Traditionally, many filters used metal perforated cores or wire cages for support, but today’s advanced systems often benefit from extruded plastic rigid tubes and cages. These components – essentially heavy-duty plastic mesh cylinders – are used in applications like baghouse dust collectors, high-flow liquid cartridges, and industrial air filters to hold filter media in shape and allow unimpeded flow.
GESSNER’s Conwed™ rigid tubes and cages are precision-engineered, extruded square netting supports that combine strength and flow efficiency for demanding air and liquid filtration applications. This introduction of polymer-based rigid supports is transforming how filter manufacturers achieve toughness and efficiency in their designs.
Requirements for Materials & Design
Rigid filter support must meet multiple requirements:
- Structural Strength & Stability: They must prevent filter collapse or deformation under stress. Thick, well-engineered plastic net structures can match or exceed metal in strength, while avoiding metal’s brittleness (no bending or denting) and weight.
- Durability in Harsh Environments: Many filters operate in corrosive or high-temperature environments. Plastic support tubes made from high-performance resins resist chemicals and high heat, unlike metals that might corrode or weaken at extreme temperatures.
- High Open Area for Flow Efficiency: The support should hold the media but not block flow. The open-mesh design maximizes available flow area, helping reduce pressure drop while supporting efficient system performance.
- Precise Tolerances & Customization: Filter designs vary widely. A quality support tube or cage must perfectly match the application requirements in diameters, lengths, and mesh sizes, with precision dimensions to fit seamlessly. GESSNER offers both standard options and fully custom designs, ensuring each support meets the customer’s exact filter requirements.
How Rigid Tubes & Cages Work
In a filter assembly, a rigid tube or cage typically sits at the center or around the outside of a filter element. Its job is to provide mechanical support – keeping a pleated filter media from collapsing – and to act as a flow conduit, especially if it’s a core.
For example, in a pleated cartridge, the inner rigid core holds the pleats open and allows the filtered fluid to flow through its perforations or mesh into the outlet. In a dust collector bag filter, a filter cage inserted into the fabric bag keeps it from caving in when air is pulled through.
GESSNER’s rigid tubes and cages, being made from robust extruded square plastic netting, fulfill these functions while also delivering extra benefits: they reduce weight and eliminate metal corrosion, ensuring a clean process stream. The open mesh design of our Conwed™ tubes further ensures optimal flow – more open space means the filter medium can do its job without undue restriction. The result is a filter that not only stands strong but also performs efficiently.
Rigid tubes and filter cages are indispensable for high-performance filtration, providing the skeletal strength that holds filters together under pressure. By shifting from traditional metal cores to advanced plastic mesh supports, filter manufacturers gain significant advantages: lighter components that won’t corrode or compromise product purity, and designs that maximize flow and efficiency.
With our material science expertise and customization capabilities, customers can obtain rigid tubes and cages precisely tailored to their filter dimensions and operating conditions. These support components can be crafted from specialized polymers to meet extreme requirements – from high-temperature resilience to chemical resistance – ensuring the filter’s longevity and consistent performance.
Contact us to explore how our rigid tubes and cages can strengthen your filters and improve overall system performance.
