Tying together the ultrastructural modifications of wood fibre induced by pulping processes with the mechanical properties of paper

Chevalier-Billosta, Valérie; Joseleau, J.P.; Cochaux, A.; Ruel, K.

doi:10.1007/s10570-006-9081-0

Cited by 21 publications

(15 citation statements)

References 12 publications

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“…The effects were considerably different whether the fines had been dried during the pulp treatments (the so-called dead fines) or never-dried (the so-called fresh fines) generated during mechanical refining (Chevalier-Billosta et al 2011). …”

Section: Resultsmentioning

confidence: 99%

Interaction between microfibrillar cellulose fines and fibers: influence on pulp qualities and paper sheet properties

2012

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Due to the high potential of cellulose nanoparticles in composite materials and for both fundamental and technological considerations, we investigated the interaction between microfibrillar cellulose and fibers. The contribution to the paper properties of fines added to a pulp suspension was determined. The impact of various proportions of fines added to a softwood kraft pulp on the paper strength and how they affected porosity and density was evaluated. The respective effects of dried fines (dead fines), originating from paper or board degradation, and the newly formed secondary fines (fresh fines) generated during refining were examined. The nature of the bonding between the fines and the fibers versus physical retention was characterized in the pulp suspension. For the first time the respective parts in the interaction of hydrogen bonds and mechanical associations were demonstrated and quantified. The amount of H-bonded fresh fines exceeded that of dead fines by more than 30 %. The results revealed that, for both types, the amount of H-bonded fines reached a threshold, independently of the proportion of fines added to the fibers. Addition of fines significantly affected the porosity of papers, fresh fines decreasing porosity more readily than dead fines. All the results are convergent to indicate that fresh fines penetrate more evenly and more deeply into the fiber network and induce better bonding that produces a closure of the fiber mat structure. They also demonstrate that incorporating an optimal proportion of fresh cellulose fines in fiber networks can bring significant improvement to the final composite material.

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Section: Resultsmentioning

confidence: 99%

Interaction between microfibrillar cellulose fines and fibers: influence on pulp qualities and paper sheet properties

2012

Self Cite

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“…During its drying, pressing, storage, use, and disposal, paper undergoes a series of chemical and physical changes that, with the decrease in fiber length, help to explain the loss of mechanical properties commonly reported for recycled paper. These changes include the loss of cellulose fines in water (which eventually pass through the nylon screen), the emergence of cracks in the fibers, the closure of pores, decreased surface area and the formation of hydrogen bonds between the surfaces of pressed fibers [12][13][14]. The loss of fines may have been more intense during manual recycling because a coarser nylon screen was used (10 strands/cm 2 ) than the one used in industrial recycling (20 strands/cm 2 ), which helps to explain the inferior mechanical properties of the materials obtained by manual recycling.…”

Section: Methodsmentioning

confidence: 99%

“…No noticeable change in the size of the particles, and particularly of the fibers (or in the latter's thickness) is visible; which would have indicated that their dimensions were changed in the recycling process [12]. Even under higher magnification, it was also not possible to detect fiber delamination or cracking, or closing of pores, which could, like decreased average fiber length, negatively impact the properties [12][13][14]. Figure 3 shows the EDS results from the region presented in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…There is still the possibility of refining, a step usually applied to the production of paper from wood and even to its recycling. It is well-known that refining improves mechanical properties, by promoting attraction among the cellulosic fibers [12,13]. If the insulation properties do not reach those of the original material, then the possibility of using the recycled material in places where the temperature peaks are lower should be verified.…”

Section: Methodsmentioning

confidence: 99%

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Recycling scrap automotive heat shield insulation material

Moretti

Mancini

Antunes

et al. 2013

J Mater Cycles Waste Manag

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Automotive heat shields are usually composed of two metal sheets enclosing an insulating material with a paper-like texture that contains refractory ceramic particles. This article discusses the results achieved by recycling the scrap automotive insulation that is discarded in landfills, using the same concept as paper recycling. For comparison with the original product, tests of thickness, bulk density, weight loss on ignition, tensile strength, compressibility, and recovery were performed on recycled materials produced in a so-called ''manual'' process (involving little automation and performed in adapted facilities) without pressing, and pressed once, twice, and four times. Materials recycled in a so-called ''industrial'' process (in a paper recycling plant) without pressing, and pressed once were also tested. The recycled materials can be considered approved with respect to the main requirement, thermal insulation, since they dissipated the underhood temperature by more than 300°C (like the original product). Like the heat insulation tests, the thermogravimetric analysis suggested that the recycled materials showed higher stability than the original product. Thermogravimetric, microscopy, and energy dispersive spectroscopy analyses indicated that the structural and compositional characteristics of the original product were preserved after recycling.

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“…The usefulness of fines co-generated by the mimicked APMP system (hereby denoted APP for alkaline peroxide pulping) was also noticed to contradict the reported undesirable effects of wood fines and short fiber [22]. Usefulness of wood and non-wood market pulp fines has been in wide coverage [23][24][25][26][27][28] till the present time. Lukko and Paulapuro, for instance, found that desirable fines were co-generated with intensified refining [29].…”

Section: Introductionmentioning

confidence: 99%

Sequential Synergy of Alkaline Peroxide Treatment and Refining in Co-generating Filler for Pulp Web Augmentation

Ghazali¹

2012

IJEE

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Desired pulp-based product properties can be achieved by addition of filler in the pulp network. In exploring this, fines co-generated upon refining the alkaline peroxide treated oil palm empty fruit bunches (EFB) were collected based on their passage and retention capacities when subjected to varying mesh-sizes stainless-steel square mesh wires. Pulp network incorporating fines produced from the synergy of low alkaline peroxide (AP) and low energy refining effects shows that blending 12% of the 400-mesh fines (P300/R400) with the normal 200-mesh pulp fraction enhanced paper tensile strength by 100% due to their favourable dimensions. This defines the usefulness of fibrillar particles whose cell wall collapsibility increases the web density by increasing bonding ability and thus, strength of pulp-based products. Fines produced from more extreme synergy between alkaline peroxide and degree of refining, exhibit unique submicron fibrils and 'nano-CGF' also responsible for further augmentation of EFB alkaline peroxide pulp network. Whether from the simple (low-AP and low energy refining) or the extreme synergy of AP and refining, the co-generated fines are apparently suitable materials for use as natural filler for augmentation of pulp network. Particularly for the simple AP and refining synergy, the introduced recovery and utilization of the cogenerated filler (CGF) was found to reduce 74% turbidity and this improvement will help reduce the complexity of whitewater generation in the pulping system.

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Tying together the ultrastructural modifications of wood fibre induced by pulping processes with the mechanical properties of paper

Cited by 21 publications

References 12 publications

Interaction between microfibrillar cellulose fines and fibers: influence on pulp qualities and paper sheet properties

Interaction between microfibrillar cellulose fines and fibers: influence on pulp qualities and paper sheet properties

Recycling scrap automotive heat shield insulation material

Sequential Synergy of Alkaline Peroxide Treatment and Refining in Co-generating Filler for Pulp Web Augmentation

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