Development of a multi-nozzle drop-on-demand system for multi-material dispensing

Li, Linhu; Saedan, Mana; Feng, Wei; Fuh, Jerry Ying Hsi; Wong, Yoke San; Loh, Han Tong; Thian, S. C. H.; Thoroddsen, Sigurður T.; Lü, Lin

doi:10.1016/j.jmatprotec.2008.10.040

Cited by 34 publications

(10 citation statements)

References 8 publications

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“…The Fused Deposition Modelling (FDM) system has been extended with additional nozzles, each depositing a specific material [11], for fabrication of ceramic and biomedical objects [8] [9]. Besides these extrusion-based ones, some MMLM systems based on local laser-sintering have also been developed to fabricate parts with functionally graded materials, in which a laser was focused onto a substrate to create a melt pool, and metal powder was injected into the melt pool to increase the material volume [12] [14].…”

Section: Multi-materials Layered Manufacturingmentioning

confidence: 99%

A Toolpath Design Platform for Multi-material Layered Manufacturing

Choi¹,

Cai²

2011

Computer-Aided Design and Applications

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Toolpath planning is vital to multi-material layered manufacturing (MMLM), particularly for improvements in fabrication efficiency and quality of prototypes. This paper proposes a toolpath design platform (TDP) for planning and validation of toolpaths in MMLM. The TDP consists of three constraint modelling modules to represent common operational and mechanical constraints of an MMLM process, and subsequently generate feasible and efficient toolpaths for digital fabrication of multimaterial prototypes in a built-in virtual prototyping (VP) module. The material deposition speeds and priorities can also be adjusted to suit various material properties and optimize the toolpaths. Simulations show that the TDP is an effective tool to model and simulate MMLM processes, and accordingly generate practicable toolpath strategies for different application requirements.

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Section: Multi-materials Layered Manufacturingmentioning

confidence: 99%

A Toolpath Design Platform for Multi-material Layered Manufacturing

Choi¹,

Cai²

2011

Computer-Aided Design and Applications

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“…The processing provides systematic deposition of successive material layers by an automated system based on a premade computer model [14]. Printing enables the freedom of working with variegated material combinations, deposition of complex profiles, control of close-range features of the profiles, and decreased material wastage [15][16][17][18]. Additive manufacturing techniques like fused deposition modeling, powder bed printing, selective heat/laser sintering, and robocasting, among others, are typically employed for depositing composites [19].…”

Section: Introductionmentioning

confidence: 99%

Thermal and Combustion Properties of Energetic Thin Films with Carbon Nanotubes

Smith

Cano

Pantoya

et al. 2017

Journal of Thermophysics and Heat Transfer

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The effect of varying carbon nanotube concentration on ignition delay, flame speed, and electrical and thermal conductivity of three-dimensional printable energetic thin films made of magnesium and manganese oxide was investigated. Polyvinylidene fluoride was used as the binder for depositing the stoichiometric Mg∕MnO 2 mixture into thin films with an average thickness of 200 μm using an extrusion-based blade-casting method. Four films with a 0, 0.5, 1.0, and 1.5 wt % carbon nanotube were prepared. The ignition delay and flame speed of the films were measured using high-speed imaging techniques. Electrical and thermal conductivities were also measured. Results show that the inclusion of a 1.5 wt % carbon nanotube in the Mg∕MnO 2 /polyvinylidene fluoride films improved their flame speed by 440% and electrical conductance by two orders of magnitude (from 4.23 to 655.33 nS) and decreased ignition delay by 87.2%. Interconnectivity of carbon nanotubes in the films was estimated using a basic percolation model. Films with a 1.5 wt % carbon nanotube demonstrated the highest interconnectivity, which aided improved thermal and electrical energy transport, thereby improving combustion performance. The development of three-dimensional extruded thin films with tailorable thermal and combustion parameters is a precursor for the additive manufacturing of energetic materials.

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“…DOD consists of an actuation system, a feedstock with ink and nozzles. The system can expel different substances besides ink, in 2‐D or 3‐D arrangements (Fuller and Jacobson, 2002; Li et al , 2009). Inkjet technology has been used to manufacture MEMS (Fuller and Jacobson, 2002), organic conducting films (Natori et al , 2003), ceramic compounds (Özkol et al , 2009), polymer silver conductors (Wu et al , 2008), electrochemical organic electronics (Mannerbro et al , 2008), antennas and printed circuits (Bidoki et al , 2007).…”

Section: Introductionmentioning

confidence: 99%

“…This method is flexible enough to work with thermal or piezo‐driven DOD. It can eject both micro and nanoparticles while with standard methods in Özkol et al (2009), Li et al (2009) and Magdassi et al (2009) only nanometer range ejection is possible.…”

Section: Introductionmentioning

confidence: 99%

Iron microparticle deposition at high concentration

Isaza

Ávila

2012

Rapid Prototyping Journal

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PurposeDeposition of ink containing metal particles is possible using inkjet technologies. The purpose of this paper is to show a novel method for deposition of iron microparticles, with an average diameter of 1.24 μm, on a glass substrate that can potentially achieve concentrations of 0.21 per cent or higher.Design/methodology/approachThe method combines drop‐on‐demand (DOD) technology with a creative way of positioning iron microparticles near to the nozzle's print head. The use of ferromagnetic particles allows the control of particle dispersion on the target sample surface. The particles are positioned close to the nozzle using a sharpened steel rod as holder and their alignment is controlled by generating an external magnetic field along the sharpened steel rod.FindingsSuccessful deposition of iron microparticles with a potential concentration of 0.21 per cent or higher is reported.Research limitations/implicationsThe implemented method is restricted to ferromagnetic particles or alloys of ferromagnetic and non‐ferromagnetic materials.Practical implicationsThe method described could be integrated to control the deposition of iron microparticles in the production of optoelectronic devices and biosensors. This method speeds up the deposition process due to the higher metal microparticle concentrations achieved.Originality/valueThe deposition method introduced in the paper reached concentrations of 0.084 per cent, similar to the highest concentrations (0.1 per cent) reported with conventional methods (inkjet inks containing metal nanoparticles). It also prevents the blocking of the print head nozzles, thus improving the efficiency of Fe particle deposition.

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Development of a multi-nozzle drop-on-demand system for multi-material dispensing

Cited by 34 publications

References 8 publications

A Toolpath Design Platform for Multi-material Layered Manufacturing

A Toolpath Design Platform for Multi-material Layered Manufacturing

Thermal and Combustion Properties of Energetic Thin Films with Carbon Nanotubes

Iron microparticle deposition at high concentration

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