Does kraft hardwood and softwood pulp viscosity correlate to paper properties?
| Autor: | Ricardo B. Santos, Ashok Ghosh, Humphrey J. Moynihan, Robert J. Oglesby, Peter W. Hart |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Materials science Softwood Mechanical Engineering General Chemical Engineering Pulp (paper) 02 engineering and technology General Chemistry engineering.material 021001 nanoscience & nanotechnology Pulp and paper industry 01 natural sciences stomatognathic diseases stomatognathic system 010608 biotechnology Media Technology Hardwood engineering General Materials Science 0210 nano-technology Kraft paper |
| Zdroj: | October 2016. 15:643-651 |
| ISSN: | 0734-1415 |
| Popis: | The impact of commercially prepared, fully bleached pulp viscosity variation on handsheet physical properties was evaluated at different levels of pulp refining. Hardwood pulps from the same brownstock species mix, cooking parameters, and kappa numbers were processed through two different commercial bleach plants: one with a D0(EP)D1D2 sequence and the second with an OD0(EOP)D1 sequence. Additionally, a commercial softwood (predominately Scotts pine) brownstock pulp bleached by an OD0(EP)D1D2 sequence was employed in this study. Pulps with viscosities ranging from 14 to 21 mPa∙s were refined in a Valley beater to two freeness levels, and the associated handsheet physical properties were measured in this study. Over the pulp viscosity range of 14 to 21 mPa∙s, no clear correlation was found to exist between pulp viscosity and related paper physical properties. Finally, a series of laboratory prepared bleached pulps were purposely prepared under non-ideal conditions to reduce their final viscosities to lower values. Handsheets made from these pulps were tested in their unbeaten condition for physical strength properties. Significant and rapid strength loss occurred when the measured pulp viscosity dropped below 12 mPa∙s; overall strength properties showed no correlation to viscosity above the critical 12 mPa∙s value. |
| Databáze: | OpenAIRE |
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