Benchmarking print quality of additively manufactured ceramic nanosuspensions toward consistent fabrication using laser stereolithography

2021 ◽  
Author(s):  
Celeste A. Brown ◽  
Nicholas Charipar ◽  
Charles Rohde ◽  
Grant Warner ◽  
Alberto Piqué
Keyword(s):  
Print Quality ◽  
Laser Stereolithography

scholarly journals A Comprehensive Investigation on 3D Printing of Polyamide 11 and Thermoplastic Polyurethane via Multi Jet Fusion

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2139
Author(s):  
Wei Shian Tey ◽  
Chao Cai ◽  
Kun Zhou
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Wear Rate ◽  
Mechanical Performance ◽  
Thermoplastic Polyurethane ◽  
Print Quality ◽  
Polyamide 11 ◽  
Powder Bed

Multi Jet Fusion (MJF) is a recently developed polymeric powder bed fusion (PBF) additive manufacturing technique that has received considerable attention in the industrial and scientific community due to its ability to fabricate functional and complex polymeric parts efficiently. In this work, a systematic characterization of the physicochemical properties of MJF-certified polyamide 11 (PA11) and thermoplastic polyurethane (TPU) powder was conducted. The mechanical performance and print quality of the specimens printed using both powders were then evaluated. Both PA11 and TPU powders showed irregular morphology with sharp features and had broad particle size distribution, but such features did not impair their printability significantly. According to the DSC scans, the PA11 specimen exhibited two endothermic peaks, while the TPU specimen exhibited a broad endothermic peak (116–150 °C). The PA11 specimens possessed the highest tensile strength in the Z orientation, as opposed to the TPU specimens which possessed the lowest tensile strength along the same orientation. The flexural properties of the PA11 and TPU specimens displayed a similar anisotropy where the flexural strength was highest in the Z orientation and lowest in the X orientation. The porosity values of both the PA11 and the TPU specimens were observed to be the lowest in the Z orientation and highest in the X orientation, which was the opposite of the trend observed for the flexural strength of the specimens. The PA11 specimen possessed a low coefficient of friction (COF) of 0.13 and wear rate of 8.68 × 10−5 mm3/Nm as compared to the TPU specimen, which had a COF of 0.55 and wear rate of 0.012 mm3/Nm. The PA11 specimens generally had lower roughness values on their surfaces (Ra < 25 μm), while the TPU specimens had much rougher surfaces (Ra > 40 μm). This investigation aims to uncover and explain phenomena that are unique to the MJF process of PA11 and TPU while also serving as a benchmark against similar polymeric parts printed using other PBF processes.

scholarly journals Washing treatment impact on print quality of screen printed knitted fabrics

2016 ◽  
Vol 21 (3) ◽  
pp. 817-826
Author(s):  
Mladen Stančić ◽  
Branka Ružičić ◽  
Nemanja Kašiković ◽  
Dragana Grujić ◽  
Dragoljub Novaković ◽  
...  
Keyword(s):  
Print Quality ◽  
Knitted Fabrics ◽  
Screen Printed

scholarly journals Erratum

1995 ◽  
Vol 15 (4) ◽  
pp. 719-719
Keyword(s):  
Magnetic Resonance Imaging ◽  
Blood Flow ◽  
Electrical Impedance ◽  
Neonatal Rat ◽  
Print Quality ◽  
Resonance Imaging ◽  
Excitotoxic Injury ◽  
Cereb Blood Flow ◽  
Neonatal Rat Brain

Early Evolution and Recovery from Excitotoxic Injury in the Neonatal Rat Brain: A Study Combining Magnetic Resonance Imaging, Electrical Impedance, and Histology Menno van Lookeren Campagne, Jeroen B. Verheul, Klaas Nicolay and Robert Balázs [Originally published in J Cereb Blood Flow Metab 1994;14(6):JOll-J023] The print quality of Fig. 6G in the above article was poor and the figure therefore lacked the necessary detail. The publisher apologizes for this and reprints Fig. 6 , in its entirely, with the legend below. [Figure: see text]

scholarly journals The Significance of Computer Modeling and 3D Printing Technology for Facial Ectoprosthetics

2020 ◽  
pp. paper62-1-paper62-10
Author(s):  
Svetlana Cherebylo ◽  
Vyacheslav Vnuk ◽  
Evgeniy Ippolitov ◽  
Mikhail Novikov ◽  
Pavel Mitroshenkov ◽  
...  
Keyword(s):  
3D Printing ◽  
Computer Modeling ◽  
Information Technologies ◽  
Surgical Intervention ◽  
Computer Navigation ◽  
Navigation Systems ◽  
Facial Plastic ◽  
Laser Stereolithography ◽  
Huge Challenge

The integration of information technologies in healthcare practice significantly changes the methods of diagnosis and treatment, the forms of interaction of doctors with patients and colleagues, the organization of treatment and recovery of health. The field of reconstruction of the auricle is still a huge challenge for facial plastic surgeons and requires at various techniques to find the best treatment for each patient. The paper describes the application of computer modeling and laser stereolithography technology in surgical practice for auricular surfaces ectoprosthetics. To improve the accuracy and quality of the surgical intervention the positioning of external prosthesis is applied with the aid of personal templates and computer navigation. The accuracy of ectoprosthesis positioning when using a plastic mask template was 0.3-0.4 mm, while computer navigation was 0.1 - 0.2 mm. Using personalized templates is a simpler and more intuitive way of positioning that does not require expensive computer navigation systems. This example of ectoprosthetics shows the possibilities of various reconstructions of facial organs, not only the ear, but also, for example, the nose, using computer modeling and 3d printing technologies

scholarly journals ANALYZING THE EFFECT OF DENSITY VALUE DEVIATION ON PRINT QUALITY

KREATOR ◽  
2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Soebardianto . ◽  
Septia Ardiani ◽  
Romi Setiawan
Keyword(s):  
Quality Control ◽  
Quality Parameters ◽  
Quality Level ◽  
Print Quality ◽  
Machine Material ◽  
Digital World ◽  
Quality Control Parameters ◽  
Density Values ◽  
Standard Density

The quality control activities, in particular the measurement of density values, are part of the quality control parameters carried out by each company. Companies sometimes forget about the quality parameters of the name, even though the quality can give the printed products a good guarantee in the eyes of consumers. To achieve the quality level, of course, the business does not stand idle, there are several things that need to be done or provided by the business to support the quality, namely man (human), machine (machine), material (material), and method (method). In the development of technology in an increasingly advanced digital world, companies want to continue to compete with a digital world by making inroads, this of course gives the products produced by the company a good or a good level of quality. In this discussion, there is an identification of problematic aspects arising from the deviation of density values as well as ways to obtain standard density values and factors that affect the quality of prints on book cover prints using a Heidelberg machine.Keywords—Quality Control, Density, Standart, Product, Deviation

Research on Image Detection Technology of Printing Based on Dynamic Partitioning Method

2013 ◽  
Vol 469 ◽  
pp. 377-382
Author(s):  
Li Chen ◽  
Wan You Tang
Keyword(s):  
Detection System ◽  
Rapid Development ◽  
Image Resolution ◽  
Print Quality ◽  
Paper Machine ◽  
Defect Classification ◽  
Vision Inspection ◽  
Dynamic Partitioning ◽  
Detection Technology

Nowadays, many domestic printing enterprises still rely on artificial visual means to weed out waste, labor-intensive, time-consuming, subjective factors serious influence, the test results not being uniform, especially with the improvement of printing speed, gradually unable to meet the needs of the production. In order to solve the problems in the conventional assay and promote the development of China's printing industry productivity, there is an urgent need to develop the quality of printing online full screen detection system, with the rapid development of modern printing technology, the objective is to test and evaluate. In this paper, machine vision inspection technology, digital image processing technology is used in order to achieve the online testing and feedback of print quality. Dynamic partitioning method is based on standard proofs and proofs of defective segmentation and matching. According to the type of image resolution and the desired accuracy of detecting the type of design image segmentation method, thereby performing the detection and analysis of the color information. Secondary identification defect classification technology is used to change the defect classification, and then display the corresponding defect types. Compared with the traditional printing quality, the high detection print quality inspection speed and precision requirements have been reached, thereby the overall quality of the printed product is improved.

Pad printing of polymeric silver ink conductors on thermoplastic foils

Circuit World ◽  
2016 ◽  
Vol 42 (4) ◽  
pp. 170-177 ◽  
Author(s):  
Teija Laine-Ma ◽  
Pekka Ruuskanen ◽  
Satu Pasanen ◽  
Mikko Karttunen
Keyword(s):  
Curing Temperature ◽  
Print Quality ◽  
Content Type ◽  
Factors Affecting ◽  
Silver Ink ◽  
Excellent Adhesion ◽  
Pet Film ◽  
Electrical Conductors ◽  
Printing Parameters

Purpose The aim of this study was to evaluate the feasibility of pad printing for producing electrical conductors and to define the factors affecting the print quality of polymeric silver ink conductors. Design/methodology/approach Polyethylene terephthalate (PET) film and polyphenylene oxide (PPO) compound film were used as substrate materials. Three different polymeric silver inks, marked A, B and C, were used and tested. Findings The results indicated that the important factors in the pad printing of silver ink conductors are the printing parameters and characteristics of the ink, pad, cliché and substrate. The interactions of these factors should be considered on a case-by-case basis. The sheet resistances of triple-pressed ink conductors varied between 20 and 110 mΩ/sq for 5.7- to 8.5-μm-thick conductors. Ink (B) had a higher sheet resistance than Ink (A) because of its lower silver particle content but also because of the shorter curing time and lower curing temperature. Ink (A) showed excellent adhesion on PET, and Ink (B) had moderate adhesion on PET without corona or plasma pre-treatments, but both inks adhered weakly on PPO compound. Both corona and plasma treatments raised adhesion of these two inks on all test substrates to the highest classification value, 5B. Originality/value This paper contains a survey and preliminary testing of the pad printing of polymeric silver ink conductors on flexible thermoplastic foils. Finally, the paper introduces the advantages and drawbacks of the technique.

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