An experimental study on free-surface rolling segregation and correlations with angle of repose and particle sphericity

Deng, Tong; Garg, Vivek; Salehi, Hamid; Bradley, M.S.A.

doi:10.1016/j.powtec.2020.10.077

Cited by 14 publications

(4 citation statements)

References 22 publications

(33 reference statements)

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“…The sphericity indicates how close the particles are to a sphere and is also a widely used particle shape parameter, which describes the shape difference between spherical and nonspherical particles. There are many formulas used to define the sphericity 20,21 . Since the volume and surface area of the particle model are easily obtained in postprocessing of the 3D scanning model, the sphericity degree is shown in Eq.…”

Section: B B Tmentioning

confidence: 99%

The shape parameters of coal and gangue particles derived from 3D scanning

Yang

Tang

et al. 2023

Sci Data

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The irregular shape of mineral particles directly affects the angle of repose, bulk density and flow-properties, and the interaction behaviour between the particles and a contact surface. This paper presents a dataset of spatial data and shape parameters collected from 37 gangue particles and 135 anthracite coal particles, which come from the Shangzhuang Coal Mine. The particle surface models were obtained by a Wiiboox white light raster 3D scanner and Reeyee software. To obtain the scanning surface, each particle was scanned 8 times in different axial rotation directions. The final scanning model was obtained by stacking two scanning surfaces, and the shape parameters, such as length ratio, flatness ratio, and Zingg index, were obtained. This dataset is particularly useful for researchers and engineers who want to investigate the shape of coal and gangue particles or who want to test or benchmark measurement methods concerning the three-dimensional morphology of particles.

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Section: B B Tmentioning

confidence: 99%

The shape parameters of coal and gangue particles derived from 3D scanning

Yang

Tang

et al. 2023

Sci Data

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“…The low-level size and shape segregation across the build plate raised the topic of how the tested two-metal powders segregate during transportation. This problem can be further investigated using the QPM rolling segregation tester [30].…”

Section: Particle Size and Shape Segregation In The Powder Bedmentioning

confidence: 99%

Optimising Spread-Layer Quality in Powder Additive Manufacturing: Assessing Packing Fraction and Segregation Tendency

Salehi

Cummins

Gallino³

et al. 2023

Processes

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Powder bed fusion (PBF), a subset of additive manufacturing methods, is well known for its promise in the production of fully functional artefacts with high densities. The quality of the powder bed, commonly referred to as powder spreading, is a crucial determinant of the final quality of the produced artefact in the PBF process. Therefore, it is critical that we examine the factors that impact the powder spreading, notably the powder bed quality. This study utilised a newly developed testing apparatus, designed specifically for examining the quality of powder beds. The objective was to analyse the influence of various factors, including the recoater shape, recoater gap size, and the different powder flow properties, on the powder bed relative packing fraction. Additionally, the study aimed to assess the variation in the particle size and shape across the build plate. The results indicated that all of the variables examined had an impact on the relative packing fraction, as well as the size and shape variations observed across the build plate.

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“…The tester has served to find positive correlations between rolling segregation index and blend properties calculated by dividing the particle size ratio by the bond number (which in turn is defined as the ratio of a particle's adhesion force to its gravity). It has also helped to establish that spherical particles have more of a propensity for surface segregation than angular ones [14,31].…”

Section: Segregation Testingmentioning

confidence: 99%

Blend Segregation in Tablets Manufacturing and Its Effect on Drug Content Uniformity—A Review

Jakubowska

Ciepluch

2021

Pharmaceutics

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Content uniformity (CU) of the active pharmaceutical ingredient is a critical quality attribute of tablets as a dosage form, ensuring reproducible drug potency. Failure to meet the accepted uniformity in the final product may be caused either by suboptimal mixing and insufficient initial blend homogeneity, or may result from further particle segregation during storage, transfer or the compression process itself. This review presents the most relevant powder segregation mechanisms in tablet manufacturing and summarizes the currently available, up-to-date research on segregation and uniformity loss at the various stages of production process—the blend transfer from the bulk container to the tablet press, filling and discharge from the feeding hopper, as well as die filling. Formulation and processing factors affecting the occurrence of segregation and tablets’ CU are reviewed and recommendations for minimizing the risk of content uniformity failure in tablets are considered herein, including the perspective of continuous manufacturing.

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An experimental study on free-surface rolling segregation and correlations with angle of repose and particle sphericity

Cited by 14 publications

References 22 publications

The shape parameters of coal and gangue particles derived from 3D scanning

The shape parameters of coal and gangue particles derived from 3D scanning

Optimising Spread-Layer Quality in Powder Additive Manufacturing: Assessing Packing Fraction and Segregation Tendency

Blend Segregation in Tablets Manufacturing and Its Effect on Drug Content Uniformity—A Review

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