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At the same time, apart from cooperating with construction companies and contractors, the Group is directly selling WWCB within specific application areas and geographical regions, while improving its product specifications and quality in an effort to optimize its sales network.
The Group has expanded into the eco-friendly construction materials business by introducing energy-conserving Wood Wool Cement Board ("WWCB") wall materials production lines from the Netherlands in 2010.
Three bending test samples measuring 75 by 338 mm were cut from each board with their long axes parallel to those of the WWCBs. In the two types of boards with a cross-ply structure, this resulted in specimens in which the orientation of surface strands was either parallel or perpendicular to the length of the oriented WWCBs.
The density and MC of the three types of WWCBs manufactured from poplar and radiata pine are shown in Table 2.
Therefore, it is clear that flexural strengths of WWCBs can be significantly increased by aligning strands parallel to board length.
The increase in the fiexural strength properties of WWCBs as a result of strand orientation was compared with that of other composites that employ strand orientation as a means of improving strength properties (Table 4).
The improvement in MOR and MOE of WWCBs as a result of strand orientation and the lack of significant interaction of orientation and species on strength properties (Table 3) suggest that flexural properties of WWCBs made from other species that are compatible with cement could be similarly improved by manipulation of strand orientation during mat formation.
Poplar WWCBs showed significantly higher MOR (p = 0.05) and MOE (p = 0.02) than radiata pine boards (Fig.
The manufacture of oriented WWCBs involved the deliberate placement of cement-coated wood-wool strands in 3 layers with strands on the surface of mats oriented perpendicular to those in the core.
The alignment of strands at the surfaces of oriented radiata pine and poplar WWCBs is shown in Table 5.
It is possible to significantly increase the flexural strength properties of WWCBs by aligning their wood constituents to produce boards with a structure analogous to OSB.
Manual orientation of strands as a method of improving the bending properties of WWCBs required no additional equipment or significant modification of the process used to manufacture boards in the Philippines.
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