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PAPER PHYSICS S i m u l at ion of crepi ng pattern i n t issue paper Jukka-Pekka Raun io and Risto Ritala KEYWORDS: Simulation, Creping, Tissue paper, Welch spectrum, Image SUMMARY: The key operation in tissue production is the creping at the Yankee cylinder. The tissue sheet is adhered to a Yankee cylinder and then detached from the surface with a blade . As a result a strong microstructure ­ crepe folds - is generated on the web. In this work the structure of creping pattern in CD and MD of tissue paper was studied. The samples available in this

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

unrestrained dried less than 10 %. Mechanical and chemical treatment of pulps and the utilization of sufficient strength additives (such as starch, CMC and nanocellulose) can have an improving effect on strength which, however, is typically not able to improve the elongation of paper above 20 % (Vishtal 2015 ; Khakalo 2017 ). However, elongations above 20 % can be achieved by creping and in-plane compaction operations that treat a formed fiber network mechanically. High elongation is a fundamental requirement for the development of advanced lightweight packaging solutions

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

Introduction Tissue products have promising future markets due to their sustainable raw material and the lack of competing materials. Therefore, it is expected that tissue manufacturing will continue to increase, which also increases the economic significance of understanding the optimization possibilities in the tissue making process. The present global main stream technology in tissue manufacturing, the dry crepe technology, was introduced over 100 years ago. During the last ten years, the tissue machine manufacturers have introduced new tissue machine concepts

fibres in the furnish. In this work, four pulps beaten to different levels were studied in vacuum dewatering trials. Mixing of the pulps, common in tissue manufacturing, was also performed. To simulate the suction boxes on a tissue machine, bench- scale laboratory equipment was used. Conditions typically used on a tissue machine regarding dwell times and vacuum levels were chosen. Paper properties relevant for tissue, like wet strength and absorption were measured on non-creped papers. To obtain information about the fibre properties, fibre characterization

A Syrian Cookbook

Nordic Pulp and Paper Research Journal Vol 24 no. 3/2009 309 KEYWORDS: Yankee cylinder coating, Thickness measure- ments, Fluorescence, Tissue paper SUMMARY: The Yankee cylinder coating thickness affects the crepe structure and therefore the quality of the tissue paper pro- duced. It is desirable that the coating thickness could be measu- red on-line so that the parameters affecting it can be controlled. In this paper, a laboratory scale method for on-line measure- ment of the coating thickness on a Yankee cylinder has been investigated. The technique was

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

Driving Toward Cairo I've lost the route leading Here. I know only this Deep river, these barns and cornfields And a telephone line—two wires Between the spaced poles—to remind Me of our connection and of our Loneliness. And the church Past the village of Anna, past Jonesboro, where Lincoln debated, Square small steeple transmitting The sweet sad assurance of those Hymns. The apple tree with Green fruit, the crepe myrtle Blazing, the double silos As the sun comes out. This Illinois landscape holds A home I've never known.