摘要
针对烟芯材料在加工贮藏过程中极易受到环境湿度影响而产生吸湿或解湿的问题,对烟芯材料吸湿特性的评价技术进行梳理。指出:平衡含水率能够反映烟芯材料的持水能力,测试技术主要包括有损检测(烘箱法、气相色谱法、卡尔费休法、差量法)和无损检测(核磁法、微波法、红外法),前者具有较高的准确性,但耗时长;后者具有快速无损的优点,但易受样品形态、堆积状态等的影响。进一步地,水分赋存形态则可通过水分活度表征法和低场核磁共振法进行解析,水分活度反映了水分的可利用程度,而低场核磁共振法则能监测区分自由水和结合水,但会受其他含氢成分干扰。吸附热力学可通过等温吸湿曲线、吸附模型、吸附热进行探究,吸湿动力学可通过吸湿时间曲线及其相关模型进行探讨,但仅从热力学或动力学角度来评价吸湿特性可能存在评价维度的片面性、适用范围的局限性等问题。未来可将二者结合,以建立更为合理、适用性更广的烟芯材料吸湿特性评价技术,为烟草制品在加工贮藏过程中的吸湿特性研究提供参考。
In response to the problem of moisture absorption or desorption of tobacco core materials during processing and storage,which were easily affected by environmental humidity,this paper summarized the relevant evaluation techniques for the moisture absorption characteristics of tobacco core materials.It was pointed out that the equilibrium moisture content could reflect the water holding capacity of tobacco core materials,and the testing techniques include non-destructive testing(oven method,gas chromatography,Karl Fischer method,difference method)and non-destructive testing(nuclear magnetic method,microwave method,infrared method).The former had high accuracy but took a long time.The latter had the advantage of fast and non-destructive testing,but was easily affected by sample morphology,stacking state,and other factors.Furthermore,the water status could be analyzed by water activity and low field nuclear magnetic resonance.Water activity reflected the availability of water,while low field nuclear magnetic resonance method could monitor and distinguish free water and bound water,but it was subject to interference from other hydrogen-containing components.Adsorption thermodynamics could be explored through isothermal hygroscopicity curves,adsorption models,and adsorption heat,while hygroscopicity kinetics could be explored through hygroscopicity time curves and related models.However,evaluating hygroscopicity characteristics solely from a thermodynamic or kinetic perspective might have limitations in evaluation dimensions and applicability.The future evaluation technology could combine the two to establish a more reasonable and applicable evaluation technique for the moisture absorption characteristics of tobacco core materials,providing reference for the research on the moisture absorption characteristics of tobacco products during processing and storage.
作者
郑赛晶
刘广超
陈嘉彬
高峄涵
张轶辉
邓锐杰
ZHENG Saijing;LIU Guangchao;CHEN Jiabin;GAO Yihan;ZHANG Yihui;DENG Ruijie(Shanghai New Tobacco Products Research Institute Co.,Ltd.,Shanghai 201315,China;Shenzhen New Tobacco Product Co.,Ltd.,Shenzhen 457001,China;College of Biomass Science and Engineering,Sichuan University,Chengdu 610065,China)
出处
《轻工学报》
CAS
北大核心
2024年第3期109-118,共10页
Journal of Light Industry
基金
中国烟草总公司重大专项项目(110202101019(XX-05))。
关键词
吸湿特性
烟芯材料
动力学
热力学
评价技术
moisture absorption property
tobacco core material
thermodynamics
dynamics
evaluation technique
