Some properties of newsprint impregnated with polyvinylamine.Application: This paper asses some of the performance characteristics of a newly available surface-strengthening polymer for newsprint newsprint low grade paper used for newspapers. Old newspapers are fed to cattle as an alternative roughage and may occasionally be ingested by dogs. Significant amounts of lead are accumulated in tissues; no cases of poisoning have been recorded in cattle, though it has been . Mechanical pulp is a relatively inexpensive and environmentally friendly Environmentally friendly, also referred to as nature friendly, is a term used to refer to goods and services considered to inflict minimal harm on the environment.[1] source of papermaking pa·per·mak·ing n. The process or craft of making paper. pa  per·mak fibers, but its use in high-performance printing papers is limited by problems with brightness, color, light sensitivity, and printing characteristics. For both the yellowing and the brightness problems, there are commercially available solutions, but the problems of printing characteristics are yet to be overcome. Printing involves exposing the sheet to moisture, which can damage the surface. In this work, we considered the potential of polyvinylamine for strengthening the surfaces of newsprint and related paper grades. We chose to treat sheets that were entirely impregnated im·preg·nate tr.v. im·preg·nat·ed, im·preg·nat·ing, im·preg·nates 1. To make pregnant; inseminate. 2. To fertilize (an ovum, for example). 3. with polyvinylamine instead of coating only the surface out of convenience. We found that polyvinylamine does indeed strengthen wet and dry newsprint. Wet strength did not decrease with soaking time, indicating a permanent character to the improvement. Drying impregnated sheets both at room temperature and at 120[degrees]C gave similar strength improvements. Pelton and Hong are with McMaster Centre for Pulp and Paper Research, Dept. of Chemical Engineering, JHE-136, McMaster University McMaster University, at Hamilton, Ont., Canada; nondenominational; founded 1887. It has faculties of humanities, science, social sciences, business, engineering, and health sciences, as well as a school of graduate studies and a divinity college. , Hamilton, Ontario, CAN L8S 4L7. Email Pelton at peltonrh@mcmaster.ca |
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