A review of preparation of binderless fiberboards and its self-bonding mechanism

Zhang, Daihui; Zhang, Anjiang; Xue, Lixin

doi:10.1007/s00226-015-0728-6

Cited by 111 publications

(81 citation statements)

References 85 publications

(123 reference statements)

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“…However, the major problem of adhesives in fiberboards is formaldehyde emission, which causes health and environmental concerns (Zhang et al 2015). The strict environmental protection, human health safety regulations, and mounting raw material costs have facilitated some research into reducing or replacing the amount of harmful and/or expensive adhesive components with more environmentally friendly and safer alternatives (Widsten and Kandelbauer 2008).…”

Section: Introductionmentioning

confidence: 99%

Understanding the Mechanism of Self-Bonding of Bamboo Binderless Boards: Investigating the Structural Changes of Lignin Macromolecule during the Molding Pressing Process

Wang

Chen

et al. 2016

BioResources

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Binderless boards were produced from bamboo particles through a molding pressing process. The boards were investigated for the chemical and structural changes of lignin and their mechanical strengths to evaluate the mechanism of self-bonding. The structural transformations of milled wood lignin (MWL) obtained from raw bamboo and molding pressed bamboo boards were investigated by Fourier transform infrared (FT-IR), gel permeation chromatography (GPC), quantitative 13 C-NMR spectra, two-dimensional heteronuclear single quantum coherence (2D-HSQC) spectra, 31 P-NMR, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) techniques. Both molding press temperature and time affected the distribution and abundance of typical lignin linkages (β-O-4′, β-β′, and β-5′), as well as the S/G ratios of the lignin, demethoxylation, and the contents of attached molecules (PCE). In addition, a decrease in aliphatic OH and an increase in phenolic hydroxyl groups occurred in lignin as molding pressing proceeded. The optimal internal bonding strength (0.98 MPa) of the bamboo binderless board was obtained under the condition of 180 ºC for 20 min. Although the lignin obtained under this condition was structurally similar to the raw MWL, the decreased molecular weight, increased phenolic hydroxyl groups, and observable glass-transition temperature (thermal softening of lignin) provide some evidence to explain the acceptable internal bonding strength.

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Section: Introductionmentioning

confidence: 99%

Understanding the Mechanism of Self-Bonding of Bamboo Binderless Boards: Investigating the Structural Changes of Lignin Macromolecule during the Molding Pressing Process

Wang

Chen

et al. 2016

BioResources

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“…The high temperatures during hot-air and hot-steam treatment lead to better bonding as the obvious result of an effective lignin-lignin crosslinking, even by using UF resin. Evaluating the IB and TS of laccase-and inactivated LMS-bonded MDF, the positive effect of hot-air/hot-steam pre-heating before hot-pressing can also be seen, apparently supported by the self-bonding mechanism of lignin (Bouajila et al 2005;Zhang et al 2015). Nevertheless, the values are not acceptable for the EN standard.…”

Section: Physical-technological Propertiesmentioning

confidence: 99%

Pre-pressing and Pre-heating via Hot-Air/Hot-Steam Process for the Production of Binderless Medium-Density Fiberboards

Euring¹,

Kirsch²,

Kharazipour³

2016

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The hot-air/hot-steam process was used for the first time as a combined pre-pressing and pre-heating system for the production of medium-density fiberboards (MDF) at the pilot scale. Pre-heating systems are designed to pre-heat fiber mats before pressing by hot-presses. Using such techniques, pressing times are reduced significantly and the board properties are influenced positively; both are essential for effective MDF production. In recent years, industry has searched for alternatives to petrochemical binders. Primarily, MDF are bonded by urea-formaldehyde (UF) resins in Europe. To replace UF resins, a laccase-mediator-system (LMS) was used to activate the wood fibers' self-cohesion. It was found that the internal bond strength (IB) and thickness swelling (TS) were noticeably improved by applying the hot-air/hot-steam process before final hot-pressing for both LMS and 10% UF binding systems. Simultaneously, the total pressing time could be reduced by 25% when combining the hotair/hot-steam process with hot-pressing.

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“…Fiberboards can be produced without the addition of adhesives from different lignocellulosic materials (Boehm 1930;Mancera et al 2008;Zhang et al 2015;Pintiaux et al 2015;Presenti et al 2017). The characteristics of these boards vary depending on the raw material used, the production process, and the parameters used in the final assembly.…”

Section: Introductionmentioning

confidence: 99%

High Mechanical Performance Boards Made from Fibers of Arundo donax without Added Adhesives

2017

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Arundo donax is a cane species with high growing productivity, and it is becoming an important source of biomass. The main objective of this study was to obtain fibreboards with high mechanical performance from A. donax without any added adhesive. Boards made without adhesive are free from formaldehyde emissions and consume no fossil resources. The characteristics of the obtained boards depended on the original material, steam explosion pre-treatments, and forming conditions (pressure, temperature, and pressing time). Production parameters were optimized. The effect of forming pressure on the physical and mechanical properties density, elastic modulus (MOE), modulus of rupture (MOR), tensile strength perpendicular to the faces (IB), thickness swelling, and water absorption of the obtained boards was studied. The European Norms (EN) methodologies were used to test the board specifications. Density, MOE, and MOR were modelled by a double reciprocal function. TS and WA were modelled with a reciprocal function in X. The boards obtained met and sometimes exceeded the requirements of these standards for the most demanding structural use.

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A review of preparation of binderless fiberboards and its self-bonding mechanism

Abstract: The demand for fiberboards has been growing

Cited by 111 publications

References 85 publications

Understanding the Mechanism of Self-Bonding of Bamboo Binderless Boards: Investigating the Structural Changes of Lignin Macromolecule during the Molding Pressing Process

Understanding the Mechanism of Self-Bonding of Bamboo Binderless Boards: Investigating the Structural Changes of Lignin Macromolecule during the Molding Pressing Process

Pre-pressing and Pre-heating via Hot-Air/Hot-Steam Process for the Production of Binderless Medium-Density Fiberboards

High Mechanical Performance Boards Made from Fibers of Arundo donax without Added Adhesives

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