| 초록 |
Usually, the papermaking machine speed has ever been increasing to comply with the demand of higher productivity under maintaining high quality of paper. An increase in machine speed enhances two major hydrodynamic factors affecting sheet formation, namely turbulence and shear. To analyze the relationship between wet-end chemistry and machine speed, general and optical properties of the sheet and stock made from machine speed variation, such as retention ratio, draw values, amount of wet-end chemicals applied, opacity, tensile strength, amount of drier stream, water and oil absorbency are measured. In order to explain the filing and binding mechanisms of the fines from filler, fiber and their aggregates, SEM analysis is also discussed. As a result, the paper quality is not sufficient at the machine speed of over 1200m/min. |
