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Application of ATR-IR measurements to predict the deinking efficiency of UV-cured inks, TAPPI Journal January 2022
ABSTRACT: In recent years, ultraviolet (UV)-curable ink has been developed and widely used in various printing applications. However, using UV-printed products (UV prints) in recovered paper recycling causes end-product dirt specks and quality issues. A new method was developed that can distinguish UV prints from other prints by means of attenuated total reflectance infrared (ATR-IR) spectroscopy. Application of this method could allow more efficient use of UV prints as raw materials for paper recycling.First, a mill trial was performed using UV prints alone as raw materials in a deinked pulp (DIP) process. Second, test prints were made with four types of UV inks: a conventional UV ink and three different highly-sensitive UV inks. Each print sample had four levels of four-color ink coverage patterns (100%, 75%, 50%, and 25%). Next, deinkability of all prints was evaluated by laboratory experiments. Finally, each print was measured using the ATR-IR method, and the relationship between the IR spectra and deinkability was investigated. Mill trial results showed that UV prints caused more than 20 times as many dirt specks as those printed with conventional oil-based ink. There were variations in recycling performance among UV prints taken from bales used for the mill trial. Lab tests clearly revealed that not all UV-printed products lead to dirt specks. In order to clarify the factors that affected deinkability of UV prints, the print samples were investigated by lab experiments. Key findings from lab experiments include: • The number of dirt specks larger than 250 µm in diameter increased as the ink coverage increased. • Higher ink coverage area showed stronger intensity of ATR-IR spectral bands associated with inks. These results indicate that deinkability of UV prints could be predicted by analysis of ATR-IR spectra. • Finally, the method was applied for assessment of recovered paper from commercial printing presses. It was confirmed that this method made it possible to distinguish easily deinkable UV prints from other UV prints. Based on these findings, we concluded that the ATR-IR method is applicable for inspection of incoming recovered paper.
Journal articles
Magazine articles
Technological evaluation of Pinus maximinoi wood for industrial use in kraft pulp production, TAPPI Journal August 2021
ABSTRACT: This study characterized Pinus maximinoi wood and evaluated its performance for pulp production. Samples of Pinus taeda wood were used as reference material. For both species, wood chips from 14-year-old trees were used for the technological characterization, pulping, bleaching process analysis, and pulp properties. A modified kraft pulping process was carried out targeting kappa number 28±5% on brownstock pulp. The bleaching sequence was applied for bleached pulp with final brightness of 87±1 % ISO. Refinability and resistance properties were measured in the bleached pulps. Compared to P. taeda wood, P. maximinoi showed slightly higher basic density (0.399 g/cm³) and higher holocellulose (64.5%), lignin (31.1%), and extractives content (4.5%), along with lower ash content (0.16%). P. maximinoi tracheids showed greater wall thickness (6.4 µm) when compared to P. taeda tracheids. For the same kappa number, P. maximinoi and P. taeda resulted in similar screened yield, with an advantage observed for P. maximinoi, which resulted in lower specific wood consumption (5.281 m³/o.d. metric ton), and lower black liquor solids (1.613 metric tons/o.d. metric ton). After oxygen delignification, P. maximinoi pulp showed higher efficiency on kappa reduction (67.2%) and similar bleaching chemical demand as P. taeda pulp. Compared to P. taeda pulps, the refined P. maximinoi pulps had similar results and the bulk property was 10% higher. Results showed that P. maximinoi is an interesting alternative raw material for softwood pulp production in Brazil.
The Economics of Direct Steam Injection, 2005 Engineering, Pulping & Environmental Conference
The Economics of Direct Steam Injection, 2005 Engineering, Pulping & Environmental Conference
Energy Reduction at a Kraft Mill: Examining the Effects of Process Integration, Benchmarking, and Water Reduction, 2004 Engineering, Pulping, and PCE&I Conference
Energy Reduction at a Kraft Mill: Examining the Effects of Process Integration, Benchmarking, and Water Reduction, 2004 Engineering, Pulping, and PCE&I Conference
Application of Selected Microbial Formulations for Enhancing BOD Removal and Residence Time Studies, 1992 Environmental Conference Proceedings
Application of Selected Microbial Formulations for Enhancing BOD Removal and Residence Time Studies, 1992 Environmental Conference Proceedings
Analysis of the Potential of Photochemical and Electrochemical Techniques for Decolorization of Bleached Kraft Mill Effluent, 1992 Environmental Conference Proceedings
Analysis of the Potential of Photochemical and Electrochemical Techniques for Decolorization of Bleached Kraft Mill Effluent, 1992 Environmental Conference Proceedings
New Test Method for the Characterization of Paper/ Melamine/ Reactivity, 1996 Plastic Laminates Symposium Proceedings
New Test Method for the Characterization of Paper/ Melamine/ Reactivity, 1996 Plastic Laminates Symposium Proceedings
Using Optimization Tools to Improve Mill Performance, 1993 P
Using Optimization Tools to Improve Mill Performance, 1993 Process Control, Electrical & Information Conference Proceedings
Application of 600 Volt Soft Start Motor Controllers, 1996 P
Application of 600 Volt Soft Start Motor Controllers, 1996 Process Control, Electrical & Info. Conference Proceedings
New Mini/Urban Total System - Harmony with Primary and Secondary Fibre and Paper Producers, 1994 Recycling Symposium Proceedings
New Mini/Urban Total System - Harmony with Primary and Secondary Fibre and Paper Producers, 1994 Recycling Symposium Proceedings