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Recycling - Engineering in Recycling -
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Crumb Rubber
Glossary of Terms
Inch - 1/36th of a yard, 25.4 millimeters
Millimeter - 1/1000th of a meter, .0394 inch
Screen - a meshed wire fabric mounted on a frame for the
purpose of separating coarser from finer parts
Mesh - the opening between the wires of a screen - term
commonly used to describe or measure the size of crumb
rubber. Crumb rubber is sized by the screen or mesh through
which it passes in the production process. The finer the
screen/mesh the more openings it will have per linear inch,
i.e. 30 mesh means there are 30 holes or openings per linear
inch. The greater number of openings, the smaller the
material must be to pass through the screen. A minus "-"
symbol refers to material that has passed through the
screen, i.e -30. Technically crumb rubber sizes are
expressed in two numbers. The second number is preceded by a
plus (+) symbol and indicates the size particle that has
been retained on the screen
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Sieve - the device which includes the frame and the screen
used for separating coarser from finer parts
Classifier Screen - the screens or sieves that are mounted
in a production piece of equipment to separate the desired
size of crumb from the other sizes, and recycle the other
for the purpose of further size reduction
Testing Screen or Sieve - a small, hand-held sieve made for
testing the product coming off the classifier screen.
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