MACHINERY | MATERIALS HANDLING
Right: Conair says the
impeller design of its HRG
Series vacuum pumps generate deep vacuum power
Deep vacuum Conair says that the multi-stage regenerative impeller design of its new HRG Series vacuum pumps generate the deep vacuum power required to convey plastic pellets over long distances – while keeping noise levels low. “Until now, processors have had to accept trade-offs when selecting a central vacuum pump for conveying applications,” said Nick Paradiso, product manager for conveying and bulk storage products at Conair. Each option has positives and negatives, he says: single-stage regenerative pumps are quiet and inexpensive, but limited to short-distances; dual-stage regenerative pumps handle moderate distances, but can be noisy and have limited throughput; positive displacement pumps offer greater power, but low-cost versions can be noisy; and long distance pumps (LDPs), while effective, can be expensive. The new hybrid regenerative (HRG) pumps offer many positive features of other pump types but cost around 30% less than a comparable LDP pump and in line with higher-end PD pump packages, he said. The secret to the HRG’s power is its tightly
toleranced, three-stage impeller design, which cuts, captures, and compresses air with minimal draft or vibration, says the company. HRG pumps can sustain vacuum levels up to 18in Hg and convey material up to 1000 linear feet. Operating at 60 Hz, the average sound level ranges between 74 and 77 dBA, which does not require hearing protection.
HRG pumps can be equipped with an optional variable-speed drive motor and used with Conair’s Wave Conveying systems. “Instead of conveying plastic materials in dilute-phase at speeds of 5000 ft/min or more and creating dust, angel hair and equipment wear, the Wave Conveying System allows for gentle, low- speed conveying at speeds of 300 to 2800 ft/min,” said Paradiso. “This virtually eliminates material breakage, dust, and angel hair without reducing throughput.” The pumps are available in three different sizes: the HRG-10 has an 11.5hp motor and is intended for 2.5in conveying lines; the HRG-15 (16.9hp) and the HRG- 30 (42.9hp) service up to 3in line sizes, says Conair.
36 PIPE & PROFILE EXTRUSION | October 2020
Tracking changes Conair has also devel- oped the TrueRate inventory tracking system, which tracks changes in the inventories of up to 500 different resins or flowable powders in a processing plant. Devised as an
alternative to using single-component batch blenders for resin inventory measurement,
it uses accurate gravimetric measurement, says the company.
It is available in two sizes, consisting of an 8in weighing ring equipped with two load cells, or a 12in ring equipped with three. Both configurations connect to a separate electrical control panel containing a PLC. The weighing ring is mounted below a material loader or receiver but above a container or bin. It uses resin information from the user to
calculate the change in weight of the loader/ receiver before discharging the material through the ring and into the container. The system can operate in two modes: in default (or ‘totaliser’) mode, in which it continuously and automatically measures the total resin flow through the receiver to a bin or container below; and, in job (or ‘active’) mode, which adds an optional dis- charge valve to the weighing ring. “TrueRate is a new, elegant way to track and
regulate the receipt, flow, and use of resins and flowable powders through a plastics processing facility,” said Alan Landers, product manager for blending at Conair. “In totaliser mode, the system can accurately measure and validate the quantity of resin conveyed from a process bin that was loaded from a silo.”
“In job mode, an operator can program the system to measure out a precise amount of material into a bin.”
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.aircontrolindustries.com �
www.motan-colortronic.com �
www.koch-technik.com �
www.movacolor.com �
www.moretto.com �
www.coperion.com �
www.maguire.com �
www.conairgroup.com
www.pipeandprofile.com
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