PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 9, Number 1, 2023
“ Preparation of in-situ modified diatomite and its application in papermaking ”, Zhitian Fan et al, Colloids and Surfaces A: Physicochemical and Engineering Aspects , Vol.657 Part A, 2023. In the paper industry, adding fillers can replace plant fibers in pulp, which is beneficial to environmental protection and cost reduction. However, the large-scale use of inorganic fillers can interfere with interfiber bonding, thereby affecting the physical properties of paper. Due to the loss of fillers and paper fibers, the pollution of paper machine white water is aggravated. In order to improve the above situation, diatomite was used as the matrix and modified by Al(OH) 3 in-situ precipitation. In this study, modified diatomite was used as a papermaking filler. Paper properties, retention and the chemical oxygen demand in papermaking wastewater were also evaluated. The results show that, compared with the blank control, the modified diatomite filler could effectively improve the retention rate and reduce the pollution of paper machine white water while maintaining the physical strength of the paper. Among them, the fiber retention rate of pulp raw material could reach 98.05% and the chemical oxygen demand content of paper machine white water was 30.10 mg L −1 . NANO-SCIENCE "Enhancing strength properties of recycled paper with TEMPO-oxidized nanocellulose", E. Indarti et al, BioResources 18(1), 2023. Recycled fibers used in the manufacturing of paper and board are associated with strength deficiencies. This study investigated the use of TEMPO-oxidized nanocellulose from oil palm empty fruit bunch (OPEFB-TEMPO) for reinforcing papers made from such fibers. Strength properties of tensile and tear were enhanced with the addition of OPEFB-TEMPO, with strong correlations, as indicated by the R 2 values. The reinforcement capability was supported by the scattering coefficient- percent relationship. The only drawback of the nanocellulose addition is that it reduces pulp drainability, which can be minimized by adding drainage aids. Because only a relatively small amount is required, OPEFB-TEMPO has the potential to be used as paper strengthening agent, particularly in the production of low grammage papers. PACKAGING TECHNOLOGY “ Lavender Essential Oil as Antibacterial Treatment for Packaging Paper ”, Dimitrina Todorova et al, Coatings , Vol.13(1), 2023. Based on many years of experience, packaging is considered as an inactive barrier that protects materials and goods from environmental factors. The applicability of native chemical additive such as essential oils in wrapping papers can be used in the forms of films, treatments, coatings or others. Essential oils or extracts from different aromatic plants are used as bioactive substances for antimicrobial activity. In this research, lavender essential oil treatment of packaging papers is examined for its inhibition activity under nine microorganisms — two Gram-positive bacteria, three Gram-negative bacteria, two yeast and two fungal strains. The effectiveness of the treatment on the structural and strength indicators of the obtained paper samples is monitored. In detail, a five-day examination is conducted on the antibacterial effectiveness of lavender essential oil treatment. Results indicate that the lavender treatment of the obtained packaging paper is successful and the antifungal effect is more pronounced. The antimicrobial efficiency of paper treated with lavender essential oil is between 60 and 90% in the first two hours after treatment and gradually decreases to 40% – 50% at the end of the 120 h period. The lavender essential oil treatment of wrapping paper has a promising perspective for preserving products from microbial spoilage and extending their shelf life. “Research State of Disposable Non - plastic Straws”, Zhang Yuting et al, Paper & Biomaterials , No.4, 2022. The continuous production of disposable plastic straw places a high demand on global petrochemical resources and a significant environmental burden.
Technical Abstracts
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