dyeingworld

Nike backs waterless dyeing | Dyes & Chemicals News

2012-02-09T12:10:00.000+05:30

Nike backs waterless dyeing | Dyes & Chemicals News

a bug is the biggest lie we know!

2010-02-08T10:49:00.002+05:30

a bug is the biggest lie we know!

The Bug

2010-02-08T10:46:00.002+05:30

a bug is the biggest lie we know!

Color Communication in Textile Industry

2009-11-20T15:19:00.003+05:30

Color Communication
What is color communication?
Color communication is process by which we can express a given color accurately , describe that color to another person , and that person reproduce the same color as we perceived.
A variety of conditions affect, how a color looks, such as,
a. light source differences
b. observer differences
c. size differences
d. background and surrounding difference
e. directional differences.
Color communication in textile industry
The color communication in textile industry is very important since each individual has a like or dislike for a particular color, a lot of time is wasted between receiving swatches and developing the same color in dyeing. This not only leads unnecessary delays , but also leads to a wrong shade produced, thus wastage of expensive resources.
Since our color viewing and perceiving is purely subjective , which is affected by the factors described above , therefore same color may appear different in different conditions. So the verbal expression of colors is neither possible and nor accurate enough , then how should colors be expressed and communicated to precisely and accurately to avoid the possibility of misunderstanding and to reproduce the same color ,without affected by the time ,lighting conditions , viewer and surroundings.

What should be the method for expressing and communicating the color accurately and precisely?
To express the color precisely and accurately , the color must be expressed in such a way that a value is allotted to each color and that must be followed by every body., for this a color must be defined numerically.
A color can be expressed by hue, lightness and saturation. For example
Hue:- red, yellow , green , blue, orange, purple etc.
Lightness:-dark colors , light colors etc.
Saturation :- bright colors , vivid colors , dull colors etc.
By using the above three co-ordinates any color can be expressed precisely and numerically by assigning certain values to all these three variables. So a color can be measured , expressed , communicated and reproduced by this system.
There are different system in use to express the color,
1.Munsell system
2. CIE system
3.LCh color space
4.Huntelab color space
Go to Top
Instruments for measuring the colors
Two types of instruments are generally used to measure and express the color,
1.Colorimeters
Colorimeters express the colors numerically according to international standards and because the color measurement made by colorimeter are done by using the same light source, is unaffected by the surroundings , therefore the measurements are fast, accurate and simple. The colorimeters can be used to find out the color difference between the two colored objects.
2.Spectrophotometers
For more accurate and highly précised color measurements , spectrophotometers are used. The spectrophotometers are more versatile , suitable for complex color analysis such as metamerism and strength comparison.
Therefore the best method for communicating color is employing the use of a spectrophotometer. To reproduce the same color at a remote place , inter instrument calibration is necessary, so that a color can be measured , communicated, reproduced and controlled under the same circumstances at all places.

Further readings
Colorimeters
Spectrophotometers
Communicating the right color
Light sources

Space dyeing Techniques

2009-11-19T16:54:00.002+05:30

Space dye refers to yarn with multiple colors printed on each strand which may or may not repeat after a fixed interval. The space dyed are used to produce beautiful effects after knitting, weaving ,decorative stitching or embroidery. The colored band pattern and their length depends upon the desired effect.

There are five basic processes used to create this effect:
Space dyeing in package form
Various package dyeing machines , with a single package dyeing capacity are available in which we can dye up to 8 colors , each color is having a different feed tank as well as injector pump . The color is injected at a fixed place at high pressure and collected through vacuum .
This type of machine is used to create beautiful patterns of dyed patches on packages , with good sharpness .The dyed time is extremely low . The packages are taken for further color fixation and washing in another set of machines such as autoclave and yarn dyeing machines.

Space dyeing in hank form
This is a simpler process to produce tie die effects in the knitting yarns and embroidery threads.
The process which can be employed are,
a. By spraying the colors on a layer of hanks at fixed places , which is forced through hanks with pressure and collected underneath by vacuum. The yarns are the dried , and cured for color fixation and the washed.
b. The roller dyeing machines can be used very effectively for space dyeing with vat and naphthol colors. Even reactive dyeing is also possible with a slight modification of machine for mercerized cotton as well as rayon.
c. Package dyeing machine with fiber carriers can be used for space dyeing in polyester hanks , but the method involves a higher labor cost. But desired effects can be obtained with this method.

The yarn printing process or The warp system

In the warp system, multiple strands of yarn are continuously printed at spaced intervals with different colors. These yarns usually have “long” spaces of each color. Typical color lengths are 3”–7” .

The knit-de-knit process
In the knit-de-knit process, the yarn is first knitted into a tubular fabric (sock), dyed to a solid color and then overprinted with up to seven different colors. The socks are then de knitted , producing contrast effect of overprinted and base colors , because the overprinted colors do no penetrate at the yarn crossing points. These yarns usually have “short” (1/8”–1/4”) spaces of color.

The continuous dye process.

In the continuous dye process, yarn is dyed as singles or plied yarn and color is applied either by air jet or dye troughs. This process allows for yarns to have either long or short spaces of color

2009-11-13T13:30:00.005+05:30