Simulation of creping pattern in tissue paper

Abstract

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 work consisted of bath tissue and towel grades. The significant difference between the samples was in the number of crepe folds. The tissue sheets were analyzed with an imaging system. The variation of crepe folds in images was studied in spatial frequency space through 2D Welch spectrum. It was noticed that the difference in creping pattern structure between the samples can be seen clearly in spectra. The creping pattern was simulated based on the creping pattern variation found from the Welch spectra of tissue paper images. The simulation was based on a set of sinusoidal terms representing several orientations and amplitudes. The amplitudes of sinusoidal terms located in regular grid in spectra were approximated with 2D normal distribution. Thus, the structure of creping pattern can be represented with three parameters originating from the deviations and location of 2D normal distribution. The creping pattern reconstructed with simulations contains the relevant features in the creping pattern of true tissue images.

Understanding the Effect of Machine Technology and Cellulosic Fibers on Tissue Properties – A Review

“…This creping process yields a super creped product that is unusual. At higher angles, the macro-folds are not significantly formed (Raunio and Ritala 2012).…”

Influence of tissue paper converting conditions on finished product softness

“…Examples of tissue products include bathroom tissue, kitchen towels, industrial wipes, table napkins, facial tissue, and many others (Kimari 2000). Commonly, tissue is very well distinguished from other paper grades, due to its low grammage, typically lower than 25 g/m 2 according to Hollmark (1983), and because of its creped structure, yielding a rather distinctive surface (Hollmark 1983;Abbott and Schnabel 2000;Kimari 2000; Ramasubramanian and Shmagin 2000;Ho et al 2007;Gigac and Fišerová 2008;Ramasubramanian et al 2011;Raunio and Ritala 2012;Boudreau and Germgård 2014;Anukul et al 2015).…”

“…During production, many aspects influence tissue paper softness, such as the type of fibers, refining additives used, creping process, and converting process (Kimari 2000;Ramasubramanian and Shmagin 2000;Ho et al 2007;Gigac and Fišerová 2008;Ramasubramanian et al 2011;Raunio and Ritala 2012;Boudreau and Germgård 2014;Rosen et al 2014;Anukul et al 2015;de Assis et al 2018a;de Assis et al 2018b;Raunio et al 2018;Spina and Cavalcante 2018). This last aspect consists of a series of operations, such as unwinding, embossing, printing, perforating, rewinding, cutting and packaging, as shown in Fig.…”

Performance and sustainability vs. the shelf price of tissue paper kitchen towels

“…During the creping process, the creping blade scrapes the tissue sheet of the Yankee dryer surface, resulting in a delaminated and stretchable tissue paper structure. (Nanko et al 2005;Raunio and Ritala 2012;Boudreau and Germgard 2014). Advanced technology also contributes to higher stretchability in tissue paper products because the inter-fiber bonding is not well developed.…”

“…The creping process is commonly used to enhance tissue paper properties. During the creping process, the creping blade scrapes the tissue sheet of the Yankee dryer surface, resulting in a delaminated tissue paper structure with higher bulk, softness, and absorbency (Nanko et al 2005;Raunio and Ritala 2012;Boudreau and Germgard 2014). Structured fabrics can be used to enhance tissue paper properties by imparting compressed and uncompressed areas in the tissue paper web.…”