Impregnation of Paper Sheets in Vinyl Acetate/Vinyl Chloride Copolymer Solution
| Main Authors: | , |
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| Format: | Article |
| Language: | English Slovak |
| Online Access: | http://www.viks.sk/chk/journalelapla.doc |
| Abstract: | SUMMARIES. Bleached wood pulp paper sheets were impregnated in a solution of metoylene chloride containing different concentrations of vinyl acetate/vinyl chloride copolymer (2-6 gm/100 ml) for different time intervals (5-60 seconds). The effects of polymer concentration and dipping time on the retained polymer on paper sheets were determined. The effects of heating (softening) treated paper sheets at different temperatures [(100,110, and 120°C) for five minutes and at 110°C for different time intervals (3-15 minutes)] on the physical properties of paper sheets were also investigated. The physical properties of the impregnated paper sheets were highly improved. Breaking length increased from 2.2 to 5.4 km, burst factor increased from 12 to 38, tear factor increased from 64 to 105, and water absorbance decreased from 175 to 46. Softening temperature, heating time, and retained polymer play an important role in the improvement of the physical properties of paper sheets. CONCLUSION. It has been shown that thsre is an optimum dipping time, softening temperature, and softening time for the processing of paper sheets impregnated with vinyl acetate/vinyl chloride copolymer. When using paper sheets with 12.5 g/m2 of retained polymer, softening them at 110°C for approximately six minutes produced sheets with the best breaking length, burst factor, tear factor, and water absorption. By controlling the amount of retained polymer on the paper sheets, the physical properties of the paper sheets could also be controlled. Polymer retention up to 12.5 g/m2 produced paper sheets with increasingly better properties after which either constant conditions or a decrease in properties was observed. |
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| ISSN: | 0095-2443 |