Staging hydraulic lamination pressure and damping heating rates above dynamic viscosity minimums prevents hydrodynamic resin shear from displacing heavy copper inner conductors.
Heavy copper selective soldering balances thermal immersion against rapid dissolution by controlling nozzle drag velocity and bath copper saturation levels.
Nitrogen inerting below 100 ppm O2 lowers surface tension and prevents dross, enabling 100% IPC Class 3 barrel fill on heavy copper power boards.
Heavy copper lamination shear stress stems from CTE mismatch and trace height steps, requiring controlled press ramps, high-resin prepregs, and optimized surface treatments to prevent delamination.
Optimizing barrel fill on high thermal mass boards requires thermal relief geometries, elevated topside preheat, and controlled alloy contact duration.
Shear forces during vacuum pressing shift heavy copper traces when resin flow velocity exceeds interfacial bond strength, requiring optimized aspect ratios.
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