Making it possible to accurately add both regrind and color to natural resin, the Dual TrueFeed™ gravimetric feeder from Conair has two material hoppers and a control system that adjusts color percentages if regrind percentage varies. If no regrind is involved, the second hopper could also be used to stage a second color for quick changeover.

The Conair TrueFeed color and additive feeders use gravimetric (loss-in-weight) metering technology that improves accuracy and makes the units simpler to operate. Unlike volumetric feeders, which have been standard in the plastics industry for years, gravimetric feeders are self-calibrating, adjusting automatically for changes in material type, bulk density or pellet geometry.

The control system tracks material dispensed and compares it to the programmed feed rate, adjusting continually to maintain the correct proportion of ingredients. When feeding color and regrind, the color side of the feeder can be slaved to the regrind side so that more or less color is dispensed depending on how much regrind (which is already colored) is being used. An optional communications package is available to deliver material usage data to a central host computer for inventory control or process documentation.

The TrueFeed control is easy to use. The operator sets the color or additive percentages, enters the part weight and cycle time, and presses the start button. No calibration is required for accurate, consistent metering. And once set-up is complete, the operating parameters can be stored in memory for easy recall the next time the same job is run. The system can store up to 1500 set-ups.

Like all Conair TrueFeed feeders, the dual-hopper model incorporates patented rotating metering tubes, which dispense process ingredients with exceptional accuracy, even at rates as low as 0.02 gm/sec. This metering technology eliminates the uneven delivery or “surging” that is associated with conventional auger-type feeders.

Options include integrated compressed air loading system, larger 0.4 cu ft (12-liter) hoppers, and a slide-out mounting arrangement that make cleaning and calibration easier.

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