Paper360 - January/February 2010 - (Page 30)

Inside this month’s TJ Summaries The papers summarized here are currently in review and slated for publication in TAPPI JOURNAL during 2010. TJ is an online publication of relevant and timely peer-reviewed research that is delivered via email free to all TAPPI members. To receive TAPPI JOURNAL, join TAPPI at ALTERNATIVE FIBERS Study of the chemical modification process of jute fiber By Wei-ming Wang, Zai-sheng Cai, and Jian-yong Yu Jute is a natural biodegradable fiber with advantages such as high tensile strength, excellent thermal conductivity, coolness, and ventilation function. However, the degumming process is necessary for improving jute fiber’s textile properties. This paper studies degumming of pre-chlorite treated jute fiber. Findings show that sodium hydroxide concentration, sodium silicate concentration and treatment time were the three most important parameters for degumming. BLACK LIQUOR BOILERS Evaporation of Na2CO3-Na2SO4 solutions: A method to evaluate the distribution between bulk and surface crystallization By Mathias Gourdon, Lars Olausson and Lennart Vamling Precipitation of sodium salts in black liquor evaporators causes problems by forming scales on the evaporator surface, reducing heat transfer and cleaning intervals. Most problems are connected with the crystallization of sodium carbonate and sodium sulfate. If crystals form and remain on the surfaces, a layer of scales will build up with time. This work develops a method for estimating the distribution of crystal masses between the bulk and on surfaces. Experiments reveal that the method gives valuable information on the crystallization process. This model can be a useful tool for resolving scale problems in black liquor evaporators. PCC FILLERS Papermaking potential of novel nanostructured PCC fillers By Kimmo Koivunen and Hannu Paulapuro New material solutions and paper engineering are needed to meet the needs for improvement of both brightness and opacity of paper. Only recently has more attention been paid to increasing the refractive indices of papermaking materials, especially fillers and pigments. A recently developed nanostructured PCC offers a more effective refractive index and an advantageous structure for light scattering. In this study, researchers fabricated filler-grade calcium carbonates with a low degree of nanostructuring to obtain an indication on their paper technical potential. The results suggest advantageous optical properties and combinations of optical and strength properties of paper. Paper360º January/February 2010

Table of Contents for the Digital Edition of Paper360 - January/February 2010

Paper360 - January/February 2010
Over the Wire
Outlook: North America 2010
Confronting the Carbon Challenge
Improve Your Energy Efficiency
Feature: Paper Machine Clothing
Around the Industry
Association News
Improving Print Performance
Tracking Tension
Dateline: London
Index of Advertisers

Paper360 - January/February 2010