IODINE GAS PHASE DYING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for adding iodine to polyvinyl alcohol(PVA) present in paper. SOLUTION: Paper added with PVA and iodine are put in a closed vessel and kept at constant temperature for a constant time, and by adding vaporized iodine to the PVA in a gas phase, the iodine is added to the PVA in the paper without changing paper layer structure.