Designing of an original extruding system for 3D printing of parts made of plastic material in powder-state form

AbstractMicrowave imaging of shallow buried objects has been demonstrated with holographic radar for landmine detection, civil engineering and cultural heritage. A key component of this system is the antenna based on a truncated cylindrical waveguide with two feeds. This paper investigates for the first time a manufacturing technology based on the 3D printing of a volumetric cylindrical plastic antenna. The investigation of this manufacturing technology was motivated by the reduction in the antenna size and customization of the electromagnetic characteristics to the radio frequency electronics mounted on the robotic scanning system. The antenna that was designed using a simulator and filled with polylactic acid plastic material (relative dielectric permittivity Ɛr = 2.5) is compared to the metal antenna, both operating at around 2 GHz. The goal was to replicate the characteristics of the void core antenna to be able to provide the same quality/information of the microwave images of shallow buried objects. Finally, we compared the scan results of dielectric and metal targets both in the air and in natural soil. From the observation of some of the characteristics of the images, such as dynamics, morphology of the target, signal-to-noise ratio, and operating distance, we demonstrate that 3D printing for volumetric cylindrical waveguide antenna could be used to obtain compact and easily adaptable antennas for different applications in remote sensing.

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The impact of thermal reprocessing of 3D printable polymers on their mechanical performance and airborne pollutant profiles

Journal of Polymer Research ◽

10.1007/s10965-021-02723-7 ◽

2021 ◽

Vol 28 (11) ◽

Author(s):

Antti Juho Kalevi Väisänen ◽

Lauri Alonen ◽

Sampsa Ylönen ◽

Isa Lyijynen ◽

Marko Hyttinen

Keyword(s):

3D Printing ◽

Mechanical Performance ◽

Plastic Material ◽

Ultrafine Particle ◽

Poly Lactic Acid ◽

Testing System ◽

Multiple Materials ◽

Airborne Pollutant ◽

Mechanical Performances ◽

The Impact

AbstractThe alterations in volatile organic compound (VOC) and ultrafine particulate (UFP) matter emission profiles following thermal reprocessing of multiple materials were examined. Additionally, mechanical performance of the materials was studied. The VOCs were identified by collecting air samples with Tenax® TA tubes and analyzing them with a GC–MS system. UFP concentrations were monitored with a portable ultrafine particle counter. Total VOC emissions of all materials were reduced by 28–68% after 5 thermal cycles (TCs). However, slight accumulation of 1,4-dioxane was observed with poly(lactic acid) materials. UFP emissions were reduced by 45–88% for 3D printing grade materials over 5 TCs but increased by 62% in the case of a waste plastic material over 3 TCs. The mechanical performance of the materials was investigated by measuring their tensile strengths (TSs) and elastic moduli (EM) with an axial-torsion testing system. The reprocessed materials expressed fluctuations in their 3D printing qualities and mechanical performances. The mechanical performances were observed to reduce only slightly after 5 TCs, and the trend was observable only after the data was mass-normalized. The TSs of the samples were reduced by 10–24%, while the EM were reduced by 1–9% after 5 TCs. The TS and EM of one material were increased by 14 and 33%, respectively. In conclusion, recycled polymers are plausible 3D printing feedstock alternatives as they possess acceptable mechanical performance and low emittance according to this study. Furthermore, non-3D printing grade polymers may be applied in a 3D printer with caution.

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Stress State of 3D-Printed Plastic Dies at Thin-Sheet Aluminum Bending

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.316.110 ◽

2021 ◽

Vol 316 ◽

pp. 110-115

Author(s):

L.B. Aksenov ◽

I.Y. Kononov ◽

N.G. Kolbasnikov

Keyword(s):

3D Printing ◽

Mechanical Characteristics ◽

Plastic Material ◽

Thin Sheet ◽

Small Scale ◽

Scale Production ◽

Sheet Bending ◽

Sheet Aluminum ◽

3D Printed ◽

Positive Properties

The paper deals with the problems and prospects of forming thin-sheet blanks, using ABS plastic dies, made by 3D printing. This technology combines the positive properties of plastic material and 3D-printing. The mechanical characteristics of the plastic were determined experimentally. On the basis of computer modeling, the dependence between the angle of bending the blank and the stresses arising in the dies is established. As a result of computer simulation and physical experiment, the value of the maximum thickness 0.5 mm for the aluminum 3003 blank is obtained. In this case, there is no plastic deformation of the plastic tool. The use of plastic dies does not require lubrication. The technology of sheet bending, using a plastic tool, can be implemented with the greatest efficiency in single and small-scale production.

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Construction Of Plastic Waste Extruding Machine To Produce Filaments Of 3D Printing Machine

10.21203/rs.3.rs-805152/v1 ◽

2021 ◽

Author(s):

Muhammad Luthfi Sonjaya ◽

Mutmainnah Mutmainnah ◽

Muh Farid Hidayat

Keyword(s):

3D Printing ◽

Polylactic Acid ◽

Plastic Material ◽

Research Process ◽

Plastic Waste ◽

Needs Analysis ◽

3D Printer ◽

Machine Parameter ◽

Function Testing ◽

Printing Machine

Abstract This paper presents design and development of plastic waste extruding machine to provide 3D printing filaments. The motivation of this research is to create a 3d printer filament from plastic waste using simple machine components. In addition, another goal is to create valuable items from plastic waste. The research process begins with design, needs analysis, machine rebuilding and electrical assembly, machine function testing, analysis of filament, and filament testing in 3D printing machine. The categories of shredded plastic material were plastic cups (polypropylene, PP) and a mixture of plastic bottles (polyethylene terepththalate, PET) and plastic cups (polypropylene, PP). The analysis of the research was the capacity of the extrusion machine, the best temperature in producing filaments based on shapes and sizes, and testing of 3D printing filaments of plastic waste which was applied to the 3D printing machine. The result showed that 190°C was the greater temperature to heat the barrel, machine capacity of each plastic waste category, and the characteristic plastic waste was almost similar compared to market filament of polylactic acid (PLA) in terms of filament size and 3D printing machine parameter.

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Experimental Research Using the 3D Printing Technology with Plastic Materials for Prehension Systems Jaws

Materiale Plastice ◽

10.37358/mp.18.1.4955 ◽

2018 ◽

Vol 55 (1) ◽

pp. 20-23

Author(s):

Adrian Popescu ◽

George Enciu ◽

Tiberiu Dobrescu ◽

Nicoleta Elisabeta Pascu

Keyword(s):

3D Printing ◽

Experimental Research ◽

Plastic Material ◽

Experimental Tests ◽

Geometric Shape ◽

3D Printer ◽

Teaching Platform ◽

Pneumatic Actuation ◽

3D Printing Technology ◽

Plastic Materials

The studies presented in this article are based on the variation of some constructive parameters on various types of materials for a prehension system jaws. The pneumatic actuation prehension system is part of the structure of a manipulator integrated within a teaching platform for installation. In the tests, the varied parameters were the following: the type of plastic material, the way of printing on the 3D printer bed, the degree of fill (the density) and the geometric shape. The experimental tests have resulted in an optimal version of the prehension system jaws.

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Design, Fabrication and Implementation of a High-Performance Compliant Nanopositioner via 3D Printing with Continuous Fiber-Reinforced Composite

Journal of Micromechanics and Microengineering ◽

10.1088/1361-6439/ac331b ◽

2021 ◽

Author(s):

Mengjia Cui ◽

Erwei Shang ◽

Shouqian Jiang ◽

Yu Liu ◽

Zhen Zhang

Keyword(s):

3D Printing ◽

High Performance ◽

Compliant Mechanisms ◽

Plastic Material ◽

Industrial Applications ◽

Structure Design ◽

Fiber Reinforced ◽

Precision Engineering ◽

Vertical Stiffness ◽

Mechanical Performances

Abstract Nanopositioning systems have been widely applied in scientific and emerging industrial applications. With simplicity in design and operation, flexure bearings with spatial constraints and voice coil based nano-actuators are considered in designing compliant compact nanopositioning systems. To achieve nano-metric positioning quality, monolithic fabrication of the positioner is preferred, which calls for 3D printing fabrication. However, conventional plastic material-based 3D printing suffers from low mechanical performances, and it is challenging to monolithically fabricate 3D compliant mechanisms with high mechanical performances. Here, we study the fabrication of continuous carbon fiber reinforced composites by 3D printing of the double parallelogram flexure beam structures for spatial constrained nanopositioner with enhanced vertical stiffness. Also, with the consideration of the beam structure design, the process parameters for embedding the carbon fibers are optimized to enhance the beam strengths. Experimental results demonstrate a significant performance improvement with the composite based nanopositioner in both stiffness and natural frequency, and its positioning resolution of 30 nm is achieved. The result of this study will serve as the building block to apply advanced 3D printing of composite structure for precision engineering in the presence of more complex spatial structures.

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