PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 10, Number 2, 2024
NBHK, tissue paper) and moisture contents of up to 200%, there is a monotonic relationship between reflectivity and moisture content. This relationship is independent of the wood species used to make the paper, but does differ between wood-based papers and cotton-based papers. As this method involves an optical camera, the spatio-temporal distribution of moisture content in paper can be measured. The method was validated by separately measuring moisture content in paper gravimetrically for both uniform and non- uniform moisture distributions. The measurement technique was applied to a simulated pressing operation where the inferred moisture content distribution changes with the applied pressure. “Classification Analysis of Copy Papers Using Infrared Spectroscopy and Machine Learning Modeling”, Yong -Ju Lee, Tai-Ju Lee & Hyoung Jin Kim, BioResources , Vol.19(1), p160, (2024). The evaluation and classification of chemical properties in different copypaper products could significantly help address document forgery. This study analyzes the feasibility of utilizing infrared spectroscopy in conjunction with machine learning algorithms for classifying copy-paper products. A dataset comprising 140 infrared spectra of copy-paper samples was collected. The classification models employed in this study include partial least squares-discriminant analysis, support vector machine, and K- nearest neighbors. The key findings indicate that a classification model based on the use of attenuated-total-reflection infrared spectroscopy demonstrated good performance, highlighting its potential as a valuable tool in accurately classifying paper products and ensuring assisting in solving criminal cases involving document forgery. “Alternative methods to evaluate flocculation of particles in papermaking suspensions”, Juan Cecchini, Antti I. Koponen, Olli -Ville Laukkanen & Ari Jäsberg, Proceedings of TAPPICon 2024, April 28-May 1, 2024, Cleveland OH, USA. When dealing with papermaking fibre suspensions, particle aggregation takes place already before the paper web is formed. The particle aggregation depends on several aspects including particle mass concentration (consistency), particle collisions, electrochemical interactions promoted by chemical additives, etc. Due to its importance, fibre suspension aggregation (or flocculation) has been studied for a long time in papermaking, and several methods have been developed for this purpose. The traditional techniques include e.g. Focused Beam Reflectance Microscopy (FBRM) and High-Speed Video Imaging (HSVI). Recently, a new optical method, Optical Coherence Tomography (OCT) has emerged for flocculation and aggregation analysis. The advantages of OCT are the possibility to study opaque suspensions, its micron-level resolution and its high data acquisition speed. OCT measurements can be combined with rheological measurements, allowing simultaneous measurement of both the time evolution of the aggregate size and the suspension viscosity. In this work, we used this approach to study the flocculation of suspensions of various papermaking furnishes. We analyzed the time evolution of the aggregate size and the fibre suspension viscosity when the studied papermaking suspensions were treated with a Highly Refined Furnish (HRF, this furnish contains a significant amount of MFC type fibrils) together with chemical additives. We show how such studies can lead to a better understanding of the impact of flocculation on the produced paper web on such quantities as formation, drainage potential and strength behavior. TISSUE “Impact of Air Jet Impingement Technology on the Strength of Tissue Paper”, Reczulski, Mariusz; Pospiech, Piotr; Troszczyńska, Kinga & Bieńkowska, Maria, BioResources , 2024, Vol.19(1), p1190. Impinging air jets can be used to dewater, heat, and dry the web of tissue paper. High velocities of the air jets degrade the paper, and
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Technical Abstracts
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