PAPER FOR FILE HOLDER AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a paper for a file holder having low areal weight, produced by using less amount of vegetable fibers and having sufficiently high stiffness and strength and good punchability. SOLUTION: The file holder paper has a surface layer/inner layer structure or a surface layer/inner layer/surface layer structure and is produced by a multi-layer paper-making process. The surface layer has a density of 0.65-0.95 g/cm3 and the inner layer contains thermally expansible particles and has a density of 0.2-0.5 g/cm3.