Photochemical metal sheet etching is a noncontact cold subtractive manufacturing process, which transfers design graphics onto thin metal sheets through photolithography, and selectively removes unwanted metal material by controlled chemical dissolution. This technology can produce complex twodimensional structures, microhole arrays, fine gratings, shims, filter meshes and functional decorative patterns without hard stamping moulds. As a trusted metal sheet etching manufacturer based in Shenzhen, Zhuolida has decadeslong experience in precision photochemical etching, delivering onestop custom solutions from prototype sampling to massvolume serial production for global industrial clients

Traditional metal sheet processing technologies including mechanical stamping, laser cutting and CNC punching have obvious limitations for highend thinsheet component production. Stamping will introduce mechanical stress, burrs and sheet warping, especially for foils below 0.5 mm thickness; frequent mould wear brings unstable dimensional consistency in mass production. Laser cutting creates heataffected zones, edge oxidation and microcracks, which degrade flatness and surface quality of thin metal parts. CNC machining suffers high cost for largearea thinsheet workpieces and low efficiency for dense microfeature arrays. Metal sheet photochemical etching performed by Shenzhen Zhuolida avoids mechanical force and thermal damage, producing burrfree, stressfree components with high graphic fidelity and excellent batchtobatch repeatability.

Material Range & Core Technical Capabilities

Shenzhen Zhuolida supports photochemical etching for a wide portfolio of metal sheet materials. Common grades cover 304, 316L, 301 stainless steel, spring stainless steel, brass, beryllium copper, pure copper, aluminium alloy, titanium alloy, nickeliron alloy and other special engineering metal sheets

The applicable material thickness ranges from 0.03 mm up to 2.0 mm. The maximum processing panel size can reach 500 mm × 600 mm. Optimised process parameters enable dimensional tolerance down to ±0.005 mm, minimum feature width up to 0.02 mm, holeposition accuracy reaches ±0.0075 mm. Both piecebypiece sheet processing and rolltoroll continuous etching are available for highthroughput massproduction scenarios深圳市卓力.... Various feature types can be achieved in onestep forming: fullpenetration hollow patterns, partialdepth halfetching grooves, micropore arrays, encoder grating tracks, positioning notches, mounting holes and integrated logo patterns. Openarea ratio, slot width and outline contours can be flexibly adjusted simply by modifying photomask files, without expensive mould investment. Strict incoming material inspection is implemented: rolling scratches, oxide inclusions and surface contaminants must be eliminated, because tiny surface defects will turn into pattern distortion, broken slots or pinhole failures after chemical etching

StepbyStep Photochemical Etching Workflow for Metal Sheets

All manufacturing procedures are executed inside controlledenvironment production lines. Doublesided synchronous spray etching is widely adopted for thin metal sheet components to guarantee symmetrical feature geometry on both sides.

Sheet Cutting and MultiStage Precision PreTreatment Cleaning

Raw metal sheets or metal coils are cut to required processing panel dimensions. Continuous pretreatment line carries out alkaline degreasing, solvent rinsing and mild microetch surface activation. Rolling oil, fingerprints, passive oxide layers and surface particulate impurities are fully removed. Poor cleaning performance will lead to insufficient photoresist adhesion, triggering pattern peeling, missing features and local dimension deviation. Uniform surface activity across the whole sheet is the fundamental guarantee for stable etching performance in largebatch production.

BubbleFree DualSided DryFilm Photoresist Lamination

Photosensitive dryfilm photoresist is hotlaminated onto top and bottom surfaces of cleaned metal sheets. Lamination temperature, pressure and conveyor speed are precisely calibrated corresponding to sheet thickness. Microbubbles trapped between photoresist and metal surface will generate pitshaped defects and abnormal contour after etching. Doublesided lamination allows simultaneous etching from two sides, improves sidewall verticality of slots and holes, and ensures consistent quality for front and rear surfaces of finished parts.

HighAccuracy UV Exposure and Controlled Developing

Collimated ultraviolet light transfers complete CADderived graphic data via highresolution photomasks. The photoresist covering reserved metal regions polymerises under UV irradiation and forms stable protective mask layers. Unpolymerised photoresist located over etching areas dissolves inside alkaline developer solution, exposing bare metal waiting for chemical dissolution. Undercut compensation is embedded into photomask design. Since chemical etching is isotropic, uncontrolled lateral undercut will expand actual slot and hole dimensions, especially critical for ultrafine features on thin metal sheets.

ClosedLoop ConstantTemperature Spray Chemical Etching

Patternmasked metal sheets pass through automatic sprayetching chamber. Ferricchloridebased etching solution is evenly sprayed from upper and lower nozzle arrays. Exposed metal material is selectively dissolved until target depth or full penetration is completed. Etching liquid specific gravity, working temperature, nozzle pressure and conveying speed are managed by closedloop automatic control system. Homogenised sprayflowfield design prevents dimension difference between central area and edge area of largesize metal sheets. Process technicians balance vertical etching removal rate and lateral undercut magnitude, to make sure all features stay within drawing tolerance specifications.

Photoresist Stripping and MultiCycle HighPurity Rinsing

When etching procedure finishes, alkaline stripping agent completely removes cured photoresist mask from metal sheet surface. Multistage highpressure circulating rinsing combined with ultrasonic cleaning washes residual corrosive etchant away from slots, microholes and sheet surface. Trapped chemical residues will cause spot rusting and surface contamination during endproduct service life.

CustomOriented PostTreatment Operations

Posttreatment options vary according to application requirements. Common processes include passivation for improved corrosion resistance, precision flatness correction, ultrasonic deep cleaning, visual presorting. Unlike stamped or laserprocessed metal parts, photochemicallyetched metal sheet components naturally deliver burrfree inner walls and smooth edges; secondary deburring is unnecessary. Optional secondary surface treatments are available, such as electropolishing, PVD coating and painting to meet decorative or anticorrosion requirements.

MultiDimensional Strict Quality Control & Inspection

Key inspection items include featuresize consistency, position accuracy, flatness, outline dimension, openarearatio verification and surface cosmetic examination. Automated optical inspection (AOI) with highmagnification microscopy detects broken ribs, block holes and tiny pattern defects. Sampling reliability tests contain saltspray corrosion test, thermal cycle ageing test and vibration simulation test for automotive, medical and industrialgrade orders. Qualified sheets go through final precision diecutting and dustproof packaging before shipment

Core Advantages of Shenzhen Zhuolida Metal Sheet Etching Service

First, burrfree and stressfree finished quality. As cold chemical subtractive manufacturing, photochemical etching applies no mechanical impact and no thermal load. Thin metal sheets maintain excellent flatness after processing, without deformation and residual stress, which is vital for precision sensing, optical and fluidcontrol components.

Second, outstanding design flexibility and low prototyping cost. There is no requirement for expensive hard moulds. New product validation only needs updating photomask files, greatly shortening sample leadtime and supporting fast design iteration. Both lowvolume prototype orders and largescale massproduction can be handled efficiently.

Third, excellent batchtobatch repeatability. Graphic features are reproduced by photomask. Multiple workpieces can be arranged on one processing panel. Dimensional stability is wellcontrolled in massvolume production, complying with ISO9001, IATF16949 qualitymanagement standards for automotive and industrial supplychain demands

Fourth, powerful processing capability for ultrathin metal sheets. Mechanical stamping and laser cutting encounter great difficulties for foils under 0.1 mm. Zhuolida’s metal sheet etching realises intact complex microstructures on ultrathin sheets, expanding design possibilities for miniaturised modern equipment.

Main Industrial Application Fields

Custometched metal sheet parts manufactured by Shenzhen Zhuolida are widely supplied across multiple highend industries: automotive interior decorative meshes and sensor components, medical filter elements and surgical accessories, optical encoder discs and aperture sheets for precision instruments, electromagnetic shielding parts for consumer electronics, flowcontrol components for newenergy equipment, semiconductorrelated precision thinsheet components, industrial filter screens, shims and spacer gaskets

Key Process Challenges and Control Points

Isotropic undercut effect is the main technical challenge for metal sheet etching. Accurate photomask compensation plus stable etchingsolution parameters are essential to keep featuredimension accuracy. For parts mixed with wide slots and ultrafine narrow features, uneven etching load may cause dimension drift, requiring graphic optimisation and homogenised sprayflowfield configuration. Microholes and narrow gaps are easy to trap etching byproducts, multiround ultrasonic cleaning and strict workshop cleanliness management must be maintained. Incomingmaterial quality management is the first barrier against pattern defects.

Conclusion

Photochemical metal sheet etching has become an irreplaceable processing solution for highprecision thingauge metal components. Compared with stamping, laser cutting and CNC punching, this coldprocessing technology achieves complex, burrfree, stressfree structures on various metal sheets. As a professional metal sheet etching manufacturer in Shenzhen, Zhuolida combines rigorous incomingmaterial screening, precise undercut compensation, closedloop etchingparameter stabilisation and complete multidimensional qualityverification workflow. The company delivers reliable custometched metalsheet parts for automotive, medical, electronics, semiconductor and newenergy customers worldwide. As modern manufacturing keeps pursuing miniaturisation, higher precision and complex microstructures, photochemical metal sheet etching will continue expanding its application scope in advanced industrial sectors.