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Compounding Compounding involves an additional process where just enough colourant is compounded to a polymer base to achieve the desired colour and opacity. The resultant colour compound is ready for processing by injection moulding or extrusion into finished product.
There are several advantages to having a material
compounded which include:
to be confused with dispersion)
or masterbatch required)
The disadvantages of compounds are that they can work out more expensive due to the additional processing that the material undergoes and it may be necessary to increase stock holding because a quantity has to be held for each colour of the same grade.
Masterbatch
The use of masterbatch involves adding a colour concentrate to an uncoloured base polymer. This concentrate, or masterbatch, can be added in liquid or solid form from as little as 0.5% to 5% typically. As with compounded material, there are advantages and disadvantages of using this method to colour a polymer base.
Advantages include:
masterbatch should be fully dispersed at the manufacturers)
using Dry Blends***
the masterbatch can be used across generic material types order to optimize properties a polymer specific carrier should be used.
in mind when using masterbatch can be colour consistency throughout a batch. Accurate dosing is essential to maintaining colour quality which requires modern dosing equipment and the ability to use and monitor correctly.
Generally the use of masterbatch works out cheaper than
compounding as long as it is added at the correct dosing levels.
little difference in colour between an addition rate of 1% or 2% yet the cost of colouring is doubled!
There are two other methods of colouring plastics, which are perhaps not so widespread, that are also worth mentioning:
polymer base and raw pigments together and processing without quality product of varying colour consistency with a high chance of poor dispersion and distribution.
the machine, the masterbatch is added to the polymer base and mixed manually. This method is sometimes used when there is no also be used where the sort of high addition rates are required that dosing units cannot accommodate.
information please contact to guide you in your choice of colourant or to discuss any current technical issues or projects you may have regarding the colouring of plastics - 0845 3454560 or
sales@plastribution.co.uk.
Plastribution is the UK’s leading distributor of plastics raw materials, delivering reliability, know-how and true business partnership to the world’s best polymer suppliers and our UK customers.
colouring of plastics, please do not hesitate to contact a emailing
sales@plastribution.co.uk or phone 0845 3454560
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