I ran into this question on Lifehacks.SE, regarding how to remove wrinkles from a crumpled piece of paper. Suggestions included ironing the paper or placing it under some heavy books for a few days.
I am wondering about the chemistry of these processes and whether they are actually effective. This Reddit thread gives some general background about the molecular structure of paper and what happens when you fold paper with enough force to permanently create folds, i.e. to break bonds (as opposed to rolling it within the "elastic boundaries", as it says there). See also this excellent infographic from Compoundchem.
So, can ironing\applying pressure really straighten out a folded paper back to factory level? If not, is there any other way to unwrinkle a paper?
I'd appreciate explanations in the molecular level.