Issue link: https://iconnect007.uberflip.com/i/1428512
76 PCB007 MAGAZINE I NOVEMBER 2021 e process engineer or operator creates a temperature profile following what the lami- nate or prepreg manufacturer recommends on the datasheet of the material. Once this pro- file is transferred to the InduBond s ystem, the computer, control, temperature sensors, and power driver work together to make the real temperature of the material track the pro- grammed temperature profile very precisely. e soware does the same for all other set- tings, such as vacuum, hydraulic pressure, lami- nation pressure, and all other process param- eters. All the data during the lamination process is logged in a database and associated with a dedicated work order. Once the heating section of the cycle is over, the vacuum chamber is pressurized. e developed cooling system cre- ates a specific loop of airflow with a specific ΔT that crosses through the edges of the press stack separator plates. When the cold air touches the sep- arator stainless steel, energy is exchanged. In other words, the air takes heat from the plates increasing the air tem- perature while the separator plates become a bit cooler. e air is then pulled by the blow- ers and conducted to a water/ air exchanger that cools down the air again before the blow- ers push it back to pass through the press stack again. e sys- tem recirculates the air inside the chamber. Summary Table 1 provides a compari- son of electromagnetic induc- tance lamination with conven- tional external heating lamina- tion technologies. PCB007 References 1. Multilayer Press Technology Using Magnetism to Produce Lamination Heat, by Victor Gallego, PCB007 Magazine, October 2019. 2. Biot-Savart Law, gsu.edu. 3. Eddy Current Loss, circuitglobe.com. Happy Holden has worked in printed circuit technology since 1970 with Hewlett-Packard, NanYa/Westwood, Merix, Foxconn, and Gentex. He is cur- rently a contributing technical editor with I-Connect007, and the author of Automation and Advanced Procedures in PCB Fabrication, and 24 Essential Skills for Engineers. To contact Holden or read past columns, click here. Table 1: Summary of the differences between standard heating methods and the electromagnetic inductance-based system. (Source: Chemplate)