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Journal articles
Open Access
Recovery of water and inorganic chemicals from kraft black liquor using membrane separation processes, TAPPI JOURNAL, January 1996, Vol. 79(1)

Recovery of water and inorganic chemicals from kraft black liquor using membrane separation processes, TAPPI JOURNAL, January 1996, Vol. 79(1)

Journal articles
Open Access
Batch-drainage curves for pulp characterization - Part 2: Modeling, TAPPI JOURNAL, January 1996, Vol. 79(1)

Batch-drainage curves for pulp characterization - part 2: modeling, TAPPI JOURNAL, January 1996, Vol. 79(1)

Journal articles
Open Access
Third year of record sales expected for U.S. paper and related industries in 1996, TAPPI JOURNAL, January 1996, Vol. 79(1)

Third year of record sales expected for u.s. paper and related industries in 1996, TAPPI JOURNAL, January 1996, Vol. 79(1)

Journal articles
Open Access
U.S. and Canadian CEOs mirror views of the forest products industry on a year of recovery, TAPPI JOURNAL, January 1996, Vol. 79(1)

CEO interview: paul e. gagne and avenor and monte haymon, s.d. warren, TAPPI JOURNAL, January 1996, Vol. 79(1)

Journal articles
Open Access
Customer needs are driving Canada's industry as never before, TAPPI JOURNAL, January 1996, Vol. 79(1)

Customer needs are driving canada's industry as never before, TAPPI JOURNAL, January 1996, Vol. 79(1)

Journal articles
Open Access
Training for continuous quality improvement, TAPPI JOURNAL, July 1996, Vol. 79(7)

Training for continuous quality improvement, TAPPI JOURNAL, July 1996, Vol. 79(7)

Journal articles
Open Access
Having a fit over your fluid connector fittings?, TAPPI JOURNAL, March 1996, Vol. 79(3)

Having a fit over your fluid connector fittings?, TAPPI JOURNAL, March 1996, Vol. 79(3)

Journal articles
Open Access
Effects of recycling on papermaking properties of mechanical and high yield pulps: part 1: hardwood pulps, TAPPI JOURNAL, March 1996, Vol. 79(3)

Effects of recycling on papermaking properties of mechanical and high yield pulps: part 1: hardwood pulps, TAPPI JOURNAL, March 1996, Vol. 79(3)

Journal articles
Open Access
Sampling error in measurement of dirt in pulp and paper, TAPPI JOURNAL, May 1996, Vol. 79(5)

Sampling error in measurement of dirt in pulp and paper, TAPPI JOURNAL, May 1996, Vol. 79(5)

Journal articles
Magazine articles
Open Access
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: œ The number of dirt specks larger than 250 µm in diameter increased as the ink coverage increased. œ 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. œ 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.

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