WHY GO Liquid Type Pigment?
No matter which type of production method is used to make them, liquid color concentrates offer several advantages over other coloring options. Because of the physical properties of a liquid, it can be metered much more accurately than a pelletized or powdered mixture. This advantage means that liquid colorants can be dosed very effectively and consistently, which provides excellent color consistency in the end product. The liquid also lends itself to dispersion within the base polymer more effectively than other forms of color. This enables a processor to achieve excellent color dispersion throughout their finished product.
The ability to more highly load liquid concentrates with color than their solid counterparts means that less colorant can be used to achieve comparable results. This translates into higher letdown ratios for a given application and can provide a processor with great efficiencies in the coloring operation.
Also, the fact that liquid does not require melting prior to mixing with the resin is especially advantageous when working with heat-sensitive materials.
But not all is rosy with using liquid color concentrates. There are some real issues to consider before using them in your operation. In some applications, for example, the liquid carrier may bloom to the surface if not completely compatible with the base resin. Also, in certain high-speed processes, a phenomenon known as screw slippage may be exhibited. This can become especially significant in applications using the liquid at letdown ratios in excess of 2%.
Inventory management and quality control also become paramount for using liquid color effectively. As mentioned earlier, the potential exists for the pigments to fall out of suspension. This can lead to inconsistent coloring, and sometimes aged liquid concentrate needs to be scrapped. It is critical to work with your supplier to understand the colorant’s shelf life and develop procedures like rotating your stock and using a First-In/First-Out inventory strategy to ensure that liquid colorants are being used efficiently and properly mixed prior to use.
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