process feature | Recycling The ‘open-
hearted’ design of Rapid’s
Raptor plastics shredders
makes them
easy to access for cleaning and mainte- nance
stilling chamber, the polymer is pumped directly into the production process. The system is available for capacities of 100-2,000kg/h.
The Jump system from Gneuss uses polycondensa- tion to improve the intrinsic viscosity of recycled PET
Liquid benefit NGR of Austria says that its own polycondensation system – which it has begun selling it to end users – has a twist: it works in the liquid phase. The company says that the system, called PReact, converts PET scrap into food-grade PET in a single step. “We are already running one line in the US for PET sheet,” said Michael Heinzlreiter, chief marketing officer at NGR. When PET breaks down, water molecules are formed at the ends of the polymer chains. Removing this water – under vacuum – encourages the chain ends to link together, which makes the polymer chain longer and increases the intrinsic viscosity (IV). Heinzlreiter says this is the first time that polycon- densation has been done in the liquid phase. “The solid phase takes hours, while the liquid
phase takes minutes,” he said. “This is good for decontamination.” The company has teamed up with Kuhne to supply a
system that combines a shredder-feeder-extruder for producing the plastic melt, PReact to improving PET quality, and a sheet production system from Kuhne. Four units have so far been
sold into the market – with a fifth due to come onstream in Asia this year.
Recyclate stability Other recycling technologies were also in evidence at the
show. Baerlocher, for instance, introduced two new technologies for stabilising recycled materials
– in this case, polyolefins – at K2016. The main technology, developed by Baerlocher USA, is the company’s Baeropol RST (resin stabilisation technology). This is an anti-oxidant technology that allows the use of secondary anti-oxidant phosphites to be eliminated or reduced – while maintaining resin properties through multiple heat histories. The company has incorporated the RST technology
into a line of preformulated One-Packs designed to provide economical resin stabilisation for the polyethyl- ene and polypropylene recycling industries. The new additive helps to raise melt stability, as well
as protecting against long-term ageing and colour fading. “We discovered it when we were working with
upstream customers,” said Gregory Andersen, business manager for Baeropol. He said that phosphites traditionally have solubility
problems – and can precipitate at loadings above 800ppm. “With Baeropol RST there are no solubility issues,”
he said. The fact that the additives are generally regarded as
safe (‘GRAS’), they do not need approval in order to be used in new applications. Baeropol RST also forms the basis of the company’s T-Blends, which incorporates traditional stabilisers to
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