Abstract
In this study, a bamboo stick board with rotary-cut bamboo veneers was successfully fabricated. Additionally, vacuum heat (VH) treatment, which is a popular thermal modification method, was used to modify bamboo sticks. Therefore, the effects of different VH treatment temperatures on the dimensional stability and flexural properties of bamboo stick boards with and without bamboo veneers were investigated. For all boards, as the temperature increased to 220 °C, the thickness change rate and equilibrium moisture content decreased, and the flexural properties increased. The results exhibited that VH treatment improved the dimensional stability and flexural properties of the boards. Furthermore, the board with veneers had lower flexural properties and higher thickness swelling after water absorption than the board without veneers (BSB). The results indicated that bamboo veneer caused low flexural properties and high thickness swelling of the board compared to the BSB. However, the bamboo veneer played an aesthetic role in the appearance of the bamboo stick board.
Highlights
Bamboo is widely distributed and abundant across Asia
The results indicated that most of the physical (TCR and equilibrium moisture content (EMC)) and dimensional (WA and thickness swelling (TS)) properties significantly decreased as the treatment temperature increased to 220 ◦ C, while flexural properties (MOR and modulus of of elasticity elasticity (MOE)) showed an increasing trend as the treatment temperature increased
A comparison of the board with and without bamboo veneers showed that the VBSB had lower flexural properties and higher TS after 24 h of soaking compared to the bamboo stick board (BSB)
Summary
Bamboo is widely distributed and abundant across Asia. bamboo has highly mechanical properties due to the longitudinal alignment of vascular bundles in its tissue structure and has a chemical composition of 60% cellulose with a high content of lignin [1,2,3]. Academia and industry have developed bamboo-based materials, such as bamboo fiber-reinforced polymer composites [4,5,6], laminated bamboo lumber [7,8,9,10], reconstituted densified bamboo products [9,10,11,12,13], and unidirectional round bamboo stick boards [14] Among these materials, reconstituted densified bamboo products have attracted investigation, since they are fabricated with high utilization of bamboo and possess highly mechanical properties [11]. To further utilize the bamboo veneer, the bamboo stick board was combined with bamboo veneers in this study
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