Process for Producing Fiber Pulp Utilizing Bamboo and Pulp Produced Using the Same

Abstract

Disclosed is a process for producing pulp utilizing bamboo, comprising finely cutting the bamboo into short segments and subjecting the cut bamboo to screening and washing processes to thereby produce dissolving pulp capable of achieving reduced consumption of chemical agents used during pre-hydrolysis and pulping processes and case of reaction, and having superior quality and high yield. Further, provided are also a process for producing fiber (dissolving) pulp utilizing bamboo, capable of preventing generation of dioxin by bleaching the pulp via ECF or TCF bleaching, and a pulp produced using the same.

1 . A method for producing fiber pulp using a bamboo, comprising:
 (1) a leaf removal step of removing a leaf from the bamboo;   (2) a longitudinal splitting step of longitudinally splitting the bamboo to have a width of 1.5-3 mm;   (3) a transverse cutting step of transversely cutting the split bamboo to a length of 10-30 mm to produce bamboo chips;   (4) a screening step of filtering out small fragments or impurities from the cut bamboo chips;   (5) a washing step of washing the bamboo chips with water to remove impurities, contaminants or dust;   (6) a prehydrolysis step of subjecting the washed bamboo chips to prehydrolysis using water or steam, and adding sulfur dioxide or sulfuric acid according to the degree of required prehydrolysis to promote the prehydrolysis so as to dissolve hemicellulose from the bamboo chips;   (7) a cooking step of introducing the bamboo chips into a digester, in which the ratio of a chemical liquor consisting of water, alkali and anthraquinone to the weight of the bamboo chips is adjusted to 1:3.5-6.0 (bamboo: chemical liquor), and the bamboo chips are cooked at high temperature, thus softening and pulping the bamboo chips;   (8) a contaminant removal step of removing contaminants with the bamboo using a centrifugal cleaner;   (9) a selection step of removing contaminants from the cooked pulp using a pressure screen, and feeding back an incompletely cooked portion of the bamboo into the digester;   (10) a washing and concentrating step, in which a decker is used to wash the pulp so as to remove the chemicals and to squeeze water so as to concentrate the pulp;   (11) a bleaching step of bleaching the washed and concentrated pulp;   (12) an acid treatment and washing step of removing metal ions present on the surface and inside the pulp; and   (13) a sheet preparation step of preparing the pulp into a sheet or a roll.   
   
   
       2 . The method of  claim 1 , wherein the prehydrolysis in the step (6) is performed in a state in which the liquor ratio of a water-containing liquor to the bamboo chips is 1.5-7:1. 
   
   
       3 . The method of  claim 1 , wherein, in the step (7), the alkali (as Na 2 O) added to water is 10-30% based on the oven-dry weight of the bamboo chips (i.e., (mass excluding the water content of the bamboo chips), and the anthraquinone (AQ) is added in an amount of 0.01-2%. 
   
   
       4 . The method of  claim 1 , wherein the bleaching of the step (11) is performed using bleaching stages according to an ECF (elementary chlorine free) or TCF (total chlorine free) bleaching process. 
   
   
       5 . The method of  claim 4 , wherein the bleaching stages are selected from the group consisting of DED, DEDD, DEDP, DEZP, DEOP, DEOZ, and PEOZ. 
   
   
       6 . The method of  claim 1 , wherein the acid treatment and washing step of the step (12) comprises adjusting the pH of the pulp to 3-5, treating the pulp with acid at room temperature for 20-110 minutes, and washing the treated pulp with clean water until the pH of the pulp reaches a natural pH range. 
   
   
       7 . Fiber pulp produced using a bamboo according to the method of any one of  claims 1  to  6 . 
   
   
       8 . The fiber pulp of  claim 7 , wherein the pulp is in the form of a sheet or a roll. 
   
   
       9 . The fiber pulp of  claim 8 , wherein the sheet-shaped pulp is produced using a bamboo having a thickness of 0.1-3 mm. 
   
   
       10 . The fiber pulp of  claim 8 , wherein the roll-shaped pulp consists of a wound web having a thickness of 0.1-1.5 mm.