Predicting Traction in Web Handling

Ducotey, K. S.; Good, J. K.

doi:10.1115/1.2834112

Cited by 22 publications

(16 citation statements)

References 7 publications

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“…For a permeable webmaterial, air diffusion through the web reduces the amount of entrained air (12), (13), (20) - (23) . This phenomenon actually works in favor of keeping the effective friction coefficient high.…”

Section: 2 Permeable Websmentioning

confidence: 99%

“…When a web is supported by a roller, the air entrainment causes mixed lubrication conditions in the web/roller interface (12), (20) - (26) . The static equilibrium of the web requires that the beltwrap pressure, T/R, to be balanced partially by asperity contact pressure and partially by air pressure.…”

Section: 1 Impermeable Websmentioning

confidence: 99%

“…In this case, the web is supported partially by the rigid body contact of the asperities, and partially by the air layer; and, consequently the effective friction coefficient is re- Fig. 3 The flat-recording head configuration duced (12), (13), (20) - (26) . At sufficiently high web transport speed the effective friction coefficient can become zero.…”

Section: Introductionmentioning

confidence: 99%

“…A flexible web drags the surrounding air into the guide-web interface while it travels over rollers or stationary guides. The resulting phenomenon is known as the foil bearing problem and has been extensively studied (12), (13) . The foil bearing problem stems from low Reynolds number effects hence the fluid mechanics is governed by the Reynolds lubrication equation (12) .…”

Section: Introductionmentioning

confidence: 99%

“…The resulting phenomenon is known as the foil bearing problem and has been extensively studied (12), (13) . The foil bearing problem stems from low Reynolds number effects hence the fluid mechanics is governed by the Reynolds lubrication equation (12) . Dynamic stability of a thin web traveling between rollers can be significantly affected by the surrounding air, as the mass of air is comparable to mass of the web (14) -(18) .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Mechanics of Thin, Flexible, Translating Media and Their Interactions with Surrounding Air

Müftü

2005

JSME Int. J., Ser. C

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Thin, flexible, continuous structures known as webs are used in a wide range of industrial applications. These structures interact with the surrounding air in beneficial or detrimental ways, depending on the application and the process parameters. A review of the literature related to modeling and experimental work on (mostly) the steady state fluid-structure interactions is given. Equilibrium equations of web mechanics, and the inertia dominated and viscosity dominated air flows are presented. Simulation examples from four different industrial applications; web/air-bar interactions; roller/web interactions for permeable and impermeable webs; and the flat-top recording-head/magnetic-tape interactions, are presented.

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Section: 2 Permeable Websmentioning

confidence: 99%

Section: 1 Impermeable Websmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mechanics of Thin, Flexible, Translating Media and Their Interactions with Surrounding Air

Müftü

2005

JSME Int. J., Ser. C

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Prediction of slippage onset condition between web and steel roller

et al. 2006

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This paper describes the theoretical modeling for the prediction of slippage onset condition between the paper web and steel roller with experimental verifications. For the first step of modeling, the occurrence of slippage is observed for the cases of uncoated paper (newsprint) and coated paper, and the relation between the slip ratio and roller velocity is measured by changing web tension. Two kinds of theoretical model are proposed, and the applicability of the models is confirmed experimentally. List of symbolsB web wrap angle (rad) d shape function (m) F friction force between web and roller (N) f traction force at bearing (N) h entrained air film thickness (m) k web permeability (m 2 ) L web width (m) M b bearing torque (Nm) p air film pressure (Pa) p a ambient pressure (Pa) R roller radius (m) r bearing radius (m) s slip ratio T web tension (N/m) t w web thickness (m) U total velocity (= U r + U w ) (m/s) U r roller velocity (m/s) U slip slip onset velocity (m/s) U w web velocity (m/s) w web deflection (m) x coordinate in the web transport direction (m) x e outlet position of web wrap angle (m) x s inlet position of web wrap angle (m) z coordinate in the cross machine direction (m) g air viscosity (Pa s) l traction coefficient between web and roller l bbearing friction coefficient l l local traction coefficient r rms composite roughness (m) r r rms roughness of roller surface (m) r w rms roughness of web surface (m)

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Effect of taper tension profile on the telescoping in a winding process of high speed roll to roll printing systems

et al. 2009

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Winding is an integral operation in almost every roll to roll system. A center-wound roll is one of the suitable and general schemes in a winding mechanism. In general, the quality of wound roll is known to be related to the lateral displacement error and starring defect of a wound roll. Especially, a telescoping within a center-wound roll can cause damages such as misalignment between layers, folding, wrinkle, etc. Taper tension is known to be one of the major factors which affect the shape of a wound roll. It is therefore necessary to analyze the relationship between taper tension profile and telescoping within the center-wound roll to prevent winding failure and to sustain high quality of the printed materials. It is hard to compensate for undesirable winding roll shapes such as telescoping, because a winding is commonly a final process in roll to roll systems and has no feedback control mechanism to correct winding roll shape directly during winding operation. Therefore, an optimal taper tension profile and the accurate control of it in a winding section could be one way to shape the fail-safe of a wound roll. Through the correlation between taper tension profile and telescoping in a winding process, a mathematical model for the telescoping due to tension distribution in cross machine direction was developed, and verified by experimental study. A new logic to determine the proper taper tension profile was designed by combining and analyzing the winding mechanism which includes nip induced tension model, relationship between taper tension profile and telescoping, relationship between taper value and telescoping. Numerical simulations and experimental results show that the proposed method is very useful for determining the desirable taper tension profile during the winding process and preventing defects of winding roll shape such as telescoping.

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Predicting Traction in Web Handling

Cited by 22 publications

References 7 publications

Mechanics of Thin, Flexible, Translating Media and Their Interactions with Surrounding Air

Mechanics of Thin, Flexible, Translating Media and Their Interactions with Surrounding Air

Prediction of slippage onset condition between web and steel roller

Effect of taper tension profile on the telescoping in a winding process of high speed roll to roll printing systems

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