Dense smooth foil stackups require synchronized vacuum press cycles and high-resin fine-glass prepregs to prevent micro-cavity voids and dielectric starvation.
Predictive squeeze flow modeling couples chemorheology and layout copper density to prevent microvia voiding, trace swimming, and dielectric thickness drift.
Sub-stack thickness drift stems from secondary resin compression during sequential lamination, requiring flow-controlled prepregs and thieving arrays to hold Z-axis impedance.
Dynamic lamination rheology control via 2.0-2.8°C/min platen ramp rates minimizes glass bundle tilt and resin squeeze-out to hold sub-picosecond phase skew.
Subassembly press hydraulic parallelism and thermal ramp control determine resin distribution, eliminating dielectric height variation and differential signal phase skew.
Non-Newtonian resin flow inside thin prepreg micro-channels governs void formation, trace displacement, and dielectric thickness stability during high-pressure lamination.
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