Mixing: High-Shear Mixers for Viscous Applications
Hybrid mixer has stirrer, disperse blades.
Responding to the need for high shear in formulations too viscous for conventional dual-shaft mixers, the Ross PowerMix from Charles Ross & Son Co. is a hybrid planetary mixer equipped with the patented high viscosity “HV” stirrer blade providing axial product movement and radial exposure to a high-speed disperse blade, which in turn breaks down agglomerates and promotes rapid solids wet-out. Both the stirrer blade and saw-tooth disperser revolve around the batch while rotating on individual axes at independent speeds.
The PowerMix is available across a full range of working capacities from 1 qt to 1000 gal.
Coloring at the machine can offer significant cost benefits, including lower material inventory costs and improved process flexibility when compared with the cost of buying precolored resin or installing a large-capacity central blender to premix resin and color concentrate.
The dilemma for compounders with starve-fed twin-screw extruders is how to keep the formulation constant within the extruder barrel.
Accuracy is one of the least understood aspects of blending. The differences between batch and continuous blenders, how blend accuracy is calculated and controlled, which blender type is more accurate, how much accuracy is really required, and how payback is calculated are discussed here.