Numerical Stress Analysis of Wound Roll.

Tanimoto, Kouichi; Kohno, Kazukiyo; Yamamoto, Makoto; Watanabe, Toru

doi:10.2524/jtappij.51.176

Cited by 2 publications

(4 citation statements)

References 1 publication

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“…When both the nip and wound rolls are driven, the authors, [3], have given the following equation for T in :…”

Section: Wound-in Tensionmentioning

confidence: 99%

“…After their propositions, these models have been verified by many other researchers and several modifications of the models have been proposed. The present authors, [3], also extended the model and examined the conditions to cause wrinkles or breakage in a wound roll. This examination showed, however, that the applicability of the modified model is restricted to the analysis only of highly porous web or to the case of low-speed winding.…”

Section: Introductionmentioning

confidence: 97%

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confidence: 97%

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Wound stress of permeable papers with air-entrainment

Tanimoto

Kohno

Takahashi

et al. 2003

Archive of Applied Mechanics (Ingenieur Archiv)

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The quality of a wound roll is highly dependent upon the in-roll stress distribution, which is controlled by the operating parameters of the center-wind torque, nip and tension. With increasing demands for higher performance of paper winding systems in terms of higher winding speeds, wider web widths and larger wound roll diameters, it becomes of vital importance to determine and understand the optimum operating conditions of these machines. In this paper, a numerical formulation for estimating the in-roll stress of a wound roll is proposed with taking account of the effect of nonlinearity in web compressibility, airentrainment and permeance. The in-roll stress is calculated as the superposition of the stress increments caused by each winding. The theory of elasto-hydrodynamic lubrication with the compressibility of air is introduced to evaluate the effect of air-entrainment at the roll-inlet. Permeance of air is newly incorporated into the winding model, which is expressed under the assumption that permeance is proportional to the pressure difference of both sides of a web. In order to assure the applicability of the proposed theory, winding tests were conducted using the dry-end section of the paper-making pilot machine. The numerical analysis and experimental observation show the significant effect of the air-entrainment and permeance upon the in-roll stress. IntroductionIn the paper industry, winding is one of the important operations of the paper (or more generally 'web') handling process, which controls the quality of final products. With increasing demands for higher performance of paper winding machines, it is getting more delicate to maintain the stable winding operations. For example, high-speed winding of coated paper sometimes causes roll defects, such as irregular movement of the paper in its lateral direction and wrinkles, due to the air-entrainment in the wound roll.In order to cope with such difficulties, in-roll stress fields of wound rolls, especially the influences of winding parameters, have been investigated experimentally and theoretically by many researchers in the past. Researches [1] and [2] are well known as presenting basic winding models, and they are widely used for the process design of winding in paper industries. After their propositions, these models have been verified by many other researchers and several modifications of the models have been proposed. The present authors, [3], also extended the model and examined the conditions to cause wrinkles or breakage in a wound roll. This

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“…When both the nip and wound rolls are driven, the authors, [3], have given the following equation for T in :…”

Section: Wound-in Tensionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Wound stress of permeable papers with air-entrainment

Tanimoto

Kohno

Takahashi

et al. 2003

Archive of Applied Mechanics (Ingenieur Archiv)

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“…Web breaks are one of the most persisting runnability issues in pressrooms. The issue has been studied for a number of years in terms of pressroom 12th Fundamental Research Symposium, Oxford, September 2001 tension variation [1], basic strength properties and fracture toughness [2][3][4][5][6], effects of shives and other defects [7][8][9][10], effects of winding, reeling and roll structure [11][12][13][14], and web tension uniformity [15][16][17]. In spite of the overwhelming amount of information generated from these studies, there is, surprisingly, very little quantitative data showing a clear relationship between pressroom breaks and the above variables.…”

Section: Introductionmentioning

confidence: 99%

Factors Controlling Pressroom Runnability of Paper

Uesaka,

Ferahi,

Hristopulos

et al. 2001

Trans. Of the XIIth Fund. Res. Symp. Oxford, 2001

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Web breaks in pressrooms have been modelled in terms of web strength variations and tension variations to identify principal factors controlling the pressroom performance. The web strength variations and their scaling law (the size dependence) have been formulated based on an extreme statistics approach, and the distribution parameters have been determined for a number of mechanical printing grades. By using the tension variation statistics data obtained from a pressroom trial, a parametric study has been conducted to examine the relative magnitude of the effects of key paper properties. The predictions have been compared with field study data. Among the conventional paper properties, tensile strength and elastic stretch consistently predicted the break frequency. The strength uniformity parameter (Weibull exponent) was shown to have the highest impact on the break frequency based on the parametric study.

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Numerical Stress Analysis of Wound Roll.

Cited by 2 publications

References 1 publication

Wound stress of permeable papers with air-entrainment

Wound stress of permeable papers with air-entrainment

Factors Controlling Pressroom Runnability of Paper

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