Quoting from an article written by Kelsey Mckinney in the New York Times:
Recently, someone wrote to Mary Oey, a conservator at the Library of Congress, asking for help archiving her father’s personal papers. He was a Holocaust survivor, and he had used his diaries and papers as primary sources to teach schoolchildren about his experience. He had laminated them to keep them safe, and — Ms. Oey gave a mournful sigh as she told this story — lamination is a terrible way to preserve documents. There was no way to save this patron’s history.
“The only way to extricate paper from lamination is to use lots of solvents to dissolve the plastic,” Ms. Oey said. “Some stiffer laminations, we don’t know how to get off, and it doesn’t protect the document. The lamination itself can ruin a document beyond repair.”