Protect and Survive!
If you want your documents to survive, then lamination is the answer. Each sheet is heat sealed into a tough plastic pouch. That makes it waterproof, dirt proof and even child proof!
In 4 roller machines one set of rollers heat and another set compress - this gives a better finish than 2 rollers which do both together.
But even the best machine will give poor results with poor quality pouches! Always use good quality branded pouches for best results.