Perforated metal filter

Perforated metal filter is the filter element made by perforation of the metal sheet or part. There are round, square, hexagonal or other shape holes on the perforated metal. The holes are aligned by certain pattern with specific pitch and angle. Then the hole diameter and pattern determine the opening area.

Perforated metal sheet square and round hole

Perforated metal tube

Perforated metal tube is widely used in coarse particle filter. High pressure filtration in oil and water well drilling application often use large dimension and thickness metal tube. Filter strainers may also use perforated metal tube, as it has simple structure while can work in wide range of filter rating and pressure.

Perforated metal fube for filter element support and protection

Perforated metal tube is also essential component for some filter elements. For example, the stainless steel pleated filter elements may use perforated metal tube inside as the support cone and outside as the protection sleeve. The inside tube is often round hole and outside is square hole.

The non-metallic filter element may also use perforated metal tube for support and protection. The yarn / string wound filter use the perforated metal tube as inner cone and many hydraulic or oil filter have perforated metal tube as outer sleeve.

Spiral welding perforated metal tube

Spiral welding perforated metal tube is made by winding and welding of the perforated metal band. It is flexible to make various diameter filter tube. It have good strength and can save cost.

Round hole spiral welded perforated tube is common. However, there are also square hole spiral welded perforated metal tubes with larger opening area.

Drilled seamless tube

Drilled seamless tube is another kind of perforated metal tube. It is made from seamless metal tube. The holes are drilled by laser beam or machine drilling. The seamless perforated tube has no risk of welding seam failure and is preferred choice for critical and high pressure applications.

Perforated metal disc

Perforated metal disc is the metal disc with perforation. Some semi-automatic coffee machine has the perforated metal disc as there coffee filter. This kind of disc is often thin with small holes and made by etching.

Perforated metal disc with larger thickness is often seen in extractor or nutsche filter. This kind of metal disc  whether works as support for other finer filter media, or is sintered with fine mesh to form a sintered wire mesh disc. The perforated metal can significantly increase the pressure resistant of these filtration system.

Laser drilled filter disc

Laser drilled filter disc is the kind of perforated metal with high aspect ratio as large as 20. The aspect ratio is the hole depth ( metal thickness) to hole diameter. For instance, the filter disc in 2mm thickness may have 100 micron holes perforated. This high ratio gives the laser drilling perforated metal disc higher strength and simpler structure than other wire mesh filter disc. Typical application of the laser filter disc is screen filter for polymer filtration.

Perforated metal filter cone

Perforated metal filter cone have larger filtration area than the disc type. It can be used in strainer filter.

Rasping hole cone mill screen

Rasping hole is also called grater hole. It is a special perforated hole with a raise-up on one side to create a rasp for tearing down or cutting the passing substances. Grater hole cone screen is a mill machine option for product reclaim or rasping.

Perforated metal basket

Perforated metal filter basket is another application of the perforated metal. The basket shape filter can collect the particle / goods in the basket while let the liquid pass through the holes. This is popular in wine making and brewing.

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