A new batch gravimetric blender reportedly stops the frequent problem of leaking pellets all over the plant floor, thereby improving blend accuracy and plant safety and housekeeping.
A new batch gravimetric blender reportedly stops the frequent problem of leaking pellets all over the plant floor, thereby improving blend accuracy and plant safety and housekeeping. Conair in Pittsburgh completely encloses the weighing and mixing section of its new TrueBlend models, thus preventing escape even of fines and dust. The unit also has double-acting, non-stick vertical dispense valves that reportedly are not prone to sticking like horizontal valves, and they are pneumatically driven in both directions, so they don’t depend on a spring return action. Each dispense valve has a conical seat that makes it self-centering. Plunger/seat combinations can be changed to create smaller openings for dispensing minor ingredients. The controls can be set to Precision Additive mode when a difference of a pellet or two is critical for a low-volume ingredient. This mode gives priority to the weight of that ingredient and adjusts weights of all other components accordingly. In this mode, minor components reportedly can be held within ±0.5% of setpoint. TrueBlend controls are said to be easy to use. They lead operators through set-up of two to six ingredients on the 5.7-in. color graphic touchscreen. The system stores up to 50 recipes, and an optional Conveying Control feature allows seven receivers and one pump to be set up from the blender control. Eight TrueBlend models range from 200 to 3500 lb/hr. Larger models (over 6000 lb/hr) are due out later this year.