국산 리파이너 플레이트의 강도 차이에 따른 침엽수 표백크라프트 펄프의 물성 변화 연구

Abstract

Refining in stock preparation is done by two separate intensities such as gentle and harsh refining. If the optimum intensity during refining is applied to pulp fibers, a great quality of paper can be produced with reduced operating costs. Softwood bleached kraft pulp (SwBKP) was used to evaluate the effects of refining intensity on pulp and paper properties. The plates with two different fillings for the study was designed and casted by the research team in Korea. Harsh refining used the plate with coarser fillings (cutting edge length = 354.5 m/rev) and gentle refining did the one with finer fillings (cutting edge length = 829 m/rev). Both harsh refining and gentle refining of SwBKP representatively displayed a similar drop in freeness at the same amount of refining, even though more fines and shorter fibers were generated by harsh refining. However, gentle refining developed greater strength properties of paper than did harsh refining, while paper bulk was more reduced in gentle refining. In conclusion, more finer plate fillings is required to develop pulp and paper properties faster than the conventional ones without reducing a stock flow rate during refining.