Perforated filter support cores

A perforated filter support core is the load-bearing and drainage structure behind a flexible or pleated filtering medium. It keeps the media in position, transfers differential-pressure loads and provides a flow path to or from the clean side of the element.

Conventional tube wall thickness: 0.4–1.5 mm
Joining strip: Solid longitudinal margin and seam position
End bands: Unperforated lands for rings, welds and end caps
Media-contact face: Smooth edges and continuous support contact

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Perforated filter support cores — Product view — Product view01 / 02

Product images

Perforated filter support cores — Product view

Product details

Construction and filtering function

A perforated core carries the filtering medium and provides fluid passages. Hole geometry, wall thickness, seam and end support define the structural load path.

Installation and fit

Provide outside and inside diameters, length, wall thickness, end condition, roundness and mating-part tolerances. Define whether the core supports inward or outward pressure.

Cutaway showing an outer perforated support and an inner fine filtering mesh.

Operating conditions and maintenance

Review differential pressure, buckling risk, flow distribution and contact with fine media. Burrs and protruding joints can damage the filter layer, so surface and edge requirements belong on the drawing.

Assembly inspection

The inspection record identifies the material, finished dimensions, joining surfaces and sealing interfaces. Measurements follow the installed geometry and the stated test conditions.

Integration with the filter assembly

The support core is specified from the filter layer outward: media-contact face, perforated wall, seam and end lands. Round holes and elongated openings are separate hole patterns; straight and spiral seams are separate joining layouts. Solid longitudinal margins provide a joining strip, and solid end bands connect the core to rings or end caps. For outside-in loading the core supports the filtering layer from inside; an outer support carries inside-out loading. Smooth media-contact surfaces and finished weld transitions protect the fine filtering layer during installation and cleaning.

Assembly interface map

Component / interface	Defined function and inspection
Perforated wall	Hole shape, pitch, remaining ligament and wall thickness
Joining strip	Solid longitudinal margin and seam position
End bands	Unperforated lands for rings, welds and end caps
Media-contact face	Smooth edges and continuous support contact
Installed core	Roundness, end alignment and support direction

Perforated filter support cores — Dimension

Dimension	Value (mm)
Outside diameter	22–100
Conventional tube wall thickness	0.4–1.5

These dimensions apply to the conventional perforated support-tube series. The supporting wall carries the filter medium; perforation size is a drainage/support dimension and the separate filtering layer defines retention.

Ordering and production

Supply item	Order basis
Production lead time	2–3 weeks after order and drawing confirmation.
Trial orders	Small trial quantities for fit and process evaluation.
Regular production orders	50 pieces or US$3,000 per order.
Quotation basis	Material, finished dimensions, filter construction, connections and quantity.

Perforated filter support core: hole pattern, wall thickness and 3D dimensions

Examine a stainless steel perforated support tube with Ø3 mm through holes on a 5 mm, 60° staggered pattern. The Ø50 × 250 mm configuration has a 1 mm wall and solid end zones; rotate or section the core to see the flow openings and the support structure behind filter media.

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Specifications

Perforated filter support cores
Parameter	Specification	Notes
Conventional tube wall thickness	0.4–1.5 mm	These dimensions apply to the conventional perforated support-tube series. The supporting wall carries the filter medium; perforation size is a drainage/support dimension and the separate filtering layer defines retention.
Joining strip	Solid longitudinal margin and seam position	—
End bands	Unperforated lands for rings, welds and end caps	—
Media-contact face	Smooth edges and continuous support contact	—
Installed core	Roundness, end alignment and support direction	—
Component materials	304 / 316L stainless steel; each filtering, support and end component has its own material designation.	—
Illustrated support-hole diameter	3 mm	Geometry of the illustrated construction; finished dimensions follow the equipment interface drawing.
Displayed configuration	Ø3 on 5 pitch, 60° stagger mm	Ø3 mm holes at 5 mm pitch in a 60° staggered pattern give 32.6% geometric sheet open area. Solid seams and end bands are outside this calculation.
Illustrated geometry	Ø50 × 250 long × 1 wall mm	Geometry of the illustrated construction; finished dimensions follow the equipment interface drawing.
Illustrated unperforated end-band length	15 each end mm	Geometry of the illustrated construction; finished dimensions follow the equipment interface drawing.
Outside diameter	22–100 mm	These dimensions apply to the conventional perforated support-tube series. The supporting wall carries the filter medium; perforation size is a drainage/support dimension and the separate filtering layer defines retention.

Production details and documented projects

33 µm Fine-Mesh Cylinders with Perforated Support

Delivered a Polish trial order combining fine 33 µm mesh with perforated support cylinders across three diameters; pre-shipment photographs were requested.

Perforated Filter Element with a Solid Welding Margin

Delivered a Bulgarian food-equipment filter element with specified 0.8 mm perforations and approximately 2 mm of solid metal beside the weld line.

Applications

Cartridge cores

Internal support for pleated or cylindrical media, matched to the load direction.

Protective sleeves

Outer protection where handling or external contact could damage the filtering surface.

Basket supports

Perforated bodies used with a separately specified mesh liner.

Selection guide

Include these details when discussing your requirements.

View specifications

Perforation: The inspection record identifies the material, finished dimensions, joining surfaces and sealing interfaces. Measurements follow the installed geometry and the stated test conditions.
Support structure: Rolled perforated sheet with defined thickness
Longitudinal seam: Butt, overlap or drawing-defined longitudinal joint
Dimensions: Provide outside and inside diameters, length, wall thickness, end condition, roundness and mating-part tolerances. Define whether the core supports inward or outward pressure.
Service conditions: Review differential pressure, buckling risk, flow distribution and contact with fine media. Burrs and protruding joints can damage the filter layer, so surface and edge requirements belong on the drawing.

Frequently asked questions

How are the assembly components identified?

Perforated wall: Hole shape, pitch, remaining ligament and wall thickness; Joining strip: Solid longitudinal margin and seam position; End bands: Unperforated lands for rings, welds and end caps; Media-contact face: Smooth edges and continuous support contact; Installed core: Roundness, end alignment and support direction

Which installation details define this product?

What does the finished-part inspection cover?

The inspection record identifies the material, finished dimensions, joining surfaces and sealing interfaces. Measurements follow the installed geometry and the stated test conditions.