PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 4, Number 2, 2018
PULPING A new approach to improve dissolving pulp properties: spraying cellulase on rewetted pulp at a high fiber consistency, Jianguo Li et al, Cellulose , Vol.25 (12). Cellulase treatment is a promising technology that will increase the reactivity of a prehydrolysis kraft (PHK) dissolving pulp. In this study, a cellulase solution was sprayed onto rewetted pulp at a very high consistency (about 60%) to increase its Fock reactivity with high efficiency and low cost. This novel and facile approach is based on favourable cellulose adsorption onto pulp fibres and high cellulose concentration at the reaction sites. Consequently, the enzymatic reactions towards cellulose fibres are more effective, thus a higher enzymatic performance in comparison with the conventional process. Herein, the proposed cellulase spraying technology is flexible and readily implementable in practice. TESTING Improved method for measuring moisture content of mineral-oil-impregnated cellulose pressboard based on dielectric response, M. Zhang et al, Cellulose , Vol.25 (10). The moisture content in transformer insulation pressboards is an important index to evaluate the insulation aging in the transformer. The dielectric-response technique based on frequency domain spectroscopy is used to accurately measure the moisture content in transformer insulation pressboard. In this study, according to the distribution of water molecules in oil-impregnated cellulose pressboard and the polarization behaviour of water molecules at different frequencies, a theoretical calculation method for moisture content in a composite model of cellulose pressboard, mineral oil, and moisture based on a typical transformer structure is proposed. Experimental investigation on bending fatigue failure of corrugated paperboard, Zhi Ǧ Wei Wang & Yu Ǧ Cheng Sun, Packaging Technology and Science , Vol.31 (9). A series of 3 Ǧ point bending fatigue tests were conducted to investigate the bending fatigue behaviour of flute type B and C corrugated paperboard samples under cyclic loading. The results obtained in this paper may be applied to the dynamic design and accelerated vibration test of stacked corrugated boxes. Study on the method for testing the water vapor diffusion resistance of membranes, Wei Li & Ye Yao, Polymer Testing , Vol.69. Water vapour diffusion resistance is an important property of porous membranes. In the paper, a new apparatus for specially measuring the water vapour diffusion resistance of porous membranes was developed. In the new apparatus, the humidity of circulating carrier air streams flowing over both sides of test membrane are controlled by different saturated salt solutions, which makes a variety of humidity conditions and improves the humidity stability. In order to decrease the error caused by the air boundary layer, the structure of the test chamber was optimized with the help of computational fluid dynamics technology. The new apparatus is a simple, low-cost and time-saving alternative for measuring the water vapour diffusion resistance of porous membranes. WASTE TREATMENT Effective lactic acid production from waste paper using Streptococcus thermophilus at low enzyme loading assisted by Gleditsia saponin, Shujuan Yang et al, Carbohydrate Polymers , Vol.200. Waste paper has considerable potential as a raw material for lactic acid (LA) production due to high cellulose content, abundance and low cost. In this study, four kinds of waste papers were used for LA production through simultaneous saccharification and fermentation (SSF) by Streptococcus thermophilus .
Technical Abstracts
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