Archive
ArchiveAbout TAPPI Journal
As of March 2022, TAPPI Journal’s (TJ) publishing model is 100% Open Access (OA) to improve the accessibility of its published articles, increase researcher engagement and make research more visible.这种新形式有助于研究人员满足他们的资金和拨款申请要求，并可能增加引文数量。与过去一样，版权归作者所有，与其他技术期刊不同的是，TJ不需要支付出版费用。Read more.
Editorial: A closer look at the 2021 TAPPI Journal Best Research Paper, TAPPI Journal July 2022
July 01, 2022
ABSTRACT: Each year, the TAPPI Journal Editorial Board honors the best of the journal’s content by nominating and voting for the TAPPI Journal Best Research Paper, which is ultimately selected based on scientific merit, innovation, creativity, and clarity.
Using bleaching stage models for benchmarking softwood ECF bleach plants, TAPPI Journal July 2022
July 01, 2022
摘要:本文采用稳态漂白、脱木质素和增白模型来评估无氯漂白剂(ECF)植物用二氧化氯漂白25-卡帕软木褐木的效果。病例1检查了磨机1的五阶段序列的D0(EOP)D1部分，使髓浆亮度达到86%的ISO。案例2研究了Mill 2四段序列中的D0(EO)D1部分，该部分使纸浆的亮度达到82%的ISO，案例3在对提取阶段进行改进数年后重新检查了同一漂白剂工厂。模型强调了在前面提到的案例中，漂白剂使用量高的天数，可能是由于棕色棕色和/或提取洗衣机的遗留量高，以及漂白剂使用量正常的天数。在案例2中，该模型估计，漂白过程中消耗的44公斤二氧化氯/公吨纸浆中，有10公斤可能与洗衣机遗留源发生反应;大约三分之二的额外消耗被认为是与萃取滤液反应。Mill 2所做的改变(案例3)将无效的二氧化氯使用量从10公斤/公吨纸浆减少到5公斤/公吨纸浆。当同时求解脱木质素和漂白模型时，模型预测的二氧化氯对D0和D1的优化分布与漂白植物的实际值存在一定差异。然而，当考虑到洗衣机结转源时，预测的二氧化氯总量与实际值一致。本研究表明，该漂白模型可作为软木ECF漂白植物的假设基准。
On the usage of online fiber measurements for predicting bleached eucalyptus kraft pulp tensile index — an industrial case, TAPPI Journal July 2022
July 01, 2022
ABSTRACT: Cellulose pulp’s physical-mechanical properties are determined by laboratory tests obtained from prepared handsheets. However, this procedure is time intensive and presents a lead time until the results are available, hindering its utilization for monitoring and decision-making in a pulp mill. In this context, developing real-time solutions for physical-mechanical properties prediction is fundamental. This work applied a mathematical modeling approach to develop a soft sensor for tensile index monitoring. The mathematical model considers online morphology measurements obtained from the last bleaching stage outlet stream and important process variables for tensile index prediction. The results obtained are satisfactory compared to laboratory results, presenting a mean absolute percentual error of 2.5%, which agrees with the laboratory testing method’s reproducibility.
Calender barring review with experiences, TAPPI Journal July 2022
July 01, 2022
ABSTRACT: Excessive calender vibration affects all styles of calender stacks from single to multi-nip, all hard rolls, or a combination of hard and soft rolls. Calender vibration can be forced vibration or self-excited vibration. Forced vibration occurs at the first few harmonics of the calender roll rotational speeds and is caused by imbalance, misalignment, eccentricity, etc. Self-excited vibration, the focus of this paper, occurs at higher frequencies. Feedback paths for self-excited vibration must be understood in order to ameliorate the problem. This is presented in the context of the historical development of the theory of self-excited feedback mechanisms, followed by a survey of self-excited feedback mechanisms in various types of calender stacks. Methodology to determine which feed-back path is present and techniques to control or eliminate the resulting vibration follow. To obtain a flavor of the types of problems faced and practical remedial actions, a variety of experiences with barring issues are provided.
Investigation of the Cellulose-Water Relationship by the Pressure Plate Method, TAPPI Journal July 2022
July 01, 2022
ABSTRACT: The swelling and water retention properties of pulp fibers are of basic importance in papermaking.
