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Perforated metals
| DEFINITION OF TERMS |
| Width of hole |
In the case of round hole, this is the
diameter; in the case of a slot hole the smaller measurement, and
in case of a square hole the length of the side. |
| Length of hole |
In the case of slot hole this is the longest
dimension. (please also specify if slots are to run parallel to length
or width of the sheet) |
| Pitch |
The measurement from the center to center
of the holes. But for slots, please include the 2 pitches for sideways
(side pitch) as well as the longside (end pitch). |
| Bridge |
The smallest unperforated distance between
the holes. ( Again for slots, two dimensions must be specified - side
and end bridge). |
| Flow direction |
This is the running direction of the goods
to be screened. The best screening will be attained by staggering
the perforation rows in running direction of the goods to be sieved. |
| Open Area |
Thes is the percentage of the 'open' or
perforated areas. It is important in calculating the rate of flow
( see formula) and has a considerable influence on the load carrying
capacity of the perforated sheet. |
| DESCRIPTION |
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- Perforated Sheet
- Length
- Width
- Sheet Thickness
- Without margin
(Perforated all over)
- Margins
(Long sides)
- Margins
(Short sides)
- Margins
(All around)
- Sectional Perforation
- Width of hole
- Triangular Pitch, longitudinal
- Triangular Pitch, transverse
- Square Pitch
- Diagonal Pitch
- Staggered parallel to Width
- Staggered parallel to Length
- End Staggered parallel to Width
- End Staggered parallel to Length
- Straight parallel to Width
- Straight parallel to Length
- Pitch
- Row of holes
- Hole length
- Hole width
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LIMITATIONS AND NOTES:
The thickness of the sheet should not exceed the diameter of round holes
or 1.5 times the width of oblong holes.
The bridge between the holes should be greater than the thickness of
the sheet. -In soft metals such as Brass and Copper it is suggested that
the maximum thickness of the metal be the same size as the diameter of
the hole or less, in Steel two thirds and in Stainless Steel one half.
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