PAPER making! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL Volume 6, Number 1, 2020
reviewed the peracetic acid pulp bleaching and its impact on pulp properties and presented the eco-friendly bleaching process for mixed hardwood. Paper Fillers Innovations: From Design of Particles to Preparing Filler Composites, Design and Fabrication of Paper Recycling Unit, Aditya Vinod Pillai et al, International Journal of Mechanical Engineering and Technology, Vol.11(2) . In any big institution, especially educational institutions like schools or colleges, generation of large quantity of waste papers is quite apparent. And effective use of recycled paper is also possible (craft papers, registers etc). So, instead of disposing off the waste papers into trash, recycling them makes sense. This not only helps the institute in cost saving but will also ensure its contribution towards the protection of the environment. Designing manually operated small-scaled paper recycling plant, which can be used in schools and colleges, ensures that a cheap and non-complex method of production of paper product is guaranteed. Accordingly design of the machine unit has been prepared with all necessary component specifications. Synthesis of chitosan composite microspheres and their application for the removal of stickies in the recycled paper, Yuekai Geng et al, Journal of Polymer Research Vol.27, Article No.97 . Stickies deriving from the recycled paper had multiple deleterious effects on the paper chemicals, machine run-nability and paper equality. The aim of this study was to synthesize citosan composite microspheres and remove stickies in the recycled paper by microspheres. Citosan-montmorillonite and chitosan-ferroferric oxide composite microspheres were prepared by emulsion cross-linking method. The surface morphology of microparticels was analyzed by Digital microscope (DM) and Scanning electron microscope (SEM). The removal effects of composite microspheres and talc on stickies were compared. It was found that CS-MMT microspheres had excellent thermal stability than chitosan microspheres and CS-Fe3O4 microspheres. The zeta potential of stock increased with the addition of talc,CS-MMT or CS-Fe3O4. Comparing with the plate talc, CS-MMT or CS-Fe3O4 microspheres adsorbed more easily the stickies and removed DCS in the recycled paper. Meanwhile, CS-MMT or CS-Fe3O4 had less negative impact on the strength of paper than talc. It contributed that there was a large number of hydroxyl groups on the surface of composite microspheres. CS-Fe3O4 had magnetic characteristics and the ability of removing Dissolved and Colloidal Substances (DCS) in white water were superior to CS-MMT. TESTING Quantitative aging assessment method for cellulose pressboard based on the interpretation of the dielectric response mechanism, Jiacheng Xie et al, Cellulose (2020), online . Cellulose pressboard is used as a key element in various power equipment insulation structures and determines the operational safety of electric equipment and power systems. This paper aims to increase the application of a pressboard aging assessment method based on frequency domain spectroscopy, a promising nondestructive method for power equipment diagnosis, through in-depth theoretical analysis and accurate data fitting. To achieve this purpose, first, based on classic theoretical models in the field of dielectric physics, a mathematical deduction is proposed to separate each dielectric process in the overlapping frequency band. Second, a novel analysis approach that considers both the pressboard dielectric response and the thermally stimulated current is proposed and demonstrated to be effective in determining the physical meaning of pressboard microscopic dielectric processes. Third, a function model based on a specific microscopic mechanism is established to fit the frequency domain spectra of pressboard samples with different aging degrees. Based on this
Technical Abstracts
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