There is a photo that runs with every story about the AI buildout: rows of server racks, blue lights, a cold aisle disappearing into the distance. Nearly everything in that photo that carries a signal was consolidated under heat and pressure in a lamination press, most of it under vacuum.
The chips get the headlines. The lamination step gets nobody's attention, right up until it becomes the reason a shop cannot hold yield on the panels everyone suddenly wants.
The hidden step in every server
AI infrastructure and its supply chain run on laminated product:
- Multilayer printed circuit boards, with climbing layer counts and lower-loss material systems
- Copper-clad laminate, the stock those boards start as
- PCB stators, board-built motor components now marketed for the cooling systems inside those same data centers
- Laminated insulation board in the power path
The common thread is a controlled press cycle. Layers go in, heat and pressure are applied on a schedule the material dictates, with vacuum where the process requires it, and a bonded panel comes out.
Where yield is won
A lamination cycle is a controlled system: pressure distribution, pressure timing, heating rate, cooling rate. Within that system, two factors do an outsized share of the work.
- Platen temperature uniformity. Resin flow, cure and final thickness all follow temperature. A platen that runs hot in the center and cool at the corners builds that gradient into every panel it touches, and low-loss and high-temperature resin systems can run narrower processing windows than standard FR-4. French's UNI-TEMP two-phase heat transfer platens attack exactly this: the technology distributes heat evenly enough that one standard single-zone controller runs the entire system, no multi-zone controls or banks of thermocouples required, while holding a steady temperature within ±3°C through controlled heating and cooling.
- Vacuum. Pulling the lay-up down under vacuum before and during pressure reduces trapped air and volatiles at the bond line, which cuts the risk of voids. Voids that survive lamination can contribute to delamination and reliability problems later, often during thermal cycling, and often in somebody else's failure analysis report.
We build presses around that whole cycle, not just those two variables. A documented example: the 32-ton vacuum lamination press French built for PCB development work(opens in new tab) runs high-temperature cycles with controlled heating and cooling rates, vacuum, stored recipes and full process-data collection. That is the level of control the newer material systems ask for.
Adding usable lamination capacity
Shops are being asked to quote more panels, bigger panels and tougher materials, often all at once. French offers two options to evaluate.
- A press engineered for the job. Panel format, pressure, temperature range, vacuum level, opening count, automation. A custom lamination press starts from what you actually run instead of what a catalog happened to offer.
- A rebuild of what you already own. Depending on inspection findings, scope and component availability, a rebuild can bring a proven press back toward original performance and add modern controls and data collection, often with less cost and downtime than replacement. Restoring existing capability and modifying a press for new requirements are different questions. Heating-system conversions, UNI-TEMP platen retrofits and control upgrades can extend what an existing frame handles; whether yours is a candidate is an engineering evaluation.
French has manufactured industrial machinery in Piqua, Ohio since 1900, and lamination presses joined the line with the TMP acquisition in 2009. If you build the boards and laminates the AI supply chain runs on, bring us your panel dimensions, material system, temperature requirements and your current production constraint. That is a conversation our press engineers genuinely enjoy.