Kenaf core as a board raw material

Kenaf (Hibiscus cannabis) is an annual cane-like plant whose outer bast fiber is being considered as a newsprint raw material. In this work, the kenaf core material was examined as a possible raw material for low-density composites. The material was reduced to particles and made into 256 kg/m3 (16 lb./ft.3) panels. The panel test results were encouraging in comparison to current industrial insulation boards. No problems in processing (adhesive application, felting, or pressing) were encountered. The physical properties were: 1) internal bond about 200 kPa (29 psi): 2) modulus of rupture 1069 kPa (155 psi); 3) 2-hour thickness swell 18 percent; 4) 24-hour thickness swell 23 percent, 5) 2-hour linear expansion 1.0 percent and 24-hour linear expansion 2 percent; and 6) water absorption 200 to 250 percent (wt./wt.) after 2- and 24-hour water-soak tests, respectively. The normal acoustical absorption coefficient and thermal R-values were comparable to some commercial tiles and insulation panels. In summary, the kenaf core appears to be a potential raw material for low-density panels suitable for sound absorption and thermal resistance or corkboard-type products.

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