Perforated filter support cores
A perforated filter support core is the load-bearing and drainage structure behind a flexible or pleated filtering medium.
Product detailsDrawing-based manufacturing
Filter cylinders and tubes
Custom woven-mesh cylinders, perforated support tubes and wedge-wire screen cylinders for equipment inserts and replacement assemblies. Define the filtering wall, support, longitudinal seam, end condition and flow direction as one finished tube assembly.
- Surface
- Woven · perforated · wedge · sintered
- Flow
- Outside-in or inside-out
- Ends
- Plain · capped · flanged
Metal filtration componentsFilter cylinder and tube configurations
Construction
How a cylinder is built
- Rolling directionWoven cloth orientation and sheet stiffness affect roundness. Measure the finished cylinder after joining rather than using the flat blank alone.
- Seam locationAn overlap seam adds local thickness; a welded butt seam can reduce that step. Keep seam and weld details clear of seals or close-fitting seats.
- Load directionOutside-in flow loads an internal support; inside-out flow loads the wall and seam in expansion. Define normal filtration and reverse cleaning as separate load directions.
- Function splitFine woven mesh uses a separate core or cage to carry differential-pressure loads. Wedge-wire cylinders and rigid sintered constructions can combine screening and structural support; profile, wall and support spacing are selected for the flow direction and load.
- Core openingA perforated backing core supports a finer filtering layer and provides drainage. When the perforated tube itself is the screening surface, its hole diameter defines the geometric opening.
01Rolling direction
02Seam location
03Load direction
04Function split
05Core opening
Give each layer a defined job
A cylindrical shape can provide the filtering surface, a load-bearing core or a protective outer sleeve. Identify these jobs on the cross-section before selecting the wall. Woven cloth supplies a defined aperture; a separate perforated core or cage supports the cloth and provides drainage. A wedge-wire cylinder combines continuous slots with welded profile wires and support rods.
Name the inner and outer surfaces and mark normal flow and reverse cleaning. This fixes the side on which the fine layer meets its support. Include the seam and end attachments in the same view: every transition between the medium, end ring and connection contributes to the complete filtering boundary.
Measure the tube after rolling and joining
The flat blank determines the rolled circumference, while the finished cylinder determines the fit. Give finished OD or ID at the mating location, overall length, active filtering length and the positions of solid end bands. An overlap, butt joint or longitudinal weld occupies a defined part of the wall and changes local thickness.
Keep the seam clear of close-fitting seats and identify any alignment feature used during installation. Check diameters at both ends and intermediate sections, then check end squareness and connection position. Drawings for replacement tubes also capture the core, outer protection and accessible cleaning surfaces so that the internal construction follows the original flow path.
Compare filter cylinders and tubes
Woven-mesh sleeves, perforated support tubes and slotted screen cylinders for radial flow, internal support and equipment inserts. Diameter, seam construction and which surface carries pressure determine the right tube.
| Construction | Application and fit | Confirm first | Find a product |
|---|---|---|---|
| Open-ended cylinders | Both ends remain open and the equipment provides retention. | OD or ID priority, length, seam, edge and clearance. | Filter matching products |
| Perforated support cores | Fine media needs a rigid drainage and load-bearing tube. | Diameter, length, wall, perforation, open area and collapse direction. | Filter matching products |
| Filter nozzles | Stainless steel wedge wire filter nozzles combine a continuous-slot cap with a mounting stem for media retention, underdrain collection and water distribution in treatment vessels. | Choose slot width against the smallest media fraction and the service flow direction. Match stem length and bore to plate thickness, access and collection space. | Filter matching products |
| Pulp pressure-screen baskets | Stationary slotted screen baskets for pulp pressure screens, with inward-flow or outward-flow construction, reinforced cylindrical walls and machine-specific mounting interfaces. | Select inward or outward flow from the machine’s feed and accepts circuit. Define slot, active side and profile for the pulp and separation duty. | Filter matching products |
Product forms and construction details
Choose by end condition
Filter cylinder and tube configurations
Define the cylindrical envelope, seam and end treatment before selecting the screen material and support arrangement.
01
Open-ended cylinders
Straight cylinders with trimmed, folded or ringed open ends.
View matching products →02
Perforated support cores
Structural tubes used beneath fine filter media or inside a cartridge.
View matching products →
03
Filter nozzles
Stainless steel wedge wire filter nozzles combine a continuous-slot cap with a mounting stem for media retention, underdrain collection and water distribution in treatment vessels.
View matching products →
04
Pulp pressure-screen baskets
Stationary slotted screen baskets for pulp pressure screens, with inward-flow or outward-flow construction, reinforced cylindrical walls and machine-specific mounting interfaces.
View matching products →Filter cylinders and tubes
Find a product
7 products
Woven mesh filter cylinders
Stainless steel woven mesh cylinders combine a defined wire-cloth opening with a welded cylindrical body, reinforced ends and flow-directed support.
Product details
Wedge wire filter cylinders
Continuous-slot wedge-wire cylinders provide a rigid screen surface for water intake, resin retention and process separation.
Product details
Laser-slotted filter tubes
Kaifil manufactures laser-slotted filter tubes with axial, circumferential, staggered or zoned patterns.
Product details
Laser-Perforated Stainless Steel Filter Tubes
Kaifil manufactures laser-perforated stainless steel tubes with round holes, straight or staggered rows and solid end bands.
Product detailsWedge Wire Filter Nozzles
Stainless steel wedge wire filter nozzles combine a continuous-slot cap with a mounting stem for media retention, underdrain collection and water distribution in treatment vessels.
Product detailsPressure Screen Baskets for Pulp Screening
Stationary slotted screen baskets for pulp pressure screens, with inward-flow or outward-flow construction, reinforced cylindrical walls and machine-specific mounting interfaces.
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Clear filters
What we need to make a cylinder
Separate the retention from the structure first — then the cylinder is sized to the load and the interface.
Diameter and ovality
Give the fitted bore or outside diameter and where it is measured; a local seam can affect insertion.
Active length
Separate screened length from solid end bands, caps and flanges.
Seam and ends
Identify longitudinal seam position, weld buildup and whether the ends are open, capped or flanged.
Core versus screen
A perforated core with millimetre-size holes supports a finer filtering layer. When the bare perforated tube provides coarse straining, specify its hole diameter as the geometric separation opening.
Function split
Retention layer, drainage layer, support core and protective cage — which the part has to perform
Diameter and length
19–1200 mm OD · wedge wire cylinders 100–1200 mm · lengths to 4 m, to 6 m on tubes
From tube geometry to an inspectable assembly
Separate envelope dimensions, active surface and joining details on the same drawing.
| Detail | Drawing definition | Effect in the assembly | Inspection location |
|---|---|---|---|
| Filtering layer | Weave/aperture or slot and working face | Defines the screening surface | Active surface and transitions |
| Support tube | Hole pattern, wall and support position | Carries load and provides drainage | Under the filtering layer and at ends |
| Longitudinal joint | Joint type, position and local step | Closes the cylindrical wall | Full seam length and mating zones |
| End bands and connections | Band length, ring, flange or open end | Locates the tube and fixes its boundary | Both ends and installed datum |
Filter cylinders and tubes
Applications
Cylindrical elements sit wherever the filter has to be a rigid body inside a housing, a wellbore or a vessel.
Process housings
Mesh sleeves and capped tubes for removable radial-flow inserts.
Cartridge cores
Perforated tubes carry the load beneath pleated or fine mesh media.
Vessel internals
Slotted and wedge-wire cylinders retain solids or process media with the specified flow direction.
Automatic and self-cleaning filters
Wedge wire cylinders in scraper filters, automatic sewage filters and rotary drum screens, where continuous slots keep the open area up.
Check the cylinder after joining
The welded part, not its flat pattern, must fit the equipment.
Roundness
Measure diameters at the ends and along the tube.
Seam continuity
Inspect holes, cracks, loose wires and local weld projections.
End geometry
Check squareness, end-band length and the fitted flange or cap.
Inspect the complete cross-section
Check the layer order, drainage path and attachment at both ends. Record the seam position with the measured finished diameters and end alignment.
Project and production examples
Custom 800 µm Stainless Steel Mesh Cylinders for Industrial Equipment
Delivered AISI 304 mesh cylinder samples for a German industrial equipment project, ahead of proposed quantities of 4,000 and 10,000 pieces.
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.
Irrigation Screen Filter Elements in Five Mesh Ratings
Delivered an Indian irrigation-screen project covering two element sizes and 30, 50, 100, 150 and 200 mesh specifications.
Filter cylinders and tubes
Technical resources
Technical guide
Perforated open area and structural support
Relate perforation pattern and solid welding margins to support and available flow area.
Perforated open area and structural support→Technical guide
Filter rating, aperture and beta ratio
How to compare woven openings, porous-media claims and test-rated filter elements without treating every micron number as equivalent.
Read guide→Metal Filter End Connections: DOE, SOE, 222, 226, Threads and Flanges
Match open ends, rings, threads and flanges to the tube’s housing interface.
Metal Filter End Connections: DOE, SOE, 222, 226, Threads and Flanges→Resin retention screens and vessel internals
Place screening cylinders and distribution tubes within the correct vessel-retention duty.
Resin retention screens and vessel internals→Wire Mesh Edges, Retaining Rims and Seams
Choose cut edges, spot-joined layers, retaining rims and cylinder seams by their assembly task. Define the active opening, clamping land, layer retention and bypass boundary on one finished-part drawing.
Wire Mesh Edges, Retaining Rims and Seams→Screening Components for Pulp and Paper
Match pressure-screen baskets, black-liquor drums, coating screens, sieve bends, centrifuge baskets and pulper plates to their place in the pulp and paper process. Compare screening duty, flow path and machine interfaces.
Screening Components for Pulp and Paper→Filter cylinders and tubes
Questions before ordering
Is a perforated tube a complete filter element?
Often it is only a core or protective sleeve. If the perforations themselves provide straining, the hole size defines the geometric screen opening.
Which dimensions identify a replacement cylinder?
Outside and inside diameters, total and screened lengths, end details, seam, material, wall or mesh construction, and flow direction.
Should the tube be supported from the inside or outside?
Support follows flow direction and collapse risk. Show normal and reverse-flow arrows and the maximum differential pressure so the core, seam and end joints can be arranged correctly.
Which diameter belongs on a replacement-tube drawing?
Identify the actual mating surface and state finished OD or ID there. Add the measurement position, tolerance and seam step, then record overall length and active filtering length separately.
How is the support position defined?
Show the filtering layer and its support on a cross-section with normal-flow and reverse-cleaning arrows. Mark the longitudinal seam, end attachment and any protective outer sleeve.
Related products and guidance
Materials and alloys
View details
Filter parts and accessories
View details
How to specify a custom metal filter
View details
Filter rating, aperture and beta ratio
View detailsPerforated open area and structural support
View detailsCustom 800 µm Stainless Steel Mesh Cylinders for Industrial Equipment
View details33 µm Fine-Mesh Cylinders with Perforated Support
View detailsResin retention screens and vessel internals
View detailsIrrigation Screen Filter Elements in Five Mesh Ratings
View details
Metal Filter End Connections: DOE, SOE, 222, 226, Threads and Flanges
View detailsTechnical enquiry
Define the dimensions, media, joints and inspection records before confirming the order.