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Development of Sink-Float Density Separation Process of Mixed Automotive Plastics for Mechanical Recycling


[ 1 ] Instytut Technologii Materiałów, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ 2 ] Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ P ] employee | [ SzD ] doctoral school student

Scientific discipline (Law 2.0)

[2.9] Mechanical engineering

Year of publication


Chapter type

chapter in monograph / paper

Publication language


  • Flotation
  • Plastic recycling
  • Post-cable waste
  • Processing
  • Composite

EN In this chapter, a method for the separation of mixed polymeric waste from the automotive industry for the efficient recovery of raw materials for mechanical recycling was proposed. The topic of the study was shredded mixed polymeric waste, which was subjected to separation in several stages (for liquids of different specific densities) using the sink-float density method. In this process, the mixed plastics were separated into a heavy fraction and a light fraction, consisting of plastics of lower specific density in comparison with the medium in which the flotation process was carried out. Next, the selected separated material fractions were subjected to heat pressing to prepare standardized test samples intended to evaluate the quality of the polymer blends produced. The mechanical properties were evaluated by a static tensile test in which the tensile modulus, tensile strength, elongation at maximum tensile strength, tensile at the break, and elongation at break were determined. Microscopic evaluation of the fractured surface obtained in the static tensile test was also evaluated. The obtained test results allowed us to evaluate the efficiency of the separation process using the flotation method and allowed us to determine the most advantageous composition of the composite. The study showed that by sink-float separation it is possible to recover pure polymer fractions for industrial applications.

Date of online publication


Pages (from - to)

115 - 130





7th EAI International Conference on Management of Manufacturing Systems

Presented on

7th EAI International Conference on Management of Manufacturing Systems (MMS 2022), 5-7.10.2022, Krynica-Zdrój, Polska

Ministry points / chapter


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