Gantry Plating Line · PNL / PPN / PTT / PPT
Overhead flight-bar copper, nickel and tin lines built around cross-nozzle side spray and 3-D oscillation - the fluid mechanics that decide whether a 0.10 mm hole, 4 mm deep, plates through or voids.
A gantry line holds the panel still while it plates. That single difference is why high-aspect-ratio work still runs on flight bars rather than on continuous conveyors.
A vertical continuous plating (VCP) line moves panels at constant speed past fixed cells. A gantry line picks the panel up with a flight bar, lowers it into a tank, and leaves it there for as long as the recipe requires - swinging, vibrating and spraying from both sides the whole time. Nothing is time-limited by conveyor speed.
That is the decisive advantage once aspect ratio passes about 15:1. In a deep, narrow hole the electrolyte inside the hole is not refreshed by bulk flow; it is refreshed by pressure at the hole mouth and by motion of the panel relative to the solution. A gantry gives you both, for minutes at a time. A conveyor gives you a few seconds of nozzle contact.
At 40:1, the copper ion concentration at the bottom of the hole collapses before the surface is anywhere near its target thickness. The deposit then either stops growing (void) or grows at a fraction of the surface rate (thin bottom, unreliable barrel). Three variables control whether that happens:
Everything below is an answer to one of those three.
Two opposed nozzle rails fire across the panel face at an angle rather than straight on. The opposing jets form a shear layer that sweeps the hole mouth instead of stalling in front of it, so exchange happens at the hole, not on the surface.
4 x 5 HP permanent-magnet pumps, 800 L/min each, each on its own VFD up to 200 Hz; 2-2.5 L/min per nozzle, uniform across the panel.
Independent swing on every copper tank with a stroke of 100 mm or more, plus a vibration motor on each V-block at 20 mm/s or above. The two axes are not synchronised, so the angle of attack at the hole changes continuously instead of settling into a standing wave.
Result: a thinner, unstable boundary layer and a much shorter path for fresh electrolyte to reach the hole bottom.
Pulse rectification lets the deposit be levelled cycle by cycle: a short high-current pulse drives copper into the hole, the reverse or off period lets the surface diffusion layer recover. Rectifiers follow the number of plating cells, one per cell.
Water-immersed V-seats are used so that high pulse voltage does not arc at the contact - a detail that only matters once you run pulse at scale.
Insoluble IrO2-coated titanium mesh combined with a copper dissolution tank holds the anode area constant over a long production run, so current distribution does not drift as the bath ages.
Anode mesh with 0.2 mm pores acts as a physical barrier against anode slime; without it, copper particles and hole-wall nodules become a yield problem rather than a chemistry problem.
| Parameter | Range / standard |
|---|---|
| Panel size | per customer requirement; tank length and height follow the panel |
| Panel thickness | 0.1 mm and up on the standard transport; thinner cores engineered per project with a carrier |
| Aspect ratio, validated | up to 40:1 |
| Copper thickness per pass | 5 - 30 µm |
| Heavy copper | 120 µm and above; the achievable range is agreed against your URS and proven on a coupon |
| Throwing power | ≥ 85% |
| Line speed | 0.3 - 2.0 m/min, recipe controlled |
| Tank length modules | 1,300 / 1,400 / 1,500 mm (1,500 mm with side spray) |
| Tank height | board height + 300 mm (+350 mm with bottom spray) |
| Agitation | cross-nozzle side spray + swing ≥100 mm + vibration ≥20 mm/s |
| Panel handling | automatic insert-frame loading and unloading at both ends |
| Anode | insoluble IrO2/Ti mesh with Cu dissolution tank, or soluble copper with anode bags |
| Rectification | pulse or DC, one rectifier per plating cell |
| Tank materials | PP / PVDF / SUS316L to suit the chemistry |
| Control | PLC + HMI, recipe management, alarm and trend logging |
Aspect-ratio capability depends on hole diameter, board thickness, chemistry and the copper thickness target. The 40:1 figure was reached with a specific stack-up and chemistry; the guarantee for your board is established in a pilot run, not assumed from a table.
Both ends of the panel range get as much attention as the middle: thin cores run on the standard transport down to 0.1 mm, and anything thinner is engineered with a carrier. At the top end, heavy copper of 120 µm and above is quoted against the range your board actually needs, proven on a coupon rather than assumed from a table. Insert frames are loaded and unloaded automatically at both ends, so no operator lifts a loaded frame by hand.
Gantry lines with this agitation package are installed and in mass production at two tier-1 HDI manufacturers producing high-layer-count AI accelerator and GPU baseboards, where 0.10-0.15 mm holes run through 4 mm of dielectric and copper. At both sites the 40:1 aspect ratio has been verified in mass production, not demonstrated on a coupon.
Across the wider product range, 357 machines were delivered between September 2021 and May 2026, 122 of them pattern plating and 41 panel plating lines. See the delivery record.
| Code | Line | When it is the right choice |
|---|---|---|
| PNL | Panel Automatic Plating Line | Full-panel DC copper for standard through-hole boards |
| PPN | Pulse Panel Automatic Plating Line | Panel copper at high aspect ratio, where DC cannot hold thickness distribution |
| PTT | Pattern Automatic Plating Line | Pattern copper followed by tin, DC |
| PPT | Pulse Pattern Automatic Plating Line | HDI and thick boards - pattern copper and tin with pulse copper |
Model codes describe the process, not the transport. Any of the four can be supplied as an overhead gantry line, a VCP line or an elevator-rotary line, depending on panel size, output and floor space.
Yes - provided electrolyte exchange inside the hole is the design target rather than an afterthought. Cross-nozzle side spray, per-tank swing and V-block vibration keep fresh copper at the hole bottom; the pulse rectifier shapes the deposit. The 40:1 figure has been verified in mass production at two tier-1 HDI fabs. For a specific stack-up we set the guarantee from a pilot run.
DC is sufficient for panel plating to roughly 10:1 with conventional chemistry. Above that, and for HDI with microvias and blind holes, pulse with recipe software gives better thickness distribution and less surface-to-hole variation. Both are quoted; the rectifier count follows the number of plating cells.
We do not quote a catalogue maximum. Panel size follows your requirement: tank length is modular at 1,300 / 1,400 / 1,500 mm and tank height follows board height plus 300 mm (plus 350 mm with bottom spray), so the line is built around the panel you need to run.
Cycle time is set by plating time in the copper cell, not by line speed alone. We compute m²/hour from board size, boards per flight bar, plating time and transfer time, then size the copper cell count to your target output. Send the stack-up and target and we return the cell count.
Send us your stack-up - hole diameter, board thickness, copper target and required m²/hour - and we will return a cell count and a pilot-run plan.