DRYING: New Vacuum Dryer Exceeds Throughput Expectations

Extensive production-scale test runs with a redesigned vacuum dryer produced higher throughput than originally specified and achieved required dryness in just 35 min after a cold startup.

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Extensive production-scale test runs with a redesigned vacuum dryer produced higher throughput than originally specified and achieved required dryness in just 35 min after a cold startup. Those test results were reported recently by Maguire Products, Inc., Aston, Pa., whose VBD 1000 vacuum dryer was introduced last spring in a completely redesigned format (see May 2013 Keeping Up). The key new feature of the dryer is a vertical arrangement of the multi-stage drying process instead of the previous rotary corousel. The result is many fewer moving parts and reduced wear and maintenance. Maguire introduced a smaller VBD-150 model at the K 2013 show in Dusseldorf in October (see Jan. 2014 review of news in auxiliaries at the show).

The Maguire VBD-150 was originally rated for throughput of up to 150 lb (68 kg)/hr, but the tests show it easily exceeds 200 lb (90 kg)/hr with ABS, acrylic, nylon, PC, PEI, and PBT, according to Pat Smith, v.p. of marketing and sales. He notes that the dryer’s ability to deliver process-ready resin in just over half an hour is in sharp contrast with a conventional desiccant dryer that takes up to 4 hr to bring resin from a cold startup to sufficient dryness for molding.

Additional productivity enhancements are available with two new optional features: One is an EasySlide mechanism that enables the vacuum vessel to slide out for easy cleaning. This provides access to the retention hopper as well as the vacuum vessel. The other new feature is an optional hopper extension whose 1 ft3 (0.028 m3) capacity extends the throughput of the dryer by 25%.

(610) 459-4300 • maguire.com

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