Pengaruh Pengeringan Terhadap Perubahan Warna, Penyusutan Tebal, Dan Pengurangan Berat Empat Jenis Bambu

Abstract

The surface color of bamboo stem changes naturally due to surrounding conditions. This paper studies the changes in bamboo surfaces color due to room temperature drying (KU) and oven drying (KO) at 60±2 °C. The color changes of four bamboo species: mayan (Gigantochloa robusta Kurz.), ater (Gigantochloa atter (Hassk) Kurz. Ex. Munro), ampel kuning (Bambusa vulgaris var. striata), and wulung (Gigantochloa atroviolacea Widjaja) were studied together with their correlation to water loss. Color measurements were conducted based on CIE-Lab system, while water content related to weight loss and thickness shrinkage during KU and KO. The result showed that there was a close relationship between water loss and discolouration of bamboo culms. The water loss of mayan, ater, and wulung showed a positive linear correlation to change of bamboo surfaces color, where the higher water loss affect greater value of color change too. Oppositely, in ampel kuning, higher water loss, affect smaller color change value (negatively correlated). This was because the natural color of ampel kuning in fresh conditions is not much different from color after drying. KU treatments, biggest thickness shrinkage was mayan = 46.03%; biggest weight reduction was ampel kuning = 28.52%; and biggest color changes (ΔE*) was ater = 15.51%. KO treatments, biggest thickness shrinkage was mayan = 52.4%; biggest weight reduction was yellow ampel = 31.19%; and biggest color changes (ΔE*) was ater = 18.8%.

Effects of Torrefaction Temperature on the Characteristics of Betung (Dendrocalamus asper) Bamboo Pellets

“…(Widyorini et al, 2014). The water content lost during the heating process can also cause changes in the color of the biomass (Bahanawan & Krisdianto, 2020). Visually it can be seen clearly (Figure 2) that the torrefied bamboo pellets have a darker color as the torrefaction temperature increases.…”

The artistic properties of rosewood (Dalbergia latifolia Roxb.) as a reference for the development of decorative veneers and synthetic vinyl.

“…Tabel 2 menunjukkan rerata nilai E untuk bagian kayu gubal dan kayu teras sonokeling yang merupakan hasil rerata dari Tabel 1 di atas dimana gubal adalah rerata pada titik pengukuran 1,3,4,dan 6 sedangkan teras pada titik pengukuran 2 dan 5. & Krisdianto, 2020).…”