Definitions for Industrial Perforated Plate Screens - Coil or Sheet

Perforated metal plate used for industrial screening purposes and supplied in flat or coiled form, materials may be low carbon steel or other metals, nominal sizes of round holes from 1 to 125 mm and square holes from 4 to 125 mm with a maximum plate thickness of 12.5 mm. Definitions for industrial perforated plate screens are listed below:

• Plate: Flat rolled material for the manufacture of perforated metal plate, 3 mm to 12.5 mm thick, the edges of which are allowed to deform freely during rolling, supplied in flat form and generally in rectangular shape, but also in any other shape according to a design sketch.
• Sheet: Flat rolled material for the manufacture of perforated metal plate, less than 3 mm thick, the edges of which are allowed to deform freely during rolling, supplied in flat form and generally in rectangular shape, but also in any other shape according to a design sketch.
• Coil: Flat rolled sheet for the manufacture of perforated metal plate, the edges of which are allowed to deform freely during rolling and which immediately after the final rolling pass is wound into regular superimposed laps.
• Perforated plate: Screening surface consisting of a plate with uniform holes in symmetrical arrangement. The holes may be square, slotted, circular or of other regular geometrical shape.
• Plate thickness: Thickness of the plate before perforation.
• Feed direction: Direction in which a plate or sheet was fed through the perforating press.
• Punch side: Surface of a perforated plate which the punch entered.
• Hole size: Diameter of a round hole or distance between opposite sides of a square hole of a perforated metal plate.
• Pitch: Distance between corresponding points of two adjacent holes in a perforated plate.
• Bridge width; bar: Distance between the nearest edges of two adjacent holes in a perforated plate.
• Margin: Distance between the outside edges of the outside rows of holes and the edges of a perforated plate.
• Percentage open area: Ratio, expressed as a percentage, of the total area of the holes to the total area of the perforated part of the plate (excluding any non-perforated parts).
• Roller levelling: Cold mechanical operation on a perforated metal plate to promote flattening.