This image from the 1980’s shows Forest Products Laboratory (FPL) employee Vance Setterholm standing at the reel end of the paper machine in FPL’s pilot plant. He’s inspecting a corrugated container made from press-dried paper.
Press-dry papermaking was developed at FPL as a method to produce strong paper from 100% hardwood pulp. The process simultaneously applies heat and pressure to a web of wood fibers, and can also be used with softwood pulps to improve paper strength and smoothness.
During this time, FPL had the capability to start with a log and end up with a finished corrugated container, giving researchers the ability to study all the processing effects on the end product.