PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 9, Number 3, 2023
COATING Tung oil-based coatings towards sustainable paper packaging materials, F.M. Silva, R.J.B. Pinto, A.M. Barros-Timmons & C.S.R. Freire, Progress in Organic Coatings , VOL.178, May 2023, 107476. Nowadays, the dependence on synthetic plastic-based materials for the preservation and transport of different types of products is very high, leading to major environmental and human health concerns, which highlights the importance of investigating sustainable options. Paper is a widely used bio-based material for packaging however, the development of newer and straightforward approaches to produce paper-based materials with increased functionalities and performance is still highly desired. In this work, we report the use of a bio-based photopolymerizable coating formulation, composed of tung oil, and using Darocur 1173 as photoinitiator, to develop functional papers with hydrophobic and improved water barrier properties, without compromising other properties. Coated paper samples were prepared, using different irradiation times (0, 15, 30, 60, and 300 s), to study the effect of this parameter on the properties of the coated papers. The ensuing coated papers presented pick-up values between 6 and 7 g/m 2 . Their hydrophobicity was significantly improved as evidenced by the increase in the contact angle values from about 71° to 127° and the significant decrease in the water absorption, measured by the Cobb test, from 108 down to 17 g/m 2 , upon a curing time of only 15 s. Furthermore, with this time of curing, the optical (viz. whiteness, brightness, and opacity) and mechanical properties (viz. tensile and burst strength) of paper were not affected. These results highlight the great potential of tung oil photopolymerizable coating formulations as a simple and promising alternative for the fabrication of more sustainable and functional paper packaging materials. ENERGY Thermodynamic analysis of a cogeneration system in pulp and paper industry under singular and hybrid operating modes, Ramadan Hefny Ali, Ahmed A. Abdel Samee & Hussein M. Maghrabie, Energy , Vol. 263, Part E, 15 January 2023, 125964. In the present study, a thermodynamic analysis of a cogeneration system in a pulp and paper industry under different operating modes i.e., singular and hybrid with a variable ambient temperature is conducted according to actual operating data. For singular operating mode, the power boiler is only employed using natural gas while for hybrid operating mode, the power boiler with the recovery boiler is employed using natural gas and black liquor as main fuels, respectively. The results show that for hybrid operating mode in comparison with the singular one, the thermal efficiency of turbine and condenser is enhanced by 1.36 and 7.7%, respectively while it is reduced by 2.8% for the power boiler. In addition, the overall thermal efficiency under singular and hybrid operating modes is 87.4 and 53.7%, respectively. For hybrid operating mode, the exergy destruction of power boiler decreases by almost 10% compared with that for the singular operating mode. Also, at hybrid operating mode, the soda is recovered with a mass flow rate of 33 tons/hour that is required for the cooking process in the chemical pulp section and additionally the consumption of natural gas in the power boiler is reduced by 11.8%. FILLERS Use of waste chicken eggshells as an alternative calcium carbonate source for filler purposes in the paper industry , Gerald Akankunda, Makerere University, Uganda, Undergraduate dissertation. Chicken eggshells, a common waste, are hard, brittle and in abundance. Their abundance has led to their poor disposal. These shells were collected, cleaned and part of them bleached, ground into a powder and the powder analyzed for its suitability as a filler in the paper industry. In the paper industry, fillers are used to reduce on the amount of fiber required in the paper manufacture. Commonly used fillers are
Technical Abstracts
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