Effects of Sugar Addition Before Drying on the Wet-Flexibility of Redispersed Kraft Fibers

Paper made from recycled, chemically pulped fibers typically has lower strength than paper made from virgin fibers. This was confirmed with respect to tensile and compression strength for an unbleached softwood kraft pulp. It was also confirmed that the addition of sucrose, at high concentration, to virgin pulp before drying could improve the recycled paper strength, compared to a control with no sugar added. The use of glucose was found to be slightly more effective than sucrose. Fibers treated with the sugars were found to have higher flexibility and water retention values than untreated fibers that had been subjected to the same drying conditions.

[1]  李幼升,et al.  Ph , 1989 .

[2]  R. Atalla,et al.  Some Effects of Elevated Temperatures on the Structure of Cellulose and its Transformation , 1984 .

[3]  A. M. Scallan,et al.  Swelling and elasticity of the cell walls of pulp fibres , 1992 .

[4]  Min Zhang,et al.  EFFECT OF CHEMICAL PRETREATMENTS OF NEVER-DRIED PULP ON THE STRENGTH OF RECYCLED LINERBOARD , 2001 .

[5]  J. A. Olson,et al.  A dynamic wet fibre flexibility measurement device , 1995 .

[6]  R. L. Ellis,et al.  Recycled vs. virgin fiber characteristics : a comparison , 1993 .

[7]  T. Maloney,et al.  Intra- and inter-fibre pore closure in wet pressing , 1997 .

[8]  W. Bichard,et al.  The basic effect of recycling on pulp properties , 1992 .

[9]  B. Alince.  Porosity of swollen pulp fibers revisited , 2002 .

[10]  W. Campbell.  Hydration and Beating of Cellulose Pulps , 1934 .

[11]  J. E. Stone,et al.  Effect of component removal upon the porous structure of the cell wall of wood , 1965 .

[12]  M. Hubbe,et al.  Changes to Unbleached Kraft Fibers Due to Drying and Recycling , 2003 .

[13]  P. Iyer,et al.  Induced crystallization of cellulose in never‐dried cotton fibers , 1991 .

[14]  A. Mckenzie,et al.  The structure and properties of paper. XIV. Effects of drying on cellulose fibres and the problem of maintaining pulp strength , 1963 .

[15]  L. Salmén,et al.  Effects of mechanical and chemical treatments on the pore-size distribution in wood pulps examined by inverse size-exclusion chromatography , 1997 .

[16]  Min Zhang,et al.  Can recycled kraft fibres benefit from chemical addition before they are first dried , 2002 .

[17]  A. M. Scallan,et al.  The influence of drying and beating on the swelling of fines , 1996 .

[18]  N. Gurnagul,et al.  Fibre-fibre bond strength of once-dried pulps , 2001 .

[19]  E. Gruber,et al.  Chemical modification of pulp to reduce its hornification tendency , 1998 .

[20]  Mousa M. Nazhad,et al.  Fundamentals of strength loss in recycled paper , 1994 .

[21]  J. E. Stone,et al.  The effect of component removal upon the porous structure of the cell wall of wood. Part III. A comparison between the sulphite and kraft processes , 1968 .

[22]  U. Weise.  Hornification : mechanisms and terminology , 1998 .