Experimental Investigation of PolyJet 3D Printing Process: Effects of Finish Type and Material Color on Color Appearance

2019 ◽  
Author(s):  
Xingjian Wei ◽  
Li Zeng ◽  
Zhijian Pei
Keyword(s):  
Experimental Investigation ◽  
3D Printing ◽  
Color Appearance ◽  
3D Printer ◽  
Printing Process ◽  
Full Color ◽  
Process Effects ◽  
Main Effects

Abstract The Stratasys J750 PolyJet printer is capable of printing full-color parts. However, little information is currently available about the effects of finish type and material color on color appearance of parts printed by the PolyJet process. In this study, the effects of finish type and material color on color appearance of PolyJet printed parts are investigated; two finish types (glossy and matte) and four material colors (cyan, magenta, yellow, and black) are considered. The results suggest that the main effects of finish type and its interactions with material color are significant. Especially, the effects of finish type when material color is black are more significant among the material colors. These results would be valuable to users of the full-color PolyJet 3D printer.

Experimental Investigation of Stratasys J750 PolyJet Printer: Effects of Finish Type and Shore Hardness on Dimensional Accuracy

2019 ◽  
Author(s):  
Xingjian Wei ◽  
Ketan Thakare ◽  
Li Zeng ◽  
Zhijian Pei
Keyword(s):  
Experimental Investigation ◽  
Dimensional Accuracy ◽  
3D Printer ◽  
Limited Information ◽  
Shore Hardness ◽  
Control Factors ◽  
Full Color

Abstract The J750 PolyJet printer is the newest model of full-color and multi-material 3D printer from Stratasys. Currently, limited information is available about the effects of control factors on dimensional accuracy of parts printed by this printer. In this study, the effects of two control factors, finish type and Shore hardness, on dimensional accuracy are investigated. The results suggest that both control factors significantly affect dimensional accuracy. Specifically, samples printed with glossy finish exhibit more accurate dimensions than those with matte finish, and larger Shore hardness value leads to better dimensional accuracy. These results would be valuable to researchers and practitioners who use the J750 3D printer.

3D Printing and Growth Induced Bending based on PET-RAFT Polymerization

2020 ◽  
Author(s):  
Chris Bainbridge ◽  
Kyle Engel ◽  
Jianyong Jin
Keyword(s):  
3D Printing ◽  
Surface Properties ◽  
Raft Polymerization ◽  
Advanced Manufacturing ◽  
3D Printer ◽  
4D Printing ◽  
Printing Process ◽  
Raft Agent ◽  
3D Printed ◽  
First Time

4D printing has steadily become an emerging area of advanced manufacturing research and has produced some truly fantastic innovations. Previously we have demonstrated the 3D printing process based on PET-RAFT polymerization, and its subsequent capability in the post-production modification of surface properties. In this work, (1) we further optimized the PET-RAFT 3D printing formulation by replacing RAFT agent CDTPA with BTPA and adjusting the monomers composition; (2) we also observed the photodegradation of the photocatalysts EB and EY under 405nm light and the effects this has on 3D printing; (3) we then did successful 3D printing using a commercial 405nm DLP 3D printer, with an improved build speed of up to 2286 µm/hr; (4) lastly, for the first time we have demonstrated a method for growth induced bending of a 3D printed strip, where the growth on one side of the strip causes stress and the strip bends accordingly to reach a more comfortable position.

Experimental Investigation of Stratasys J750 PolyJet Printer: Effects of Finish Type and Shore Hardness on Surface Roughness

2019 ◽  
Author(s):  
Xingjian Wei ◽  
Abhinav Bhardwaj ◽  
Li Zeng ◽  
Zhijian Pei
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Lower Surface ◽  
3D Printer ◽  
Limited Information ◽  
Shore Hardness ◽  
Control Factors ◽  
Full Color

Abstract The J750 PolyJet printer is the newest model of full-color and multi-material 3D printer from Stratasys. Currently, limited information is available about the effects of control factors on surface roughness of parts printed by this printer. In this study, the effects of two control factors, finish type and Shore hardness, on surface roughness are investigated. The results suggest that both control factors significantly affect surface roughness. Specifically, samples printed with glossy finish have lower surface roughness than those with matte finish, and larger value of Shore hardness leads to lower surface roughness. These results would be valuable to researchers and practitioners who use the J750 3D printer.

Experimental Investigation of PolyJet 3D Printing Process: Effects of Orientation and Layer Thickness on Thermal Glass Transition Temperature

2019 ◽  
Author(s):  
Jackson Sanders ◽  
Xingjian Wei ◽  
Zhijian Pei
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Layer Thickness ◽  
Elastic Moduli ◽  
3D Printer ◽  
Limited Information ◽  
Control Factors ◽  
Full Color ◽  
Process Effects

Abstract The J750 PolyJet printer is the newest model of full-color and multi-material 3D printer from Stratasys. Currently, limited information is available about the effects of control factors on thermal glass transition temperature of parts printed by this printer. In this study, the effects of two control factors, printing orientation and layer thickness, on the thermal glass transition temperature (Tg) are investigated. The results suggest that both control factors significantly affect Tg. Specifically, samples printed using the high mix mode have higher elastic moduli than those printed using high quality mode. Larger values of elastic moduli directly lead to a higher thermal glass transition temperature, making the material more effective under relatively extreme temperatures and duress. These results would be valuable to researchers and practitioners who use the Polyjet 3D printer.

scholarly journals 3D Printing and Growth Induced Bending based on PET-RAFT Polymerization

2020 ◽  
Author(s):  
Chris Bainbridge ◽  
Kyle Engel ◽  
Jianyong Jin
Keyword(s):  
3D Printing ◽  
Surface Properties ◽  
Raft Polymerization ◽  
Advanced Manufacturing ◽  
3D Printer ◽  
4D Printing ◽  
Printing Process ◽  
Raft Agent ◽  
3D Printed ◽  
First Time

4D printing has steadily become an emerging area of advanced manufacturing research and has produced some truly fantastic innovations. Previously we have demonstrated the 3D printing process based on PET-RAFT polymerization, and its subsequent capability in the post-production modification of surface properties. In this work, (1) we further optimized the PET-RAFT 3D printing formulation by replacing RAFT agent CDTPA with BTPA and adjusting the monomers composition; (2) we also observed the photodegradation of the photocatalysts EB and EY under 405nm light and the effects this has on 3D printing; (3) we then did successful 3D printing using a commercial 405nm DLP 3D printer, with an improved build speed of up to 2286 µm/hr; (4) lastly, for the first time we have demonstrated a method for growth induced bending of a 3D printed strip, where the growth on one side of the strip causes stress and the strip bends accordingly to reach a more comfortable position.

Results of studying the dimensional accuracy of the bases of complete removable prostheses made using 3D printing and traditional technologies

2020 ◽  
pp. 34-39
Author(s):  
Vokulova Yu.A. Vokulova ◽  
E.N. Zhulev
Keyword(s):  
3D Printing ◽  
Traditional Method ◽  
Laser Scanning ◽  
Laser Scanner ◽  
Digital Technologies ◽  
Dimensional Accuracy ◽  
3D Printer ◽  
Significance Level ◽  
Average Value ◽  
The Difference

This article presents the results of studying the dimensional accuracy of the bases of complete removable prostheses made using a 3D printer and the traditional method. Bases of complete removable prostheses were made using an intraoral laser scanner iTero Cadent (USA) and a 3D printer Asiga Max UV (Australia). To study the dimensional accuracy of the bases of complete removable prostheses, we used the DentalCAD 2.2 Valletta software. The Nonparametric Wilcoxon W-test was used for statistical analysis of the obtained data. We found that the average value of the difference with the standard for bases made using digital technologies is 0.08744±0.0484 mm. The average value of the difference with the standard for bases made by the traditional method is 0.5654±0.1611 mm. Based on these data, we concluded that the bases of complete removable prostheses made using modern digital technologies (intraoral laser scanning and 3D printer) have a higher dimensional accuracy compared to the bases of complete removable prostheses made using the traditional method with a significance level of p<0.05 (Wilcoxon's W-test=0, p=0.031). Keywords: digital technologies in dentistry, digital impressions, intraoral scanner, 3D printing, ExoCAD, complete removable dentures.

Influence of Constructive and Technological Parameters at Generated Spiral Parts with DLP 3D Printing Process

2019 ◽  
Vol 56 (4) ◽  
pp. 801-811
Author(s):  
Mircea Dorin Vasilescu
Keyword(s):  
3D Printing ◽  
Great Influence ◽  
Polymerization Process ◽  
Generation Process ◽  
Technological Parameters ◽  
Printing Process ◽  
The Third ◽  
Solid Models ◽  
Specific Factors ◽  
Printing Processes

This work are made for determine the possibility of generating the specific parts of a threaded assembly. If aspects of CAD generating specific elements was analysed over time in several works, the technological aspects of making components by printing processes 3D through optical polymerization process is less studied. Generating the threaded appeared as a necessity for the reconditioning technology or made components of the processing machines. To determine the technological aspects of 3D printing are arranged to achieve specific factors of the technological process, but also from the specific elements of a trapezoidal thread or spiral for translate granular material in supply process are determined experimentally. In the first part analyses the constructive generation process of a spiral element. In the second part are identified the specific aspects that can generation influence on the process of realization by 3D DLP printing of the two studied elements. The third part is affected to printing and determining the dimensions of the analysed components. We will determine the specific value that can influence the process of making them in rapport with printing process. The last part is affected by the conclusions. It can be noticed that both the orientation and the precision of generating solid models have a great influence on the made parts.

scholarly journals Efficient 3D printing via photooxidation of ketocoumarin based photopolymerization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiaoyu Zhao ◽  
Ye Zhao ◽  
Ming-De Li ◽  
Zhong’an Li ◽  
Haiyan Peng ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Visible Light ◽  
Light Exposure ◽  
Three Dimensional ◽  
3D Printer ◽  
Light Penetration ◽  
Viable Solution

AbstractPhotopolymerization-based three-dimensional (3D) printing can enable customized manufacturing that is difficult to achieve through other traditional means. Nevertheless, it remains challenging to achieve efficient 3D printing due to the compromise between print speed and resolution. Herein, we report an efficient 3D printing approach based on the photooxidation of ketocoumarin that functions as the photosensitizer during photopolymerization, which can simultaneously deliver high print speed (5.1 cm h−1) and high print resolution (23 μm) on a common 3D printer. Mechanistically, the initiating radical and deethylated ketocoumarin are both generated upon visible light exposure, with the former giving rise to rapid photopolymerization and high print speed while the latter ensuring high print resolution by confining the light penetration. By comparison, the printed feature is hard to identify when the ketocoumarin encounters photoreduction due to the increased lateral photopolymerization. The proposed approach here provides a viable solution towards efficient additive manufacturing by controlling the photoreaction of photosensitizers during photopolymerization.

Sign in / Sign up

Export Citation Format

Share Document