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1 Journal of Polish CIMAC

1 2012

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Recycling abilities of thermoplastic ionomers, as exemplified by SURLYNR

Sykutera D., Czyżewski P.

Journal of Polish CIMAC

2012

Vol. 7, no 3

301-308

The results presented in this paper apply to the research of grinding and cutting process of ionomer copolymer (E/MAA) under the trade name SurlynŽ from DuPont company. Processing of this material is difficult and its susceptibility to mechanical recycling is limited. The results presented here are an important part of research concerning management of ionomer waste formed in the injection moulding process (defective moulded pieces with and the thick-walled injection moulding waste). The plastic material under examination is applied in the line of perfume, the products are expected to have transparency of the glass and don't have disqualifying surface defects. This requires the use of non-standard conditions in the injection moulding process and the construction of complicated structures of injection moulding tools (ie, three plate mould), along with valve gate hot runner systems. In the structure of three plate mould we use cold runner system in hot runner injection moulds, the former of which forms the so-called injection waste, i.e. runner, which further increases the cost of the tool. In the case of plastics considered, injection waste constitutes up to 30 percent of the weight of the moulded piece, which, with high prices of this plastic (SurlynŽ price is more than three times higher than the commonly used polyolefin materials) and reduced re-use possibilities, constitutes unaccepted, additional cost of production. This paper is an attempt to develop favorable conditions for the process of grinding of SurlynŽ in terms of its re-use in secondary processing. The study shows that the temperature of feed has a significant impact on the level of thermal load of the material subjected to grinding and cutting, as well as on the effectiveness of disintegration.