Manufacturing method of semichemical mechanical pulp from cornstalk

Abstract

Provided is a manufacturing method of semichemical mechanical pulp from cornstalks capable of offering environment-friendly pulp by reducing use of chemicals, offering a method for manufacturing new Korean pulp from cornstalks and enabling manufacture of characteristic paper. The method comprises the processes of crushing cornstalks into chips, applying heat and pressure to the crushed chips with such alkaline solution as caustic soda, refining them and bleaching them by adding such oxidizer as hydrogen peroxide.

1 . A method for manufacturing semichemical pulp from cornstalks comprising: 
 (1) a pretreatment process of cutting cornstalks to a size of 1 cm×1 cm to 5 cm×5 cm; and    (2) a refining process of refining the pretreated cornstalks with 0.05-15 wt % of caustic soda (a steaming solution), based on the total weight of the cornstalks, at 25-85° C. and at normal pressure or a pressure of 3-10 kg/cm 2 .    
   
   
       2 . A method for manufacturing semichemical pulp from cornstalks comprising: 
 (1) a pretreatment process of cutting cornstalks to a size of 1 cm×1 cm to 5 cm×5 cm; and    (2) a refining process of refining the pretreated cornstalks with 0.5-10 wt % of sodium sulfite or sodium bisulfite (a steaming solution), based on the total weight of the cornstalks, at 25-85° C. and at normal pressure or a pressure of 3-10 kg/cm 2 .    
   
   
       3 . A method for manufacturing semichemical pulp from cornstalks comprising: 
 (1) a pretreatment process of cutting cornstalks to a size of 1 cm×1 cm to 5 cm×5 cm;    (2) a chemical treatment process of adding a mixture solution of 0.05-3.0 wt % of caustic soda and 0.2-5 wt % of sodium sulfite, based on the total weight of the cornstalks, to the pretreated cornstalks and applying heat and pressure in the range of 25-45° C. and 3-10 kg/cm 2 ;    (3) a first refining process of defibrating the chemical-treated cornstalks with a refiner; and    (4) a second refining process of adding 5-20 wt % of hydrogen peroxide and 7-30 wt % of sodium silicate, based on the total weight of the cornstalks, to the cornstalks to refine and bleach them.    
   
   
       4 . The method of  claim 1  further comprising a heat treatment process of heating the cornstalks to 50-80° C. after (1) the pretreatment process.