Thursday, 5 March 2015

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At first, the types of coloring methods are explained.

Following 4 types of coloring methods are used for plastics. Coloring in black is usually done by means of either a masterbatch or a compounding method, while plastic materials of other colors are mainly made by means of a surface-coating method where color matching is relatively easy.
 
1) Master Batch Method for Colouring or Pigmentation:
 
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This is a coloring method in which plastic material to be colored is mixed with so-called "masterbatch" which is the colored material of a high pigment content. Masterbatches can be handled easily, and the depth of color can also be easily controlled by the amount of masterbatches to be added. They are often used for coloring in black or gray. Depending on the kinds of pigments, however, it is sometimes difficult to make masterbatches, or to match up to the colors wanted by customers.


 
2) Compounding Method for Colouring or Pigmentation:
 
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This is a method to make colored pellets by means of mixing pigment with the pellets of natural color and then extruding the mixture. The highest consistency in color is the most important advantage of this method. However, this is usually the most expensive coloring method, since it is inevitably accompanied by extrusion process.
 
 
 
3) Surface Coating Method for Colouring or Pigmentation:

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In this method, organic solvent in which pigment is dispersed is sprayed on the surfaces of natural pellets to be colored to form colored coating. Since colored pellets can be easily available by this method, this method is very popular among customers, and used most widely particularly for colorful moldings. Handling is also easy, but the dispersion of pigment by this method is slightly inferior to that by compounding method.
 
 
 
 
 4) Dry Blending Method for Colouring or Pigmentation:

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This is a method to just mix pellets and pigment prior to molding. The handling is not so easy and the cleaning after the molding is also troublesome. The dispersion of pigment is poor, and the consistency of color is not good either. Although this method is applicable if only pigment is available, actually this method is not used so often because of the reasons mentioned above.
 
Reference:
 
 
 
 
 
 


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Qualitron Chemicals
Manufacturer of Pigments in Gujarat - India

 
 
 
 
 
 
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