Abstract:
Under the national initiative of promoting bamboo as a substitute for plastics,the refined manufacturing of bamboo-based container floorboards is crucial for improving board performance and controlling production costs.Addressing issues in previous studies such as the use of mixed-age raw materials and the reliance on experience for hot-pressing parameters,this study used radial bamboo curtains processed from 5-year-old
Phyllostachys edulis as the main material,supplemented with rubberwood and radiata pine veneers.An L
9(3
4)orthogonal experiment design was employed to investigate the influence of hot-pressing temperature,pressure,and time on the physical and mechanical properties of bamboo-based container floorboards.The results showed that hot-pressing pressure is the core factor governing the transverse static bending strength of the boards.It dominates interlayer bonding by controlling adhesive penetration at the bamboo interface.However,excessive pressure damages internal steam channels and reduces mechanical performance.Hot-pressing temperature is the dominant factor determining moisture content and immersion-delamination length,with 135 ℃ identified as the optimal balance point for adhesive curing and partial hemicellulose degradation--excessively high temperatures lead to adhesive embrittlement and thermal lag in the core layer.Base on a comprehensive analysis,the optimized process parameters were determined as follows:hot-pressing temperature of 135 ℃,hot-pressing pressure of 4.2 MPa,and hot-pressing time of 1.1 min·mm
-1.Verification tests demonstrated that the optimized process produced bamboo-based container flooring with excellent performance,the short-span shear force reached 12540 N,longitudinal and transverse modulus of elasticity were 10663.7 MPa and 5385.2 MPa respectively,longitudinal and transverse modulus of rupture were 113.8 MPa and 44.0 MPa respectively,and an impregnation-delamination length was only 12.2 mm,all of which meet or exceed the national standard requirements.This study provides reference for the refined and stabilizing manufacturing of bamboo-based container floorboards.