Study on the Molding Factors of Preparing High-Strength Laminated Bamboo Composites

TL;DR

This study explores how to make strong laminated bamboo composites using hot-pressing methods to support bamboo as a steel alternative.

Contribution

The study introduces an empirical approach using orthogonal experiments to optimize hot-pressing parameters for high-strength bamboo composites.

Findings

Higher density and lower moisture content correlate with improved mechanical strength in laminated bamboo composites.

A hot-pressing temperature of 150 °C and pressure of 50 MPa yield greater mechanical strength in the composites.

The composites show a compressed structure in the thickness direction after processing.

Abstract

To promote the development of the ‘Bamboo as a Substitute for Steel’ proposal, rotary cut bamboo veneers were applied to prepare a kind of high-strength laminated bamboo composite, which was achieved through the hot press molding method in this study. Orthogonal experiments of L9 (33) were performed, with hot-pressing temperature, pressure, and time considered as three influencing factors. Physical properties like density and moisture content, and mechanical properties like modulus of rupture (MOR), modulus of elasticity (MOE), shear strength, and compressive strength were tested for the samples. It can be obtained from the results of range analysis and ANOVA that higher density and lower moisture content were correlated with higher mechanical strength. Within the selected range of tested factors, a hot-pressing temperature and time of 150 °C and 10 min can contribute to higher density and lower moisture content, and the combination of 150 °C and 50 MPa can produce greater mechanical strength. In the thickness direction, the laminated bamboo composites displayed a notable compressed structure.

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