Ajeng Rahmawati, Ina Lidiawati, Kustin Bintani Meiganati, Ignasia Maria Sulastiningsih

The Quality Bonding of Sembilang Bamboo (Dendrocalamus giganteus Munro) Using Isocyanate Adhesive

Introduction

the quality bonding of sembilang bamboo (dendrocalamus giganteus munro) using isocyanate adhesive. Explore Sembilang bamboo (Dendrocalamus giganteus) bonding quality using isocyanate adhesive. Assess wettability and bonding strength for laminated boards, revealing good wettability & strong dry bond.

Abstract

The increasing demand for wood-based products is not balanced by a sufficient timber supply, creating a need for alternative materials such as bamboo. Dendrocalamus giganteus Munro (bamboo sembilang) is a promising substitute; However, its inherent limitations require modification, particularly through lamination technology. Adhesion plays a crucial role in this process as it strongly affects surface wettability and bonding strength.One important factor in the conversion of bamboo into laminated boards is the adhesion process, as it significantly affects the wettability properties and bond strength. This study aimed to evaluate the wettability characteristics of bamboo sembilang and its bonding strength with isocyanate adhesive, considering the effects of surface orientation, adhesive spread rate, and pressing time. Wettability was assessed using the contact angle method and the Corrected Water Absorption Height (TAAT), while bonding strength was tested under dry and wet conditions. Results showed an average contact angle of 33,40° on the inner surface and 35,14° on the outer surface of bamboo, with a TAAT value of 103.51 mm, indicating good wettability. The average dry bonding strength was 68.4 kg/cm², meeting the JPIC (2007). These findings demonstrate that bamboo sembilang has strong potential as a raw material for laminated boards with reliable bonding performance when using isocyanate adhesive.

Review

The presented study addresses a pertinent issue in material science: the search for sustainable alternatives to traditional timber due to increasing demand and dwindling supply. Focusing on *Dendrocalamus giganteus Munro* (sembilang bamboo), the research highlights its potential as a substitute material, particularly when modified through lamination technology. Given that adhesion is a critical determinant of performance in laminated composites, this investigation specifically aimed to evaluate the wettability characteristics and bonding strength of sembilang bamboo with isocyanate adhesive, considering various processing parameters such as surface orientation, adhesive spread rate, and pressing time. Methodologically, the authors employed a combination of established techniques to assess the bamboo's adhesive properties. Wettability was thoroughly investigated using both the contact angle method, providing precise measurements for inner (33.40°) and outer (35.14°) surfaces, and the Corrected Water Absorption Height (TAAT), which yielded a value of 103.51 mm. These results collectively indicate favorable wettability, a prerequisite for strong adhesion. Furthermore, bonding strength was evaluated under both dry and wet conditions. The abstract specifically reports a commendable average dry bonding strength of 68.4 kg/cm², which is noted to meet the stringent requirements of the JPIC (2007) standard, underscoring the robustness of the adhesive bond under normal conditions. The findings presented strongly suggest that sembilang bamboo possesses considerable potential as a viable raw material for high-quality laminated boards when utilizing isocyanate adhesive. The demonstrated good wettability and compliant dry bonding strength are crucial indicators of its suitability for structural applications. While the abstract mentions testing under wet conditions, the specific results for wet bonding strength are not detailed, which could provide further insight into the material's durability in challenging environments. Nevertheless, this study makes a valuable contribution to the ongoing efforts to develop sustainable building materials, providing empirical evidence that supports the use of *Dendrocalamus giganteus Munro* in engineered bamboo products, thereby offering a promising pathway to reduce reliance on conventional timber resources.

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