TECHNOLOGY | MACHINERY RECYCLING
Separator technology protects recycling and processing equipment
Bunting Europe will showcase its expertise in magnetic separators and metal detectors for the recycling and plastics industries at K2019. In virgin plastic manu- facturing processes, metal damages processing equipment and the quality of the end-product. Recycled plastic commonly has both ferrous and non-ferrous metal contami- nation, and removal is vital to enable the reuse of the waste material, says the company. Bunting’s portfolio includes a wide range of magnetic separators and metal detectors to detect and remove metals.
PIPE COATING Large die head for coating PO pipe
Conextru of Austria says it has supplied its largest cross head for polyolefin pipe coating.
Coating polyethylene (PE) pressure pipes is a significant trend, says the company. It involves covering the PE100 pipe with an additional polypropylene (PP) layer, via a coating process. This 1-3mm PP layer protects the pipe when it is installed in a trench without sand, which reduces the cost of installation. The PO 1000 CR pipe
heads that make the pipes are 400-1000mm in diameter, and have a maximum throughput of 250 kg/h. The distribution system is a helical spiral of 36 channels, which is specially designed for low
56 PIPE & PROFILE EXTRUSION | September 2019
output and low volume. PP and PE do weld together, so the grip or adhesive force is by shrinking the PP to the PE pipe. Different process parameters can influence this grip – with PE pipe temperature being the most important. The whole coating equipment has a
range of 400-1000mm, and has an electrical box as an interface for all power cables and thermocouples. A C 45 30 extruder, with maximum output of 250 kg/h PE and 200 kg/h of PP, includes a barrier screw and ABB PLC control. A second extruder (C 30 25), with maximum output of 5 kg/h provides colour stripe material. �
www.conextru.eu
www.pipeandprofile.com
Its FF and HF drawer filter magnets are the most commonly used magnetic separators in the plastics sector. Visitors will see both standard and manual-clean (MSC) designs, which all use high strength neodymium iron boron (rare earth) magnets. In operation, plastic
beads or shredded plastic waste falls through the drawer filter under gravity, while ferrous metal contami- nation is attracted to the surface of the magnets. The company will display its new FF350 drawer filter magnet in Europe for the first time. The FF350 enables processing material at higher temperatures.
High heat is damaging to standard rare earth magnets and the new design main- tains magnetic strength at temperatures up to 350F (175°C). There are also
changes to the housing, window and access fixings to provide trouble-free operation at these tempera- tures. The company will also display the plate magnet (with and without tapered step) and grate magnets (round and square). “Our experience in solving metal contamination issues in the plastics sector is second to none,” said Simon Ayling, managing director of Bunting Europe. “Without removing metal from waste, the recycling of plastic is simply not possible.” n The next issue of PPE will include extensive coverage of recycling machinery. �
www.buntingeurope.com
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