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Research Papers

A Mechanics of Materials Model for the Creping Process

[+] Author and Article Information
Melur K. Ramasubramanian1

 Department of Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Raleigh, NC 27695-7910rammk@ncsu.edu

Zhaohui Sun, Guang Chen

 Department of Mechanical and Aerospace Engineering, North Carolina State University, Campus Box 7910, Raleigh, NC 27695-7910

1

Corresponding author.

J. Manuf. Sci. Eng 133(5), 051011 (Oct 20, 2011) (8 pages) doi:10.1115/1.4004925 History: Received December 14, 2010; Accepted June 24, 2011; Published October 20, 2011; Online October 20, 2011

The manufacture of low density paper such as tissue and towel utilizes the creping process that consists of adhesively bonding the paper in wet state onto the surface of a smooth drying cylinder and scraping it off with a blade once dried. In this paper, a mechanics of materials description of the creping process is presented. Based upon previous experimental observations, the mechanism of this creping process is proposed as a periodic debonding with a strength-of-materials failure criterion applied and buckling sequence of an elastic thin film. Numerical calculations show results consistent with experimental data and known industrial observations. Crepe wavelength versus creping angle data from experiments can be satisfactorily reproduced by a reasonable set of values for input parameters to the model. Parametric study shows the adhesive shear strength and the sheet stiffness most significantly affect the crepe wavelength and the creping force. The model provides guidance in understanding and optimizing the creping process to produce high quality products.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the creping process

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Figure 2

The sequence of events observed during creping. (a) Structure before creping, (b) Propagation of delamination zone, and (c) buckling of paper layer

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Figure 3

Creped sheet of paper for a creping angle of (A) and (B), in which the creping direction is horizontal [2]

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Figure 4

The isolated paper film element and the adhesive layer element (a) Infinitesimal paper film element and (b) infinitesimal adhesive layer element

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Figure 5

Components of applied blade forces and their relationship to blade angle

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Figure 6

Normalized crepe wavelength and creping force as a function of creping angle

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Figure 7

Crepe wavelength and creping force versus flat sheet stiffness, plotted for increasing sheet thicknesses

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Figure 8

Effect of adhesive shear strength and elastic modulus on the crepe wavelength and creping force for different sheet moduli

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Figure 9

Effect of adhesive shear strength plotted for various adhesive moduli values

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Figure 10

Effect of Adhesive normal strength on crepe wavelength and creping force for different adhesive elastic modulus

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Figure 11

Effect of sheet-blade contact friction coefficient on crepe wavelength

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Figure 12

Adhesive stresses as a function of distance from the crack tip

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