Fixation Process of Laminated Bamboo Compression From Curved Cross-Section Slats

Abstract

Removing the outer part of bamboo for manufacturing flat bamboo lamination has disadvantage on the density of the product. The purpose of this experiment was to investigate the fixation of compressed bamboo from curved cross-section slats. The compression of bamboo slats using densification technique was aimed for uniform density. Furthermore, steam treatments were conducted to fix the deformation. The compressed bamboo slats revealed that the density of the samples at the bottom parts increased from 0.40–0.56 g/cm3 to 0.89–1.05 g/cm3 after pressing with a compression level between 46.98–63.97%, while the samples in the middle parts increased from 0.70–0.83 g/cm3 to 1.02–1.18 g/cm3 with the compression level of 32.92–41.50%. These results were slightly higher than that of the upper parts, which was between 0.91–0.98 g/cm3. The recovery of set decreased and the weight loss increased with increasing temperature and steam treatment time. Fixation of compressive deformation could be achieved at 160°C within 60 minutes. The bottom parts of samples experienced a slightly greater weight loss compared to the middle parts, i.e. 8.38% and 7.49%, respectively. The anatomical structure of bamboo tended to deform during densification process. Furthermore, the steam treatments affected the colour of densified bamboo which became darker. From this experiment, it can be concluded that the manufacture of laminated bamboo from bamboo slats can be uniformed in strength by equalizing the density at the bottom and middle with the upper parts through the densification technique. However, further research should be conducted to know the delamination and shear strength of the bamboo lamination.

Chemical, Physical, and Mechanical Properties of Belangke Bamboo (Gigantochloa pruriens) and Its Application as a Reinforcing Material in Particleboard Manufacturing

“…Compared to a previous report on betung bamboo [ 55 ], which found that the degree of crystallinity was 30.43%, the degree of crystallinity In the bottom was higher than the value. This degree of crystallinity is lower than that of acacia and pine wood by as much as 44.10% and 35.73%, respectively [ 56 ]. The variation in the degree of crystallinity based on the axial position in Gigantochloa pruriens bamboo had a similar tendency to the variation in chemical composition in the axial position of raru wood [ 57 ].…”

“…The higher density corresponded to a higher absorbance level. Typically, the bamboo’s top is higher than its other portions [ 56 ].…”

Physical and mechanical properties of belangke (Gigantochloa pruriens) bamboo laminated boards modified with citric acid

“…Bamboo is not only used for particleboard but also used for laminated board, as developed by previous research. Darmawan et al [15] reported that bamboo can be used as a laminated board and has good physical and mechanical properties. The development of bamboo as a raw material for laminated boards is good in terms of physical and mechanical properties, but bamboo has deficiencies in its durability, namely being easily attacked by destructive organisms [16,17].…”