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Recycled Paper Operations

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The use of waste or recycled paper as the raw material for pulp production has increased during the last several decades, and some paper plants depend almost completely on waste paper. In some countries, waste paper is separated from other household waste at the source before it is collected. In other countries separation by grade (e.g., corrugated board, newsprint, high-grade paper, mixed) takes place in special recycling plants.

Recycled paper can be repulped in a relatively mild process which uses water and sometimes NaOH. Small metal pieces and plastics may be separated during and/or after repulping, using a debris rope, cyclones or centrifugation. Filling agents, glues and resins are removed in a cleaning stage by blowing air through the pulp slurry, sometimes with the addition of flocculating agents. The foam contains the unwanted chemicals and is removed. The pulp can be de-inked using a series of washing steps which may or may not include the use of chemicals (i.e., surfactant fatty acid derivatives) to dissolve remaining impurities, and bleaching agents to whiten the pulp. Bleaching has the disadvantage that it may reduce fibre length and therefore lessen final paper quality. The bleaching chemicals used in recycled pulp production are usually similar to those used in brightening operations for mechanical pulps. After the repulping and de-inking operations, sheet production follows in a manner very similar to that using virgin fibre pulp.

 

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Contents

Paper and Pulp Industry References

Canadian Pulp and Paper Association. 1995. Reference Tables 1995. Montreal, PQ: CPPA.

Food and Agriculture Organization (FAO) of the United Nations. 1995. Pulp and Paper Capacities, Survey 1994-1999. Rome: FAO.

Henneberger, PK, JR Ferris, and RR Monson. 1989. Mortality among pulp and paper workers in Berlin. Br J Ind Med 46:658-664.

International Agency on the Research of Cancer (IARC). 1980. Monographs on the Evaluation of Carcinogenic Risks to Humans: Wood, Leather and Some Associated Industries. Vol. 25. Lyon: IARC.

—.1987. Monographs on the Evaluation of Carcinogenic Risks to Humans, Overall Evaluations of Carcinogenicity: An Updating of IARC Monographs. Vol. 1-42 (supplement 7). Lyon: IARC.

—.1995. Monographs on the Evaluation of Carcinogenic Risks to Humans: Wood Dust and Formaldehyde. Vol. 62. Lyon: IARC.

International Labour Organization (ILO). 1992. Social and Labour Issues in the Pulp and Paper Industry. Geneva: ILO.

Jäppinen, P. 1987. Exposure to Compounds, Cancer Incidence and Mortality in the Finnish Pulp and Paper Industry. Thesis, Helsingfors, Finland.

Jäppinen, P and S Tola. 1990. Cardiovascular mortality among pulp mill workers. Br J Ind Med 47:259-261.

Jäppinen, P, T Hakulinen, E Pukkala, S Tola, and K Kurppa. 1987. Cancer incidence of workers in the Finnish pulp and paper industry. Scand J Work Environ Health 13:197-202.

Johnson, CC, JF Annegers, RF Frankowski, MR Spitz, and PA Buffler. 1987. Childhood nervous system tumors—An evaluation of the association with paternal occupational exposure to hydrocarbons. Am J Epidemiol 126:605-613.

Kuijten, R, GR Bunin, and CC Nass. 1992. Parental occupation and childhood astrocytoma: Results of a case-control study. Cancer Res 52:782-786.

Kwa, SL and IJ Fine. 1980. The association between parental occupation and childhood malignancy. J Occup Med 22:792-794.

Malker, HSR, JK McLaughlin, BK Malker, NJ Stone, JA Weiner, JLE Ericsson, and WJ Blot. 1985. Occupational risks for pleural mesothelioma in Sweden, 1961-1979. J Natl Cancer Inst 74:61-66.

—. 1986. Biliary tract cancer and occupation in Sweden. Br J Ind Med 43:257-262.

Milham, SJ. 1976. Neoplasias in the wood and pulp industry. Ann NY Acad Sci 271:294-300.

Milham, SJ and P Demers. 1984. Mortality among pulp and paper workers. J Occup Med 26:844-846.

Milham, SJ and J Hesser. 1967. Hodgkin’s disease in woodworkers. Lancet 2:136-137.

Nasca, P, MS Baptiste, PA MacCubbin, BB Metzger, K Carton, P Greenwald, and VW Armbrustmacher. 1988. An epidemiologic case-control study of central nervous system tumors in children and parental occupational exposures. Am J Epidemiol 128:1256-1265.

Persson, B, M Fredriksson, K Olsen, B Boeryd, and O Axelson. 1993. Some occupational exposures as risk factors for malignant melanomas. Cancer 72:1773-1778.

Pickle, L and M Gottlieb. 1980. Pancreatic cancer mortality in Louisiana. Am J Public Health 70:256-259.
Pulp and Paper International (PPI). 1995. Vol. 37. Brussels: Miller Freeman.

Robinson, C, J Waxweiller, and D Fowler. 1986. Mortality among production workers in pulp and paper mills. Scand J Work Environ Health 12:552-560.


Schwartz, B. 1988. A proportionate mortality ratio analysis of pulp and paper mill workers in New Hampshire. Br J Ind Med 45:234-238.

Siemiatycki, J, L Richardson, M Gérin, M Goldberg, R Dewar, M Désy, S Campell, and S Wacholder. 1986. Association between several sites of cancer and nine organic dusts: Results from an hypothesis-generating case control study in Montreal, 1979-1983. Am J Epidemiol 123:235-249.

Skalpe, IO. 1964. Long-term effects of sulfur dioxide exposure in pulp mills. Br J Ind Med 21:69-73.

Solet, D, R Zoloth, C Sullivan, J Jewett, and DM Michaels. 1989. Patterns of mortality in pulp and paper workers. J Occup Med 31:627-630.

Torén, K, S Hagberg, and H Westberg. 1996. Health effects of working in pulp and paper mills: Exposure, obstructive airways diseases, hypersensitivity reactions, and cardiovascular diseases. Am J Ind Med 29:111-122.

Torén, K, B Järvholm, and U Morgan. 1989. Mortality from asthma and chronic obstructive pulmonary diseases among workers in a soft paper mill: A case referent study. Br J Ind Med 46:192-195.

Torén, K, B Persson, and G Wingren. 1996. Health effects of working in pulp and paper mills: Malignant diseases. Am J Ind Med 29:123-130.

Torén, K, G. Sällsten, and B Järvholm. 1991. Mortality from asthma, chronic obstructive pulmonary disease, respiratory system cancer among paper mill workers: A case referent study. Am J Ind Med 19:729-737.

US Department of Commerce. 1983. Pulp and Paper Mills. (PB 83-115766). Washington, DC: US Department of Commerce.

—.1993. Selected Occupational Fatalities Related to Pulp Paper and Paperboard Mills as Found in Reports of OSHA Fatality/Catastrophe Investigations. (PB93-213502). Washington, DC: US Department of Commerce.

Weidenmüller, R. 1984. Papermaking, the Art and Craft of Handmade Paper. San Diego, CA: Thorfinn International Marketing Consultants Inc.

Wingren, G, H Kling, and O Axelson. 1985. Gastric cancer among paper mill workers. J Occup Med 27:715.

Wingren, G, B Persson, K Torén, and O Axelson. 1991. Mortality patterns among pulp and paper mill workers in Sweden: A case-referent study. Am J Ind Med 20:769-774.

Workers’ Compensation Board of British Columbia. 1995. Personal communication.