Simulation of ball behavior in a vibration mill in relation with its grinding rate: effects of fractional ball filling and liquid viscosity

Yokoyama, Toyokazu; Tamura, Kishio; Usui, H; Jimbo, Genji

doi:10.1016/0301-7516(95)00048-8

Cited by 15 publications

(13 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Another possible explanation is that the increased viscosity associated with increasing polymer concentration reduces the forces of impaction in the mill, via a cushioning effect, resulting in a less efficient size reduction (Denison, 1990;Parrott, 1974). This hypothesis is in agreement with simulations of the motion of balls in a vibration mill performed by Yokoyama et al (1996) in which an increase in the viscosity of the surrounding medium cased a radical drop in the intensity of ball collisions. Indeed, it is not possible to mill using high concentrations of polymer due to high viscosity of the system.…”

Section: Nabumetone Nanoparticle Stabilitysupporting

confidence: 90%

Production of nabumetone nanoparticles: Effect of molecular weight, concentration and nature of cellulose ether stabiliser

Goodwin

Martini

Lawrence

2016

International Journal of Pharmaceutics

View full text Add to dashboard Cite

The ability of a range of hydrophilic nonionic cellulose ethers (CEs) (namely methylhydroxethylcellulose, hydroxypropylmethylcellulose, ethylhydroxyethylcellulose, hydroxyethylcellulose and hydroxypropylcellulose) to prepare stable nabumetone nanoparticles (<1000nm, as measured by laser diffraction) using wet-bead milling has been investigated. Due to the limited range of CE molecular weights commercially available, the CEs were degraded using ultrasonication for varying lengths of time to yield CEs of lower molecular weight. Of the CEs tested, only hydroxyethylcellulose was found not to stabilise the production of nabumetone nanoparticles at any of the molecular weights tested, namely viscosity average molecular weights (M) in the range of 236-33kg/mol. All other CEs successfully stabilised nabumetone nanoparticles, with the lower molecular weight/viscosity polymers within a series being more likely to result in nanoparticle production than their higher molecular weight counterparts. Unfortunately due to the nature of the ultrasonication process, it was not possible to compare the size of nabumetone particles produced using polymers of identical M. There was, however, enough similarity in the M of the various polymers to draw the general conclusion that there was no strong correlation between the M of the various polymers and their ability to produce nanoparticles. For example hydroxypropylcellulose of 112.2kg/mol or less successfully produced nanoparticles while only ethylhydroxyethylcellulose and hydroxypropylmethyl polymers of 52 and 38.8kg/mol or less produced nanoparticles. These results suggest that polymer molecular weight is not the only determinant of nanoparticle production and that structure of the polymer is at least as important as its molecular weight. In particular the hydrophobic nature of the CE was thought to be an important factor in the production of nabumetone nanoparticles: the more hydrophobic the polymer, the stronger its interaction with nabumetone and the greater its ability to produce nanoparticles. In this context HPC was the most hydrophobic polymer and HEC the least hydrophobic.

show abstract

Section: Nabumetone Nanoparticle Stabilitysupporting

confidence: 90%

Production of nabumetone nanoparticles: Effect of molecular weight, concentration and nature of cellulose ether stabiliser

Goodwin

Martini

Lawrence

2016

International Journal of Pharmaceutics

View full text Add to dashboard Cite

show abstract

“…The schematic representation of the speeds of the grinders and the chamber before and after collision requires the determination of complex motion equations, which take into account various coefficients (elasticity, restitution, damping, friction, and other material parameters) as well as the most challenging, the dissipation of energy during the grinding process. Equations of this type, describing the behavior of the grinders in the mill chamber or computer simulations, have been the subject of other research studies [ 1 , 43 , 44 , 45 ]. A set of grinding media typically comprises balls of uniform dimensions.…”

Section: Comminution In Vibratory Mills With Free-flowing Grinding Me...mentioning

confidence: 99%

“…Various disintegration models were used to describe the process of grinding material grains between grinding media [ 45 , 47 ]. We can distinguish here, for example, the models by Schönert [ 48 ] and two models by Yokoyama et al [ 46 ].…”

Section: Comminution In Vibratory Mills With Free-flowing Grinding Me...mentioning

confidence: 99%

The Influence of the Grinding Media Diameter on Grinding Efficiency in a Vibratory Ball Mill

Tomach

2024

Materials

View full text Add to dashboard Cite

The grinding process plays a crucial role in industry, allowing for the reduction of particle sizes of raw materials and substances to the required fineness—either as a finished product or for further technological processes. The high demand for micro- and nanopowders or suspensions is associated with the high energy consumption of the milling process. Therefore, optimizing the milling process, including correctly selecting grinding media, is essential to reduce energy consumption. This article presents experimental studies of the grinding process of a model material (quartz sand) in a laboratory vibratory mill. Five sets of grinding media with different diameters were used in the research, and grinding was conducted for various durations. The studies showed that the vibratory grinding process is efficient for each set of grinding media and grinding durations. The research has shown that conducting studies on the proper selection of mills is beneficial, especially regarding very fine grinding of various materials. The study confirmed that properly selecting grinding media sets can significantly accelerate the grinding process. For the selected technological variant, it was demonstrated that using 15 mm grinding media, compared to 12 mm, resulted in a 22.5% reduction in grinding time to achieve a specified particle size class of 0–10 μm.

show abstract

“…As the motor thrust and the relative motion of the rubbing mill-balls produce shears high enough to overcome the inter-agglomerate bonding upon milling, de-agglomeration occurs and this dispenses the thick liquid slurry into a low viscous one [8,9]. Among the process variables involved in the milling process, factors such as material and size/shape of the grinding medium, milling time and filling ratio of grinding balls with respect to the overall powder loading and mill-pot volume have all been shown critical to the milling efficacy and the milled particle-size distribution [1,[10][11][12]. Contaminations arising from the milling operation also become a concern particularly for long-time milling.…”

Section: Introductionmentioning

confidence: 99%

Surfactant-assisted de-agglomeration of graphite nanoparticles by wet ball mixing

Chen

Tseng

2007

Journal of Materials Processing Technology

View full text Add to dashboard Cite

Simulation of ball behavior in a vibration mill in relation with its grinding rate: effects of fractional ball filling and liquid viscosity

Cited by 15 publications

References 4 publications

Production of nabumetone nanoparticles: Effect of molecular weight, concentration and nature of cellulose ether stabiliser

Production of nabumetone nanoparticles: Effect of molecular weight, concentration and nature of cellulose ether stabiliser

The Influence of the Grinding Media Diameter on Grinding Efficiency in a Vibratory Ball Mill

Surfactant-assisted de-agglomeration of graphite nanoparticles by wet ball mixing

Contact Info

Product

Resources

About