Investigating the drying characteristics and curing behavior of bamboo scrimber base unit: Phenolic resin impregnated heat-treated bamboo bundles

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2024-11-09 DOI:10.1016/j.indcrop.2024.119970

Xiaoman Wang, Jianxiong Lyu, Xianjun Li, Xingong Li, Xiaofeng Hao, Jianzheng Qiao, Yiqiang Wu, Kang Xu

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引用次数: 0

Abstract

The PHB serves as the fundamental unit of bamboo scrimber, with its drying rate, moisture content (MC) distribution, and post-drying curing degree being crucial factors for enhancing production efficiency, ensuring high-quality hot pressing, and optimizing the physical-mechanical properties of bamboo scrimber. This study investigated the impact of drying temperatures (50 ℃, 60 ℃, 70 ℃, 80 ℃) and stacking patterns (P₁, P₃, P₆, P₁₂) on the drying rate and MC distribution uniformity in PHB. Additionally, the curing behavior of PHB was examined using the differential scanning calorimetry (DSC) method. The results revealed that both the drying temperature and stacking patterns had a significant effect on the drying rate and MC distribution uniformity in PHB (P < 0.001). The MC of PHB exhibited significant variations at different locations during low-temperature drying, whereas increasing the temperature not only improved the uniformity in MC distribution. The greater number of layers made it easier for PHB to intertwine with each other, thereby reducing the flow channels for dry media and impeding heat/mass exchange. Consequently, this resulted in a decrease in both drying rate and MC distribution uniformity. Compared to PF resin (155.95 kJ/mol), the apparent activation energy of PHB decreased (104.78 kJ/mol) and the curing reaction rate increased. Within the temperature range of 50 ℃ to 80 ℃, under identical conditions, PHB exhibited a significantly higher degree of curing compared to PF resin. The differences in final curing degrees between them were 0.47, 0.31, 0.10, and 0.01 respectively. This indicated that PHB was more susceptible to undergoing a curing reaction during the drying process. Therefore, it is recommended to maintain the drying temperature at 60 ℃ and employ the P₃ stacking pattern. The findings of this paper hold great significance in informing the design and optimization of the PHB drying process.

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研究竹蔑基材的干燥特性和固化行为：酚醛树脂浸渍热处理竹束

PHB是竹材的基本单位，其干燥速率、含水率（MC）分布和干燥后的固化程度是提高生产效率、确保热压质量和优化竹材物理机械性能的关键因素。本研究探讨了干燥温度（50 ℃、60 ℃、70 ℃、80 ℃）和堆叠模式（P1、P3、P6、P12）对 PHB 干燥速率和 MC 分布均匀性的影响。此外，还使用差示扫描量热法（DSC）研究了 PHB 的固化行为。结果表明，干燥温度和堆叠模式对 PHB 的干燥速率和 MC 分布均匀性均有显著影响（P < 0.001）。在低温干燥过程中，PHB 的 MC 在不同位置有明显的变化，而提高温度不仅能改善 MC 分布的均匀性，还能提高干燥速度。更多的层数使 PHB 更容易相互缠绕，从而减少了干燥介质的流动通道，阻碍了热量/质量交换。因此，这导致了干燥速率和 MC 分布均匀性的降低。与 PF 树脂（155.95 kJ/mol）相比，PHB 的表观活化能降低（104.78 kJ/mol），固化反应速率增加。在 50 ℃ 至 80 ℃ 的温度范围内，在相同条件下，PHB 的固化度明显高于 PF 树脂。它们的最终固化度分别相差 0.47、0.31、0.10 和 0.01。这表明 PHB 在干燥过程中更容易发生固化反应。因此，建议将干燥温度保持在 60 ℃，并采用 P3 堆积模式。本文的研究结果对 PHB 干燥过程的设计和优化具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.