Mixing Bleached White Poplar and Wheat Straw Chemimechanical Pulps to Improve the Mechanical and Optical Characteristics
| Autor: | S Mahdavi, Afshin Veisi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Yield
Environmental Engineering Materials science lcsh:Biotechnology Bioengineering 02 engineering and technology 010501 environmental sciences engineering.material White poplar Raw material 01 natural sciences Optical and Mechanical properties chemistry.chemical_compound lcsh:TP248.13-248.65 CMP Composite material Hydrogen peroxide Waste Management and Disposal 0105 earth and related environmental sciences biology Pulp (paper) food and beverages Wheat straw Straw 021001 nanoscience & nanotechnology biology.organism_classification Pulp and paper industry chemistry visual_art Newsprint engineering visual_art.visual_art_medium Bleaching 0210 nano-technology |
| Zdroj: | BioResources, Vol 11, Iss 2, Pp 2987-2997 (2016) |
| ISSN: | 1930-2126 |
| Popis: | The aim of this study was to determine the optimum combination of wheat straw and white poplar (P. alba) chemimechanical pulps (CMPs) for producing newsprint paper. The CMP was prepared separately from the two raw materials. Cooking conditions included 10%, 12%, and 14% chemical charge based on w/w oven dry raw materials, maximum cooking temperatures of 120, 140, and 160 °C, and cooking time of 45 min. Hydrogen peroxide was used for bleaching the selected pulp. The results indicated that screened pulp yields were in the range of 54.3% to 61% and 80.9% to 85.9% for 18 cooking trials of wheat straw and white poplar, respectively. Handsheet brightness reached up to 52.9% and 61.9% for wheat straw and white poplar, respectively. The highest breaking length and burst index were related to CMP produced from 25% white poplar/75% wheat straw pulp blend. The best tear index was obtained using a mixture of 50% white poplar and 50% wheat straw pulp. Averages of breaking length, burst and tear indices ranged between 4.61 and 3.80 km, 2.31 and 2.55 kPa•m2/g, and 7.29 and 11.1 mN•m2/g, respectively. The strength properties of handsheets were higher than those reported for commercial newsprint except the breaking length of 50%/50% blend. |
| Databáze: | OpenAIRE |
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