The influence of consistency and fibre length on the yield stress of OCC pulp fibre suspensions

Cai, Hui; Yuan, Zhaoyang; Zhang, Xin; Shen, Jun; Zhang, Hui; Olson, James A.

doi:10.15376/biores.12.4.8368-8377

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…Unlike virgin fibers directly made from wood or other lignocellulosic materials, recycled OCC is associated with several challenges in the papermaking process because of material variability and relatively lower strength due to the hornification of fibers [4][5][6] . These challenges have left OCC pulp paper mills desperate for any way to improve the quality of the pulp and final products.…”

Section: Introductionmentioning

confidence: 99%

High Performance of Paper Strength and Energy Savings in OCC Pulp Papermaking via MFC Addition

Cai¹,

Sha²,

Lu³

et al. 2023

Paper and Biomaterials

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Fiber screen fractionation of recycled old corrugated container (OCC) pulp and subsequent targeted processing of each fraction can lead to higher fiber quality, more uniform pulp, and increased handsheet strength and surface smoothness. This pilot-scale study evaluates the benefits of fiber fractionation using a pressure screen prior to low consistency (LC) refining. A 0.81-mm smooth holed screen cylinder is utilized, and two refiner plate patterns are adopted (wide 0.99 km/rev BEL and interim 2.01 km/rev BEL).Here, LC-refined reject fractions are mixed with the created microfibrillated cellulose (MFC), and the mixed pulp and paper qualities are compared with no-MFC OCC pulps. The results indicate that the highest tensile strength of the handsheet is obtained by the addition of MFC to the fractionated refined OCC pulp compared to the unfractionated refined OCC and primary OCC pulps at a given specific energy. Furthermore, the experimental approach adopted in this study can be used to optimize recycled OCC pulping systems.Overall, the results indicate that fractionated LC refining plus MFC addition provides higher pulp and paper qualities and the potential for saving energy to reach the desired tensile strength of the OCC pulp.

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Section: Introductionmentioning

confidence: 99%

High Performance of Paper Strength and Energy Savings in OCC Pulp Papermaking via MFC Addition

Cai¹,

Sha²,

Lu³

et al. 2023

Paper and Biomaterials

Self Cite

View full text Add to dashboard Cite

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Insight into fractionation performance of American old corrugated containers pulp in pressure screening

Cai

Zhang

Zhu

et al. 2019

Nordic Pulp &Amp; Paper Research Journal

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In this work, the American Old Corrugated Containers (OCC) pulp was screened using pressure screen to investigate the factors affecting the fractionation performance. Three screen cylinders with different geometries, aperture size/contour heights, volumetric reject ratios, and aperture velocities were used. The results showed that the passing ratio of fibres increased with the increase of contour height, volumetric reject ratio, and aperture velocity for all the three screen cylinders. Moreover, among the three cylinders investigated, the 0.81 mm hole cylinder achieved the highest fractionation efficiency with a volumetric reject ratio of 0.1 followed by 0.15 and 0.2 mm slot screens. Freeness change of the accept side of the screen was similar to passage ratio, which shows an increasing trend with the increasing aperture velocity and volumetric reject ratio. However, the reject freeness showed decreasing trends with the increasing aperture velocity {V_{s}} and volumetric reject ratio {R_{v}}.

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Alkaline treatment and fractionation of OCC for strength improvement

Hossen,

Rahman,

Islam

et al. 2024

Nordic Pulp &Amp; Paper Research Journal

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The main drawback of recycled fibers is the deterioration of fiber bonding dependent papermaking properties (like tensile, tear and burst indexes) due to the hornification effect, as a results of drying during papermaking. In order to improve the papermaking properties through increasing fiber bonding, an alkaline treatment of Old Corrugated Cardboard (OCC) followed by fractionation were carried out in this investigation. Alkaline treatment dissolved 6.6 % organics (carbohydrates and lignin) and fibers became wider as a results of fiber swelling. The alkali treatment decreased fines from 39.9 % to 28.5 %, consequently, decreased drainage resistance from 26 °SR to 21 °SR. The papermaking properties of OCC pulp increased on alkaline treatment. Fiber fractionation of alkaline treated OCC further increased papermaking properties. At 40 °SR value, the tensile index, burst index and tear index of alkaline treated longer fiber fraction was 49 N m/g, 3.2 kPa m2/g, 7.2 mN m2/g, respectively while it was 40.4 N m/g, 2.1 kPa m2/g and 6.1 kPa m2/g, for non-treated longer fiber fraction, respectively.

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The influence of consistency and fibre length on the yield stress of OCC pulp fibre suspensions

Cited by 4 publications

References 17 publications

High Performance of Paper Strength and Energy Savings in OCC Pulp Papermaking via MFC Addition

High Performance of Paper Strength and Energy Savings in OCC Pulp Papermaking via MFC Addition

Insight into fractionation performance of American old corrugated containers pulp in pressure screening

Alkaline treatment and fractionation of OCC for strength improvement

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