Gluing of rubberwood
Material type:
TextPublication details: Rubberwood Processing and Utilization, Malaysia, 1994; p139-157 1994Subject(s): Summary: In manufacturing laminated rubberwood products of desired bonding quality, there is no doubt that the use of an appropriate adhesive and the application of proper gluing technique are essential. For products intended to be used indoors, resin adhesives with low moisture resistance or with cold-water resistance such as UF, modified polyvinyl acetate (PVAc) and EPI are commonly used. For exterior use, resin adhesives that are able to withstand heat and humidity such as the phenolic-based adhesives are oreferred. Based on laboratory assessment, rubberwood has been found to possess the desired bond integrity for exterior structural use particularly when glued with PRF resin adhesives. Nevertheless, the durability and creep (long-term deformation) properties of the species have to be considered before the material is used for structural purpose. The promising bonding results from CCA-treated rubberwood also suggest the possible use of the material in the preparation of the exterior structures such as sign-boards, tee-box markers, and so on. Testing of rubberwood of different age groups bonded with EPI, especially from 3, 8 and 14-year-old material, also showed that the young stock has great potential to be used for the manufacture of table tops, stair-cases and other non-structural products for indoor uses. On the otherhand, the same bonded material did not show any encouraging results in the assessment for structural use, as indicated by the poor wood failure results in BST and excessive delamination in BWSDT. As PRF is a more established adhesive for structural use, it is felt that more tests should be conducted using such adhesive before the younger age material is ruled out entirely from structural use.
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In manufacturing laminated rubberwood products of desired bonding quality, there is no doubt that the use of an appropriate adhesive and the application of proper gluing technique are essential. For products intended to be used indoors, resin adhesives with low moisture resistance or with cold-water resistance such as UF, modified polyvinyl acetate (PVAc) and EPI are commonly used. For exterior use, resin adhesives that are able to withstand heat and humidity such as the phenolic-based adhesives are oreferred. Based on laboratory assessment, rubberwood has been found to possess the desired bond integrity for exterior structural use particularly when glued with PRF resin adhesives. Nevertheless, the durability and creep (long-term deformation) properties of the species have to be considered before the material is used for structural purpose. The promising bonding results from CCA-treated rubberwood also suggest the possible use of the material in the preparation of the exterior structures such as sign-boards, tee-box markers, and so on. Testing of rubberwood of different age groups bonded with EPI, especially from 3, 8 and 14-year-old material, also showed that the young stock has great potential to be used for the manufacture of table tops, stair-cases and other non-structural products for indoor uses. On the otherhand, the same bonded material did not show any encouraging results in the assessment for structural use, as indicated by the poor wood failure results in BST and excessive delamination in BWSDT. As PRF is a more established adhesive for structural use, it is felt that more tests should be conducted using such adhesive before the younger age material is ruled out entirely from structural use.
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