Reinforcement effect of pulp fines and microfibrillated cellulose in highly densified binderless paperboards

Winter, Armin; Gindl‐Altmutter, Wolfgang; Mandlez, Daniel; Bauer, Wolfgang; Eckhart, René; Leitner, Johannes; Veigel, Stefan

doi:10.1016/j.jclepro.2020.125258

Cited by 26 publications

(13 citation statements)

References 29 publications

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“…The changes in the °SR values given for the whole pulp and fines-free pulp depending on the beating time were examined (Figure 1), which data showed a linear relationship. As stated in previous studies °SR values are affected by fines (Ferreira et al, 2000;Hubbe and Heitmann, 2007;Guo et al, 2009;Winter et al, 2021), significant decreases were observed in the °SR value of fines-free pulp samples obtained by screening the fines. The presence of fines in the pulp suspension is an indication that the whole pulp can hold more water in this state.…”

Section: Resultssupporting

confidence: 65%

An investigation of the tensile characteristics of printed handsheets

Engin

Sönmez

Kurt

2021

PRT

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Purpose The purpose of this paper is to investigate the influences of fibre lengths and a given range of paper grammages on the fundamental properties of unprinted and printed papers by using mineral oil-based offset printing inks and also evaluate these results in terms of printing and tensile characteristics. Design/methodology/approach A design research approach has been based on the production of various laboratory handmade papers and their printing process with mineral oil-based offset printing inks. The analysis of mechanical and structural tests results of the unprinted and the printed papers have been evaluated. Findings This study is confirmed that the mineral oil-based offset printing inks can be easily applied to the surface of papers having different grammages and pulp contents. An increase was observed in the tensile index values of the papers with the printing process, and these increases were more evident (about 80%) particularly in low grammage papers having high short fibre content. Originality/value The originality of this work is based on understanding and comparing the effects of grammage and the effect of pulp contents (having long and short fibre) on tensile characteristics of printed and unprinted handsheets.

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Section: Resultssupporting

confidence: 65%

An investigation of the tensile characteristics of printed handsheets

Engin

Sönmez

Kurt

2021

PRT

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“…In addition to fibre straightening, beating causes fibrillation along the fibre surfaces. Fibrillation, or the exposure of cellulose fibrils, will certainly improve the accessible surface area, enhance fibre-fibre bonding, and ultimately, improve laboratory paper handsheet mechanics [ 75 , 76 , 77 ]. Aside from the tear index, fibre fibrillation significantly increased all of the strength properties (refer to Table 2 ).…”

Section: Resultsmentioning

confidence: 99%

Valorisation of Underutilized Grass Fibre (Stem) as a Potential Material for Paper Production

et al. 2022

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An integrated and feasible approach was proposed using the underutilized grass fibre (stem) derived from Napier grass and sugarcane for paper production in this study. To enhance paper strength, pre-hydrolysis and beating techniques have been used to improve the chemical pulps and mechanical pulping process, respectively. Napier grass and sugarcane are promising non-wood sources for pulp production, owing to their high cellulose and low lignin and extractive content. With the additional mild alkaline pre-treatment to the mechanical pulping process, the lignin content was greatly reduced. The results reveal that the mechanical pulping with alkaline pre-treatment may indeed potentially replace the most prevalent pulping process (chemical pulping). As evidenced by the paper strength properties, mechanical pulping is far more suitable for grass-type biomass, particularly Napier grass, which had a folding endurance capability five times greater than chemical pulping. Furthermore, the remaining high hemicellulose content from mechanical pulping contributed to a high pulp yield, while also facilitating the fibrillation on the sugarcane’s laboratory paper handsheet. The findings also demonstrated that the additional beating process from chemical pulping causes the fibres to be drawn toward each other, resulting in a more robust fibre network that contributes to good paper strength. Consequently, this work sheds new light on the development of advanced paper derived from grass fibre.

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“…Silva et al [4] reported a mean L/D value of 24 for cellulose nanocrystals, which is superior to that achieved in this study (9.14). The L/D value is an important parameter for mechanical reinforcement, i.e., the higher the L/D value, the higher is the reinforcement capacity [51,52].…”

Section: Mechanical Analysismentioning

confidence: 99%

Cellulose Nanoparticles Prepared by Ionic Liquid-Assisted Method Improve the Properties of Bionanocomposite Films

et al. 2022

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Bionanocomposites have garnered wide interest from the packaging industry as a biocompatible alternative to non-biodegradable petroleum-based synthetic materials. This study presents a simple and eco-friendly alternative to produce cellulose nanoparticles using a protic ionic liquid, and the effects of their incorporation in cassava starch and chitosan lms are evaluated. Bionanocomposite lms are prepared using the solvent casting method and are characterized using X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential, thermogravimetry analysis, and transmission electron microscopy. The achieved yield of cellulose nanoparticles is 27.82%, and the crystalline index is 67.66%. The nanoparticles' incorporation (concentration from 0.2 to 0.3%) results in a progressive reduction of water vapor permeability up to 49.50% and 26.97% for starch and chitosan bionanocomposite lms, respectively. The starch lms with 0.1% cellulose nanoparticles exhibit signi cantly increased exibility compared to those without any addition. The nanoparticles' incorporation in chitosan lms increases the thermal stability without affecting the mechanical properties. The study demonstrates that the use of cellulose nanoparticles obtained using protic ionic liquid can be a simple, sustainable, and viable method to produce bionanocomposites with tailored properties useful for applications in the packaging industry. ConclusionsCellulose nanoparticles (CNP-DM) were successfully prepared using a protic IL ([DMAPA][Hex]) while maintaining crystal integrity. The IL exhibited high selectivity to the amorphous region during the dissolution process. Incorporating CNP-DM improved the thermal stability, exibility, and WVP of the starch and chitosan bionanocomposite lms. For both polymeric matrices, the incorporation of 0.2% CNP-DM was su cient to signi cantly reduce the WVP, allowing the application of these bionanocomposites in food packaging.The results obtained in this study are associated with low-cost production, biocompatibility, low toxicity, and recyclability, making [DMAPA][Hex] a simple, e cient, and sustainable solvent to produce cellulose nanoparticles.Further research will be conducted to improve the bionanocomposites' mechanical properties, which are essential for food packaging.

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Reinforcement effect of pulp fines and microfibrillated cellulose in highly densified binderless paperboards

Cited by 26 publications

References 29 publications

An investigation of the tensile characteristics of printed handsheets

An investigation of the tensile characteristics of printed handsheets

Valorisation of Underutilized Grass Fibre (Stem) as a Potential Material for Paper Production

Cellulose Nanoparticles Prepared by Ionic Liquid-Assisted Method Improve the Properties of Bionanocomposite Films

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