articoli | FONTE: Speciale Plastix - october 2010

How can we determine whether an injection molding machine is suitable for operating in a clean room? And what is the most suitable machine type? A specific study answers to these questions

New life for mixed plastics

by Carlo Latorre

Apart from PET bottles and rigid mono-material containers, most plastics obtained from separate waste collection consists of a heterogeneous mix, often “dirty” and low purity, which for this reason is unsuitable for mechanical recycling. The plasmix, as is often called, is intended for incineration, landfi ll or, in some rare cases, a poor re-use in mixtures of cement mortars and concretes. A value that often does not reward even the mere energy content of the material.

The problem of reusing these mixtures – composed not only from diff erent plastics, but also additives, fi llers, pigments and impurities - is the diffi culty to regenerate and convert them into new products without incurring degradation that makes them virtually unusable. A problem apparently solved by a company from Friuli, Plaxtech in Udine, founded to construct and market a new type of systems developed for the low pressure molding of large objects from heterogeneous polyolefi ns mixtures from separate waste collection or industrial scrap, with a residue and charge content of up to 15%.

Low pressure and multi-injection

Baptized Roteax, the plant was presented in Udine on last April 8th, after a decade of research, of which three for the only industrial experimentation on a prototype developed to test and refi ne the process. 16 meters long and up to 7 meters high, with lateral dimensions of 6 meters, the line can produce up to four diff erent molded items at low pressure, using for this purpose a four position rotary table. From the functional …….

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