Etched mesh, filter screens and test sieves are precision thin metal components manufactured via photochemical etching. Unlike woven wire mesh made by interlacing metal wires, etched mesh is formed by selectively etching holes directly from a solid metal sheet. It delivers uniform, repeatable aperture geometry for particle separation, fluid filtration, gas diffusion and particle size analysis. Common materials include SUS304 / SUS316 stainless steel, titanium, nickel, copper and brass, with typical thickness from 0.02 mm to 0.5 mm. Hole shapes can be round, square, rectangular slotted, hexagonal or fully custom patterned.

Step-by-Step Etching Workflow for Mesh, Filters and Sieves

1. DFM & Pattern Design Review
Engineers optimize hole pitch, aperture diameter and open area ratio. Undercut compensation is added into CAD drawings to offset isotropic wet etching, ensuring consistent hole size across the entire mesh sheet. For analytical test sieves, strict angular and dimensional tolerances are maintained for accurate particle grading.

2. Metal Surface Pre-treatment
Ultra-thin metal foils go through degreasing, pickling and ultrasonic cleaning. Complete removal of oil and oxide is essential to avoid pinholes, incomplete etching or photoresist delamination.

3. Dual-sided Dry Film Lamination
Photosensitive dry film is bonded to both sides of the cleaned metal substrate under controlled heat and pressure.

4. UV Exposure & Development
UV light transfers the mesh pattern onto photoresist through a precision photomask. Unprotected resist covering hole areas is washed away by developer, exposing bare metal ready for etching.

5. Controlled Double-sided Spray Etching (Core Step)
Etchant is sprayed synchronously from top and bottom surfaces. Exposed metal is dissolved evenly to form through holes. No mechanical cutting force or thermal impact. Etch parameters are tightly controlled to guarantee identical aperture dimensions across the whole panel.

6. Resist Stripping & Multi-stage Cleaning
The cured photoresist mask is stripped off. Multi-stage rinsing removes residual etchant to prevent corrosion and meet clean requirements for medical and food-grade filter parts.

7. Precision Quality Inspection
Inspect aperture size, hole uniformity, open area ratio, flatness, edge quality and overall dimensions. For laboratory test sieves, particle sizing verification is performed.

8. Optional Post-processing
Surface treatments such as passivation, electropolishing or plating can be applied to improve corrosion resistance and surface smoothness. Parts can also be framed, folded or welded into final filter assemblies.

Core Advantages of Etched Mesh / Filters / Sieves

1. Burr-free, smooth hole walls
Metal removal at molecular level creates clean hole edges with no micro-tears or burrs. This eliminates particle shedding, critical for medical, food and analytical lab filtration.

2. Zero residual stress, excellent flatness
Non-contact chemical processing introduces no work hardening. Thin mesh sheets remain flat without warping, supporting reliable assembly and consistent flow distribution.

3. High aperture uniformity & micron precision
Hole size and spacing stay consistent over the full mesh area. Tolerances can reach ±0.005 mm, far more repeatable than woven mesh for fine particle classification.

4. Flexible custom pattern design
Supports variable hole density, gradient mesh, irregular outer contours, multi-size apertures on a single piece. Logos or identification marks can be integrated directly on the mesh.

5. No hard tooling cost, fast prototyping
Only digital photomask artwork is required. Pattern revisions only modify CAD files, well suited for R&D trials, custom filter development and low-to-medium volume orders.

6. No loose wires or fraying
Unlike woven mesh, there are no interlaced wire crossings. The monolithic sheet structure prevents wire breakage and particle contamination during long service life.

Typical Applications

• Laboratory & analytical testing: Precision test sieves for particle size analysis

• Medical industry: Micro fluid filters, drug delivery screens, nebulizer meshes, blood filtration components

• Automotive: Fuel injector filter screens, oil filter elements, acoustic speaker grilles

• Food & beverage: Coffee filter mesh, food strainers, sanitary filtration screens

• New energy: Electrode mesh for fuel cells and water electrolysis

• Industrial filtration: Gas / liquid separation, hydraulic strainers, chemical processing screens

• Electronics: Dust-proof acoustic mesh, EMI shielding mesh

Design Limitations & Notes

Wet chemical etching is isotropic, lateral undercut must be compensated in CAD design. Minimum hole diameter is generally limited by substrate thickness. For ultra-fine high-aspect-ratio apertures, electroforming can be selected as an alternative solution. Etched mesh is a solid sheet with etched openings, so tensile strength is lower than heavy woven mesh for heavy load filtration scenarios.