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A review of chemical and physical factors influencing Yankee dryer coatings Gary S. Furman and Winston Su, Nalco Chemical Company, Naperville, Illinois, USA Keywords: Adhesives, Creping, Tissue papers, Yankee dryers, Review. SUMMARY: Various chemical additives are utilized to pro- vide thin adhesive coatings on Yankee dryers during the pro- duction of creped tissue papers. These coatings aid in imparting the desired degree of crepe to the tissue sheet. The creping process is a delicate balance between adhesive and release forces, which has a dominating

PAPER PHYSICS Nordic Pulp & Paper Research Journal Vol 31 no (3) 2016 448 Development and evaluation of a high-speed creping simulator for tissue Pyry Hämäläinen, Nils Hallbäck and Christophe Barbier KEYWORDS: Creping, Test methods, Tissue, Adhesives, Low weight papers, Adhesion, Yankee dryer SUMMARY: An innovative creping simulator for tissue has been developed to meet the requirements set by both industrial needs, such as speed and process step duration, and research ambitions, such as flexibility for modifications and efficient operation. Some

cylinder. They were obtained by collecting material from the cleaning doctor and by scraping off coating in between the cleaning doctor and the spray boom with a hand scraper. The conditions on the Yankee dryer surface were varied by varying specific creping additives. Chemical and morpholo- gical analyses were performed on the samples: the former com- prised carbohydrate analysis and nitrogen analysis. Analyses of the scrapings were compared with those of the creped paper. Replicas of the coating layer were made in silicon rubber in order to show its microstructure. It

on fine particle floc properties Fadat, G. The influence of associative rheo- 1 : 191 logy modifiers on paper coating - Felix, J. M. Characterization of cellulose fibers 1:200 Gatenholm, P using inverse gas chromatography - Nordic Pulp and Paper Research Journal no. 411993 Authors Articles No.: page Furman, G. S. A review of chemical and physical 1:217 Su, W factors influencing Yankee dryer coatings pp Gill, R. A. Interactions between polymers and 1:167 precipitated calcium carbonate filler - Modern analytical tools shed light on agglomeration

, fluorescence (Valeur, 2002; Lakowicz, 2006). Aim of the study The aim of this project was to measure fluorescence on a laboratory scale using an optical brightener in a mix with creping chemicals normally used for adjusting adhesion between paper web and a Yankee dryer. The fluorescence was measured using an UV-LED on a laboratory cylinder dryer. The diode emitted ultraviolet light and collected the reflected light, which had a different wavelength than emitted light. The fluorescence from different thickness of coating and for varying amounts of optical brightener in the

, Atlanta, USA, 20 1 0 Bishop, C . (2006) : Pattern recogn it ion and mach ine learn i ng , Springer, USA, pp . 55-57. Georg iou , T., L indqu ist, A. (2003) : Ku l l back-Leib ler Approximation of Spectral Density Functions, I EEE Transactions on i nformation theory, 49(1 1 ) , 291 0-29 1 7 . Furman, G, Su, W ( 1 993) : A review of chemical and physical factors influencing Yankee dryer coatings, Nordic pulp and paper research journal , 5( 1 1 ) Hol lmark, H . ( 1 972) : Study of the creping process i n an experimental paper mach ine , STF I (Swed

Appleton, Wisconsin, USA Furman, G., Winston, S. (1993) A review of chemical and physical factors influencing Yankee dryer coatings. Nord. Pulp Pap. Res. J. 8(1):217–222. 10.3183/npprj-1993-08-01-p217-222 Furman G. Winston S. 1993 A review of chemical and physical factors influencing Yankee dryer coatings Nord. Pulp Pap. Res. J. 8 1 217 222 Hubbe, M. A. (2014) Prospects for maintaining strength of paper and paperboard while using less forest resources: A review. Bioresources 9(1):1634–1763. Hubbe M. A. 2014 Prospects for maintaining strength of paper and paperboard while

., Müller, F. and Weiss, H. (1955): Über das "Blasigwerden" von Papieren, Das Papier, 9(7/8), 133-142. Charles, J. A. (2000): Diagnostic Tools for Yankee Dryers, TAPPI Engineering Conference, Atlanta Everett, H. A. (1943): Mixtures of Gases and Vapors, D. Van Nostrand Company Inc., 366-368. Hashemi, S. J. and Douglas, W. J. M. (2003): Moisture Nonuniformity in Drying Paper: Measurement and Relation to Process Parameters, Drying Technology, 21(2), 329-347. Hashemi, S. J. and Douglas, W. J. M. (2004): Comparative Techniques For Characterizing Drying Nonuniformity

elastic structure with a good capacity to absorb water. Two different drying techniques are used, the Yankee-cylinder and the through air drying technique (TAD). The Yankee-cylinder has been the traditional method but during the last 10 years a number of TAD-dryers have been built. So far there are 8 TAD-dryers in operation in Europe but none in Sweden. The Yankee-dryer. On the Yankee-dryer the paper is dried on one large cast iron cylinder with a diameter of 5–7 m. It is heated with steam on the inside and hot air blown at high veloci- ties on the outside of the web

27 – influence of water 39–64 – moisture and temperature 30–32 – rigidity 31 – stress strain properties 27–30 wood-free paper, coated 343 wood polymers – arrangement 22 – glass transition temperatures 25 – moisture sorption 24 – properties 21–25 – softening 25 Y yankee-dryer 259–260 397 D E G R U Y T E R www.degruyter.com Holzforschung is an international scholarly journal that publishes cutting-edge research on the biol- ogy, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree