TECHNOLOGY | MATERIALS PREPARATION
Right: Single Ultra dryer from Maguire throat-mount- ed for feeding PET to a preform injection moulding system
The VBD (Vacuum Batch Dryer) series, which came out in 2010, remedied this problem, with a vertical arrangement and larger heating hoppers. The VBD range has since evolved into the Ultra range, with upgrades such as load cells that enabled real-time monitoring of moisture levels, and with smarter controls that enable scheduling of drying operations. Maximum throughputs range from 50 up to 500 kg/h. K 2019 saw the introduc- tion of the medium-sized Ultra 600 model, and there are indications that K 2022 will see a further development aimed particularly at larger PET preform producers. Crittenden notes that outside PET processing, the biggest call for dryers from injection moulders comes from those processing polyamides. These present a particular challenge, he says, because there are so many different formulations, based in different polymers, and they all behave differently. “Drying can take up to a day with a desiccant dryer,” he says. “An Ultra dryer can do it in an hour.” Despite the fact that vacuum dryers have been on the market for over 20 years, they are still a niche product. One reason may be that Maguire has ring-fenced its IP, so it is almost alone in the
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