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Ink and Speck Dispersion and Removal

Published online by Cambridge University Press:  15 February 2011

Mahendra R. Doshi  and
John H. Klungness
Mahendra R. Doshi
Affiliation:
Marathon Enginers/Architects/Planners, Inc., Doshi and Associates Inc., Appleton, WI
John H. Klungness
Affiliation:
USDA Forest Service, Forest Products Laboratory, One Gifford Pinchot Dr., Madison, WI 53705
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Abstract

Advances in printing technology have posted serious problems for the deinking industry. When ink is fused, as in laser printing and the photocopy process, when water resistant binders are included in coatings or ink formulations, and when varnishes are applied to printed papers, conventional methods fail to disperse inks and specks. The objective of this article is to review different approaches available for removing these inks and specks. Copying processes, coatings, and varnishing processes are discussed prior to discussing deinking and speck removal processes.

Deinking ideally involves intense mechanical, chemical, and thermal action needed to detach non-dispersible inks from fibers. The detached ink is then removed by screens, cleaners, washing, and the flotation process. If higher brightness and cleanliness are desired, high-consistency dispersion, together with bleaching or the use of agglomerating chemicals (for photocopy-laser toners), may have to be considered. For coating specks, increasing the pH. increased pulping time, and removal by cleaners are typically used to reduce the number and size of specks. Varnish specks can be more difficult to remove than coating specks, as they are resistant to chemical treatment and are not easily removed by centrifugal cleaners. Flotation removal holds promise for removing varnish specks if particle size is controlled.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 266: Symposium LA – Materials Interactions Relevant to Recycling of Wood-Based Materials , 1992 , 249
Copyright
Copyright © Materials Research Society 1992

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References

1. Kleinau, J.M., in Secondary Fiber and non-wood Pulping, edited by Hamilton, F. and Leopold, B., (TAPPI, Atlanta, and CPPA, Montreal, 3: 1978) pp. 159–178.Google Scholar
2. Seldin, I., in TAPPI Pulping Conf., Book 2 (Nov.1985) pp. 303–311.Google Scholar
3. Quick, T.H., Hodgson, K.T., in TAPPI Pulping Conf., Book 3 (Nov. 1985) pp. 561–566Google Scholar
4. Green, C.J. Jr., U.S.Patent. No. 3 635 789 (18 January 1972).Google Scholar
5. Pfalzer, L., in TAPPI Pulping Conf., (Nov. 1978) pp. 369–374.; in Tappi J. 62, (7) (July 1979) pp. 27–30Google Scholar
6. Ortner, H., Pfalzer, L., Bergfeld, D., Fischer, S., Ger. Patent.No. 3 200 893 (1 June 1983).Google Scholar
7. Wood, D.L., Wood, D.C., U.S. Patent-No. 4 561 933 (15 April 1985).Google Scholar
8. Quick, T. H., U.S. Patent No. 4 276 118 (30 June 1981); Also Can. Patent No. 1 148 705 (28 June 1983).Google Scholar
9. Makita, T., Shizuoka-Xen Seishi Kogyo Shikenjo Hokoku 38 (1986) pp.1–8. [Jap.]Google Scholar
10. Darlington, W. B, in TAPPI Pulping Conf., Book 1 (Oct. 1988) pp. 95–100; Also in Tappi J. 72, (1) (Jan. 1989) pp.35–38.Google Scholar
11. Darlington, W.B., Hui, S.H., Hipolit, K.J., in 77th CPPA Ann. Mtg. proc. (1991) pp. A229–233.Google Scholar
12. Longhini, D.A., in Wastepaper II Conf. Proc. (Miller Freeman Publishers 1991).Google Scholar
13. Dexter, R., Presented at Secondary Fibers Continuing Education Course, Doshi & Associates, June, 1991, Appleton, WI.Google Scholar
14. Olson, C.R., Sutman, F.R., Richmann, S.K., Letscher, M.B., in TAPPI Pulping Conf. proc. (Nov. 1992,) in Press.Google Scholar
15. LaPointe, M., Marchildon, L., Bonnelly, B., in TAPPI Pulping Conf. proc., Book 1 (Oct. 1988) pp. 81–94Google Scholar
16. Rangamannar, G., Silveri, L., in TAPPI Pulping Conf. proc., Book 1 (Oct. 1989) pp. 381–390.Google Scholar
17. Matzke, W., Selder, H., in TAPPI Pulping Conf. proc., Book 3 (Oct. 1986). pp. 597–605.Google Scholar
18. Gilkey, M.W., Mark, E.L., in TAPPI Pulping Conf. Proc., Book 3 (Nov. 1985). pp. 567–571Google Scholar
19. Ortner, H., Fischer, S., Progress in Paper Recycling, 1 (1) (Oct. 1991). 46–53 Google Scholar
20. Carr, W.F., in TAPPI Conf. Proc., Book 1(Oct. 1990) pp. 111–121.Google Scholar
21. Okada, E., Skaar, T.F., Wastepaper II Conf. Proc.,( Miller Freeman Publishers) 1991.Google Scholar
22. Galland, G., Vernac, Y., Amand, F. Saint, Bernard, E., Paper Technology 32 (12) 30–35, (1991).Google Scholar
23. Bassemir, R.W., TAPPI Pulping Conf. Proc., 311–313 (Nov. 1978);Also TAPPI J. 62 (7), 25–26 (July 1979).Google Scholar
24. Chatterjee, P.C., Ramaswamy, R., Brit. Ink Maker 17 (2), 76–79 (Feb. 1975).Google Scholar
25. McCool, M.A., Silveri, L., Tappi J., 70 (11) (Nov.1987).Google Scholar
26. Vanderhoff, J.W., in 3rd Inter. Conf. Org. Coatings Sci. Techol., edited by G.G. Parfitt, A.V. Patsis, 1 (July 1977) PP.244–261; in Intern. Conf. Org. Coatings Sci. Technol. Proc., 355–384 (July 1977).Google Scholar
27. Vanderhoff, J.W., Proc. TAPPI Pulping Conf., p 89–94 (Sept. 1975).Google Scholar
28. Forester, W. K, in TAPPI Pulping Conf. Proc., Book 2, (Oct. 1986) pp. 419–423; also, Tappi J. 70 (5) 127–130 (May 1987).Google Scholar
29. Anon. Tappi J., 63 (12) 19–20 (Dec. 1980).Google Scholar
30. Naimpally, A.V., Appita, 35 (3), 242 (Nov. 1981).Google Scholar
31. Turai, L.L., TAPPI Pulping Conf. Proc., 387 (1982). “Portions of this article are taken directly, by permission, from Progress in Paper Recycling, Vol.1, No.l, P 72–75, Nov (1991)”Google Scholar