Abstract
The corresponding relationship between the coating rate and hot water soluble of paper-making reconstituted tobacco was studied in this paper which provided references for the research and application on the off-line detecting of coating rate. Through the accurate quantitative coating experiment, the hot water soluble of reconstituted tobacco by paper-making was determined through soxhlet extraction and coffee machine washing in this paper. And the corresponding relationship between the coating rate and hot water soluble determined by these two methods was also compared in order to make sure which method was more suitable. The results showed that the hot water soluble value was significantly positively correlated with coating rate (P<0.01), if the coating rate distribute between 38% and 46%. The linear equation obtained y=1.007x+1.387, R<sup>2</sup>=0.974 and y=0.932x+3.181, R<sup>2</sup>=0.985, respectively. The hot water soluble value determined by these two methods were different from each other. And the values determined by soxhlet extraction were mostly lower than the values detected by coffee machine washing; The coating rate derived from hot water soluble values determined by coffee machine washing was more closer to the actual values. It is feasible to derive the coating rate from hot water soluble values, and the method of coffee machine washing is more suitable for practical production testing, which has the advantage of short testing time and simple operation.
Highlights
Paper-making reconstituted tobacco (PRT) is a kind of product which can reduce the tar release amount effectively, its quality affects the quality of cigarette products directly, and the coating process is key to the whole produce process [1,2], well-controlled coating rate has great influence on reducing the fluctuation of product physical and chemical indicators and keeping the stability of product quality [3,4, 13,14]
As it can be seen in table 1, the actual testing value of coating rate was higher than its designed value, it might come from the actual operation error in the process of coating which was the inevitable, but the error was small, and could be controlled smaller than 1.00%, which could satisfy the accuracy requirement of quantitative coating experiment
Combined with figure 1 and figure 2, the results indicated a positive linear relationship between hot-water soluble substance yield tested through both methods and coating rate, and the method of coffee machine washing was better with high determination coefficient R2 than the method of soxhlet extraction, which indicated that there was better linear correlation between hot-water soluble substance yield by the method of coffee machine washing and coating rate, and the hot water soluble substance yield through this method was closer to measured coating rate
Summary
Paper-making reconstituted tobacco (PRT) is a kind of product which can reduce the tar release amount effectively, its quality affects the quality of cigarette products directly, and the coating process is key to the whole produce process [1,2], well-controlled coating rate has great influence on reducing the fluctuation of product physical and chemical indicators and keeping the stability of product quality [3,4, 13,14]. Developing the testing method of coating rate, especially the off-line testing method, is of great practical significance for cigarette manufacturing enterprises to control the production process and stabilize product quality. There are few domestic and international reports on the testing method of coating rate of paper-making reconstituted tobacco, especially the development of off-line testing method.
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