Overview

Thin filter mesh etching cuts precise hole arrays into stainless foil as thin as 0.02 mm without stretching, wrinkling or bowing the web. Grades 304/316L are laminated, imaged on both faces and etched in ferric chloride so apertures from 0.05 to 0.5 mm open with clean, burr-free walls and an open area between 30% and 60%. Because the material is chemically removed rather than punched, there is no mechanical force to distort the foil, and a supporting frame or unetched border can be left in place to carry the delicate mesh through handling and assembly. Flatness, not just hole size, is the hard part of this work.

Holding a 0.03 mm foil flat through cleaning, exposure, etching and stripping takes a carrier strategy: the part is usually etched with a solid rim, a coarse support grid or a temporary backing film that is removed only after framing. Etch factor is compensated in the artwork so the finished ligament, not the film image, hits the target width, and spray pressure is kept low to avoid flutter. Thin filter mesh etching is therefore specified for fuel, ink, medical and analytical filters where a deformed mesh would change flow rate or let particles bypass the media.

Parameter Window

• Available Materials: stainless steel 304/316L, 316L preferred for chloride service, nickel and titanium on request
• Material Thickness Range: 0.02–0.15 mm, with 0.03–0.08 mm the common window for fine filters
• Tolerance: hole diameter ±0.01 mm, pitch ±0.02 mm, flatness <=0.1 mm per 100 mm
• Minimum Feature: 0.05 mm hole, 0.04 mm ligament, open area up to 60% at 0.05 mm foil
• Surface Options: bare, electropolished, passivated, framed, laminated to a support ring, adhesive backing
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Open-Area Check — Compute open area and ligament width from the flow target, then confirm the layout leaves a solid handling rim.
2. Foil Selection — Choose gauge and temper, and inspect the coil for camber and rolling marks that would telegraph into the mesh.
3. Carrier Lamination — Laminate dry film on both faces, optionally with a temporary backing carrier for foils below 0.05 mm.
4. Dual-Side Exposure — Expose front and back artwork in register, keeping the border and support grid solid in both images.
5. Development — Develop both faces and inspect the dense hole field for scumming before the fragile foil sees etchant.
6. Low-Pressure Etching — Spray ferric chloride at reduced pressure and fixed Baume to open holes without fluttering or thinning the ligaments.
7. Stripping & Framing — Strip resist, rinse gently, then bond the mesh to a support ring or frame while the border still carries it.
8. Flatness & Flow Inspection — Measure hole diameter, open area and flatness, run a bubble-point or flow check, then pack between rigid sheets.

Core Advantages

1. No mechanical distortion: Chemical removal puts no punching force into the foil, so a 0.02 mm web stays flat and unstretched.
2. Burr-free holes: Apertures open with smooth walls and no rolled edge, so flow is uniform and particles do not snag on burrs.
3. High open area: Ligaments down to 0.04 mm allow up to 60% open area without weakening the panel.
4. Integral support rim: A solid border or coarse grid is etched in the same step, making the delicate mesh easy to handle and mount.
5. Consistent filtration: ±0.01 mm hole control keeps cut-point and flow rate repeatable from the first panel to the last.
6. Flat finished part: A controlled thin filter mesh etching line delivers a framed, flat mesh that seats in a housing without wrinkling.

Typical Applications

• Fuel and hydraulic filters: 316L meshes with 0.1 mm holes for injector and hydraulic line protection.
• Inkjet printer filters: Fine aperture screens that stop pigment agglomerates before the printhead nozzles.
• Medical infusion filters: Passivated fine mesh for IV sets and drug-delivery devices, supplied burr-free.
• Analytical sieve screens: Calibrated hole arrays for particle sizing and laboratory sample preparation.
• Acoustic and vent meshes: Thin perforated foils that guard microphones and pressure vents while passing sound.
• Battery and fuel-cell screens: Current-collector or gas-diffusion support meshes with a framed border.

Design Notes & Process Considerations

1. Ligament versus open area: State the target open area and the minimum ligament together; pushing past 60% leaves too little metal to etch cleanly.
2. Etch factor compensation: Give the expected undercut at the chosen gauge and oversize the artwork so the finished ligament, not the film, meets spec.
3. Support border: Keep a 3–5 mm solid rim or a coarse grid around the field, or the thin mesh will fold during stripping and inspection.
4. Hole shape callout: Specify round, slot or shaped holes and the corner radius, since sharp corners concentrate etch and open up first.
5. Flatness and handling: Require flatness per 100 mm and shipment between rigid sheets for foils under 0.05 mm.
6. Post-treatment: Decide whether electropolishing or passivation follows etching, as both change the final hole diameter slightly.