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Gluability of Bambusa Balcooa and Bambusa Vulgaris for Development of Laminated Panels Daisy Biswas, Samar Kanti Bose, M

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Gluability of Bambusa Balcooa and Bambusa Vulgaris for Development of Laminated Panels Daisy Biswas, Samar Kanti Bose, M World Academy of Science, Engineering and Technology International Journal of Chemical and Molecular Engineering Vol:11, No:3, 2017 Gluability of Bambusa balcooa and Bambusa vulgaris for Development of Laminated Panels Daisy Biswas, Samar Kanti Bose, M. Mozaffar Hossain 1 their production and cause enormous environmental pollution Abstract—The development of value added composite products during processing and on degradation. These factors have from bamboo with the application of gluing technology can play a created added interest in searching for alternatives that are vital role in economic development and also in forest resource natural and renewable, and could effectively replace wood conservation of any country. In this study, the gluability of Bambusa without posing any threat to our environment. Scientists balcooa and Bambusa vulgaris, two locally grown bamboo species of Bangladesh was assessed. As the culm wall thickness of bamboos believe that bamboo is such a resource that can replace wood. decreases from bottom to top, a culm portion of up to 5.4 m and 3.6 Bamboo, is a fast growing and high yielding renewable m were used from the base of B. balcooa and B. vulgaris, resource [1], and exhibits equal or better strength respectively, to get rectangular strips of uniform thickness. The color characteristics compared to wood available from fast growing of the B. vulgaris strips was yellowish brown and that of B. balcooa plantation species [2]-[4]. In Bangladesh, bamboo grows also was reddish brown. The strips were treated in borax-boric, bleaching abundantly both in forests and villages of Bangladesh. So far, and carbonization for extending the service life of the laminates. The preservative treatments changed the color of the strips. Borax–boric about nine genera and more than 33 species of bamboo have acid treated strips were reddish brown. When bleached with hydrogen been found in Bangladesh, out of which, seven are occurring peroxide, the color of the strips turned into whitish yellow. naturally in the forest areas. In the plains of Bangladesh, 26 Carbonization produced dark brownish strips having coffee flavor. cultivated species of bamboo are available [5]. Chemical constituents for untreated and treated strips were Bamboo is widely used in the housing sector and also in the determined. B. vulgaris was more acidic than B. balcooa. Then the cottage industries, especially for making handicrafts in round treated strips were used to develop three-layered bamboo laminated panel. Urea formaldehyde (UF) and polyvinyl acetate (PVA) were or split form, all over the world. In the modern world, glue used as binder. The shear strength and abrasive resistance of the laminated technology has helped in diversification of the panel were evaluated. It was found that the shear strength of the UF- application of bamboo composites in the area of architectural panel was higher than the PVA-panel for all treatments. Between the design and also fabrication of furniture. species, gluability of B. vulgaris was better and in some cases better China is far more advanced in the development of bamboo- than hardwood species. The abrasive resistance of B. balcooa is based composites than other bamboo producing countries. slightly higher than B. vulgaris; however, the latter was preferred as it showed well gluability. The panels could be used as structural There are about 100 factories that manufacture bamboo mat panel, floor tiles, flat pack furniture component, and wall panel etc. plywood, 25 produce bamboo strip plywood, 20 manufacture However, further research on durability and creep behavior of the bamboo curtain plywood, and 20 factories are producing product in service condition is warranted. bamboo particleboard. [6]. Bamboo product is exported to Japan, the USA, Hong Kong and Taiwan. Keywords—Bambusa balcooa, Bambusa vulgaris, polyvinyl It is evident that like other countries, bamboo composites acetate, urea formaldehyde. have bright prospects in Bangladesh but the research on gluing characteristics of bamboo panel product has not done yet. I. INTRODUCTION With this aim, the glue bonding characteristics of Bambusa HE survival of human beings and their living standard balcooa and Bambusa vulgaris, two thick-walled bamboos of Tdepend to a large extent on wood. With the continuous Bangladesh, was evaluated. increase in human population there is a gradual rise in the demand for more wood resources. As a result, forest resources II. MATERIALS AND METHODS are becoming scarce every day. B. balcooa and B. vulgaris culms were collected from People have tried various items like plastic goods, ceramic Nazirhat, a village in Chittagong District, Bangladesh. fittings with aluminum, and steel made items to substitute International Science Index, Chemical and Molecular Engineering Vol:11, No:3, 2017 waset.org/Publication/10006601 Generally the culm length of B. balcooa was 13.1 m, which wood in many of its uses. These materials have lots of was slightly higher than the B. vulgaris (12.8 m) and the culm limitations; they are non-renewable, need intensive energy in wall thickness of bamboos decreases from bottom to top. So, the culm portion of up to 5.4 m and 3.6 m from the base of B. Daisy Biswas is with Bangladesh Forest Research Institute, Chittagong, balcooa and B. vulgaris were used. These were converted into Bangladesh (e-mail: [email protected]). rectangular strips of uniform thickness. At first, the selected Samar Kanti Bose was with College of Environmental Science and culms were cross cut into 0.6 m long pieces and submersed Forestry, State University of New York, USA (e-mail: [email protected]). under water. After three weeks of submersion, the pieces were M. Mozaffar Hossain is with Institute of Forestry and Environmental air-dried to lower the moisture content to around 20%. Then Sciences, University of Chittagong, Chittagong, Bangladesh (e-mail: [email protected]). International Scholarly and Scientific Research & Innovation 11(3) 2017 225 scholar.waset.org/1307-6892/10006601 World Academy of Science, Engineering and Technology International Journal of Chemical and Molecular Engineering Vol:11, No:3, 2017 each of the dried pieces was split manually into six fragments, treatments. Borax – boric acid treated strips of B. vulgaris which were then converted into uniform rectangular strips. were slightly reddish brown with bright appearance (Fig. 1 Bamboo contains nutrients that provide excellent (c)) and the clear bamboo grain was seen. Under the same nourishment for insects and fungi. Three types of preservative treatment, the color of B. balcooa was pale reddish brown. treatment likely, borax-boric acid treatment, bleaching and Black streak in line was observed on the surface due to the carbonization, were given to the strips for ensuring the attack of staining fungi. When bleached with H2O2, the color extended service life of the product. of the B. vulgaris strips turned to whitish yellow (Fig. 1 (d)). Borax-Boric Acid Treatment: A 5% borax-boric acid Visually B. vulgaris strips were brighter compared to B. solution (w/v) was prepared in warm water maintaining borax balcooa strips, which revealed that color change due to to boric ratio of 3:2. The strips were first boiled for 2 h in bleaching was species dependent. Zaidon et al. [9] also water prior soaking, and then dipped in the hot borax-boric observed more whitish color of B. vulgaris compared to G. acid solution for 1 h for easy and uniform distribution of scortechinii and D. asper, the two Malaysian bamboos. preservatives. Carbonization produced dark brownish strips having coffee Bleaching: In this process, hydrogen peroxide solution was flavor (Fig. 1 (e)). Xie and Zhao [10] studied the technology used as bleaching agent. In addition, 2.54% borax–boric acid of pigmentation of bamboo strips by carbonization and dyeing solution (w/v) in the ratio 1.54: 1 was added. At first, the strips treatment. They concluded that the surface character of were put into the warm water of 50°C. Then the required carbonized bamboo strips was related to carbonizing amount of borax-boric acid was added to the warm water. temperature, time, and surface quality of untreated strips and When the temperature attained 70 °C, 2.5% hydrogen the age of the bamboo. Generally for high carbonizing peroxide (v/v) was added gently. The strips were bleached for temperature and time, the chromatism was greater. The aged 2 h maintaining a temperature of 80 °C. bamboo developed deeper color after carbonization. Carbonization: Carbonization of the strips was carried out in autoclaves at 130 °C for 3 h. The treated strips were taken out and kept for further processing. The moisture content of the strips became high after each treatment. The treated strips were dried in open air until it attained equilibrium moisture content (EMC). The dried strips were glued with two types of organic binders such as UF and PVA. Three layered parallel laminates of 12 mm thick were constructed with the treated strips. The assemblies were pressed at room temperature for 24 h maintaining a pressure of (a) (b) (c) (d) (e) 1 N/mm2. Test samples were prepared and then conditioned to attain uniform moisture content of about 9% to 10% before Fig. 1 Strips of different color (a) untreated B. balcooa, (b) untreated testing. The glue block shear test, and abrasive resistance were B. vulgaris, (c) borax-boric treated B. vulgaris (d) bleached B. vulgaris and (e) carbonized B. vulgaris measured in accordance with ASTM standards [7], [8]. B. pH and Buffering Capacity III. RESULTS AND DISCUSSION The pH and buffering capacity values of untreated and A. Surface Characteristics of Bamboo Strip treated strips of B. balcooa and B. vulgaris are given in Table I. From the results, it was seen that before treatment B. B. balcooa strips were reddish brown in color and there balcooa (pH 5.37) was less acidic than B.
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