Overview

304 stainless steel atomizing screen chemical etching is the photochemical process behind the micro-perforated discs used in ultrasonic humidifiers, medical nebulizers, fuel nozzles and precision spray heads. A photoresist carrying thousands of micro-apertures is exposed on thin 304 stainless foil from 0.03 mm to 0.2 mm, and a controlled etchant opens tapered or straight holes from both faces, producing a flat, burr-free screen with a tightly defined pore size. Pore diameter, density and taper are set by the artwork and etch time, so droplet size and flow rate can be engineered rather than left to a punch or a woven mesh. 304 stainless is the default for corrosion resistance and fatigue life, with 316L used for aggressive liquids.

For appliance and medical-device buyers, 304 stainless steel atomizing screen chemical etching delivers micro-holes in the 0.03–0.08 mm range held to ±0.005 mm, with no torn rims to disturb the spray pattern and no work-hardened edges to crack under ultrasonic vibration. A full panel of identical pores gives consistent droplet distribution from the first sample to volume production, and the flat, stress-free foil bonds reliably to a piezo actuator. Because the tooling is a film, custom pore counts, patterns and prototype batches stay economical, and surface treatments such as electropolishing or hydrophilic coating can be added in the same flow.

Parameter Window

• Available Materials: 304/316L stainless steel, 301 on request
• Material Thickness Range: 0.03–0.2 mm
• Tolerance: ±0.005 mm on micro-hole diameter, ±0.01 mm on hole position
• Minimum Feature: 0.03–0.08 mm micro-holes, high pore density, straight or tapered walls
• Surface Options: electropolished, burr-free, hydrophilic / hydrophobic coating, passivated, clean wash
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Spray Review — Confirm pore diameter, density, taper and target droplet size against the actuator and liquid.
2. Material Selection — Choose 304 for general media, 316L for aggressive or chloride-bearing liquids.
3. Cleaning & Lamination — Degrease thin foil and laminate a high-resolution dry-film resist on both faces.
4. Dual-Side Exposure — Expose the micro-hole array front and back in register across a high-resolution film.
5. Development — Open the pore areas and inspect for resist bridging or missing dots under magnification.
6. Etching — Spray etchant from both faces, using short, tightly timed cycles to hold pore diameter and taper.
7. Stripping & Finishing — Strip, electropolish or passivate, and apply hydrophilic or hydrophobic coating as specified.
8. Inspection & Packaging — Measure pore diameter, density and flatness by vision system, then pack flat with lot records.

Core Advantages

1. Engineered droplets: Pore size and density are designed values, so droplet distribution is repeatable.
2. Burr-free micro-holes: Chemical pores have no torn rims to break the spray pattern or shed particles.
3. Fatigue-resistant edges: No work-hardened rim, so the screen survives long ultrasonic vibration cycles.
4. Flat for bonding: Stress-free foil bonds evenly to piezo actuators and seals without leaking.
5. High pore counts: Thousands of identical micro-apertures form in one cycle with no tool wear.
6. Coating flexibility: 304 stainless steel atomizing screen chemical etching supports electropolished, hydrophilic or hydrophobic surfaces and custom pore patterns without hard tooling.

Typical Applications

• Ultrasonic humidifier discs: Micro-perforated screens that set mist output and droplet size.
• Medical nebulizer meshes: Precision aperture plates for consistent aerosol drug delivery.
• Fuel and burner nozzles: Fine-pore screens that shape spray and atomization patterns.
• Perfume and cosmetic atomizers: Decorative, corrosion-resistant micro-perforated discs.
• Inkjet and dispensing filters: Fine screens that condition flow in precision fluid systems.
• Cooling and misting systems: High-density pore plates for evaporative cooling nozzles.

Design Notes & Process Considerations

1. Pore versus thickness: Keep pore diameter realistic for the foil — 0.03 mm calls for the thinnest stock and tight control.
2. Taper direction: Note which face the taper opens toward, as it affects droplet direction and clog resistance.
3. Density and flow: Relate pore count and open area to target flow rate and verify with the actual liquid.
4. Surface energy: Specify hydrophilic or hydrophobic coating where wetting behavior drives performance.
5. Flatness for bonding: Call out flatness so the screen seals to the actuator without leaking or damping vibration.
6. Panelization: Nest discs with shared fiducials and account for edge undercut on costly thin foil.