HOW TO PROPERLY MEASURE PROPERTIES OF HIGH-YIELD PULP IN THE LABORATORY
High-yield pulps (HYP) have been increasingly used in various paper grades due to their unique properties such as high bulk, high opacity, and good printability. Among the various properties of HYP, bulk is usually the most important quality for end users. However, it has been observed that there are often discrepancies among various laboratories in the measurement of HYP bulk and other properties. We have identified key factors affecting the measurement of HYP properties ranging from pulp preparation, handsheet making, and caliper measurement to the grammage basis used in the calculation of bulk. It was found that the measured freeness, bulk, and strength of HYP changes with the time delay between hot disintegration and freeness testing or handsheet making. HYP bulk and freeness increase during the first 4 hours after hot disintegration while the tensile strength decreases. Pre-soaking of HYP can minimize, but not eliminate, the change of bulk/freeness with time after hot disintegration. Speed drying with a fan decreases bulk but increases tensile strength compared to overnight drying. The number of handsheet plies in the caliper measurement also affects the bulk measurement.
HYP property measurements pre-soaking time delay
Zhirun Yuan Changbin Mao Wayne Bichard Michael Hellstern Daniel Gilbert Yajun Zhou Darren Guliov
FPInnovations,Pointe-Claire,QC,Canada 1FPInnovations,Pointe-Claire,QC,Canada Tembec,Temiscaming,QC,Canada Canfor Taylor Pulp, Taylor, BC, Canada
国际会议
International Mechanical Pulping Conference 2011(2011国际机械浆学术会议)
西安
英文
68-74
2011-06-26（万方平台首次上网日期，不代表论文的发表时间）