Reducing Resin Demand in Vacuum Infusion Through PMI Foam Cell Structure
Introduction: Medium-cell PMI foam can improve material efficiency through lower resin uptake, lighter panels, and more controlled processing. Material efficiency in composite manufacturing is often discussed through density, strength, or curing temperature. Resin uptake deserves equal attention. When resin enters a foam core beyond what is needed for reliable bonding, the added mass can increase material consumption, handling effort, and the operating burden of the finished structure. The environmental case therefore begins with a manufacturing question: can the core perform its structural role while limiting unnecessary resin use? This question is especially relevant to vacuum infusion, VARI, and RTM production, where the exposed cells created by cutting or machining can influence how resin moves into the core. The answer is not a universal preference for the lowest-absorption material. A responsible assessment must balance resin demand, bond quality, mechanical performance, proces...