Endoxylanase action towards the improvement of recycled fibre properties

Lorenzo, M. Lopez; Nierstrasz, Vincent; Warmoeskerken, Marinus

doi:10.1007/s10570-008-9246-0

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…The dispersed unbleached Eucalyptus Kraft Pulp was used to make handsheets employing a standard handsheet making apparatus (G 8E, Gockel & Co. GmbH, München). The basis weight of the handsheets was 60 g/m 2 , and the wet substrates were dried for 10 min at a temperature of 95 ℃ by laying a sheet on a heated plate of the dryer of the aforementioned standard handsheet making apparatus. This sheet was labeled as virgin paper (cycle 0).…”

Section: Preparation Of Recycled Handsheetsmentioning

confidence: 99%

“…Post-consumers' paper and paperboard are gathered as waste paper, which have become the main source of papermaking raw materials [2] and, thus, not only mitigate the problem of scarce wood resources but also reduce the issues that are associated with waste generation and final disposal. Unfortunately, using waste paper as recycled material for papermaking results in the loss of strength and the reduction of wet flexibility and bonding properties of the fibers, which are caused by hornification [3] .…”

Section: Introductionmentioning

confidence: 99%

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Water retention and physical properties of recycled fibers treated with NaOH/urea aqueous solution

Miao

Chen

Jia

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Irreversible hydrogen bonding is the most widely recognized mechanism of fiber hornification, and NaOH/urea aqueous solution can break the inter-and intramolecular hydrogen bonds of cellulose. In order to investigate whether or not this solution system reverses the hornification of fibers that repeatedly underwent wetting and drying, we studied the degree of hornification of repaired fibers, which have been treated with NaOH/urea aqueous solution and regenerated in H 2 SO 4 /Na 2 SO 4 aqueous solution, and we analyzed the physical properties of the resulting paper sheets. The water retention value (WRV) of the repaired fibers was equivalent to that of virgin pulp, and the hornification has been thoroughly reversed. The physical properties of the resulting paper sheets have improved, especially the tear and burst indexes, which have approximately doubled. Moreover, the dissolution/regeneration process slightly inhibited the degree of fiber hornification and increased the cycle number of the recycled fibers.

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Section: Preparation Of Recycled Handsheetsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water retention and physical properties of recycled fibers treated with NaOH/urea aqueous solution

Miao

Chen

Jia

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In addition, the unchanged fiber morphology of the fibers pretreated with CBDs, especially fiber length, plays a critical role in the development of the tensile index of the handsheet. López-Lorenzo et al (2003) reported that the relative bonding area, flexibility, and fibrillation of fibers can be modified by CBDs and by cellulases with CBDs to improve the properties of both fiber and paper. The handsheet tensile and tear indices of the pulps pretreated with CBDs that were obtained in the present study confirm that CBDs can modify the fiber surface by increasing the flexibility and swelling ability (WRV) of the fiber or by splitting the cellulose chain and releasing more active surfaces for bonding, but they also reveal that CBDs may lower the strength of a single fiber and result in some reduction in the tear index.…”

Section: Effects Of Pretreatments With Cellulase and Cbds On The Phys...mentioning

confidence: 99%

The role of cellulose binding domains in the adsorption of cellulases onto fibers and its effect on the enzymatic beating of bleached kraft pulp

Liu

Hui-ren

2012

BioRes

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The adsorption of cellulases onto fibers may be one of the most important factors affecting the enzymatic reaction between cellulases and fibers. This study investigated the adsorption kinetics involved, using isothermal adsorption equations. Cellulose binding domains (CBDs) were isolated from a commercial cellulase, and their role in the adsorption and enzymatic reaction was evaluated. Approximately 13% to 24% of the refining energy was saved after northern bleached softwood kraft pulp samples were pretreated with full cellulase, CBDs, or cellulase lacking CBDs under optimal conditions. The absence of CBDs in cellulase resulted in less effective enzyme adsorption and hydrolysis of the fibers. These data suggest that pretreatment of northern bleached softwood kraft pulp with CBDs may not only improve the beating degree of the pulp and reduce refining energy consumption but also improve the tensile index of the handsheet. Analysis of the degree of cellulose crystallinity and fiber surface morphology by X-ray diffraction and scanning electron microscopy revealed that the CBDs in cellulase help modify the crystalline area and facilitate the enzymatic degradation of cellulose. The adsorption parameters of the cellulases calculated from isothermal adsorption experiments confirmed the role of CBDs in the adsorption of cellulases onto fibers.

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High pressure-promoted xylanase treatment to enhance papermaking properties of recycled pulp

Salgueiro

Evtuguin

Saraiva

et al. 2016

Appl Microbiol Biotechnol

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Industrially produced bleached recycled pulp (R) comprising essentially hardwood fibres was subjected to enzymatic treatment with endo-xylanase from Thermomyces lanuginosus with or without ultra-high hydrostatic pressure (UHP) pre-treatment at 300-600 MPa for 10 min. The kinetics and the extent of enzymatic hydrolysis after UHP pre-treatment under different conditions have been evaluated by released reducing sugars and the analysis of neutral sugars in pulps, respectively. The changes in surface chemical composition of pulps were assessed by UV-vis diffuse reflectance spectroscopy. UHP-pre-treated R under optimal conditions (400 MPa), with or without posterior enzymatic treatment, was used for the production of handsheets and evaluation of its mechanical properties. It was suggested that enzymatic modification improves significantly the papermaking properties of recycled pulp. These improvements were related with selective removal of xylan bound to impurities and to aggregated cellulose fibrils on the fibre surface, thus favouring the ensuing swelling and inter-fibre bonding in paper. UHP pre-treatment and posterior enzymatic treatment revealed a synergetic effect on the mechanical properties of recycled pulp. This fact was assigned to enhanced accessibility of fibres towards xylanase and by forced hydration and favourable rearrangement of cellulosic fibrils in fibres after UHP pre-treatment. The increase of basic strength properties after UHP-promoted xylanase treatment was up to 30 % being the most pronounced for the tensile strength and the burst resistance.

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Endoxylanase action towards the improvement of recycled fibre properties

Cited by 5 publications

References 14 publications

Water retention and physical properties of recycled fibers treated with NaOH/urea aqueous solution

Water retention and physical properties of recycled fibers treated with NaOH/urea aqueous solution

The role of cellulose binding domains in the adsorption of cellulases onto fibers and its effect on the enzymatic beating of bleached kraft pulp

High pressure-promoted xylanase treatment to enhance papermaking properties of recycled pulp

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