PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL Volume 6, Number 1, 2020
COATING Water and Oil Resistance Improvement of Paper Coated with Aqueous Mixture of Hydrophilic and Hydrophobic Cross-Linked Copolymers, Zhaoping Song et al, BioResources, Vol.15(2) . An aqueous mixture of hydrophilic and hydrophobic cross- linked copolymers was prepared and coated on the surface of filter paper to improve the water and oil resistances. The mixture was mainly composed of sodium alginate and hydroxyl-terminated polydimethylsiloxane (PDMS)-tetramethoxysilane (TMOS) cross- linked network. The results indicated that the resistances to both water and oil of the resulting paper were significantly enhanced. The water contact angle results demonstrated that the mixture enhanced the hydrophobic properties of the coated paper greatly with water contact angles higher than 110°, and the coated paper showed excellent oil resistance with a Kit number as high as 10. Effect of Recycled Polystyrene/Limonene Coating on the Mechanical Properties of Kraft Paper: A Comparative Study with Commercial Coatings, M. Jimenez-Francisco et al, Journal of Polymers and the Environment (2020), online. In this work, the mechanical properties of Kraft paper (KP) coated with a coating formulated with recycled polystyrene dissolved in the solvent lime limonene (rEPS/LL) are investigated. These mechanical properties are compared with those of KP coated with three different commercial coatings: oil-based alkyd coating (ALKY), oil-based phenolic coating (PHEN) and water-based acrylic coating (ACRY). The morphology characterization via scanning electron microscopy showed the KP coated with rEPS/LL resembles a layered structure, in which, part of the coating remained on the surface and part of the coating was absorbed by the KP. The KP coated with rEPS/LL exhibited the highest tensile stiffness and compression strength when compared to the uncoated KP and KP coated with commercial coatings. The remarkable compression properties of the KP coated with rEPS/LL coating may be explained by the bending and crushing mechanisms observed during the ring crush test. The excellent mechanical performance of rEPS/LL combined with an environmentally friendly process to obtain recycled EPS using a bio-based solvent presents several advantages for coating applications. These results warrant further research to fully understand the properties of KP coated with rEPS/LL. ENERGY / ENVIRONMENT Cost Ǧ Saving Opportunities in the Energy Management of Papermaking Processes, Ján Janošovský et al, Chemical Engineering & Technology (2020), online . Energy consumption optimization belongs to the main agendas in sustainable industries. Here, cost Ǧ saving opportunities in the pulp and paper industry as one of the largest industrial energy consumers worldwide are in the focus. Energy Ǧ saving measures are proposed employing a large Ǧ scale mathematical model of a paper machine based on mass and energy balances supported by real Ǧ time experiments in paper machine operation. The presented measures are based on the optimization of paper stock pumping and a drying section operation. The total energy Ǧ saving effect of the four proposed measures accounted for a reduction in specific heat and electricity consumption by more than 2 %. The proposed procedures require no or low investment costs with the overall simple rate of return of less than one year. Life cycle cost assessment of recycled paper manufacture in China, Jigeng Li et al, Journal of Cleaner Production, Vol.252 . Recovered paper is one of the major raw material for recycled papermaking industry. In China, the domestic recovered paper recycling system is incomplete and the amount of recyclable recovered paper cannot satisfy the papermaking demand. Therefore, the recycled papermaking industry is
Technical Abstracts
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