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Difference between revisions of "Sieving"
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|Name= Sieving}} | |Name= Sieving}} | ||
<onlyinclude>'''Sieving''' is a simple technique for separating particles of different sizes. | <onlyinclude>'''Sieving''' is a simple technique for separating particles of different sizes. Sieving has been around since the time of the ancient Egyptians and can be considered the backbone of particle size technology. Sieving’s continuing popularity is due to the technique’s fundamentally simple principle and methodology, historical reference, and cost effectiveness. Several instrument components involved in a sieve analysis can be quality controlled, making the technique applicable to various industries including pharmaceutical, industrial, agricultural, and chemical. In food industries sieves (often vibrating) are used to prevent the contamination of the product by foreign bodies | ||
The main method is separation of product(s) into different fractions according to the particle size. Particles with a size bigger than the mesh of the used sieve will be withheld and smaller particles will fall through. | |||
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==Feedstock== | ==Feedstock== | ||
=== Origin and composition === | === Origin and composition === | ||
The sieving method is used to separate different components from a solid mixture via separating particles of different sizes. The feedstock composition | The sieving method is used to separate different components from a solid mixture via separating particles of different sizes. The feedstock composition therefore is a mixture of materials of different particle size e.g. coming from a [[sizing]] pro-treatment or a [[drying|drying process]]. | ||
=== Pre-treatment === | === Pre-treatment === | ||
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==Process and technologies== | ==Process and technologies== | ||
[[File:Sieving.png|thumb|Sieving process]] | [[File:Sieving.png|thumb|Sieving process]] | ||
A '''sieve analysis''' (or '''gradation test''') is a practice to assess the particle size distribution (also called ''gradation'') of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction of the whole mass. | While sieving may appear rudimentary compared to more modern instrumental particle sizing techniques, it still requires several important considerations to obtain the best repeatable and precise results. Several factors must be considered when developing a robust sieving method or performing a routine quality analysis. Sample size, sieving duration, controlled agitation parameters and end point determination are all critical method variables which need to be addressed. | ||
=== Sieve analysis === | |||
[[File:Sieving method.png|thumb|Sieving analysis]] | |||
A '''sieve analysis''' (or '''gradation test''') is a practice to assess the particle size distribution (also called ''gradation'') of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction of the whole mass. | |||
Several mechanisms are used to disperse the sample and transport it through the screens (i.e. vibration, air entrainment or flowing liquid). While considered relatively low resolution, sieving’s practical applications lend itself well to quality control specifications. | |||
==Products== | ==Products== | ||
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==References== | ==References== | ||
* [[:en:Sieving| Sieving]] in Wikipedia | * [[:en:Sieving| Sieving]] in Wikipedia | ||
*[https://www.particletechlabs.com/analytical-testing/particle-size-distribution-analyses/sieve-analysis#:~:text=Sieving%20has%20been%20around%20since,backbone%20of%20particle%20size%20technology.&text=A%20sieve%20analysis%20consists%20of,separate%20or%20classify%20a%20sample. Sieve analysis] | |||
[[Category:Hybrid processing]] | [[Category:Hybrid processing]] | ||
[[Category:Separation]] | [[Category:Separation]] | ||