Perforated plates are a type of sheet metal that has been stamped or punched with a machine to create a pattern of holes. It is also known as perforated steel sheet, perforated sheet, or perforated screen and is most commonly made from stainless steel, cold-rolled steel, or aluminum.
Perforated plates were first developed about 150 years ago as a means of filtering coal for the mining industry. However, the perforation process was far from efficient. Laborers would manually punch individual holes into a steel sheet! Over the decades since its inception, the process has improved dramatically through the use of machinery that utilizes various punching needles arranged in a number of different patterns.
Plates are Made
The manufacturing process for perforated plates begin with average sheet metal. The steel sheet is thin and flat and can therefore be cut and bent into different shapes. The thickness of the steel sheet is specified in gauges; the larger the gauge number, the thinner the metal.
The most common method to perforate steel plates involves the use of a rotary pinned perforation roller. This is a large cylinder with a series of sharp, pointed needles on the outside to punch holes into the steel. As the steel sheet is run across the perforation roller, it rotates, continuously punching holes in the passing sheet. The needles on the roller, which can produce a wide variety of hole sizes, are sometimes heated to simultaneously melt the metal to form a reinforced ring around the perforation.
Another common perforating method is “die and punch” perforating. During this process, a sheet with needles is pressed onto the passing metal repeatedly, which punches holes into the sheet. The pieces remaining from the punching are then sheared off and the surface is smoothed. The die and punch method is very efficient and can perforate a large surface of sheet metal very quickly.
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