Selected Properties of Densified Hornbeam and Paulownia Wood Plasticised in Ammonia Solution

Mania, Przemysław; Hartlieb, Karol; Mruk, Grzegorz; Roszyk, Edward

doi:10.3390/ma15144984

Cited by 8 publications

(2 citation statements)

References 27 publications

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“…In this case, the surface hardness will be important factor that is shown to significantly increase with the densification process [15]. Furthermore, radial densification of wood has been shown to enhance its hardness across three anatomical directions [16], while surface densification has demonstrated significant improvements in the Janka hardness of wood, particularly at higher pressing temperatures [17]. This process also holds promise for enhancing the hardness of the outer layers of veneer-based products, thereby opening new avenues for the utilization of low-density species [18], which in turn contributes to increased screw withdrawal capacity [19].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Hardwood Veneer Densification on Plywood Density, Surface Hardness, and Screw Withdrawal Capacity

Kallakas,

Akkurt,

Scharf

et al. 2024

Preprint

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The increasing environmental awareness and carbon-storing capability of wood have amplified its relevance as a building material. The demand for high-quality wood species necessitates exploring alternative, underutilized wood sources due to limited forest areas and premium wood volume. Consequently, the veneer-based industry is considering lower-value hardwood species like grey alder, black alder, and aspen as substitutes for high-quality birch. Initially less appealing due to their lower density and mechanical properties, these species show promise through densification, which enhances their density, strength, and hardness. This study aims to enhance plywood screw withdrawal capacity and surface hardness by densifying low-density wood species and using them in plywood face veneer layers or all layers. The relationship between wood density, surface hardness, and screw withdrawal capacity of plywoods made of low-value species like aspen and black alder is examined. Experimental work with a pilot-scale veneer and plywood production line demonstrates improved surface hardness (65% and 93% for aspen and black alder, respectively) and screw withdrawal capacity (16% and 35% for aspen and black alder, respectively) in face veneer densified low-value hardwood plywood. This research highlights the potential of densified low-value wood species to meet construction requirements, expanding their practical applications.

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Section: Introductionmentioning

confidence: 99%

The Effect of Hardwood Veneer Densification on Plywood Density, Surface Hardness, and Screw Withdrawal Capacity

Kallakas,

Akkurt,

Scharf

et al. 2024

Preprint

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show abstract

“…In contrast, cultivation in central and eastern Europe is at a very early stage, and there is no long-term confirmation of its effectiveness and profitability [ 20 , 23 ]. Nonetheless, Paulownia wood is gaining popularity, and several studies on its properties have been undertaken [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Radial Variability of Selected Physical and Mechanical Parameters of Juvenile Paulownia Wood from Extensive Cultivation in Central Europe—Case Study

et al. 2023

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The research on Paulownia cultivation and wood properties is up to date in many countries. However, there are no data on the properties of this wood defined on a microscale, on microtome samples. The main aim of this study was to find the best valorization path for the wood of Paulownia Shang Tong Hybrid F1 from an extensively cultivated plantation established in April 2017 in Poland by determining the tensile strength, the wood density, the strength-to-density ratio, and the modulus of elasticity on a cross-section of the trunk. The wood was collected from extensive plantation, where production is based on the natural resources of the habitat and ambient weather conditions, which is the opposite to the intensive cultivation model, which is the recommended model of Paulownia cultivation. The results of this study show that the mean density of the analyzed samples was approximately 210 kg/m3 when the mean value of the modulus of elasticity (MOE) was approximately 2400 MPa. The mean result for the tensile strength ratio to density was 11.25 km. In the case of anatomical structure, the increasing trend with age was noticed both in fiber and vessel characteristics. The study results provide unique data worldwide about Paulownia wood’s properties based on a cross-section of the trunk, from plantations cultivated in conditions which are not recommended by seedlings producers. The obtained data indicate that the Paulownia wood (examined) from the cultivation in this study has a technical quality similar to that of model-intensive agricultural plantations.

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Densification of fast-growing paulownia wood for tough composites with stab resistance

Chen,

Shen,

Sun

et al. 2024

Cellulose

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Selected Properties of Densified Hornbeam and Paulownia Wood Plasticised in Ammonia Solution

Cited by 8 publications

References 27 publications

The Effect of Hardwood Veneer Densification on Plywood Density, Surface Hardness, and Screw Withdrawal Capacity

The Effect of Hardwood Veneer Densification on Plywood Density, Surface Hardness, and Screw Withdrawal Capacity

Radial Variability of Selected Physical and Mechanical Parameters of Juvenile Paulownia Wood from Extensive Cultivation in Central Europe—Case Study

Densification of fast-growing paulownia wood for tough composites with stab resistance

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