Abstract
High and low density polyethylene materials constitute about 48% of total weight of plastics waste in Europe, that depends on the frequent use of these materials in packaging applications. This paper analyze the recycling effect on the mechanical properties of high and low density polyethylene (HDPE and LDPE). A mechanical recycling process was tested for the plastics waste of high and low density polyethylene, then a tensile and impact tests were performed on different mixing ratios for each of the both materials ranging from 100% of the virgin material and up to 100% of the recycled material with a difference of 10% of the sample to the other. This paper discusses the tensile properties of tensile stress at the fracture, elongation and modulus of elasticity and the impact test results for HDPE and LDPE were compared with each other.
Highlights
A mechanical recycling process was tested for the plastics waste of high and low density polyethylene, a tensile and impact tests were performed on different mixing ratios for each of the both materials ranging from 100% of the virgin material and up to 100% of the recycled material with a difference of 10% of the sample to the other
The results of tension tests of (HDPE) samples show an increase in tensile stress of a sample consisting of recycled materials for 10% and of pure materials for 90% (27.55 MPa) (Figure 1), while tensile stresses decrease as the percentage of recycled materials (HDPE) increases by more than 10% in the mixture until it reaches 60%, and the stress values increase until the sample is 100% recycled materials (HDPE)
The results obtained in the course of tensile tests of samples made of (LDPE) show an increase in tensile stress of a sample consisting of recycled materials for 10% and of pure materials for 90% (9.57 MPa), and a decrease in values of this stress as a percentage of the amount of recycled materials (LDPE) increased by more than 10% in the mixture until its ratio reached 50%, and tensile stress values increase after this percentage, but changes are in a limited range (9.01-9.98 MPa) (Figure 1)
Summary
The solution of plastic packaging waste problem in many cases can be realized by their mechanical or chemical processing. In this study, a mechanical treatment process was carried out, which consists of sorting, washing and granulating high (HDPE) and low (LDPE) density materials. Tensile and shock resistance test procedure was performed at various ratios of mixing recycled and pure materials to study the effect of the recycling process on mechanical properties of the aforementioned polyethylene materials and to discover the effectiveness of recycling to receive granules with good mechanical properties compared to the pure materials
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