Correlation Analysis for Fiber Characteristics and Strength Properties of Softwood Kraft Pulps from Different Stages of a Bleaching Fiber Line

Lin, Benping; He, Beihai; Liu, Yanlan; Ma, Lefan

doi:10.15376/biores.9.3.5024-5033

Cited by 16 publications

(14 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These relationships were highly significant and explained more than 81% of the total variation in tear index (Figure 4a). This close relationship between the zero-span breaking length and tear index is in good agreement with previous findings [5][6][7][8]51]. The difference between hardwood and softwood pulps is due to the impact of fibre length on the development of tear index.…”

Section: Impact Of Fibre Strength On the Development Of Paper Propertiessupporting

confidence: 92%

See 1 more Smart Citation

Effect of Press-Drying Parameters on Paper Properties

Koubaa¹,

Koran²

2018

Pulp and Paper Processing

View full text Add to dashboard Cite

This study investigates alternatives that can improve the internal bond strength (IBS) of paper by pulp refining and paper press-drying (PD). The improvement mechanisms of IBS and their impact on the strength development of high-yield pulps are discussed. All experiments were conducted using a factorial design where the factors were four pulp types (one spruce thermomechanical (TMP) and three chemi-thermomechanical (CTMP) from spruce, birch, and aspen), three refining levels, three PD temperatures and three pressures. The effects of these treatments on the physical and mechanical properties of paper were studied using an analysis of variance. Refining changed the fibre surface, thereby promoting mechanical adhesion. PD temperature softened the fibres and changed their surface chemistry, while PD pressure improved the contact area between fibres. These changes led to an important improvement in IBS which explained, to a large extent, the variations in paper properties. Compared to air-dried paper, PD paper showed much higher properties for most tested pulps at all refining levels. These results were due to the increase in bonded areas. PD at 175°C substantially improved the wet tensile strength of paper due to the flow of lignin on the fibre surface, which protects the hydrogen bonds from moisture.

show abstract

Section: Impact Of Fibre Strength On the Development Of Paper Propertiessupporting

confidence: 92%

“…Several studies [5,26,41,[44][45][46][47][48][49][50][51] demonstrated that during rupture in tensile testing of paper, some fibres pull out and others break. Beating weakens the fibres and the proportion of broken fibres during paper testing increases with the beating level.…”

Section: Impact Of Fibre Strength On the Development Of Paper Propertiesmentioning

confidence: 99%

Effect of Press-Drying Parameters on Paper Properties

Koubaa¹,

Koran²

2018

Pulp and Paper Processing

View full text Add to dashboard Cite

show abstract

“…In wood, fibers are mostly straight and it is known that fibers can become curlier in the unit processes along the fiber line, as the fibers are subjected to mechanical forces in for example pumps, pipes and screw presses (Courchene et al 2002;Joutsimo and Giacomozzi 2015;Koskinen et al 2009;Lin et al 2014;Page et al 1985). However, in the present study the pulps were oxygen delignified in autoclaves, with alkali, oxygen and only mixing by gentle kneading and shaking of the pulp, yet oxygen delignified pulps had much higher curl and kinks than kraft cooked pulps.…”

Section: Effect On Morphologymentioning

confidence: 99%

Differences and similarities between kraft and oxygen delignification of softwood fibers: effects on chemical and physical properties

Esteves¹,

Sevastyanova

Östlund

et al. 2021

Cellulose

View full text Add to dashboard Cite

The fiber properties after oxygen delignification and kraft pulping were studied by looking into the chemical characteristics and morphology. The effect of the two processes on the fibers was evaluated and compared over a wider kappa number range (from 62 down to15). Wide-angle X-ray scattering, nuclear magnetic resonance and fiber saturation point were used to characterize the fiber network structure. Fiber morphology and fiber dislocations were evaluated by an optical image analysis. The total and surface fiber charges were studied by conductometric and polyelectrolyte titrations. The fiber wall supramolecular structure, such as crystallinity, size of fibril aggregates, pore size and pore volume, were similar for the two processes. The selectivity, in terms of carbohydrate yield, was equal for kraft cooking and oxygen delignification, but the selectivity in terms of viscosity loss per amount of delignification is poorer for oxygen delignification. Clearly more fiber deformations (2–6% units in curl index) in the fibers after oxygen delignification were seen. Introduction of curl depended on the physical state of the fibers, i.e. liberated or in wood matrix. In the pulping stage, the fiber continue to be supported by neighboring fibers, as the delignified chips maintain their form. However, in the subsequent oxygen stage the fibers enter in the form of pulp (liberated fibers), which makes them more susceptible to changes in fiber form. Graphic abstract

show abstract

“…In general, the bonding area among fibers increases with fiber length and decreases with cell wall thickness. Since the interfiber bonding area is related to the burst and tensile strengths of paper, the fiber length and cell wall thickness play an important role in governing paper mechanical properties 33‐37 . Accordingly, long and thin fibers become a paper of high density, low stiffness, low ink adsorption and smooth surface which is suitable for printing paper.…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling and multiobjective control of wood fiber morphology in batch pulp digester

Choi

Kwon

2020

AIChE Journal

View full text Add to dashboard Cite

Even though it is widely known that mechanical properties of papers are dependent upon fiber morphology such as fiber length and cell wall thickness, existing macroscopic models are limited in describing the microscopic traits of pulp. Thus, we proposed a multiscale model by integrating a macroscopic model (i.e., Purdue model) and a microscopic model (i.e., kinetic Monte Carlo algorithm) to capture the dynamic evolution of the fiber morphology as well as conventional pulp quality index such as Kappa number. Then, a reduced‐order model is identified to handle the computational requirement of the multiscale model, and implemented to a model‐based controller to regulate both the fiber length and the Kappa number which are expressed in the forms of conflicting objective functions. The epsilon‐constraint method is employed to find the Pareto optimal sets to provide decision makers with the degree of freedom to choose one according to their preferred end‐use paper properties.

show abstract

Correlation Analysis for Fiber Characteristics and Strength Properties of Softwood Kraft Pulps from Different Stages of a Bleaching Fiber Line

Cited by 16 publications

References 10 publications

Effect of Press-Drying Parameters on Paper Properties

Effect of Press-Drying Parameters on Paper Properties

Differences and similarities between kraft and oxygen delignification of softwood fibers: effects on chemical and physical properties

Multiscale modeling and multiobjective control of wood fiber morphology in batch pulp digester

Contact Info

Product

Resources

About