Effects of Hot-Pressing Parameters on Shear Strength of Plywood Bonded with Modified Soy Protein Adhesives

Li, Hongyan; Li, Congcong; Chen, Hui; Zhang, Derong; Zhang, Shifeng; Li, Jianzhang

doi:10.15376/biores.9.4.5858-5870

Cited by 13 publications

(13 citation statements)

References 16 publications

(15 reference statements)

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“…On the other hand, the greater HP contributes to enhancing the penetration of HDPE into the wood tissue, thus forming composites with the more compact micro-structure; however, the too high HP can destroy the morphology of plant cells and diminish the density of wood-plastic interfaces due to pressing excess HDPE into veneers. Moreover, the larger HC contributes to providing adequate adhesive, thus creating stronger interfacial bonding; however, too high HC can decrease the composite strength due to the flexibility of HDPE and lead to the overflow of some HDPE as resource wastes (Li et al 2014). Considering the complexity, the quantitative relationship between process factors and composite properties must be determined by the artificial intelligence in following sections.…”

Section: The Interaction Between Process Factors and Composite Propermentioning

confidence: 99%

Developing and Evaluating Composites Based on Plantation Eucalyptus Rotary-cut Veneer and High-density Polyethylene Film as Novel Building Materials

Song¹,

Wei²,

Ren³

et al. 2016

BioResources

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To achieve value-added utilizations of plantation timbers, eucalyptus veneer/high-density polyethylene film composites were prepared, with process-factors (PF) (hot-pressing temperature, HT; hot-pressing duration, HD; hot-pressing pressure, HP; HDPE-film content, HC) and composite-properties (CP) (water-resistant bonding-strength, BS; modulus of rupture, MOR; modulus of elasticity, MOE) investigated. According to thermal analyses, 140 to 180 °C was appropriate for HT. Based on statistical analyses, HD was easier to affect CP, while MOE was easier to be affected by PF. Quantitative relationships between PF and CP were determined by the neural-network (ANN) modeling. In ANN simulation surveys, CP displayed Gaussian distributions (R 2 > 0.9) when PF changed in current ranges, with positive correlations between BS and MOR (R 2 ≈ 0.5). Combining ANN and the genetic-algorithm, optimal processes (HT, 160 °C; HD, 50 s/mm; HP, 1.3 MPa; HC, 6 layers) were found, and optimal results (BS, 1.30 MPa; MOR, 86.94 MPa; MOE, 8.33 GPa) were comparable to various reported poplar-plywoods. Microscopic images demonstrated that composite interfaces were formed by the mechanical interlocking. The optimal BS attained Chinese standards for water-resistant plywoods, so proposed composites can serve as waterresistant and formaldehyde-free building materials for furniture and interior design.

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Section: The Interaction Between Process Factors and Composite Propermentioning

confidence: 99%

Developing and Evaluating Composites Based on Plantation Eucalyptus Rotary-cut Veneer and High-density Polyethylene Film as Novel Building Materials

Song¹,

Wei²,

Ren³

et al. 2016

BioResources

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“…The possibility of reducing hot pressing time has been studied in previous works on some types of wood composite materials, such as laminated veneer lumber (LVL) [15,16], particleboard [17], oriented strand board (OSB) [18] and medium-density fiberboard [19]. However, there are only a few studies in the existing literature regarding the effect of pressing time on the properties of plywood [16,[20][21][22][23]. Shortening the duration of plywood pressing can be realized by steam injection [20] or by veneer incising [16,21].…”

Section: Introductionmentioning

confidence: 99%

Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing

2020

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This research optimizes the process of plywood production to determine its effectiveness in reducing energy and adhesive consumption for more efficient production with the required quality. The influence of selected parameters including veneer treatment (non-densified and densified), plywood structure, temperature, time and pressure of pressing, on the bonding quality and temperature evolution within the veneer stacks during hot pressing was investigated. Rotary-cut, non-densified and densified birch veneers and phenol formaldehyde (PF) adhesive were used to manufacture plywood samples. The effect of pressure and time of pressing on bonding quality of the plywood was determined. Bonding quality was evaluated by determining the shear strength of the plywood samples. The temperature evolution inside the veneer stacks was measured for birch veneers for different pressing temperatures and pressures for different numbers of veneer layers. The heating rate of the veneer stacks increased as the pressing temperature increased and decreased markedly with an increasing number of veneer layers. At a high pressing pressure, the heating rate of the densified veneer stacks was faster than that of non-densified veneers at the same pressure. The use of densified veneers for the production of plywood can lead to a shorter pressing time (17–50% reduction), lower glue consumption (33.3% reduction) and a lower pressing pressure (22.2% reduction) without negatively impacting the bonding strength of the plywood.

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“…The alternative use of biomass-based, biodegradable adhesives can solve the negative environmental impact by the wood processing industry, as they can be degraded within the environment by moisture and microorganisms (Hongyan et al 2014). One of the possible available materials for the production of adhesive mixture fillers is the bark of domestic wood materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of Urea-formaldehyde Adhesive Modification with Beech Bark on Chosen Properties of Plywood

Ružiak¹,

Igaz²,

Krišťák³

et al. 2017

BioResources

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The influence of beech bark concentrations as filler in urea-formaldehyde (UF) adhesives was investigated relative to the composite forming process and selected properties of final 5-layer beech plywood. Beech bark was used as filler to lower the wood processing waste production and decrease formaldehyde emissions. A combination of UF adhesives filled with different beech bark concentrations as the adhesive was used. Three different concentrations of beech bark, 15 wt.%, 20 wt.%, and 25 wt.% were used in the experiment. Urea-formaldehyde adhesive filled with 20 wt.% technical flour was used as a reference sample. The effect of the filler was studied via its temperature profile during pressing, mechanical properties in bending, water absorption, thickness swelling, and formaldehyde emissions after pressing. The time needed to reach the temperature between the beech veneers, at least 105 °C, which was equal to the final temperature filler-adhesive-wood matrix cross-linking, was also investigated during the pressing process. The measurements of the free formaldehyde emissions showed that for samples with non-zero bark concentrations there was a decrease of formaldehyde emissions by at least 46%.

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Effects of Hot-Pressing Parameters on Shear Strength of Plywood Bonded with Modified Soy Protein Adhesives

Cited by 13 publications

References 16 publications

Developing and Evaluating Composites Based on Plantation Eucalyptus Rotary-cut Veneer and High-density Polyethylene Film as Novel Building Materials

Developing and Evaluating Composites Based on Plantation Eucalyptus Rotary-cut Veneer and High-density Polyethylene Film as Novel Building Materials

Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing

Influence of Urea-formaldehyde Adhesive Modification with Beech Bark on Chosen Properties of Plywood

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