Analysis of dimensional stability of recycled plastic material obtained by grinding

Abstract

A study to identify the products of grinding process for the purposes of the recycling of elements, installations and materials made from polymers was proposed. The ground material was analyzed, evaluated and then described using the latest granulometric models. Based on the stability models, a mathematical description of granulometric distribution of particle size of the recycled polymer products obtained in the grinding process was found.

Modeling of the Forces and Area Milling of the Plastics in Recycling

“…Assuming E=2.1×10 5 MPa for steel, and E=10 5 MPa for cast iron, one calculates the values of coefficient A for the shaft [2,3,6]: hardened steel -A=15, toughened steel -A=21, cast iron -A=16.…”

“…The loads in grinding unit are most frequently examined and analysed in the context of the existing databases of other solutions, otherwise one is bound to create original databases [1,2,6]. Great amount of data must be collected and stored to provide information on diverse conditions of machining (type of process, geometry and material of the tool, work piece material, cutting speed, etc.).…”

Recent Advances in Development of Waste-Based Polymer Materials: A Review

“…The second step of waste plastics and rubber recycling is grinding or granulation, which allows for a suitable size reduction that is necessary for further processing (e.g., extrusion, injection molding) [17]. As presented by Al-Zubiedy [18], the dimensionally stable precision grinding design should include the following aspects: (i) polymer characteristics (structure and properties) and (ii) granulation/grinding method (construction, tools, and machines) and conditions (mixing, shearing, temperature). The combination of the above-mentioned factors affects the disintegration mechanisms of waste plastics and rubber and consequently features of obtained products, such as particle size distribution, average particle size, or surface morphology [19].…”