Method for Processing High Hemicellulose Pulp in Viscose Manufacture

Abstract

Pulp with a high hemicellulose level is blended with a dissolving grade pulp and converted to viscose. Blending can be performed during steeping or after steeping. Spinning of the viscose containing the blend, into filaments yields fibers with strength properties that are at least equal to those of the dissolving pulp alone.

1 . A method comprising the steps of
 providing a non dissolving grade pulp with a hemicellulose level of at least 10%;   providing a dissolving grade pulp with a hemicellulose level less than 4%;   blending said non dissolving grade pulp with said dissolving grade pulp;   processing said blended pulp into viscose;   processing said viscose into fiber.   
     
     
         2 . The method of  claim 1  wherein the hemicellulose level of the non dissolving grade pulp is at least 12%. 
     
     
         3 . The method of  claim 1  wherein the S 18  of the non dissolving grade pulp is at least 13%. 
     
     
         4 . The method of  claim 1  wherein the S 18  of the non dissolving grade pulp is at least 15%. 
     
     
         5 . The method of  claim 1  wherein the S 10  of the non dissolving grade pulp is at least 14%. 
     
     
         6 . The method of  claim 1  wherein the S 10  of the non dissolving grade pulp is at least 16%. 
     
     
         7 . The method of  claim 1  wherein the D.P. of the non dissolving grade pulp is at least 700 but 1200 or less. 
     
     
         8 . The method of  claim 1  wherein the D.P. of the non dissolving grade pulp is at least 800 but less than about 1100. 
     
     
         9 . The method of  claim 1  wherein the D.P. of the non dissolving grade pulp is at least 900 but less than about 1000. 
     
     
         10 . The method of  claim 1  wherein the non dissolving grade pulp with high hemicellulose is blended with the dissolving grade pulp in a sheet steeping process. 
     
     
         11 . The method of  claim 1  wherein the non dissolving grade pulp with a high hemicellulose level is blended with the dissolving grade pulp in a slurry steeping process. 
     
     
         12 . The method of  claim 1  wherein the non dissolving grade pulp is blended with the dissolving grade pulp at a 50% by weight level or less. 
     
     
         13 . The method of  claim 1  wherein the non dissolving grade pulp is blended with the dissolving grade pulp at a 35% by weight level or less. 
     
     
         14 . The method of  claim 1  wherein the non dissolving grade pulp is blended with the dissolving grade pulp at a 20% by weight level or less. 
     
     
         15 . The method of  claim 1  wherein the non dissolving grade pulp is blended with the dissolving grade pulp at a 10% by weight level or less.