[논문]Effect of Combined Refining Plates with Different Bar Angles on Paper Properties during Mixed Pulp Refining

GUO, Xiya; DONG, Jixian; LIU, Huan; DUAN, Chuanwu; YANG, Ruifan; QI, Kai

doi:10.5658/wood.2020.48.5.581

Effect of Combined Refining Plates with Different Bar Angles on Paper Properties during Mixed Pulp Refining 원문보기

목재공학 = Journal of the Korean wood science and technology, v.48 no.5, 2020년, pp.581 - 590

GUO, Xiya (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) , DONG, Jixian (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) , LIU, Huan (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) , DUAN, Chuanwu (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) , YANG, Ruifan (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology) , QI, Kai (College of Mechanical and Electrical Engineering, Shaanxi University of Science & Technology)

Abstract ▼ AI-Helper

Pulp refining is the major way to alter the properties of fibers and formed paper. Different combinations of the bar profile of the rotor and stator during low consistency refining processes directly affect the properties of the paper. In this study, a mixture of softwood and hardwood pulp was refined by varying the bar angle of the stator while that of the rotor is fixed at 0º. The pulp samples were collected at different refining times. Then, the pulp and paper properties, such as beating degree, fiber external fibrillation, and tensile and tear indexes were measured to explore the effects of the combined refining plates at different bar angles on paper properties. The results of the experiment show that the combined refining plate of 0º and 5º recorded the most significant improvement in the pulp beating degree and fiber external fibrillation. This consequently increased the fiber bonding area, which in turn, improved both the tensile and the tear indexes of the paper. Also, the influence of the combined refining plates with a larger bar angle on the paper properties was weaker compared to that of smaller angles. This study not only provides ideas for the bar profile design but also improves the optimal selection of refining plates.

주제어

표/그림 (11)

그림 Fig. 1. The MD3000 SD refiner.
표 Table 1. Details of fiber raw materials used in refining
표 Table 2. The bar parameters of four stator plates
표 Table 3. Common bar parameters of all plates
그림 Fig. 2. The beating degree changes of samples refined by four combined plates over the refining time.
그림 Fig. 3. The fiber external fibrillation of pulp samples refined by four combined plates over the refining time.
그림 Fig. 4. Morphology of fibers (2kx) with Disc 1(a), Disc 2(b), Disc 3(c) and Disc 4(d) after refining for 6 min.
그림 Fig. 5. Morphology of fibers (2kx) with Disc 1(a), Disc 2(b), Disc 3(c) and Disc 4(d) after refining for 20 min.
그림 Fig. 6. Bulk of handsheets made by pulp refined by four combined refining plates.
그림 Fig. 7. Variation of the tensile index of paper made by the four combined refining plates.
그림 Fig. 8. Tear index change of paper formed by the four combined refining plates.

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가설 설정

1. When the mixed pulp composed of unbleached softwood and bleached hardwood pulp was refined, the change of beating degree of pulp was greatly influenced by the bar angle of the combined refining plates. And the combined refining plates with smaller bar angles increased the beating degree of pulp faster and more significantly.
2. Under the condition of constant bar angle of the rotor, the smaller bar angles of the stator was, the faster fiber cutting was. And the fiber external fibrillation of pulp samples refined by the combined refining plate with smaller bar angle was more obvious compared to others.

제안 방법

In this study, softwood and hardwood mixed pulp was refined by combined refining plates with different bar angles. And the pulp and fiber properties (pulp beating degree and fiber external fibrillation) of pulp samples, and paper properties (the bulk, tensile and tear index, and the micro morphology) of the handsheets were analyzed to clarify the effects of the combined plates with different bar angles on paper properties.
The increase of fiber external fibrillation can not only strengthen the fiber bonding force, but also improve the strength of formed paper, such as tensile and tear strength (Liu, 2008; He, 2010; Strachan, 1938; Kang, 2007; Clark, 1969; Jayme and Hunger, 1957). In this study, it was measured by fiber quality analyzer indicating the projection area of the fibrils in relation to the projection area of the entire object, scaled into a percentage. The fiber external fibrillation of pulp samples refined by the four combined refining plates were analyzed, and there was a difference in the external fibrillation changes of the pulp samples refined by them, as shown in Fig.
In this study, mixed pulp of bleached hardwood pulp and unbleached softwood pulp was used in the ratio of four to one, and it was soaked in water for 4 h before refining. The detail of the pulp properties are shown in Table 1.

이론/모형

The beating degree of the pulp samples was measured with Schopper-Riegler (oSR) tester as per ISO 5267-1:1999 method (1999), morphology of formed papers at different time was observed by Scanning Electron Microscopy (SEM), and the fiber fibrillation was analyzed by fiber quality analyzer (FS5, Valmet, Espoo, Finland).

성능/효과

3. Combined refining plates with smaller bar angle showed a better ability to improve paper physical properties. When the pulp was over refined, the fiber was over shorted, therefore the fiber bonding force would be changed.
3. The straight bar plate with bar angle of 0º was fixed as the rotor, and different combinations of refining plates were achieved by changing the refining plates (stator) with different bar angles, such as 0º, 5º, 22º and 50º.
3. The fiber external fibrillation of the pulp samples was enhanced with the progress of the refining, while the change ability on fiber external fibrillation of Disc 2 is strongest, which increased the fiber external fibrillation from 6.32% to 15.09%, with a change rate of 0.439% over time. And the change rates of fiber external fibrillation for Disc 1, Disc 3, and Disc 4 over time were 0.
, 2014). Therefore, it can be concluded that the fibers refined by the combined refining with a smaller bar angle were more likely to produce external fibrillation, increase the specific surface area of the fibers.

참고문헌 (30)

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원문보기 상세보기
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