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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
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.
examples
of mesh screens
example
of sieving
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