scholarly journals Fabrication of Extrudate Filaments from Waste Polyethylene Terephthalate Plastics for 3D Printers

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Favour C. Eboh ◽  
Opeyemi Osideko ◽  
Modupe Onitiri
Keyword(s):  
Energy Efficiency ◽  
Rapid Prototyping ◽  
Polyethylene Terephthalate ◽  
Environmental Problems ◽  
Manufacturing Processes ◽  
3D Printer ◽  
Compression Zone ◽  
Feed Zone ◽  
3D Printers ◽  
Waste Polyethylene

The use of 3D printers for manufacturing processes comes with the challenge of filament replacement for subsequent processes. This aforementioned including the environmental problems posed by plastics wastes formed the basis for the current work which is focused on design and construction of a simple single extruder for the production of filaments from waste polyethylene terephthalate (PET) plastics for rapid prototyping machines and 3D printers. Three Band heaters were used to melt the PET plastics and a screw was used to move the melted PET plastics longitudinally along the barrel. The screw is consisted of three zones namely feed zone, compression zone and metering zone. The temperature of the band heaters is controlled by a Digital temperature controller. This paper describes the design, fabrication and testing of a filament extruder. A 2mm die was used to extrude the filament to1.75 mm. The performance of the system was quantified through relevant tests and the findings reported. When the barrel and die assembly are at 200°C, melting begins to occur and at 230°C, the extrudate begins to appear at the metering zone. The energy efficiency of the system was found out to be 75.2%. Keywords— 3D printer, Design, Extruder, Filament, Polyethylene terephthalate. 

scholarly journals Moineau-based pumps for the volumetric extrusion of pellets

2016 ◽  
Author(s):  
E. Canessa ◽  
Marco Baruzzo ◽  
Carlo Fonda
Keyword(s):  
Rapid Prototyping ◽  
Double Helix ◽  
Vertical Direction ◽  
3D Printer ◽  
Screw Pump ◽  
Viscous Material ◽  
3D Printers

We report on our on-going research to create a volumetric extruder for pellets or granules of recycled plastic to be used in a RepRap FDM 3D printer for rapid prototyping, by combining a rotor made of a Moineau progressing cavity pump coupled with an Auger screw, both contained inside a heated stator. We also introduce an alternative multi-layer Moineau-based pump –easier to build, implement and clean– for pumping a quantity of viscous material in vertical direction. The latter, our screw pump model 131313, consists of a steer Auger portion which increases the pressure inside a layered double-helix stator-like container as a layered helical rotor-like is turned.-we have recently shown (Jan 2017) how our multi-layer Moineau-based pump extrudes a quantity of viscous plastic PLA, which could be used in RepRap 3D printers -see YouTube video: https://www.youtube.com/watch?v=KVAJQfXY_PE

Utilization of air-plasma treated waste polyethylene terephthalate particles as a raw material for particleboard production

2016 ◽  
Vol 90 ◽  
pp. 188-194 ◽  
Author(s):  
Petr Klímek ◽  
Tomáš Morávek ◽  
Jozef Ráhel ◽  
Monika Stupavská ◽  
David Děcký ◽  
...  
Keyword(s):  
Polyethylene Terephthalate ◽  
Raw Material ◽  
Air Plasma ◽  
Waste Polyethylene

scholarly journals Foundation Piles—A New Feature for Concrete 3D Printers

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2545
Author(s):  
Marcin Hoffmann ◽  
Krzysztof Żarkiewicz ◽  
Adam Zieliński ◽  
Szymon Skibicki ◽  
Łukasz Marchewka
Keyword(s):  
3D Printing ◽  
Rapid Development ◽  
Construction Materials ◽  
Shallow Foundation ◽  
Soil Reinforcement ◽  
3D Printer ◽  
Permanent Formwork ◽  
3D Printers ◽  
New Feature ◽  
The Cost

Foundation piles that are made by concrete 3D printers constitute a new alternative way of founding buildings constructed using incremental technology. We are currently observing very rapid development of incremental technology for the construction industry. The systems that are used for 3D printing with the application of construction materials make it possible to form permanent formwork for strip foundations, construct load-bearing walls and partition walls, and prefabricate elements, such as stairs, lintels, and ceilings. 3D printing systems do not offer soil reinforcement by making piles. The paper presents the possibility of making concrete foundation piles in laboratory conditions using a concrete 3D printer. The paper shows the tools and procedure for pile pumping. An experiment for measuring pile bearing capacity is described and an example of a pile deployment model under a foundation is described. The results of the tests and analytical calculations have shown that the displacement piles demonstrate less settlement when compared to the analysed shallow foundation. The authors indicate that it is possible to replace the shallow foundation with a series of piles combined with a printed wall without locally widening it. This type of foundation can be used for the foundation of low-rise buildings, such as detached houses. Estimated calculations have shown that the possibility of making foundation piles by a 3D printer will reduce the cost of making foundations by shortening the time of execution of works and reducing the consumption of construction materials.

scholarly journals Implementing a 3D printing service in a biomedical library

2017 ◽  
Vol 105 (1) ◽  
Author(s):  
Verma Walker, MLIS
Keyword(s):  
Problem Solving ◽  
3D Printing ◽  
3D Modeling ◽  
Three Dimensional ◽  
National Institutes Of Health ◽  
3D Printer ◽  
Service Model ◽  
Steep Learning Curve ◽  
3D Printers ◽  
Creative Problem

Three-dimensional (3D) printing is opening new opportunities in biomedicine by enabling creative problem solving, faster prototyping of ideas, advances in tissue engineering, and customized patient solutions. The National Institutes of Health (NIH) Library purchased a Makerbot Replicator 2 3D printer to give scientists a chance to try out this technology. To launch the service, the library offered training, conducted a survey on service model preferences, and tracked usage and class attendance. 3D printing was very popular, with new lab equipment prototypes being the most common model type. Most survey respondents indicated they would use the service again and be willing to pay for models. There was high interest in training for 3D modeling, which has a steep learning curve. 3D printers also require significant care and repairs. NIH scientists are using 3D printing to improve their research, and it is opening new avenues for problem solving in labs. Several scientists found the 3D printer so helpful they bought one for their labs. Having a printer in a central and open location like a library can help scientists, doctors, and students learn how to use this technology in their work.

Kinematic Error Modeling of Delta 3D Printer

2021 ◽  
Vol 1037 ◽  
pp. 77-83
Author(s):  
Andrew V. Kochetkov ◽  
T.N. Ivanova ◽  
Ludmila V. Seliverstova ◽  
Oleg V. Zakharov
Keyword(s):  
Low Cost ◽  
Travel Speed ◽  
Error Modeling ◽  
3D Printer ◽  
Structural Components ◽  
Deterministic Models ◽  
End Effector ◽  
Positioning Errors ◽  
Parallel Movement ◽  
3D Printers

The development of additive manufacturing requires the improvement of 3D printers to increase accuracy and productivity. Delta kinematics 3D printers have advantages over traditional sequential kinematics 3D printers. The main advantage is the high travel speed due to the parallel movement of the platform from three pairs of arms. Another advantage is the relatively low cost due to the small number of structural components. However, delta 3D printers have received limited use. The main reason is the low positioning accuracy of the end effector. Errors in the manufacture and assembly of components of a parallel drive mechanism add up geometrically and cause an error in the position of the end effector. These formulas can be applied to a 3D printer as well. However, well-known studies consider deterministic models. Therefore, the analysis is performed for limiting size errors. The purpose of this article is to simulate the effect of statistical errors in displacements and arm lengths on the positioning errors of a platform with the end effector. The article effectively complements the field of error analysis research and provides theoretical advice on error compensation for delta 3D printer.

Sign in / Sign up

Export Citation Format

Share Document