섬유의 손상이 적은 한지 제조 (제3보) - K₂CO₃증자하여 제조한 한지의 열 열화특성 - ( Manufacturing of Korean Trdaitional Handmade Paper with Reduced Fiber Damage (III) - Durability of Handmade Paper Prepared by Potassium Carbonate Cooking under Heat Aging - )