scholarly journals Sustainable Additive Manufacturing: Mechanical Response of High-Density Polyethylene over Multiple Recycling Processes

Recycling ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 4
Author(s):  
Nectarios Vidakis ◽  
Markos Petousis ◽  
Athena Maniadi
Keyword(s):  
Additive Manufacturing ◽  
Mechanical Behavior ◽  
High Density Polyethylene ◽  
Mechanical Response ◽  
Positive Impact ◽  
Research Work ◽  
High Density ◽  
Fused Filament Fabrication ◽  
Recycled Materials ◽  
Polymer Recycling

Polymer recycling is nowadays in high-demand due to an increase in polymers demand and production. Recycling of such materials is mostly a thermomechanical process that modifies their overall mechanical behavior. The present research work focuses on the recyclability of high-density polyethylene (HDPE), one of the most recycled materials globally, for use in additive manufacturing (AM). A thorough investigation was carried out to determine the effect of the continuous recycling on mechanical, structural, and thermal responses of HDPE polymer via a process that isolates the thermomechanical treatment from other parameters such as aging, contamination, etc. Fused filament fabrication (FFF) specimens were produced from virgin and recycled materials and were experimentally tested and evaluated in tension, flexion, impact, and micro-hardness. A thorough thermal and morphological analysis was also performed. The overall results of this study show that the mechanical properties of the recycled HDPE polymer were generally improved over the recycling repetitions for a certain number of recycling steps, making the HDPE recycling a viable option for circular use. Repetitions two to five had the optimum overall mechanical behavior, indicating a significant positive impact of the HDPE polymer recycling aside from the environmental one.

scholarly journals Sustainable Additive Manufacturing: Mechanical Response of Acrylonitrile-Butadiene-Styrene over Multiple Recycling Processes

2020 ◽  
Vol 12 (9) ◽  
pp. 3568 ◽  
Author(s):  
Nectarios Vidakis ◽  
Markos Petousis ◽  
Athena Maniadi ◽  
Emmanuel Koudoumas ◽  
Achilles Vairis ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Mechanical Behavior ◽  
Mechanical Response ◽  
Positive Impact ◽  
Research Work ◽  
Acrylonitrile Butadiene Styrene ◽  
Experimental Simulation ◽  
Recycling Rate ◽  
Fused Filament Fabrication ◽  
Butadiene Styrene

Sustainability in additive manufacturing refers mainly to the recycling rate of polymers and composites used in fused filament fabrication (FFF), which nowadays are rapidly increasing in volume and value. Recycling of such materials is mostly a thermomechanical process that modifies their overall mechanical behavior. The present research work focuses on the acrylonitrile-butadiene-styrene (ABS) polymer, which is the second most popular material used in FFF-3D printing. In order to investigate the effect of the recycling courses on the mechanical response of the ABS polymer, an experimental simulation of the recycling process that isolates the thermomechanical treatment from other parameters (i.e., contamination, ageing, etc.) has been performed. To quantify the effect of repeated recycling processes on the mechanic response of the ABS polymer, a wide variety of mechanical tests were conducted on FFF-printed specimens. Regarding this, standard tensile, compression, flexion, impact and micro-hardness tests were performed per recycle repetition. The findings prove that the mechanical response of the recycled ABS polymer is generally improved over the recycling repetitions for a certain number of repetitions. An optimum overall mechanical behavior is found between the third and the fifth repetition, indicating a significant positive impact of the ABS polymer recycling, besides the environmental one.

Analytical interpretations of structural and mechanical response of high density polyethylene/hydroxyapatite bio-composites

2012 ◽  
Vol 36 ◽  
pp. 757-766 ◽  
Author(s):  
Harjeet S. Jaggi ◽  
Yogesh Kumar ◽  
Bhabani K. Satapathy ◽  
Alok R. Ray ◽  
Amar Patnaik
Keyword(s):  
High Density Polyethylene ◽  
Mechanical Response ◽  
High Density

Polylactic acid and high‐density polyethylene blend: Characterization and application in additive manufacturing

2020 ◽  
Vol 137 (48) ◽  
pp. 49602
Author(s):  
Muhammad Harris ◽  
Johan Potgieter ◽  
Sudip Ray ◽  
Richard Archer ◽  
Khalid Mahmood Arif
Keyword(s):  
Additive Manufacturing ◽  
Polylactic Acid ◽  
High Density Polyethylene ◽  
High Density ◽  
Polyethylene Blend

scholarly journals Performance of a Cooling Tower with the Use of a New Kind of High-density Polyethylene (HDPE) Packing

2021 ◽  
Author(s):  
Nagam Obaid Kariem ◽  
◽  
Mohammed A. Rasheed ◽  
Zainab T. Al-Sharify ◽  
◽  
...  
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Water Flow ◽  
High Density Polyethylene ◽  
Cooling Tower ◽  
Water Flow Rate ◽  
Research Work ◽  
High Density ◽  
Airflow Rate ◽  
Flow Rates

This research work deals with the performance of high-density polyethylene sheets arranged in splash used as a fill for a cooling tower. “A forced-draught counter flow cooling tower” of 400 mm × 400 mm cross-sectional area and 1.7m in height was built. The fill has been studied theoretically and experimentally. Air rates of 0.6, 1.2, and 1.8 kg/s.m2 were utilized with water flow rates within the range of 1 to 1.6 kg/s.m2. The overall volumetric heat transfer coefficient, volumetric mass transfer coefficient (Mt), and the tower characteristics (Mt/L) are shown to be functions of the air and water flow rates concurrently. Four available input parameters were inlet water temperature, airflow rate, water flow rate, and full height. A computer program was prepared to perform numerical analysis for reducing data sets obtained from the plant. In addition, analysis was carried out for evaluating the volumetric heat and mass transfer coefficients along with the performance coefficient.

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