辊压开纤过程中竹材内部密实度和孔隙率变化分析

The Changes of Density and Porosity of Bamboo Material in the Process of Fiber Rolling

以开纤进程中竹材内部的密实度和孔隙率为研究对象,采用计算机断层扫描技术研究了竹片在连续辊压载荷作用下横截面分层解纤现象,分析了辊压次数对竹材内部孔隙率和密实度的影响规律。试验结果表明:随着辊压次数的增加竹材连续定向开纤过程经历了形态破坏、竹片密实化、竹片开裂间隙化和竹片开纤分离化几个阶段,不同阶段的变化可以通过孔隙密实比的数值大小而区分。试验表明:开纤完全的竹材在CT值上有明显的指标特征,当竹材间隙率大于80%,密实率小于5%,间隙密实比大于等于25时,竹片呈现纤维束完全分离状态。

In order to explore the changes of density and porosity of bamboo in the process of fiber manufacturing,the delamination phenomenon of bamboo cross-section under continuous rolling load was studied by using computer tomography technology,and the influence of rolling times on the porosity and compactness of bamboo was analyzed.The results showed that with the increase of rolling times,the continuous directional fiber manufacturing process of bamboo experienced several stages:morphological destruction,bamboo chip densification,bamboo chip cracking gap and bamboo fiber separation.The changes of different stages can be distinguished by the value of pore density ratio.The bamboo with complete fiber manufacturing had obvious index characteristics in CT value.When the gap ratio of bamboo was more than 80%,the density ratio was less than 5%,and the gap density ratio was greater than or equal to 25,the bamboo slices showed the state of complete fiber bundle separation.