Russian Biotechnological University
Moscow, Russian Federation
Moscow, Russian Federation
Moscow, Russian Federation
Moscow, Russian Federation
Moscow, Russian Federation
UDK 621.798.01 Принципы и теория упаковки: пакуемость, способность упаковываться, влияющие факторы и условия, дефектная упаковка и т.д.
Trade enterprises, production and consumers leave a significant amount of packaging waste that requires recycling. For this purpose, in a closed-loop economy, the state sets certain requirements that are related, among other things, to the frequency of recycling, which is determined by the nature of the materials. For polymers, namely polyolefins, it has become established that they cannot be recycled more than 2–3 times due to a significant loss of technological and operational properties. The paper presents the results of experimental studies of multiple extrusion processing of polyethylene and polypropylene over 10 consecutive cycles. Each processing cycle was accompanied by measurements of physical and mechanical properties (elongation at break and tensile strength), measurements of melt flow index, changes in chemical structure and yellowness index (YI) for the original and processed polymers. It is proposed to evaluate the suitability of materials for multiple processing not by individual indicators, but by a set of properties that ultimately determine both the technological properties and the ability to be processed, as well as the operational properties and resistance to aging. For this purpose, we proposed to combine six individual indicators, which were taken as a unit for the initial samples, and the total value, which we called the criterion of technological aging, was determined as the area of the composed hexagon. In this case, the area of the hexagon of the original sample was taken as 1, or 100%, and the area of the resulting hexagon after each processing cycle was determined by the ratio to the original value. As is customary in polymer research practice, the criterion of suitability was considered to be deviations in the total value, which did not exceed ±20%. This allowed us to determine the number of polyethylene processing cycles as 9, and polypropylene as 8 cycles, which exceeds the established standard values.
polymers, packaging, modeling of multiple processing, complex aging index, recycling
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