PLAST 2018 | EVENT REVIEW
high as 8% when its VTS (Vacuum Twin Stuffer) is incorporated on a 37-D line and as high as around 15% with 54-D lines. Gamma Meccanica exhibited a new Tandem
line for reprocessing heavily printed, high humidity and contaminated plastic materials. The company said the technology was developed to meet specific needs of recyclers. It said the technology makes it possible to recover hard-to-recycle materials that otherwise would be destined for landfill. “Tandem technology guarantees the excellent quality of the granule with notable energy savings,” it said. The line is composed of a Compac cutting and compacting unit, two extruders arranged in succession, a high-performance degassing chamber, two screen changers and a pelletiser system. The Compac system allows for processing material of various sizes. It preheats the material and then compresses it to render it suitable for extrusion. The short, non-vented primary extruder and the larger-diameter secondary extruder (separated by a degassing chamber) allow for a reduction of the cutting forces and put less stress on the melted material than in a single extruder. In the degas- sing chamber, the surface of material exposed to vacuum is 10 times greater than the exposure of a normal extruder, guaranteeing the extraction of large quantities of gas and contaminants. Another important benefit of the
Tandem line is the possibility to have double filtration. The first is allocated between the primary and secondary extruder, and the second filtration is installed before the pelletiser.
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Melt filtration specialist Fimic had a different
take on filtering highly contaminated materials. It displayed its ERAmelt filtration system, a single unit which filters material twice, using meshes of two different sizes; the first mesh may be 400 micron and the second one 150, for example. Sales Director Erica Canaia pointed out that with laser- perforated filters being so expensive, holes in the first filter are punched out, and only the second filter is laser-perforated. The system provides an interesting and cost-effec- tive alternative to the use of two extruders, each with its own single filter. Fimic has just installed two systems at a customer in Canada. Cofit had its new Gorillabelt T automatic and continuous screen changer on view at the Italian show. This too is for heavy recycling and high filtration levels (up
to 50 micron). Cofit says it can handle waste plastics – it highlights building and agricultural film waste in particular, as well as post-con-
Above: ICMA HT unit for processing waste with low bulk density shown at Plast 2018
Left: Fimic ERA unit on display at Plast 2018
PHOTO: PETER MAPLESTON
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