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Perforated sheets are manufactured with matching apertures at regular intervals by means of punching, drilling or milling. Any material, e.g. steel, stainless steel, copper, aluminium or plastic, can be perforated in virtually any technically feasible geometry.
As a standard value, the hole diameter and the bridge width should be no smaller than the thickness of the material used. The perforated sheets can be manufactured with or without an unperforated edge.
Punched perforated sheets always have a slight conical widening on the punch outlet side, causing a punching burr. Burr fineness can only be ensured by additional aftertreatment.
Particularly in the chemical and foodstuff industries, micro-perforated plates have made a significant contribution to solving difficult separation problems, e.g. with centrifuges. They now supplement fine-screen plates made from punch-perforated plates or wire mesh for separating processes that call for the highest precision and optimum throughput.
STEINHAUS supplies micro-perforated plates in the form of sheets and as segments of all kinds in dimensions of up to 1000 x 1000 mm, and thicknesses of 0.07 to 0.75 mm.
The surfaces of micro-perforated plates can, if required, be finished in hard chrome.
CONIDUR® perforated sheets
CONIDUR® perforated sheets are sheets with a special hole shape.
In contrast to the usual round hole shape with even hole sides in the through-pass direction, the perforations in the CONIDUR® perforated sheets are formed in a more triangular to half-elliptical shape, which means that they have conical openings placed at an angle in the through-pass direction.
The upper and lower side of the CONIDUR® perforated sheets differ in design.
Depending on the design of the perforation, one side (normally the side facing the product) is scaly and raw, with the other side being smooth.
The special manufacturing process enables the finest perforations in starting material sheets whose thickness may be a multiple of the hole width.
CONIDUR® perforated sheets are cold-worked during manufacture. This makes them very wear-resistant, a feature that can be further improved with the appropriate aftertreatment.
Depending on the specification, CONIDUR® perforated sheets can be processed into moulded products.
Electroformed sheets
Particularly in the chemical and foodstuff industries, electroformed micro-perforated plates have made a significant contribution to solving difficult separation problems, e.g. with centrifuges. They now supplement fine-screen plates made from punch-perforated sheets or wire mesh for separating processes that call for the highest precision and optimum throughput.
In recent years micro-perforated plates manufactured from pure nickel in an electroplating process have found application in countless branches of industry.
Design
- Perforated plates with round and square perforations and with slotted and special perforations.
- Perforated plates manufactured by electroplating, with a smooth upper surface on the working side and with perforations that widen conically in the through-pass direction.
- Smallest hole widths from 0.04 mm as a round or a slotted perforation.
- Special hole shapes on request.
Material
Soft or hard nickel with bright or very bright surface
Application
As filters, screen/centrifuge linings, printing stencils, separators for dust, water, oil, petrol, etc.
The advantages
- The hole shape can be adjusted to suit every intended use.
- The surface is completely smooth on the working side.
- High degree of resistance to corrosion, acid and abrasion. (This can be increased still further with the application of a layer of hard chrome).
- Holes that widen conically in the through-pass direction guarantee the greatest possible freedom from clogging.
Used in the following industries, among others
Chemicals & Pharmaceuticals
The pharmaceutical industry uses STEINHAUS products such as precision filters, wedge wire panels and wire mesh conveyor belts as easy-to-clean solutions for hygiene and clean room use.
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Agriculture
Perforated Plates, Separator cylinder, Plain screens & wedge wire panels, High Precision Filter Tubes.
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Food & Dairy
STEINHAUS is proud to be able to support many of these production processes with quality from our company and thus to contribute our share to feeding the world's population.
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Mechanical Engineering
Perforated Plates, Polyurethane Tension-, Polyurethane Frame-, Polyurethane Plain-, Rubber Screens, Cyclones, Spiral Concentrators, Plastic Conveyor Rollers & Polyurethane Support Rings, Spirals belts, High Precision Filter Tubes.
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