2016 | Recycling technology
Nordson’s HiCon R-Type 250 transforms contaminated polyolefin or styrenic plastics into clean, high- quality material
Jump into PET reprocessing Gneuss has combined its MRS extruder with its new Jump system for reprocessing PET waste into high value products. The MRS extruder – which offers high levels of
devolatilisation and decontamination – is traditionally combined with a rotary disc melt filtration system and a viscometer, to form a Gneuss Processing Unit (GPU). The GPU is often used to reprocess bulky PET waste such as industrial waste from fibre and film manufacture. Now, Gneuss has developed its Jump system which is
Gentle washing Lindner WashTech says that its new Rafter system offers a gentle, efficient way to clean highly contami- nated, pre-shredded plastic waste – such as packaging, bottles or film – by removing extraneous material and pre-washing the charge in one single step. There are three phases to the Rafter cleaning
The Jump
system from Gneuss uses
polycondensa- tion to improve the intrinsic viscosity of recycled PET
process. First, a special conveyor screw pulls the contaminated material under the water surface so that heavy contaminants such as metal, stones or glass can precipitate. In a second phase, particles sticking to the plastic such as sand or soil are removed by a paddled rotor – whose rotational speed can be adapted to the degree of contamination. (This step is performed in a stationary drum, and separates floating or precipitated particles by means of plate screens.) After the washing cycle, the pre-cleaned waste rises to the surface, and delivered to subsequent process steps by a feed screw. The line has a nominal throughput of 1,500-2,500kg/h, and supports continuous in-line reconditioning of plastic waste all the way to the finished granulated recyclate or recycled film. The actual throughput can be adapted to the pace of upstream and downstream equipment with a frequency converter. It is cost-efficient to operate, thanks to its energy-opti- mised drive system and a water demand of only 3-10m³/h. “By integrating the Rafter
into a recycling line to pre-wash the plastic waste, operators gain an effective and economical method of reducing wear in downstream reconditioning equipment,” said Harald Hoffmann, managing director at Lindner WashTech.
60 FILM & SHEET EXTRUSION | October 2016
installed directly downstream of the GPU. It ensures an accurate, controllable intrinsic viscosity (IV) boost of the PET by up to 0.3 in the melt phase. It is an alternative to conventional SSP (solid state) systems and enables direct reintroduction of the polymer into the production process without the need to remelt the PET, says Gneuss. Depending on its properties, industrial waste is first
fed through a shredder or a knife mill until the size is reduced so that it can be fed into the extruder. This can mean either compaction of the size reduced waste or a crammer feeder fitted directly to the extruder. Once it has been purified and homogenised, polymer
is fed into the Jump, where the polymer melt is kept under vacuum as it passes over rotating elements. By controlling residence time and the speed of the rotating elements, controlled polycondensation takes place that boosts IV by as much as 0.3dl/g. The Jump system avoids the ingress of oxygen so that yellowing is reduced to a minimum. After the PET melt has passed through a stilling chamber, the polymer is pumped directly into the production process. The Jump system is available for capacities of 100-2,000kg/h.
Recycling 4.0 in four parts Erema says it is ushering in ‘Recycling 4.0’ with the launch of its Careformance concept. Careformance consists of four components: its Intarema recycling system; its QualityOn package of
sensors; its Re360 Manufacturing Execution System (MES); and its online shop.
“Building on the high degree of
automation of the Intarema systems, we have developed a Smart Factory package that enables us to give customers a clear competitive edge and make them fit for the future,” said Manfred Hackl, CEO of
Erema. QualityOn is a set of specially
www.filmandsheet.com
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