The Research On Loose Leaf Baking Equipment And Technology

At present, in our country, there are some problems of loose leaves bulk curing, such as the high cost of baking equipment and the lack of supporting baking process, which are restricting the development of the loose leaves bulk curing.Using Yunyan87as materials, this paper studied on the loose leaves bulk curing equipment with basket-style baking as the main type. Compared with the hang pole bulk curing, tobacco leaves’appearance quality, inner quality and economic characters were discussed under the6treatments of two loading densities and three different baking processes, and then the technical parameters of this loose leaves bulk curing equipment was further optimized. The main conclusions are as follows:1. The invention of assembly loose leaf loading tobacco basket as a new tobacco loading equipment, can effectively reduce the cost of flue-cured tobacco employment, compared with hang pole bulk curing it can save the labor of0.84Yuan/kg by dry tobacco and save labor costs by55.6%, increasing labor efficiency and reducing labor intensity greatly.2. In different baking processes, the tobacco leaves dehydrated slowly in the beginning. From the preliminary curing to the48h curing time, the average speed of moisture diminishing slowed. After the48hour, dewatered speed became more rapid. During48-108hours of curing, the dewatered speed of tobacco leaves reached fastest. The general trend showed that the loose leaf tobacco basket tobacco dehydrated slowly and time of dehydration in the baking process was longer than that of tobacco hanging rod baking, and moisture content changed slowly with the loading density increasing; in the same loading density, the higher the temperature of yellowing the faster the moisture content changed.3. In different baking processes, the change of starch content of leaves mostly happened in processes of yellowing and color setting. The time of loose leaves bulk curing was so longer; therefore, the starch content of loose leaves bulk curing is lower than hang pole bulk curing, and it was lower with the loading density increasing. In the same loading density, the higher the temperature of yellowing the lower the starch content was.4. In different baking processes, total sugar and reducing sugar content in carbohydrates also increased constantly with the time. When cured to72h, the total sugar and reducing sugar content of hang pole bulk curing reaches its maximum. The total sugar and reducing sugar content of loose leaf baking total sugar reached its maximum when baked to96h. Loose leaf baking experienced a longer baking time; therefore, the total sugar and reducing sugar content was higher after cured, but it decreased with time.5. Different treatment in the baking process, total nitrogen content of tobacco in the curing process was gradually reduced, and showed a decreasing trend with time. Within a certain range, the higher the loading density the lower the total nitrogen content of grilled leaf. And the total nitrogen content became lower with the temperature of yellowing increasing.6. Different treatment in the baking process, with the reduction of the protein, free amino acids of tobacco was in a corresponding increase. Within a certain range, the higher the loading density the lower the protein content was, and amino acid content became higher. The higher the temperature of yellowing the higher the protein content of cured tobacco, with lower amino acid content.7. The content of total chlorophyll in the different treatments of the baking process changed obviously, and it decomposed slowly in earlier stage, then decomposes quickly in middle period, and slow down to stopping on later stage. During12h to48h, the chlorophyll content decreased dramatically. With the loading density increasing, chlorophyll degradation speed became slower, and the higher temperature of yellowing the faster degradation of chlorophyll.8. Through the experiment showed that the assembly loose leaf loading tobacco basket appropriate loading density was40±kg/basket, and the baking process of low temperature and humidity baking Q3as well.