Powder blends, otherwise referred to as Dryblends, are concentrated formulations of pigments supplied in powder form. These can be supplied as color concentrate and/or as property additives such as processing aids, dispersion aids, or others, as required. This form offers some advantages as well as disadvantages in their use.
- Very economical
- Available in very small quantities
- Highly Universal, can be used with practically any polymers
- Difficult to use with automated blending equipment
- Difficult to clean
Generally prepared by drum tumbling with the required resin in doses, which range from .10% to 1% (1000:1 to 100:1).
The generation of dust can be greatly reduced by the following process:
After depositing the resin in a drum, but prior to adding the Dryblend pigment, add a tablespoon of clear colorless mineral oil to the resin. Mix for about five minutes until the surface of each pellet will be covered with a fine coating of oil. Then add the Dryblend and mix as usual. The oil coating will greatly improve the adherence of the Dryblend to the resin significantly reducing the dust generation.
- Bulk packaged, in drums or pails
- Unitized prepacks, small bags packaged with the exact quantity of Dryblend required to blend for a specific project.
- Polyethylene-Polypropylene-Polystyrene-ABS-ASA-AES-TPO-TPR-PVC-NYLON-ACETEL-POLYCARBONATE-And others