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Energy-saving recycling systems

Source:Ringier Release Date:2012-02-21 644
Plastics & Rubber
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Washing plant delivered by Herbold Meckesheim

Recycling systems are expected to be in high demand in the coming years due to the worldwide focus on environment protection. The search for the best waste management methods to reduce the need for landfilling and incineration and convert waste materials efficiently into usable products has created opportunities for technology and equipment suppliers.
A new post-consumer film recycling plant launched by WRZ-H?rger in Sontheim has a wash/separation line capable of increased capacity of up to 7000 tonnes annually where DSD film waste is recycled into high-quality agglomerate or regrind. The turn-key plant -- delivered by Herbold Meckesheim -- consists of a wet size-reduction step with an upstream separation device for extraneous materials, separation technology based on a hydrocyclone and a mechanical/thermal drying step. Downstream of the plant operates a plastcompactor to transform the film material into agglomerate with excellent flowing properties and high bulk density. The end product can be used for the production of moulded parts.
The whole recycling chain is situated in one site, from collecting over sorting to recycling and is therefore in line with the current trend: Curbside collectors and sorting companies are installing their own recycling technology, and processors of recycled materials are also installing their own reclamation technology. This adds to the effectiveness of the recycling process, and the operator benefits in terms of value creation from two or even three steps, from collecting to the manufacture of the end product.
BOPET and BOPP films with heavily printed surface or metallised cannot be treated with traditional recycling processes, or at least only with great difficulty due to the high standards required for the degasification of extruders. Herbold succeeded in finding a reliable solution through the plastcompactor. Designed as an "open" system, it can successfully cope with entirely printed or metallised films.
The Herbold plastcompactor transforms film waste in agglomerate with excellent flow properties and a very high bulk density that can then be further processed on injection moulding machines or extrusion plants similar to new material. The material is continuously processed between a rotating and a stationary compactor disc, equipped with screwed-on exchangeable kneading bars. The pre-size-reduced material is continuously conveyed to the working zone through the centre of the stationary disc. The friction arising at and between the compactor discs very quickly heats the material, rendering it slightly sintered. Afterwards, the heated material is fed to a hot melt granulator, turning it into agglomerate with good flow properties and a high bulk density.
The procedure is a particularly economic one and due to the automatic operation, no operators are needed. The densifier for plastics, available in several sizes, achieves a throughput performance between 100 and 1.400 kg/h. Besides the treatment of uncontaminated waste, the plastcompactor can also be used downstream of a washing line for contaminated waste: here the material is dried at the same time, a process that can very easily and effectively be achieved with very thin LLDPE films or with LLDPE stretch films.

ECON Underwater Pelletiser 50

Sustainability assured
The EREMA plastic recycling systems have already been able to make a valuable contribution to sustainability. With the launch of this system, EREMA's customers have not only had the benefit of high recycled pellet quality, they have also been able to considerably reduce CO2 emissions, power consumption and, asShop Womens Socks - View the Large Range

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