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In the current study, the effects pertaining to the addition of bulking agent on the density and the surface free energy of the paper-sheets were evaluated. Bulking agent addition resulted in the reduction of the density of wheat straw pulp paper (WBKP). The tensile strength of the handsheets varied in proportion to the reduction of sheet density. Basically, the decrease in tensile strength of the handsheets was dependent on the decrease in inter-fiber bonding strength, which follows the Page equation theory. The bulking promoter S enhanced the sheet sizing performance by its addition, and it improved the sizing performance further when used in combination with AKD sizing agent. Wetting characteristics of the handsheets were determined by contact angle measurements. The addition of bulking agent S reduced the γs , which reduced the hydrophilicity of the paper. In addition, the use of the bulking agent in combination with AKD sizing agent resulted in the reduction of the paper γs . (Received 16 July, 2016; Accepted 5 September, 2016) # corresponding author: E-mail: nefujinhailan@163.com 麦わらパルプシートの低密度化特性および 表面自由エネルギーの変化

Effects of Internal Addition of Bulking Promoter on Low-Density and Characteristics of Surface Free Energy of Wheat Straw Pulp Handsheet