Optimization of Filler Modification and Retention Aids to Improve Pulp Retention Rate in Reconstituted Tobacco Sheet by Stepwise Regression Method
A uniform experimental design method and quadratic multiple regression equation were used to investigate the effects of the combination of filler modifiers(tobacco fragment pulp or softwood pulp,cationic starch,sodium stearate,sodium hexametaphosphate)and multiple retention aids(chitosan,cationic guar gum,bentonite)on the pulp retention rate,and the distribution uniformity of calcium carbonate in the reconstituted tobacco sheet.The results showed that chitosan,guar gum,bentonite,and softwood pulp were more beneficial to improve the pulp retention rate among the factor contributions.In the two-factor interaction diagram of tobacco fragment pulp and softwood pulp,there were five different trends.The mass-pro-duced(unmodified)reconstituted tobacco sheet had the pulp retention rate of 68.8%and the tensile strength of 0.378 kN/m.Optimising the parame-ters through regression equations and verified experimentally,the pulp retention rate of the reconstituted tobacco sheets achieved 92.9%and 94.9%,and the tensile strength increased by 30.2%and 28.8%respectively,when multiple retention aids were combined with tobacco fragment pulp and softwood pulp modification.The composites,formed by calcium carbonate wrapping tobacco fragment pulp and softwood pulp,were evenly all rela-tively uniformly dispersed in the reconstituted tobacco sheets.
万方数据
维普
