预凋萎烟叶烘烤过程中水分迁移干燥及形态收缩特性  

Characterization of moisture migration and shape contraction of pre-wilted tobacco leaves during flue-curing

作　　者：魏硕[1] 徐宸[2] 王松峰[3] 汪代斌[2] 李常军[2] 江厚龙[2] 王洪峰 朱晓伟[2] 宋朝鹏[1] WEI Shuo;XU Chen;WANG Songfeng;WANG Daibin;LI Changjun;JIANG Houlong;WANG Hongfeng;ZHU Xiaowei;SONG Zhaopeng(College of Tobacco Science,Henan Agricultural University,Zhengzhou,Henan 450002,China;Chongqing Tobacco Company of China National Tobacco Corp,Chongqing 400023,Chinas;Key Laboratory of Tobacco Biology and Processing,Ministry of Agriculture,Tobacco Research Institute of CAAS,Qingdao,Shandong 266101,China)

机构地区：[1]河南农业大学烟草学院,河南郑州450002 [2]中国烟草总公司重庆市公司,重庆400023 [3]农业部烟草生物学与加工重点实验室,中国农业科学院烟草研究所,山东青岛266101

出　　处：《西北农林科技大学学报（自然科学版）》2018年第6期39-47,共9页Journal of Northwest A&F University(Natural Science Edition)

基　　金：中国烟草总公司重庆市公司资助项目(NY20150601070011)

摘　　要：【目的】研究预凋萎处理烟叶烘烤过程中水分迁移干燥及形态收缩特性,为烘烤工艺优化提供依据。【方法】以烤烟品种K326中部叶为试验材料,烤前对烟叶进行凋萎处理,研究烘烤过程中预凋萎烟叶温度、水分迁移态势、含水率和形态收缩的变化,并利用干燥收缩模型分析烟叶在烘烤过程中的失水收缩行为。【结果】与未进行预凋萎的烟叶相比,变黄期预凋萎烟叶叶温提高0.5~1℃,干筋期叶温、脉温提高0.5~2℃;烘烤过程中预凋萎烟叶主脉水分核磁信号强度明显较弱,主脉水分向叶片迁移效率较高,变黄期主脉的失水比率增大,主脉湿基含水率下降较快;预凋萎烟叶变黄期主脉直径收缩率增幅较大,烘烤过程中烟叶叶片和主脉体积比与水分比呈非线性变化,利用Quadratic收缩模型可以很好地预测烟叶叶片和主脉的失水收缩变化。【结论】与未进行预凋萎的烟叶相比,烘烤过程中预凋萎烟叶主脉水分迁移干燥及形态收缩加快。【Objective】This study investigated the characteristics of moisture migration,drying and morphological shrinkage of pre-wilted tobacco leaves during curing to provide basis for the optimization of curing process.【Method】The middle leaves of K326 were treated by wilting before curing,and the changes of tobacco leaf temperature,moisture migration trend,moisture content and shape contraction during curing were studied by compared with the control tobacco leaves.The shrinkage behavior of tobacco leaves during curing was also analyzed by common drying shrinkage models.【Result】Compared with control tobacco leaves,the temperature of pre-wilted tobacco leaves increased by 0.5-1 ℃ during yellowing stage,and temperature of tobacco lamina and midrib increased by 0.5-2 ℃ during stem drying stage.The midribmoisture nuclear magnetic signal degree of pre-wilted tobacco leaves was significantly weakened,the transfer efficiency of moisture from tobacco midrib to lamina was high,the dehydration distribution ratio of midrib increased during yellowing stage,and the wet basis moisture content decreased fast.The midrib diameter shrinkage ratio of pre-wilted tobacco leaves increased greatly,and the ratio change between volume and moisture of tobacco lamina and midrib was nonlinear,which can be well predicted by the Quadratic model.【Conclusion】Compared with control tobacco leaves,the moisture migration and shape contraction of prewilted tobacco leaves were accelerated during flue-curing.

关 键 词：凋萎烟叶 烟叶烘烤 叶温 水分迁移 形态收缩 

分 类 号：TS441[农业科学—烟草工业]