The Relationship Between Tobacco Temperature And Barn Environmental Factors And The Influence Of Temperature On The Curing Quality Of Tobacco During The Intensive Curing Process

With the temperature variation of bulk curing process of tobacco as themain research object, by recording and analyzing the leaf temperature, humidity and windspeed data of central and upper leaf which is in smoke folder and inserted skewerclamps ways in the whole curing process, detecting the samples and related data that inbaking process and after baking tobacco, it analyses the relationship of tobacco leaf bodytemperature and main veins and water content of leaf, roast temperature and humidity,wind speed and other factors, also the influence on the baking quality of tobacco. Themain findings are as follows:1. In the intensive baking process, according to the comprehensive analysis of drybulb temperature, wet bulb temperature, relative humidity, wind speed and otherenvironmental factors, in the cigarette clamp and leaf inserted skewer two ways, thetemperature change trends of the central and upper tobacco leaves in curing process arebasically the same, it has four stages: warm-up phase, occurred within0-32h before openroast, at this time tobacco leaf mainly rely on its own breathing and curing barnheating to raise its temperature, to provide the basic conditions for the conduct of tobaccophysiology and biochemistry; Steady temperature stage, occurred between32-64h, thattobacco baking yellowing stage and color fixing early stage, at this time, the magnitude ofenvironmental change in curing barn is small，which creates conditions for the relativelystable tobacco leaf temperature; slow heating phase, occurred after grilled64-96h, thattobacco leaf baking color fixing later stage, at this time, with the increase of the amount ofair exchange inside and outside the curing barn， leaf water loss rate increases，alongwith the rise in temperature of tobacco, but more slowly; rapid heating stage, occurredafter open roast96h, baking until the end, that tobacco baking color fixing late stage andstem-drying stage, when the blade is basically dry, the relative humidity of curing barnmaintained at a low level, leaf temperature is close to dry bulb temperature rise rate, withthe rapid increase in the dry bulb temperature it increases. 2. According to the analysis of the leaf temperature and environmental factorspath, we know, in the warm-up phase, steady temperature stage, slowly warming phase andrapid heating stage which tobacco leaf body temperature changes, the dominantenvironmental factors which influence the tobacco upper leaf temperature change incigarette clamp way are relative humidity and wind speed, dry bulb temperature, dry bulbtemperature, relative humidity; the dominant environmental factors which influencetobacco central leaf temperature changes in folder ’s are dry bulb temperature, dry bulbtemperature and relative humidity, dry bulb temperature, relative humidity ball; thedominant environmental factors which influence upper leaf temperature change of looseleaf inserted skewer are wet bulb, relative humidity, relatively wet bulb and dry bulbtemperature, dry bulb temperature; the dominant environmental factors which influenceupper leaf temperature change of loose leaf inserted skewer is dry bulb temperature,relative humidity, dry bulb temperature and relative humidity, dry bulb temperature.3.In the intensive baking process, two ways of the cigarette clamp, leaf insertedskewer, according to the central and upper leaves of different tissue water content (thedependent variable) and tobacco leaf body temperature change(independent variable)regression analysis, we know, the floating range of linear regression coefficient ofdetermination that tobacco leaf body temperature changes, and leaf water content，moisture content of the main vein, whole leaf water content after removing the main vein,are0.851～0.895,0.802～0.914,0.919～0.971; the regression coefficients are floatingbetween-2.2311～-2.8286,-2.0457～-2.2648,-2.0434～-2.652. Two coefficientsfloating range of the four treatments are smaller, and their values are relatively close. Butin the baking process, as the main vein and tobacco leaf organizations in the bakingprocess water loss time and water loss rate is different, the extent effected by leaftemperature are also different, which leads to the regression coefficient of determinationand the regression coefficient of different tissue water content and leaf temperaturechanges have differences. But overall, in the baking process, in the cigarette clamp andleaf inserted skewer two loading ways, there is a real linear relationship between thecentral and upper leaf temperature change and leaf water content (water loss rate). Leaftemperature change and water loss rate has a close relationship.4. In the intensive baking process, in two loading ways, the floating range of thelinear regression coefficient of determination of the central and upper leaf tobacco colorparameters (the dependent variable) brightness value (L*), redness value (a*),yellowness value (b*) and tobacco leaf body temperature (independent variable) are 0.897～0.965,0.896～0.978,0.893～0.924，and the floating range of the regressioncoefficients are0.358～0.538,0.491～0.803,0.042～0.365. In the baking process,comparison between the two mounted smoke ways, the color parameter tobacco leaftemperature and brightness values of the middle of the linear regression coefficient, theupper leaves of loose leaf inserting drill compared with the other three treatments,regression coefficient of determination is the maximum, and the differences are larger.The regression coefficient values of the other three treatments are closer. Comparison oflinear regression coefficient between yellow value and tobacco leaf temperature change,the central leaf’s coefficient is0.042, the minimum; the upper leaf’s coefficient in looseleaf inserted skewer is0.3658, the maximum. Overall, in the intensive baking process,which tobacco temperature changes has a close relationship with the middle and upperleaves in cigarette clamp and leaf inserted skewer two ways, that influenced by leaftemperature change. It needs to control the leaf temperature so as to control tobacco leafcolor in baking process.5. In the baking process, the upper and central tobacco leaf temperature changes has aclose relationship with the changes in starch, total sugar, reducing sugar, total nitrogen,protein and other major chemical components in cigarette clamp and leaf inserted skewertwo ways. There is a positive correlation between total sugar and reducing sugar content inleaf temperature changes, with the tobacco leaves’ body temperature increases, the totalsugar and reducing sugar content tended to increase, and the regression equationcoefficients of determination were above0.80; there is a negative correlation amongchanges in starch, total nitrogen and protein and leaf temperature. That is, with thetemperature of the tobacco leaf increases, the three levels gradually decreased in the bakingprocess; the regression coefficients were0.770and above. It can be seen, in the bakingprocess, combined with barn temperature, humidity, wind speed and other environmentalfactors, appropriate regulation of tobacco leaf body temperature is conducive todegradation and transformation of carbohydrates, nitrogen compounds and othermacromolecules, which has positive implications for improving the quality of tobaccocuring.