ABSTRACT

This study investigated the effects of the size of various raw materials on the temperature and vapour pressure behaviour of wood-based panels during hot-pressing. Five types of materials (veneer, strand, particle, fibre, powder) were used as furnish and twelve different kinds of furnish were used for laboratory-scale wood-based composite panels. A press monitoring system (PressMAN Lite) was used for detecting the temperature and vapour pressure change in the centre of the mat panels. Results showed that the bulk density strongly relates to the size element. The highest bulk density was found in powder (sawdust, spruce) and particle (Hinoki blocks, Hinoki cubes, recycled wood). The uniform distribution of density strongly relates to the size of raw materials and in-plane density distribution could be an indicator for vapour pressure behaviour. The maximum vapour pressure corresponded to the plateau temperature for the mat-formed panels. The vapour pressure of the veneer was low even though the plateau temperature was high. The value of plateau temperature became higher in the order of particle, fibre, powder, and strand. The temperature behaviour of the veneer was different from that of mat-formed panels.

摘要

本研究调查了各种原材料的尺寸对人造板在热压过程中的温度和蒸气压行为的影响。五种类型的材料（单板、线材、颗粒、纤维、粉末）被用作配料，十二种不同的配料被用于实验室规模的人造板复合板。印刷机监控系统 (PressMAN Lite) 用于检测垫板中心的温度和蒸汽压力变化。结果表明，体积密度与尺寸元素密切相关。堆积密度最高的是粉末（锯末、云杉）和颗粒（扁柏块、扁柏立方体、回收木材）。密度的均匀分布与原材料的大小密切相关，面内密度分布可能是蒸汽压行为的指标。最大蒸气压对应于垫状板的平台温度。即使高原温度很高，单板的蒸气压也很低。平台温度的值按颗粒、纤维、粉末和股线的顺序变大。单板的温度行为不同于毡成型面板。