Experimental investigations and model validation of compression rheological behavior in bamboo scrimber during the hot-pressing process

IF 2.4 3区农林科学 Q1 FORESTRY

European Journal of Wood and Wood Products Pub Date : 2025-01-16 DOI:10.1007/s00107-025-02200-8

Yanglin Ge, Jianxiong Lyu, Xingong Li, Xiaofeng Hao, Jianzheng Qiao, Kang Xu, Yiqiang Wu, Xianjun Li

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Abstract

The current study investigated the rheological behavior of a heat-treated and phenolic resin-impregnated bamboo bundle slab during the hot-pressing process. These findings have significant implications for advancing hot-pressing technology, conserving energy, and reducing emissions in the bamboo scrimber industry. The results revealed that stress relaxation played a dominant role in the hot-pressing process after reaching the target thickness of the slab, which was influenced by compression deformation stress, hygrothermal stress, and phenolic resin polycondensation. Higher hot-pressing temperature and initial moisture content (IMC) led to increased hygrothermal stress, causing delayed stress relaxation. Increasing target thickness or reducing target density could alleviate hygrothermal stress while phenolic resin curing facilitated stress relaxation by constraining compression deformation. Both the three-element generalized Maxwell model (average R² = 0.95) and the five-element generalized Maxwell model (average R² = 0.98) effectively described the slab stress relaxation; however high IMC caused excessive vapor pressure, leading to unsatisfactory fitting of the stage.

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竹材热压过程中压缩流变特性的实验研究与模型验证

研究了酚醛树脂浸渍的热处理竹束板在热压过程中的流变行为。这些发现对推进热压技术、节约能源和减少竹材工业的排放具有重要意义。结果表明：在板坯达到目标厚度后的热压过程中，应力松弛起主导作用，受压缩变形应力、湿热应力和酚醛树脂缩聚的影响；较高的热压温度和初始含水率（IMC）导致湿热应力增加，导致应力松弛延迟。增加靶材厚度或降低靶材密度可以缓解湿热应力，而酚醛树脂固化通过抑制压缩变形促进应力松弛。三元广义Maxwell模型（平均R2 = 0.95）和五元广义Maxwell模型（平均R2 = 0.98）均能有效地描述板坯应力松弛；然而，高内压导致蒸汽压过高，导致舞台拟合不理想。

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来源期刊

European Journal of Wood and Wood Products 工程技术-材料科学：纸与木材

CiteScore

5.40

自引率

3.80%

发文量

124

审稿时长

6.0 months

期刊介绍： European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.