Method of modification of documents, especially paper documents, books, archive documents and others sheet materials

摘要

It describes the method in which the documents are subjected to repeat cyclic exposure the right or supersaturated solution modifying agent in enclosed chamber to achieve 30% moisture, preferably up to 12%. Subsequently, the leaves of document are pressed for more than 24 hours, preferably 20 to 60 s and dried until the moisture max. 7%. This cycle is repeated until a coating weight of 0.5 to 6 kg of solution to 1 kg of absolutelly dry document or until the pH range 7 to 8.5, or alkaline reserve in the range 0.5 to 2.5% CaCO3 equivalent.