damage the sieve openings on the finer
mesh sieves. The concentrated jet of air
can cause severe 'local' damage to the wire
cloth, and significantly reduce the accuracy
of the sieve mesh.
With proper care, sieves will perform
accurately for many years. Typical wear
does not usually change the opening sizes,
but can abrade the 'knuckles' or crimps of
the wire. A sieve with noticeable sagging of
the cloth should be replaced. Fine mesh
sieves that are torn should not be re-
soldered, as the localized heat of the
soldering iron can distort the openings.
Epoxies have been used for repairs, but
tend to block a large percentage of the
openings reducing the opportunity for
particles to pass through the openings in
the allotted agitation time. Epoxies may
become too brittle for the flexing of the
wire cloth and can fracture with use.
Good general laboratory procedures
should be observed with testing sieves as
with any other piece of test equipment.
Testing should be performed with clean,
uncontaminated sieves, especially when
using a sieve for the first time. With proper
care and cleaning coupled with a good
calibration procedure, any test sieve should
provide many years of consistent service.
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