machinery | Materials handling This now means that users can interface with the
control using any Internet-connected device. Any operation that can be performed on the dryer interface – monitoring conditions, changing settings, responding to alarms, troubleshooting or downloading process data – can also be performed remotely. The DC-A control is based on the Allen-Bradley
micro 850 PLC platform that supports many advanced capabilities. It has a 7in colour display with intuitive graphical design, minimal text and no function codes to decipher. It provides descriptive help screens for operators and features auto-start capabilities, pass- word protection and has Conair’s Drying Monitor capabilities built in. Trending capabilities simplify maintenance and troubleshooting, while providing users with information they can use to optimise drying parameters and save energy. The control is standard equipment on Carousel Plus
dryer Models 15 to 300, and on MDCW Models 15 to 200. Carousel Plus Models 150 to 400 are available with either the DC-A control or the DC-T, which has a larger touch screen.
Higher aspirations Vent Tec 2.0 is a new generation of high-performance aspiration systems for heating/cooling mixer combina- tions from MTI Mischtechnik. The company says that the devices are the first to control their operation autonomously – as a function of actual process parameters – to provide constant processing conditions. This helps to maintain high product quality in the plastics processing. Main applications include the production of rigid and
Right: Maguire’s LoPro vacuum
loading system is shorter, and easier to
operate than standard systems
soft PVC dryblends and thermal processes where Vent Tec 2.0 devices dehumidify the mixture or reduce the volatiles content. The new generation aspirator systems are available in various sizes for all mixing volumes and accommo- dating nearly all ATEX environments and mixer designs. Thanks to their autonomous control technology, they can also be retrofitted to other manufac- turers’ machines. At high process tem-
peratures, even low humidity levels can interfere with the process. This is especially relevant for PVC recipes containing hygroscop- ic stabiliser systems. Without high-performance aspiration, it may
36 FILM & SHEET EXTRUSION | May 2017
cause massive deposits on the interior surfaces of heating mixers, cooling mixer walls, extruder dies and calibration devices. The potential consequences can include diminished mixing quality, extruder problems and fluctuations in product quality. In these situations, Vent Tec technology provides high dehumidification rates for constant production results. It compensates for variations in raw material moisture and seasonal influences on the processing properties of the mixture, to provide high dryblend quality with ultimate humidities ranging down to below 0.05%.
Short benefit Maguire Products says that its LoPro vacuum loading system is much shorter – and easier to operate and maintain – than standard systems. It is used to convey pellets and regrind from storage to single or multiple blenders, is simpler to operate than standard systems and consists of autonomously controlled receivers that are 80% shorter than conventional material loaders and receivers. The device’s low-profile receivers protrude only 200mm (8in) above the lid of a blender, providing a low centre of gravity that minimises potential sway on fast-cycling processing machines. Each receiver is self-controlled, with no central control required. Connection and installation is simple, with plug-and- play cabling and sequential linking of components. Receivers load on a first-in/first-out basis. Vacuum is supplied from a ‘mini-central’ unit mounted on a portable floor stand or on the blender frame. The discharge or ‘dump’ flap in the LoPro receiver is
up to six times wider than the flap on traditional upright receivers, making possible a dump time of only 1-2 seconds per cycle, depending on material flow properties. Maintenance has been simplified, as all operating components are housed in a removable module that allows the
receiver to remain in place. This makes it possible to perform quick, on-the-fly cleaning and maintenance. Modules are interchangeable, allowing production to continue if service is needed. Because access is from the side of the module rather than the top as with conventional units, it is easier to check the system and access the filter. A patented blow-back system provides effective filter cleaning at the end of each cycle, eliminating need
for manually cleaning the filter.
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