Overview

A custom copper electroformed mesh is an ultra-fine, stress-free screen built up as a thin pure-copper foil and then finished by photochemical machining to open precise apertures, rather than woven from wire or punched from rolled sheet. A photoresist mask is exposed with the mesh artwork, developed, and the unprotected copper is dissolved in a controlled spray, so hole diameter, strand width and open area are set by the artwork and etch time instead of a die. Typical stock runs from 0.015 mm to 0.12 mm, thinner than a woven equivalent, which lets the mesh reach well past 500 lines per inch with clean, burr-free edges and almost no residual stress.

For precision-screening and electrode buyers, a custom copper electroformed mesh solves three recurring problems: woven wire cannot hold micron-scale apertures or a flat, uniform surface, rolled foil curls and carries rolling stress at such thin gauges, and fine screens must stay dimensionally stable through bonding, plating or heating. Combining electroformed foil with chemical machining forms every aperture on a sheet at the same rate, holding hole size and strand width consistent from the first sample through volume production, while pure copper stays highly conductive and easy to plate or solder into a frame.

Parameter Window

• Available Materials: electroformed pure copper foil, oxygen-free C1020 copper, copper-nickel alloy; also electroformed nickel for mixed builds
• Material Thickness Range: 0.015–0.12 mm
• Tolerance: ±0.003 mm on aperture size, ±0.004 mm on strand width
• Minimum Feature: 0.018 mm hole diameter, 0.012 mm strand width, up to 600 lines per inch
• Surface Options: anti-tarnish passivation, nickel or gold plating, electropolishing, carrier release, ultrasonic cleaning, frame bonding
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Nesting — Convert the mesh array to vector art, verify aperture-to-thickness and strand rules, and lay out panels with shared registration marks.
2. Mandrel & Electroforming — Deposit ultra-thin pure copper on a polished mandrel and verify thickness, grain, stress and flatness.
3. Cleaning & Lamination — Degrease and laminate dry-film resist on both faces under matched heat and pressure without trapped bubbles.
4. UV Exposure — Expose the mesh artwork through high-resolution film, registered to the sheet edge for panel-level aperture consistency.
5. Development — Wash out unexposed resist to open the hole areas and inspect for residue that would block micron apertures.
6. Controlled Etching — Spray copper-matched chemistry, tuning time, temperature and conveyor speed to hold sidewalls and avoid strand thinning.
7. Stripping & Release — Strip resist, neutralize, then apply anti-tarnish passivation or nickel/gold plating and release the foil from the carrier.
8. Inspection & Packaging — Measure aperture, strand width and open area on a vision system, verify flatness, then mount on a frame or liner.

Core Advantages

1. Stress-free ultra-thin foil: Electroformed copper carries almost no rolling stress, so the mesh stays flat through bonding, plating and heating.
2. Burr-free micron apertures: Chemical removal leaves no rolled edge or loose wire, so particles do not shed into the screened media.
3. No die cost: Each mesh pattern is a new film, keeping prototype screens and frequent aperture changes economical without a stamping tool.
4. Very high mesh count: 0.018 mm holes and 0.012 mm strands form together, reaching up to 600 lines per inch with uniform open area.
5. Highly conductive: Pure copper carries current and heat far better than alloy foils, suiting electrode, shielding and thermal screens.
6. Repeatable custom arrays: A custom copper electroformed mesh can combine graded apertures, solid rims and logos on one foil, reproduced from first article to volume.

Typical Applications

• Electron-microscope grids: Ultra-flat specimen support meshes where aperture uniformity sets imaging quality.
• Precision sieving: Micron-rated screens for laboratory particle analysis and fine powder classification.
• Fuel-cell electrode screens: Conductive flow and support meshes that need uniform openings and low contact resistance.
• EMI shielding vents: Fine copper apertures that balance airflow, shielding effectiveness and optical transparency.
• Optical attenuator grids: Neutral-density meshes that trim light with a stable, fine opening ratio.
• Battery current collectors: Perforated thin foils for electrode substrates where flatness and conductivity matter.

Design Notes & Process Considerations

1. Aperture-to-thickness ratio: Keep hole diameter at or above roughly the foil thickness; very small holes in thicker stock distort from undercut.
2. Open-area callout: State hole diameter, pitch, open-area percentage and line count rather than only a mesh number, for reliable flow performance.
3. Foil and carrier: Specify foil thickness, whether it stays on a carrier or frame, and the release method for such thin, easily creased copper.
4. Plating and anti-tarnish: Define passivation or nickel/gold plating, since bare copper oxidizes and plating slightly reduces the effective aperture.
5. Tie bars and borders: Leave adequate solid rims and tie bars, and define final singulation so fine strands survive stripping and handling.
6. Handling and cleanliness: With a custom copper electroformed mesh, specify liner or frame packaging, fingerprint control and residual-ion limits for clean screening.