Application of the product related stress model for product dispersity control in dry stirred media milling

Rácz, Ádám; Csõke, Barnabás

doi:10.1016/j.minpro.2016.09.005

Cited by 21 publications

(14 citation statements)

References 14 publications

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“…In the principles, the constants, i.e., Bond's (work index), Kick's, and Rittinger's constants, are determined based on the initial and final particle sizes of the material. The Equations (7)- (10) are used for the evaluation of energy and grinding constants:…”

Section: Energy Consumptionmentioning

confidence: 99%

“…Based on this, models such as the stress model, Rettingger's law and Bond's law were developed. These are aimed at estimating the required energy needed for size reduction and consequently features grinding parameters such as friction, adhesion to grinder, particle size, and grinder size for the stress model, while Rettinger's and Bond's law features the initial and final particle sizes [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The amount of moisture content before grinding is an important factor because it helps determine the materials' physical properties and powder properties. Many researchers have investigated the efficiency of the grinding process as applied to grains and other food materials with various moisture contents [10][11][12]. Similarly, the resulting dried product from the drying operation can also affect the physical, textural, sensory, and functional properties of the powder resulting from the modification of the rheological and structural properties of the sample to be ground [12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Freeze-Drying on Quality and Grinding Process of Food Produce: A Review

2020

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Freeze-drying is an important processing unit operation in food powder production. It offers dehydrated products with extended shelf life and high quality. Unfortunately, food quality attributes and grinding characteristics are affected significantly during the drying process due to the glass transition temperature (during drying operation) and stress generated (during grinding operation) in the food structure. However, it has been successfully applied to several biological materials ranging from animal products to plants products owning to its specific advantages. Recently, the market demands for freeze-dried and ground food products such as spices, vegetables, and fruits are on the increase. In this study, the effect of the freeze-drying process on quality attributes, such as structural changes, the influence of glass transition during grinding, together with the effect on grinding efficiency in terms of energy requirement, grinding yield, and morphological changes in the powder as a result of temperature, drying time were discussed. An overview of models for drying kinetics for freeze-dried food sample, and grinding characteristics developed to optimize the drying processes, and a prediction of the grinding characteristics are also provided. Some limitations of the drying process during grinding are also discussed together with innovative methods to improve the drying and grinding processes.

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Section: Energy Consumptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Freeze-Drying on Quality and Grinding Process of Food Produce: A Review

2020

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“…Another important factor in relation to the product [5][6] is location. The location of the attraction is very important to its prospects of success in three main ways.…”

Section: The Productmentioning

confidence: 99%

The Research on Factors Influencing the Success of Visitor Attractions

Xu¹

2017

dteees

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Abstract. Every year thousands of individuals and organizations think about developing new visitor attractions. Only a minority of these proposed attractions will ever be built. Most will never be developed for a number of reasons, including funding problems, unfavorable feasibility studies or the lack of a suitable site. Furthermore, many new attractions never take off and either close prematurely or merely survive from year to year. Others achieve early success and then decline due to a lack of investment, visitor management problems or the failure to respond to changes in market demand. Only relatively few attractions achieve constant success over a long period of time. Experience suggests that while nothing guarantees success, there are a number of factors which contribute to the success of visitor attractions. The organization and its resourcesThe chances of developing a successful new visitor attraction are greatly enhanced if the organization has experience of developing and managing attractions [1][2][3][4]. It will be aware of the opportunities and pitfalls, and will be able to take account of the lessons it has learned from its previous experience. However, the early years of Disneyland Paris show that even experienced, successful attraction operators can make some errors of judgment. An organization with previous experience will also probably have a human resource team that will have the skills and knowledge to develop a new attraction successfully. The most important type of resource, however, and the one which is crucial to successful attraction development, is financial resources. Visitor attractions are very expensive to build and run, and those that are successful tend to be developed by organizations with substantial financial resources. The capital cost of developing attractions varies from less than £1 million for a craft cent re or small museum to several billion pounds for a project such as Disneyland Paris. Indeed Disneyland Paris is, together with the Channel Tunnel, probably the largest and most expensive construction project of the age in Europe, and perhaps in the world. As well as the cost of site acquisition and building work, much of the cost comes from fitting out the attraction with expensive museum artifacts or the installation of sophisticated modern technology like lasers and virtual reality experiences. Well-used attractions and those in rapidly changing markets (most of them) also need regular refurbishment, relaunching and remodeling to encourage repeat visits and to keep up with changes in consumer tastes. This is a continuous process that requires investment at frequent intervals. For example, theme parks often believe they need to offer a major new ride every year and these rides often cost over £1 million each.Attractions also need the financial resources to allow them to provide high-quality facilities and services. Organizations which are short of money often reduce levels of facilities and services and this often leads to a poorer product and, ultimately, fewer visitor...

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“…It can be used also for the enhancement of mass transfer in bio-and chemical processes and ultrafine liberation of semiconductors from glass substrate [14]. These mills can be used in dry [15] or wet [16][17][18][19][20] mode.…”

Section: Introductionmentioning

confidence: 99%

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

Bohács¹,

Faitli²,

Bokányi³

et al. 2017

Archives of Metallurgy and Materials

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Due to the special characteristics of zeolites, they can be applied in a very wide range of industries, i.e. agricultural, environmental or water treatment purposes. Generally, high added value zeolite products are manufactured by micro-or nanogrinding. However, these processes require high energy input and cause significant wearing of the mill parts. Therefore, the optimization of zeolite grinding, as well as the control of its properties are of a great importance. In the present paper a Hungarian natural zeolite was mechanically activated in stirred media mill for various residence times in distilled water, meanwhile the particle size distribution and the grinding energy were measured. Additionally, on-line tube rheometer was used to study the rheology of the suspension during the grinding process. The particle interaction and the suspension aggregation stability were detected by zeta-potential measurements. Structural changes due to the mechanical activation process were monitored by FTIR. It was found that the material structure of the zeolite, as well as the rheological behaviour of the zeolite suspension and its aggregation stability had been altered due to the mechanical activation in the stirred media mill. It can be concluded that the zeolite product properties can be modified by mechanical activation in order to produce a high added value tailored material.

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Application of the product related stress model for product dispersity control in dry stirred media milling

Cited by 21 publications

References 14 publications

Effect of Freeze-Drying on Quality and Grinding Process of Food Produce: A Review

Effect of Freeze-Drying on Quality and Grinding Process of Food Produce: A Review

The Research on Factors Influencing the Success of Visitor Attractions

Control of Natural Zeolite Properties by Mechanical Activation in Stirred Media Mill

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