyeing. It is still very popular as it can be
rel...

 Information

 on colouring materials Dye
manufacturers provide dyers with detailed descriptions of their dyes, regarding
their application and behaviour in normal use, in the so called “Color Card or
Shade Card”.  The
most comprehensive reference on dyes and .

 Classification

 of Dyes Before
understanding classification of dyes, we must know the difference in between
dyestuff and pigment. Beside this why we do dyeing and characteristic of dyes
should also be understood well. Let us discuss these points first. Dyest...

 How to test desized material (Starch based size): To test the presense of sizing material i.e starch based sizing material in the fabric iodine test is conducted. In which the fabric is spotted or treated with   Iodine solution —Iodine  dissolved in an aque...

    

High Pressure Kier with multitubular heater: The modern high pressure kier with multitubular heater is also known as  Walsh's kier and one of the best kier. The 2 ton capacity kier is most common which is about 9 ft high and 6.5 ft in diameter and mounted o...

 Souring:

 The fabric after bleaching contains metallic salts such as calcium carbonate, magnesium carbonate etc., and other mineral matter. These salts, if left on the fabric, will not only give a harsh feel but also affect the uniformity of the shade during...

Souring process used to remove calcium and magnesium impurities presnet in the fabric, come after processing with hard water. In this process fabric is treated dilute acid like hydrochloric acid, which dissolve calcium and magnesium salts and thus make fabric soft. While in the case of antichlore, the main aim is to remove presnet of cholorin from the fabric after bleaching fabric using chlorine based bleaching agents like sodium hypochlorite.

 Human Visual System   Retina uses special cells called “rods” and “cones”.   Rods “sees” in black, white & shades of grey and tell us the form or
shape(Super-sensitive allowing us to see when it's very dark). Cones “senses” colour but need more light. Three...

Measurement of colour: Following methods are used: i) Munsell Scale ii)   CIE colour system Munsell Scale: In 1905, artist
Albert H. Munsell originated a color ordering system — or color scale — which
is still used today. The Munsell System of Color Notatio...Heat setting of polyester: Heat-setting
is a heat treatment by which shape retention, crease resistance, resilience and
elasticity are imparted to the fibres. It also brings changes in strength,
stretchability,  softness,
dyeability and sometimes on the co...Bleaching of yarn using cabinet and cheese/package processing machine: Bleaching of cotton yarn can be carried out using cabinet or cheese/package processing machine. In the cheese/package processing machine, the yarn are wound onto perforated stainless-ste...Bleaching in Jet and Soft flow dyeing machine: In a jet dyeing machine, a very efficient
contact between the liquor and the fabric is established since both are in
constant movement. This improved effective treatment and also reduce the
treatment time. Jet ...