Some Knowledge about test sieve
Datetime:2016-07-26 Hits:
Some Knowledge about test sieve
A simplistic definition of sieving is the separation of fine material from coarse material by means of a meshed or perforated vessel. Professor Terence Allen characterizes sieving as"The aperture of a sieve may be regarded as a series of gauges which reject or pass particles as they are presented to the aperture."
The level of sophistication increased with the rise of the industrial revolution and the need for more sophisticated methods for classifying material by their particle size. As requirements for sized material rose, technology in producing uniform sieving media increased. Woven wire cloth was introduced as an alternative, providing greater accuracy and durability. At present, this woven cloth is available in a range of sizes from 125 mm (5") openings to 20 micrometer openings. All mesh sizes are covered by of both national and international standards.
The need for particle size analysis in the finer size ranges (i.e. 38 micrometers and less) prompted the development of the electrodeposited sieve. These sieves, sometimes called electroformed or micromesh, are currently being produced with openings as fine as 3 micrometers.
The mesh openings are extremely uniform in both size and shape and maintain exacting tolerances. While the technology related to sieve analysis has come a long way since the reed sieves of ancient Egypt, few new developments have come along since the 1940's. Professor Kurt Leschonski wrote "Sieve analysis is one of the few methods of particle size analysis which has escaped modernization." While the modernization has not come in the actual hardware of sieving, refinements in the application and utilization of existing equipment has proceeded.
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