【摘要】 采用热风干燥获得压花用玫瑰花瓣,研究热风干燥温度、时间对玫瑰花瓣干燥特性、压花艺术美观性的影响,采用SEM表征玫瑰花瓣干燥过程表面微观形态特征,以期建立干燥过程动力学模型并计算动力学参数。结果表明,在试验设计温度范围内,热风干燥温度越高,时间越长,越有利于降低花瓣的水分,但会降低花瓣的艺术美观性,在热风40℃、840 min下干燥,可以获得具有较好艺术美感的玫瑰花瓣压花材料;干燥过程的有效扩散系数为2.524×10-10m2/s,活化能为11.322 k J/mol,动力学模型可用薄层干燥Page模型来描述。更多还原

【Abstract】 The rose petals were dried by hot-air drying to obtain the pressed flower materials. The influences of temperature or drying time on the drying characteristics,artistic beauty of rose petals were studied. Micromorphology of rose petals was characterized by SEM. The drying dynamic model was established by statistical analysis and the dynamic parameters were also calculated. The results showed that in the temperature range of experimental design,the rose petals drying rate was increased with the increasing of temperature or drying time. However,the higher temperature or longer drying time was not useful to improve the artistic beauty of rose petals. The artistic beauty of rose petals can be obtained under the drying condition of temperature 45 ℃,840 min. Connect modeling coefficients of the hot air drying was 2. 524 × 10-10m2/ s. Activation energy was 11. 322 k J / mol. The thin layer drying page model was suitable for describing the drying process of pressed rose petals by hot-air drying.更多还原