RESIN CONVEYING: Powder Loaders Available in Two Configurations

Said to be ideal for handling PVC and other powders down to 1 micron.

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Two new powder-conveying units from the Conair Group, Cranberry Township, Pa., are said to be ideal for handling PVC and other powders down to 1 micron, and dusty regrind as well. Available in a PR (powder receiver) model—for use in central vacuum systems—and a self-contained PM model (photo) with integral vacuum motor, they both offer excellent conveying and filtration rates.

The integral-motor version is ideal for conveying material from gaylords or bins directly to a molding machine or extruder. The PM motor loaders come in three sizes, with conventional DC brush or brushless motors. They can transport up to 1000 lb/hr (454 kg/hr) over distances up to 50 ft (15.25 m).

The PR powder receivers come in five different sizes ranging in volume from 0.14 to 3 ft³ (4 to 85 l) and accommodate line sizes up 4 inch (101 mm) OD.

Both units operate the same way. Air and material are drawn into the receiver by the central vacuum pump or the integral motor. The powder remains in bottom of the receiver while conveying air and any suspended particles are drawn upward past as many as three pleated polyester cartridge filters that separate air from particulate. At the end of every load cycle (when an integrated fill sensor registers that the receiver is full), a blowback system directs high-power blasts of compressed air down through the filters, blowing off accumulated material, dust and fines. In this way, each new loading cycle starts with a clean filter. A 3:1 air-to-cloth ratio ensures maximum filtration efficiency.

The largest PR receiver has 168 ft² (15.5 m²) of filter area, and the PM units have up to 56 ft² (5.2 m²), and yet they are compact enough to be used even in low-headroom areas.

The PM motor loader is programmed, controlled and monitored by a Conair ELC-M (Easy Loader Control) with LED icons. An optional ControlMate pendant expands the capabilities of the basic ELC controls by allowing users to enable higher-level functions and change settings that need less frequent adjustment.  It comes complete with a 10-ft. (3-m) power/communications cable so operators can safely adjust settings from ground level – no need to climb on the machine to reach the receiver-mounted ELC. The ControlMate pendant can be stored in surface-mount cradle for convenient access and easy storage.

PR model receivers can also be controlled by the ELC, or a Universal Terminal Box (UTB) that connects to any Conair central material-handling controls systems, including the FLX-128, ELS or B-32 loading controls.