Precision in Every Step
From in-house base shell manufacturing to final inspection — our integrated facility delivers consistent quality cylinder after cylinder.
The Engraving Process
Six meticulous stages transform raw steel into precision gravure cylinders.
Base Shell Manufacturing
The process begins with in-house base shell manufacturing — a core capability that sets us apart. Premium-grade seamless steel tubes are precision-turned to exact diameter and length specifications. Each shell undergoes rigorous dimensional verification to ensure concentricity within ±0.01 mm. The steel body is machined with end journals matching your press requirements, creating a perfectly balanced foundation for the engraving process.
- Seamless steel tube selection (ST52 / E235 / 42CrMo4)
- Precision CNC turning to specified diameter and length
- End journal machining to client press specifications
- Concentricity verification (±0.01 mm tolerance)
- Surface preparation to Ra 0.4 μm finish
Copper Plating
The prepared steel shell undergoes thorough chemical cleaning and degreasing before entering our automated electrolytic copper plating line. A uniform copper layer of 350–500 microns is deposited, creating the ideal engraving surface with consistent grain structure and optimal hardness. The copper-plated surface is then precision-ground and polished to a mirror finish (Ra 0.2 μm), ensuring clean, defect-free engraving.
- Shell inspection and dimensional verification
- Degreasing and chemical surface preparation
- Electrolytic copper plating (350–500 microns)
- Copper surface grinding and polishing to Ra 0.2 μm
- Copper layer thickness verification
Electro-Mechanical Engraving
The heart of our operation. Using computer-controlled electro-mechanical engraving machines from Ohio Gravure Technologies featuring Vision engraving heads with sub-micron accurate cutting, a precision diamond stylus cuts individual cells directly into the copper-plated surface. Each cell is independently controlled for depth and area, creating the exact ink-carrying volume specified for your application. Our Ohio Spectrum engravers operate at up to 2000 lines per inch for high-definition applications, with real-time depth monitoring, Vertex Stylus Monitoring System for consistent quality, and automatic stylus wear compensation.
- Diamond stylus engraving with real-time depth control
- Cell-by-cell modulation for continuous tone reproduction
- Screen rulings from 60 to 2000 lpi
- Automated calibration and stylus wear monitoring
- Engraving parameter verification against digital artwork
Chrome Plating
After engraving, the cylinder is hard-chrome plated to protect the engraved cells and extend press life. Our automated chrome plating line deposits 9–12 microns of hard chrome (700–950 HV) over the engraved surface. The chrome layer is then precision-polished to a mirror finish, preserving the engraved cell geometry while providing a durable, corrosion-resistant surface capable of withstanding millions of impressions.
- Hard chrome plating (9–12 microns, 700–950 HV)
- Chrome surface polishing to mirror finish
- Chrome thickness measurement and verification
- Surface roughness verification (Ra 0.1 μm)
- Cell integrity inspection post-chrome
Proofing & Print Sampling
Before final certification, every engraved cylinder undergoes a proofing run on our in-house proofing press. A sample print is produced using the actual ink and substrate specified for the production run. Color bars are measured with a spectrophotometer to verify density, dot gain, and trap values. Registration accuracy is confirmed across the full print width, and any defects are identified and corrected before the cylinder is released for delivery.
- In-house proofing press run with production ink and substrate
- Spectrophotometric color bar analysis (density, dot gain, trap)
- Registration accuracy verification across full print width
- Visual inspection of continuous tone and halftone reproduction
- Correction and re-proof if required before certification
Quality Inspection & Delivery
Every completed cylinder undergoes comprehensive quality inspection before release. Cell depth is measured with a calibrated profilometer at multiple points across the cylinder surface. Visual inspection under 50x–100x magnification detects any surface defects. Dimensional verification confirms diameter, concentricity, and runout meet press specifications. Approved cylinders are carefully packaged with corrosion-inhibiting materials and dispatched through our specialized logistics network.
- Cell depth measurement with profilometer (±1 micron accuracy)
- Visual inspection under 50x–100x magnification
- Dimensional verification (diameter, concentricity, runout)
- Chrome hardness testing (700–950 HV verification)
- Final quality certificate generation
- Protective packaging and logistics coordination
Quality Assurance
Every cylinder undergoes rigorous inspection at multiple stages to ensure it meets our exacting standards.
Cell Depth Measurement
Profilometer analysis ensures each cell meets specified depth tolerances within +/-1 micron.
Surface Inspection
Visual inspection under 50x-100x magnification to detect any surface defects or irregularities.
Dimensional Verification
Precise measurement of diameter, concentricity, and runout to ensure press compatibility.
Proofing / Print Sample
Test print run on actual substrate to verify color bars, registration, and ink transfer quality before certification.
Technology & Equipment
Our facility houses the latest generation of engraving and plating equipment from world-leading manufacturers.
Ohio Gravure Technologies
Ohio Spectrum and Prism engravers with Vision engraving heads — sub-micron accurate cutting system with 2000 lpi capability, Hybrid Engraving technology, and real-time depth control.
Automated Inspection
Profilometers and microscopic inspection systems for cell depth verification and surface quality analysis.
Precision Plating
Automated copper and hard-chrome plating lines with controlled thickness deposition and uniform coverage.