Tali Bamboo Research Articles

Pengaruh Pola Susunan Laminasi Balok Bambu Tali (Gigantochloa apus Kurz) terhadap Kerapatan, Delaminasi dan Keteguhan Patah

Effect of Lamination Pattern of Tali Bamboo (Gigantochloa apus Kurz) Beam on Density, Delamination, And Rupture StrengthBamboo is a potential species as its price is relatively less expensive than wood logs while it also represents a fast growing plant and is easy to plant. In general bamboos in South Kalimantan have not been exploited optimally. Its utilization for construction purposes is very limited. This study aims to identify the effects of lamination pattern on the density, delamination and rupture impregnability (Modulus of Rupture, MoR) of laminated bamboo blocks, with the combinations of a (reed wall- reed wall), b (reed wall-husk), and c (husk- husk and reed wall-reed wall). The results showed that lamination patterns affected the density, delamination and rupture impregnability of the laminae produced. The average density (kg/cm3) is 0.5321, 0.6923, and 0.6746 for treatments a, b, and c respectively. Delamination percentage (%) is 6.55, 16.65, and 21.1, while the rupture impregnability level (kg/cm2) is 228.99, 152.09,and 171.97 for treatments a, b, and c respectively. Delamination percentage of less than 10% suggets that the laminae produced can be used for building construction. that It is concluded that lamination pattern of reed wall-reed wall gave the best performance of bamboo lamina with the average density of 0.5321 kg/cm3, the delamination percentage of 6.55% , and the rupture impregnability level of 228.99 kg/cm2.

Tannin Resorcinol Formaldehyde as Potential Glue for the Manufacture of Plybamboo

1 2 3 The tannin extracted from mangium ( Wild) tree bark exhibits strong affinity toward formaldehyde when both being reacted forming the tannin formaldehyde polymer which further could serve as resin adhesive. To improve the bonding strength and enhance the curing process, the tannin and formaldehyde is co-polymerized with resorcinol to form tannin resorcinol formaldehyde (TRF) resin. This resin is expectedly useful in the gluing work for the manufacture of reconstituted wood or other ligno-cellulosic products such as plywood, glue laminated timber, and laminated veneer lumber. In relevant, the tannin extract (T) was prepared from mangium bark, then allowed to copolymerize through the reaction with resorcinol (R) and formaldehyde (F) to produce the TRF resin. In such copolymerization, the mole ratios of T : R : F was such that the mole portion of R varied at consecutively: 0.2, 0.5, 0.7, 0.9 and 1.1, while the mole portion of T and F was constant at the ratio of 1 : 1. The course and phenomena that might occur during the TRF polymerization was scrutinized using XRay diffraction (XRD) and Differential Thermal Analysis (DTA) to determine the optimum ratio of T : R : F in formulating the TRF adhesive. The resulting formulated TRF was later to be used in the gluing of ply-bamboo assembly consisting of 7 plies, which were virtually the veneers prepared from tali bamboo ( ) species. The already shaped seven-ply-bamboo further sustained the hotpressing at 20 kg/cm employing 130 C for 20 minutes. Afterwards, the resulting 7-ply-bamboo panel was examined of its physical and mechanical (strength) properties, glue-bond quality and formaldehyde emission. Result revealed that the TRF resin with mole ratio of T : R : F at 1 : 0.5 : 1 exhibited the highest crystallinity (51.33 %) and melting glass transition at 277.14 C. In addition, the TRF adhesive at such mole ratio exhibited the thermogram and diffractogram characterization which were similar to those of the conventional PRF (phenol-resorcinol-formaldehyde) adhesive. Consequently, the TRF with such ratio was judged as the optimum formulation to be used as adhesive for the gluing of ply-bamboo assembly. The resulting ply-bamboo exhibited particular characteristics, i.e density 0.904 g/cm MOR 1,214.62 kg/cm , MOE 19,493 kg/cm , bonding strength 38,40 kg/cm and zero percent (0%) delamination, and formaldehyde emission 0.043 mg/L. The properties of ply bamboo could mostly satisfy, except the MOE, the criteria of Indonesian and Japanese standard for structural that used the conventional non-renewable adhesive (PF and UF). As a result, the TRF adhesive as derived from the renewable stuff (tannin from mangium bark), with remarkably low formaldehyde emission seems more consecutively prospective environmentally friendly, significantly potential to replace sooner or later the non-renewable and less environmentally friendly conventional adhesive (UF and PF), thereby indicatively taking part in greening the environment and mitigating the global warming.

SIFAT MEKANIS LAMINASI LENGKUNGAN BAMBU BETUNG (Dendrocalamus asper (Schulters f.) Backer ex Heyne) dan TALI (Gigantochloa apus (J.A. & J.H. Schultes) Kurz).

AbstractPreface study shows a possibility of bamboo to be bent and also proves that species affects to the results of mechanical properties. Bamboo was bent with the radius of curvature of 28 CM, as an example, used PVAc (industrial specification), and _formed manually in cold pressed at pressure setting at room temperature for 24 hours. In order to examine the best composition of optimal laminate effect, influence of node existing, and effect of shape; 24 samples of 2 cm x 2 cm x 30 cm were made and three replicates were prepared. In order to compare species influence were selected Dendrocalamus asper (Schultes f) Backer ex Heyne and Gigantochloa apus (J.A. & Schultes) Kurz that have different anatomical structure.Results indicate that node presence not significantly affects mechanical properties of Betting bamboo but significantly for Tali bamboo. To get the optimum mechanical properties, thickness of laminate is about 4 mm to 5 min. Decreasing of mechanical properties of laminated bended bamboo is not caused by node presence but by shape influence. The modulus of elasticity (MOE) value of Belling bamboo is decreasing almost 50% from the mechanical properties. Meanwhile, the MOE value of laminated straight bamboo of Tali decreases until 5 times from its mechanical properties, and the MOE value of laminated ['ended bamboo of decreases until 25% from laminated straight bamboo. Conversely, the modulus of rupture (MOR) of both of laminated bamboo is not significantly.

Fiksasi Bambu Gombong dan Tali Fixation of Gombong and Tali Bamboos

This research describes stress relaxation measurement to understand the fixation mechanism of compressive deformation of water saturated Gombong bamboo ( Gigantochloa pseduarundinaceae ) and Tali bamboo ( Gigantochloa apus ). Stress relaxations are measured by compressing the specimens in radial direction to 0.2 strains between 110oC and 190oC for various periods of time in electro oil hydraulic testing system equipped with an autoclave, which was heated by high temperatures saturated steam. The stress approximately disappears in 60min at 170oC, in 30min at 180oC, and in 20 min at 190oC for Gombong bamboo. On the other hand, the fastest release of stress is found for Tali bamboo. The plots of relationship between residual stress and strain recovery of Gombong and Tali bamboos lay on a single curve, respectively. The relationship is similar to that of Sugi wood by heating. However, the weight loss of the two bamboos is extremely higher than that of wood. The fixation is achieved at a weight loss of 20% for Gombong and Tali bamboos. From these results, the fixation mechanism is considerably dominated by the decomposition of hemicelluloses and lignin.