Preparation method of tobacco sheets with a reduced quantity of wood pulp fibers

Abstract

The present invention provides a preparation method of tobacco sheets with a reduced quantity of wood pulp fibers, and belongs to the technical field of reconstituted tobacco. The method includes the steps of: cooking tobacco stem materials by alkaline process, and filtering and washing the cooked tobacco stem materials to obtain tobacco stem fibers; generating mixed pulp by mixing wood pulp fibers, tobacco pulp, filling materials, water and the tobacco stem fibers together as per certain proportions, and subjecting the mixed pulp to a papermaking process in a paper machine to obtain tobacco sheets. By means of adding tobacco stem fibers, the present invention effectively reduces the quantity of wood pulp fibers, ensures the continuous operation of the paper machine, and effectively improves the bulk and tensile index of prepared tobacco sheets. Furthermore, the present invention reduces the quantity of wood pulp fibers, improves the flavor of tobacco, and effectively relieves the negative effect of excessive wood pulp fibers on the flavor of tobacco.

What is claimed is: 
     
         1 . A preparation method of tobacco sheets with a reduced quantity of wood pulp fibers, comprising the following steps:
 (1) cooking tobacco stem materials by alkaline process, and filtering and washing the cooked tobacco stem materials to obtain tobacco stem fibers; and   (2) generating mixed pulp by mixing wood pulp fibers, tobacco pulp, filling materials, water and the tobacco stem fibers obtained in step (1) together as per certain proportions, and subjecting the mixed pulp to a papermaking process in a paper machine to obtain tobacco sheets.   
     
     
         2 . The preparation method according to  claim 1 , wherein the tobacco stem fibers in step (1) have a length of 0.1-0.5 mm and a diameter of 0.5-2 μm. 
     
     
         3 . The preparation method according to  claim 1 , wherein in step (1), strong alkali, the tobacco stem materials and water are mixed and then cooked, the strong alkali has a mass concentration of 15-50%, and a mass ratio of the tobacco stem materials to the strong alkali is (4.5-5.5):1. 
     
     
         4 . The preparation method according to  claim 2 , wherein in step (1), strong alkali, the tobacco stem materials and water are mixed and then cooked, the strong alkali has a mass concentration of 15-50%, a mass ratio of the tobacco stem materials to the strong alkali is (4.5-5.5):1. 
     
     
         5 . The preparation method according to  claim 1 , wherein in step (1), the cooking is conducted at a temperature of 150-180° C. for a time of 1-4 h. 
     
     
         6 . The preparation method according to  claim 2 , wherein in step (1), the cooking is conducted at a temperature of 150-180° C. and a time of cooking is 1-4 h. 
     
     
         7 . The preparation method according to  claim 1 , wherein in step (2), the tobacco stem fibers in the mixed pulp have a mass content of 0.1-3%. 
     
     
         8 . The preparation method according to  claim 1 , wherein in step (2), the wood pulp fibers in the mixed pulp have a mass content of 14-22%. 
     
     
         9 . The preparation method according to  claim 7 , wherein in step (2), the wood pulp fibers in the mixed pulp have a mass content of 14-22%. 
     
     
         10 . The preparation method according to  claim 1 , wherein in step (2), the filling materials comprise calcium carbonate. 
     
     
         11 . The preparation method according to  claim 1 , wherein in step (2), the filling materials in the mixed pulp have a mass content of 8-20%. 
     
     
         12 . The preparation method according to  claim 1 , wherein in step (2), the filling materials comprise calcium carbonate and wherein the filling materials in the mixed pulp have a mass content of 8-20%. 
     
     
         13 . The preparation method according to  claim 1 , wherein in step (2), the tobacco pulp comprises tobacco stem pulp and tobacco leaf pulp, and the tobacco pulp has a mass concentration of 5-15%. 
     
     
         14 . The preparation method according to  claim 1 , wherein in step (2), the mixed pulp has a mass concentration of 0.1-1.0%. 
     
     
         15 . The preparation method according to  claim 7 , wherein in step (2), the mixed pulp has a mass concentration of 0.1-1.0%. 
     
     
         16 . The preparation method according to  claim 10 , wherein in step (2), the mixed pulp has a mass concentration of 0.1-1.0%. 
     
     
         17 . The preparation method according to  claim 13 , wherein in step (2), the mixed pulp has a mass concentration of 0.1-1.0%.