Symbols Used to Describe Perforated Metal Plate
Perforated metal plate for industrial screening purposes is supplied in flat or coiled form, with nominal sizes of holes from 1 to 125 mm for round holes and square holes from 4 to 125 mm with a maximum plate thickness of 12.5 mm. Below is the symbols used to describe perforated metal plate screens.
|a1||overall length of the short side of a plate (plate width)||SPMP-2|
|a2||length of the short side of the perforated area of a plate||SPMP-2|
|b1||overall length of the long side of a plate (plate length)||SPMP-2|
|b2||length of the long side of the perforated area of a plate||SPMP-2|
|c||amount out-of-square of a rectangular plate||SPMP-3|
|e||width of the margins on the long sides of a plate||SPMP-2|
|e1||width of the larger e-margin, if not equal||SPMP-2|
|e2||width of the smaller e-margin, if not equal||SPMP-2|
|f||width of the margins at the short sides of a plate||SPMP-2|
|f1||width of the larger f-margin, if not equal||SPMP-2|
|f2||width of the smaller f-margin, if not equal||SPMP-2|
|g||deviation from edge flatness||SPMP-5|
|h||deviation from edge straightness||SPMP-6|
|p||pitch of holes||SPMP-1|
|t1||height of turn-in zone of hole||SPMP-4|
|t2||height of cutting zone of hole||SPMP-4|
|t3||height of breakaway zone of hole||SPMP-4|
|t4||height of burr on hole||SPMP-4|
|w||hole size, measured on punch side||SPMP-1|
|wb||hole size, measured on reverse (burr) side||SPMP-4|
SPMP-1: Examples of hole arrangements.
SPMP-2: Characteristics of a perforated plate.
SPMP-3: Measurement of amount out-of-square.
SPMP-4: Cross-section of perforated metal plate
SPMP-5: Measurement of wavy edge
SPMP-6: Measurement of edge bow
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