Factors influencing paste extrusion pressure and liquid content of extrudate in freeze-form extrusion fabrication

Liu, Hongjun; Liu, Jia; Leu, Ming-Chuan; Landers, Robert G.; Huang, Tishu

doi:10.1007/s00170-012-4534-0

Cited by 24 publications

(17 citation statements)

References 17 publications

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“…Ferstl et al [148] and Liu et al [140] observed a limiting velocity when obtaining Benbow-Bridgewater parameters for the paste formulations they investigated: below this velocity phase separation occurred. As with CPC, the phase separation caused the paste in the extruder to dewater, increasing the required extrusion pressure.…”

Section: Limitations Of the Benbow-bridgewater Approachmentioning

confidence: 94%

Critical review: Injectability of calcium phosphate pastes and cements

et al. 2017

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Occurrence of phase separation of calcium phosphate pastes and cements during injection limits their full exploitation as a bone substitute in minimally invasive surgical applications. Due to lack of theoretical understanding of the phase separation mechanism(s), optimisation of an injectable CPC that satisfies clinical requirements has proven difficult. However, phase separation of pastes during delivery has been the focus across several research fields. Therefore in addition to a review of methods to reduce phase separation of CPC and the associated constraints, a review of phase separation mechanisms observed during extrusion of other pastes and the theoretical models used to describe these mechanisms is presented. It is anticipated this review will benefit future attempts to develop injectable calcium phosphate based systems.

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Section: Limitations Of the Benbow-bridgewater Approachmentioning

confidence: 94%

Critical review: Injectability of calcium phosphate pastes and cements

et al. 2017

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“…This causes a further consolidation of the paste and the quick rise of both the shaping and the friction components of the extrusion force [18]. The liquid phase migration and the corresponding paste consolidation result to be also dependent on the extrusion velocity and modify substantially the flow typology [18,19]. The effect of the liquid migration can be observed in Fig.…”

Section: Influence Of Solid Loading On the Extrusion Pressurementioning

confidence: 95%

“…When the pressure gradients during the extrusion are large, typically because of high plastic yield stress, liquid phase migration phenomena can occur and the rheological characteristic of the paste can locally change with time [18,19]. If this is the case, the paste inside the barrel is drier than the extruded one.…”

Section: Influence Of Solid Loading On the Extrusion Pressurementioning

confidence: 99%

Novel method for the identification of the maximum solid loading suitable for optimal extrusion of ceramic pastes

Azzolini¹,

Downs²

2014

J Adv Ceram

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Gadolinia-doped ceria ceramic pastes were formulated with different solid loadings and extruded using lab-scale equipment. The force to maintain a constant ram speed of 10 mm/min was recorded. The radial shrinkage after drying was proportional to the solid loading and this allowed the determination of the maximum solid loading by an extrapolation procedure. In order to obtain the apparent viscosity of the pastes, a novel approach based on the analysis of the slope of the extrusion pressure plot versus distance covered by the ram, was formulated for the direct determination of the shear stress upon extrusion. The agreement of the determined maximum solid loading with values calculated by two existing models confirmed that the proposed approach was an alternative and reliable method to identify the upper limit of the solid loading range for the formulation of extrudable ceramic pastes.

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“…This indicates that a row ram force should be used for extrusion process. Liu et al (2013) conducted an experiment to study the influence of ram velocity and paste properties on extrusion process by applying series of ram velocities (2,5,10 and 15 µm/s) and three pastes with difference viscosity. The results were found that the extrusion pressure shown an increasing slowly with high velocities (10 and 15 µm/s) whereas the extrusion pressure shown an increasing rapidly at low velocity (2 and 5 µm/s).…”

Section: Extrusion Mechanismmentioning

confidence: 99%

A Review of Process Parameters That Effect to Extrusion on Demand

Pitayachaval

Baothong

2018

MATEC Web Conf.

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An additive Manufacturing (AM) process has been introduced to fabricate three-dimension objects from liquid polymers and powder particles e.g. polymers and metals, this process has been also applied to fabricate threedimension ceramic objects called paste materials which compose of liquid and solid components. To build additive model, the paste material is extruded via pressure force through the nozzle by using ram extrusion, then the model is constructed layer-by-layer on the table to form designed shape. To improve a capability of extrusion process, the Extrusion On Demand (EOD), that refers to the ability of paste extrusion to regulate start and stop, has been developed to improve an accuracy of material deposition. This paper presents a review of process parameters that effect to extrusion on demand such as ram velocity, Dwell time, paste property and extrusion mechanisms.

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Factors influencing paste extrusion pressure and liquid content of extrudate in freeze-form extrusion fabrication

Cited by 24 publications

References 17 publications

Critical review: Injectability of calcium phosphate pastes and cements

Critical review: Injectability of calcium phosphate pastes and cements

Novel method for the identification of the maximum solid loading suitable for optimal extrusion of ceramic pastes

A Review of Process Parameters That Effect to Extrusion on Demand

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