MATERIALS HANDLING | MACHINERY


Material gains: latest


in materials handling Conveying, blending, mixing and other processes ensure that raw materials such as resins and additives are brought together prior to the extrusion process


Materials handling equipment is generally seen as playing a subsidiary role to that of the main extrusion process – fetching and carrying the raw materials that are then converted into finished products. However, improvements in control systems mean that some systems can play a greater role in the process than ever before. For example, Maguire has developed a new blender with built-in extrusion control which, when combined with a suitable supervisory system, can control the extrusion line from start to finish. The system has been shown to be effective in pipe and profile applications, as well as for


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sheet, and blown and cast film. The WXB Weigh Extrusion Blender incorporates a gain-in-weight (GIW) weigh bin and a loss-in- weight (LIW) mix chamber in a single machine, along with a 4088 controller. While GIW weighs batch ingredients as they are dosed sequentially into the weigh bin, the LIW mix chamber allows accurate metering of the blend into the processing machine and facilitates control of extrusion and haul-off in accordance with process variables. The tight tolerance achieved by the blender (within +/- 0.1%) is a key to conserving raw material. The 4088 controller, Maguire’s most advanced


Main image: The M2000/ K8000 mixing unit that MTI showed at NPE was delivered to PVC pipe producer Northern Pipe Products after the show


October 2018 | PIPE & PROFILE EXTRUSION 29


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