Nozzle dispensing additive manufacturing of polysiloxane: dimensional control

Liravi, Farzad; Darleux, Robin; Toyserkani, Ehsan

doi:10.1504/ijrapidm.2015.073546

Cited by 18 publications

(7 citation statements)

References 21 publications

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“…[29] Liquid rubber silicone inks based on thermal curing or UV hydrosilylation curing methods have been proposed due to their low cost and simple processing. [30,31] DIW material extrusion is currently the most common method for silicone printing, since the nozzle dispensing method can meet the deposition requirement of a wide range of fluids, ranging from low viscosity liquids to highly viscous pastes. [32,33] A variety of pneumatic pressure-actuated and mechanical systems are available for dispensing fluids for material extrusion.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The curing process has also been investigated for the feasibility of extruding and curing strands of silicone with lower viscosities. [31] These factors can also alleviate some of the technical issues often encountered, such as nozzle clogging and silicone stream deflection among the layers. [36] Creating objects with varying characteristics by using more than one material or reinforcing the silicone structures is a weakness that the 3D-printing of silicones aims to overcome.…”

Section: Introductionmentioning

confidence: 99%

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Additive manufacturing of silicone composite structures with continuous carbon fiber reinforcement

Liu

Peeke

Periyasamy³

et al. 2023

Polymer Engineering & Sci

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As a relatively new material deployed in additive manufacturing (AM), silicone and its composites have the potential to realize tunable functionality and heterogeneous, architected properties for a number of applications requiring low modulus, elastic materials. Continuous fiber reinforced composites have been developed for AM to achieve various complex structures that are lightweight with high mechanical properties. AM of silicone-based composites with direct ink writing (DIW) technology has potential application in medical devices, gasket components, flexible soft electronics, and food packaging. However, DIW printed materials have mechanical anisotropy since the extrusion-based printing process creates small changes in geometry during the material deposition process. In addition, silicone elastomers are relatively low modulus in tension and can be reinforced with woven cloth or fibers. In this work, a continuous fiber AM machine is developed to manufacture silicone composite structures with continuous fiber reinforcing the printed silicone. Tensile tests show that the anisotropic property of the perpendicular printed specimens, relative to the tension direction, has been significantly improved by continuous carbon fiber reinforcements. This continuous fiber silicone reinforcement printing technique can be applied to tune fiber volume ratios and orientations for different silicone composite structures to meet the desired strength and stiffness.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Additive manufacturing of silicone composite structures with continuous carbon fiber reinforcement

Liu

Peeke

Periyasamy³

et al. 2023

Polymer Engineering & Sci

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show abstract

“…Kumar et al (2013) investigated the effect of the pulse on time, pulse off time, peak current, spark gap voltage, wire feed and wire tension WEDM process during machining pure titanium (grade-2) and developed regression models after performing experiments using the Box-Behnken design of RSM. Design of experiments is also widely used to understand the effect of process parameters (Liravi et al, 2015).…”

Section: Literature Review and Problem Identificationsmentioning

confidence: 99%

A study on machinability evaluation of Al-Gr-B<SUB align="right">4C MMC using response surface methodology-based desirability analysis and artificial neural network technique

Ponnuvel¹,

Senthilkumar²

2019

IJRAPIDM

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In this work, machinability behaviour of aluminium-graphite-boron carbide metal matrix composite is performed during wire-cut electrical discharge machining (WEDM) process. Experiments were designed using central composite-face centred design of response surface methodology (RSM) and with the application of desirability function multiple quality characteristics viz., kerf width, surface roughness and material removal rate (MRR) were optimised simultaneously. Input parameters gap voltage, pulse ON-time, pulse OFF-time and % reinforcement of boron carbide particles in the aluminium matrix are considered. The optimised machining condition obtained is a gap voltage of 150 V, pulse ON-time of 124.56 ms, pulse OFF-time of 48.03 ms and 2.5% reinforcement of boron carbide. From the experimental values, it is observed that better output responses are achieved with lower reinforcement of boron carbide. Second order regression models are developed individually for the output responses. An artificial neural network model is developed to predict the output responses, results obtained show that a better prediction can be achieved through artificial intelligent technique.

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“…They diluted commercially available silicones and jetted the individual components (thermally cured) or the mixed components (UV cured) using a piezoelectric print head. Liravi et al (2015, 2017) modeled droplet behavior of an room temperature vulcanising silicone with a dynamic viscosity of 19.9 Pa- s (at 10 s −1 ) and measured the dispensing geometrical parameters as a function of tool velocity, working distance and dispense pressure. Hinton et al (2016) successfully printed polydimethylsiloxane (PDMS) inside of a carbopol gel that was weakened after soaking in a phosphate-buffered saline solution.…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing by material extrusion with medical grade silicone elastomers and IR laser curing

Porter¹,

Davis

Krueger

et al. 2020

RPJ

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Purpose Techniques of extrude and cure additive manufacturing for thermally cured, high viscosity and medical-grade silicone are investigated by using a small ram extruder and a near-infrared (IR) laser. The purpose of this study is to evaluate the process parameter effects on the stiffness of the final products. Design/methodology/approach Process parameter effects on axial stiffness values and durometer are explored. Parameters such as extrusion layer height, laser speed, laser current, laser raster spacing and multiple laser passes were investigated and compared to traditional cast and cure methods. Dimensional changes were also recorded and compared. Findings Tensile and durometer tests show that certain curing parameters give tensile stress and durometers within 10 per cent of bulk material specifications at 200 per cent strain. Parameters that had the highest impact on tensile stress at 200 per cent strain were layer height (0.73 per cent) followed by laser power (0.69 per cent), and then laser raster spacing (0.45 per cent). Parameters that had the highest impact on durometer were laser power (1.00 per cent), followed by layer height, (0.34 per cent) and then laser raster speed (0.32 per cent). Three-dimensional printed samples had about 11.2 per cent more shrinkage than the bulk cast samples in the longest dimension. Originality/value This paper is one of the first that demonstrates near IR laser curing parameter effects on three-dimensional printed, commercial off-the-shelf, medical-grade and viscous silicone. The ability to cure very viscous thermosets locally enables interesting technologies such as wire encapsulation, high voltage actuators and drug delivery devices.

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Nozzle dispensing additive manufacturing of polysiloxane: dimensional control

Cited by 18 publications

References 21 publications

Additive manufacturing of silicone composite structures with continuous carbon fiber reinforcement

Additive manufacturing of silicone composite structures with continuous carbon fiber reinforcement

A study on machinability evaluation of Al-Gr-B<SUB align="right">4C MMC using response surface methodology-based desirability analysis and artificial neural network technique

Additive manufacturing by material extrusion with medical grade silicone elastomers and IR laser curing

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