Overview

A stainless steel electroformed screen is built by precision electroforming, an additive process that grows a freestanding metal mesh atom by atom on a patterned mandrel rather than cutting apertures out of a solid sheet. A conductive master is coated with photoresist and imaged so that thousands of resist islands stand exactly where the holes will be; the part is then immersed in a controlled electrolyte and metal is deposited around those islands until a continuous foil of the designed thickness is formed. When the grown foil is released from the mandrel and the resist is stripped, what remains is an ultra-fine, aperture-accurate screen with straight, smooth sidewalls and none of the undercut that photochemical etching leaves behind. Because the mesh is grown rather than dissolved, apertures down to about 0.02 mm are achievable in foil as thin as 0.02 mm, an order of magnitude finer than subtractive etching can hold.

For a buyer, a stainless steel electroformed screen solves problems that neither woven wire nor etched foil can: truly microscopic openings at tight pitch, near-perfect hole-to-hole uniformity, and a smooth, burr-free surface that will not snag particles or fibers. Stainless steel 304/316L is the standard specification, with optional copper or nickel variants where conductivity or a different surface is needed. The aperture geometry is defined by the photomask on the master, so every screen released from one mandrel is essentially identical, and a design change is a new master rather than a new die. ISO 9001 process control holds thickness, aperture and open area within tight limits from the first article through volume production.

Parameter Window

• Available Materials: stainless steel 304/316L, with optional nickel and copper variants
• Material Thickness Range: 0.02–0.30 mm; 0.03–0.10 mm typical for fine filtration screens
• Tolerance: ±0.005 mm on aperture diameter, ±0.01 mm on pitch, about ±10% on foil thickness
• Minimum Feature: 0.02 mm (20 µm) round aperture and 0.015 mm line width on 0.02 mm foil
• Surface Options: bright as-deposited, matte, passivated, nickel or gold plating, release liner
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Master Preparation — Polish a conductive mandrel to a mirror finish and verify flatness, since the grown foil replicates the master surface exactly.
2. Photoresist Imaging — Laminate dry film on the mandrel and expose the aperture artwork so resist islands stand where the openings will be.
3. Electrolyte Setup — Charge the plating bath with the target alloy chemistry, filter it and stabilize temperature and pH before deposition.
4. Electroforming / Deposition — Apply controlled current density so metal builds up around the resist islands into a continuous foil of the designed gauge.
5. Growth & Stress Control — Monitor time, current and agitation to hold thickness, grain size and internal stress uniform across the whole panel.
6. Release / Demolding — Peel the grown foil off the mandrel as a freestanding screen without any mechanical cutting or punching.
7. Resist Strip & Finishing — Remove the islands, passivate, flatten and, where needed, plate or laminate a release liner.
8. Inspection & Packaging — Verify aperture size, pitch, thickness and open area against the master, then pack between protective liners with first-article data.

Core Advantages

1. Apertures finer than etching allows: Because the mesh is grown, openings to 0.02 mm hold cleanly at tight pitch where subtractive etching would undercut or close up.
2. Additive, not subtractive: No etchant, no undercut and no tapered sidewalls, so hole walls are straight and the aperture is the same on both faces.
3. Mirror-smooth, burr-free surface: The foil replicates a polished mandrel, giving a snag-free surface that suits fine powders, fibers and cell screening.
4. Master-level repeatability: Every screen released from one mandrel is essentially identical, and a design change is a new master, not a new stamping die.
5. Ultra-thin yet self-supporting: Foil from 0.02 mm stays flat and handleable, so fine mesh can be supplied without a woven backing layer.
6. One route from prototype to volume: With a stainless steel electroformed screen, the validated master runs from a few pieces to thousands, so sampling and production share one geometry and switching carries little risk.

Typical Applications

• Micro-particle and cell screening: Ultra-fine apertures for laboratory sieves, cytology and precision powder classification with uniform openings.
• Inkjet and dispensing nozzles: Micro-hole arrays that meter fluid with uniform droplet formation and smooth walls that resist clogging.
• High-resolution printing meshes: Fine stencil screens for thick-film, solder paste and electronics printing where edge definition matters.
• Optical and sensor apertures: Pinhole arrays, masks and encoder grids that need sharp, well-defined edges.
• Precision filtration membranes: Thin stainless screens for medical, analytical and fuel-cell gas diffusion layers with low flow resistance.
• Aerospace and instrumentation grids: Lightweight, burr-free meshes for flow straightening and EMI shielding without added bulk.

Design Notes & Process Considerations

1. Aperture size versus thickness: Keep the opening at least comparable to foil thickness; very small holes in thick foil are hard to release cleanly.
2. Pitch and open area: State pitch and target open-area percentage, since dense arrays raise internal stress during growth.
3. Hole shape and sidewall: Specify round, square or slot geometry and confirm that vertical sidewalls are required, as electroforming delivers them by nature.
4. Mandrel surface and finish: Name the desired surface — bright, matte or passivated — because the foil copies the master finish.
5. Tolerance callout: Separate aperture tolerance from pitch tolerance and agree the measurement method, typically optical comparison to the master.
6. Panelization and handling: Group screen variants on one mandrel with shared fiducials, and note the release liner or frame needed for safe handling.