Gradient light video projection-based stereolithography for continuous production of solid objects

Lichade, Ketki M.; Joyee, Erina Baynojir; Pan, Yayue

doi:10.1016/j.jmapro.2021.02.048

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…Figs. 16 and 17 show how two layers of the part were changed by the optimization. The layer considered in Fig.…”

Section: Validation Of the Optimization Methodsmentioning

confidence: 99%

“…Wang et al mapped the power density distribution of their projector and used grayscaling to counteract the effects of uneven distribution in large objects [15]. Lichade et al used grayscale images with continuous printing to improve the surface quality and reduce the porosity of fabricated parts [16]. You et al utilized neural network based machine learning to produce grayscale masks to counteract the effects of light scattering [17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improving the dimensional accuracy of micro parts 3D printed with projection-based continuous vat photopolymerization using a model-based grayscale optimization method

Guven¹,

Çakmakçı²

2022

Additive Manufacturing

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“…Figs. 16 and 17 show how two layers of the part were changed by the optimization. The layer considered in Fig.…”

Section: Validation Of the Optimization Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the dimensional accuracy of micro parts 3D printed with projection-based continuous vat photopolymerization using a model-based grayscale optimization method

Guven¹,

Çakmakçı²

2022

Additive Manufacturing

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“…The height of the Level‐2 cluster of conical features was a function of the exposure time and material properties, described by the Beer–Lambert law as follows: [ 40 ]

\begin{array}{*{20}{c}}{{H_c} = {D_p} * \ln \left( {\frac{t}{{{t_c}}}} \right)}\end{array}

where t c is the critical curing time of liquid resin for initiating the photopolymerization, D p is the penetration depth, and t is the total exposure time. As discussed in Section 2.3, the gradient distribution of microparticles in region 2 enabled formations of microcones surrounding the pattern.…”

Section: Methodsmentioning

confidence: 99%

“…The height of the Level-2 cluster of conical features was a function of the exposure time and material properties, described by the Beer-Lambert law as follows: [40]…”

Section: Investigation Of Curing Characteristicsmentioning

confidence: 99%

Fast and Simple Fabrication of Multimaterial Hierarchical Surfaces Using Acoustic Assembly Photopolymerization (AAP)

Lichade

Pan

2022

Adv Materials Inter

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contributing to many potential uses such as spatial control of fluid, drug delivery, droplet manipulation, water-harvesting, and lab-on-a-chip devices. [3][4][5][6][7][8] Additionally, these surfaces were also found to be beneficial for biomedical applications such as drug screening and tissue engineering, owing to their shorter reaction times and less usage of rare biological samples or reagents.A variety of approaches have been developed for the fabrication of multimaterial and/or hierarchically structured surfaces with wettability contrast, including CNC machining, [5] spray coating, [9,10] wire electrical discharge machining, [11] vapor deposition, [12] lithography, [13] and laser microfabrication. [14,15] Although these techniques have enabled the direct fabrication of surfaces with tunable wetting properties, significant challenges still exist in producing complex 3D surface structures in an eco-friendly fashion. For example, hierarchical surfaces developed by the spray coating method undergo chemical instability after exposure to organic solvents. Machining and laser-based manufacturing processes are limited to single materials such as elastomers or metals. Moreover, the surface structure topology fabricated using a conventional direct fabrication approach is usually limited to one or two levels only.Combining two or more direct fabrication techniques is a common approach to address the aforementioned challenges and achieve higher structural complexities. For instance, Lee et al. [16] prepared microscale groove surface patterns using machining and compression molding, resulting in a superhydrophobic anisotropic surface (CA:150°). Additional dip-coating created nanoscale patterns to induce low sliding angles, enabling liquid transportation. Peng et al. [17] utilized templating and diffusion-controlled bucking to generate a dual-structured hierarchical surface with microsized wrinkles. To enhance the biocompatibility, the surface was chemically modified using dopamine-glycopolymer. Other indirect micro-fabrication methods, including surface wrinkling by thermal annealing, [18] electrochemical etching followed by deposition, [19] and colloidal crystal templating, [20] have been investigated for developing hierarchical surfaces with a high wettability contrast. Nevertheless, it is difficult to precisely control the dimensions of the Multimaterial surfaces with hierarchical features have many potential applications in self-cleaning, droplet manipulation, microfluidics, and biomedicine, owing to their wide range of functionalities induced by structural and material contrasts. Here, a fast and sustainable manufacturing method, acoustic assembly photopolymerization (AAP), is presented for productions of such surfaces. In the novel AAP process, an external acoustic field is used to assemble microparticles to microsized patterns, while the photocuring is combined with the acoustic assembly to produce multilevel hierarchical features, such as cones and wrinkles ranging from nanometer to micrometer. The mechanism unde...

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“…It has been mentioned that the limitation of the CLIP process for large cross-section areas can be solved by using this two-way movement. Further extending, Lichade et al [ 83 ], proposed the gradient light video projection-based stereolithography (GLVP-SL) to reduce the refilling issue by dividing each binary image into three mask images with different grayscale distributions. The resin flow, exposure energy, and curing depth are measured at different grayscales.…”

Section: Photopolymer Resin Refillingmentioning

confidence: 99%

A Review of Critical Issues in High-Speed Vat Photopolymerization

et al. 2023

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Vat photopolymerization (VPP) is an effective additive manufacturing (AM) process known for its high dimensional accuracy and excellent surface finish. It employs vector scanning and mask projection techniques to cure photopolymer resin at a specific wavelength. Among the mask projection methods, digital light processing (DLP) and liquid crystal display (LCD) VPP have gained significant popularity in various industries. To upgrade DLP and LCC VPP into a high-speed process, increasing both the printing speed and projection area in terms of the volumetric print rate is crucial. However, challenges arise, such as the high separation force between the cured part and the interface and a longer resin refilling time. Additionally, the divergence of the light-emitting diode (LED) makes controlling the irradiance homogeneity of large-sized LCD panels difficult, while low transmission rates of near ultraviolet (NUV) impact the processing time of LCD VPP. Furthermore, limitations in light intensity and fixed pixel ratios of digital micromirror devices (DMDs) constrain the increase in the projection area of DLP VPP. This paper identifies these critical issues and provides detailed reviews of available solutions, aiming to guide future research towards developing a more productive and cost-effective high-speed VPP in terms of the high volumetric print rate.

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Gradient light video projection-based stereolithography for continuous production of solid objects

Cited by 11 publications

References 21 publications

Improving the dimensional accuracy of micro parts 3D printed with projection-based continuous vat photopolymerization using a model-based grayscale optimization method

Improving the dimensional accuracy of micro parts 3D printed with projection-based continuous vat photopolymerization using a model-based grayscale optimization method

Fast and Simple Fabrication of Multimaterial Hierarchical Surfaces Using Acoustic Assembly Photopolymerization (AAP)

A Review of Critical Issues in High-Speed Vat Photopolymerization

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