PAPERmaking! FROM THE PUBLISHERS OF PAPER TECHNOLOGY Volume 5, Number 2, 2019
option for replenishing the loss to environment but paper can be recycled maximum six to seven times and paper industry waste is very diverse in nature and composition. Various paper disposal methods like incineration, landfilling, pyrolysis and composting are available but their process optimization becomes a barrier. This review article aims at discussing in detail the use of paper and paper based packaging materials for food applications and painting a wide picture of various health and environmental issues related to the usage of paper and paper based packaging material in food industry. A brief comparison of the environmental aspects of paper production, recycling and its disposal options (incineration and land filling) had also been discussed. Pla-zno nanocomposite paper for antimicrobial packaging application, Journal Polimesin . 17 (2), pp.1-6. Many food packages (plastic wrappers) today cannot be broken down by the environment; therefore, it is necessary to add natural substances that can make the food package decompose and be resistant to contamination with bacteria. Development of biodegradable polymers from renewable sources is highly desirable for food preservation and packaging, provided they can be effective as plastics or paper that are currently used in packaging, protecting food against microbial contamination, physical damage and chemical reactions (eg oxidation). Poly lactic acid (PLA) is one of the natural polymers produced by several bacteria that grow in crops rich in carbohydrates (such as sugar beets, corn and others). This research aims to insert ZnO nanoparticles and chitosan into a plastic layer of PLA (poly lactic acid) which can improve the antibacterial properties of the resulting packaging. The method used in making PLA-ZnO-chitosan nanocomposite is the precipitation method and the heating method. PLA-ZnO nanocomposites were obtained by varying ZnO nanoparticles 0.5% by weight, 2% by weight, and 3.5% by weight. The results obtained in SEM images show that nanoparticles are homogeneously distributed on the plastic surface. Antimicrobial tests show nanocomposites work effectively in deactivating E. coli and S. aureus. where it was found that E. coli was more susceptible to this type of nanocomposite, where there was a reduction of 3.4 logs to 3.5% ZnO loading in the PLA layer. PAPERMAKING Highly Filled Papers, on their Manufacturing, Processing, and Applications, Benjamin Dermeik et al, Advanced Engineering Materials , 21 (6), 1900180. Since more than a decade ago, the research on highly filled papers, as well as paper Ǧ derived inorganic materials, has greatly intensified. As presented in this review, highly filled papers as preforms allow for the design of porous or dense, multilayered, and geometrically complex structures. These paper Ǧ derived ceramic Ǧ or metal Ǧ based materials are generated by the heat Ǧ treatment of highly filled papers. Paper Ǧ derived materials are potential materials of choice for applications in transportation, energy Ǧ generation, environmental conservation, support structures, medical uses, and electronic components. Due to the adjustability of the filler content and the good machinability of highly filled papers, paper Ǧ derived sheets or multilayers may include intricate structures and tailored gradients in phase structure or porosity. Paper Ǧ derived multilayers also may contain cast ceramic tapes or other functionalized layers, as presented in some examples. Computer Ǧ aided manufacturing processes for paper Ǧ derived materials can be supplemented by prediction models for the sintering shrinkage in order to identify optimal post Ǧ processing steps, stacking orders and orientations for highly filled paper layers within multilayer green bodies. The accuracy of established component Ǧ level sintering models can be significantly increased by microstructure models of the highly filled paper.
Technical Abstracts
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