In line with environmental issues and forest sustainability, tree bark of two species from tropical rain forests i.e. benuang (Octomeles sumatrana/BN) and duabanga (Duabanga moluccana/DB) was used as filler for phenol formaldehyde resin (PF-filler). The main objective of the research was to analyze effect of tree barks as PF-filler on bonding strength of BN and DB glulams produced. Four glue mixture compositions with ratio PF, technical filler, and tree bark filler, respectively are 10: 0: 0 (A); 10: 1.5: 0.5 (B); 10: 1.25: 0.75 (C); and 10: 1: 1 (D) were prepared. Characteristics of tree bark and glue mixtures were also investigated. Glulam parameters i.e. moisture content, density, delamination, bonding strength, wood failure, and formaldehyde emission were determined following JAS 1152. Results showed bonding strength was influenced by wood species and glue mixture composition. The B composition—the lowest ratio of tree bark filler—is the best for BN glulam, while for DB glulam D composition—the highest ratio of tree bark filler—was the best. Generally, tree bark filler improved the bonding strength, however, without bark as PF-filler, the failure occurred on the glue line. Furthermore, DB bark is more potential to be utilized as PF-filler.

中文翻译：

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孟加拉和杜邦胶的树皮作为酚醛填料的粘合强度

出于环境问题和森林可持续性的考虑，使用了热带雨林中的两种树皮，即Benuang（Octomeles sumatrana / BN）和duabanga（Duabanga moluccana / DB）作为酚醛树脂的填料（PF填料）。该研究的主要目的是分析作为PF填料的树皮对生产的BN和DB胶合胶粘结强度的影响。比例为PF，工业填料和树皮填料的四种胶水混合物组成分别为10：0：0（A）；10：1.5：0.5（B）; 10：1.25：0.75（C）; 制备10∶1∶1（D）。还研究了树皮和胶水混合物的特性。根据JAS 1152确定了胶合层参数，例如水分含量，密度，分层，粘合强度，木材破坏和甲醛释放量。结果表明，粘合强度受木材种类和胶合剂组成的影响。B组成（树皮填料的比例最低）对BN胶合剂是最好的，而DB胶合剂D组分（树皮填料的比例最高）是最好的。通常，树皮填充剂可提高粘合强度，但是如果没有树皮作为PF填充剂，则粘合线上会发生破坏。此外，DB树皮更有可能被用作PF填料。