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Research Papers: Mechanisms and Robotics

Stiffness Characteristics of Carton Folds for Packaging

[+] Author and Article Information
Jian S. Dai

Department of Mechanical Engineering, King’s College London, University of London, Strand, London WC2R 2LS, UKjian.dai@kcl.ac.uk

Ferdinando Cannella

Department of Mechanical Engineering, King’s College London, University of London, Strand, London WC2R 2LS, UKfcannell@mta01.univpm.it

J. Mech. Des 130(2), 022305 (Dec 27, 2007) (7 pages) doi:10.1115/1.2813785 History: Received November 17, 2005; Revised March 30, 2007; Published December 27, 2007

Recent studies for packaging using cartons have modeled carton folds as equivalent mechanisms by considering creases as revolute joints and panels as links. This raises the interest in the study of stiffness characteristics of creases, which have a variable stiffness in contrast to a constant stiffness of a revolute joint and subsequently that of a whole carton fold. This paper investigates the stiffness characteristics of creases and reveals for the first time the folding motion and moment diagram in carton manipulation. Three characteristic stages were provided to characterize the crease stiffness, which has a variable value during carton manipulation. The paper further investigates the integrated stiffness of a combination joint and develops the integrated stiffness of a complete carton fold. The study is then extended to the integrated stiffness of a type of carton folds.

Copyright © 2008 by American Society of Mechanical Engineers
Topics: Torque , Stiffness , Motion
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Figures

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Figure 4

The equivalent mechanism

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Figure 5

A measurement chain

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Figure 6

A manipulating finger attached with a strain-gauge beam transducer

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Figure 7

Experimental motion-moment diagram

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Figure 8

Crease motion and moment diagram

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Figure 9

Crease motion-moment characteristics in multiple folding

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Figure 10

Crease stiffness kc(θ) per length unit versus folding angle

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Figure 11

Standard deviation in measurements of manipulating motion and moment

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Figure 12

Equivalent guiding linkage of a carton

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Figure 13

Equivalent mechanism with guiding linkages at two vertices

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Figure 14

Folding stiffness of a carton

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Figure 15

Aggregate stiffness of a crash-lock carton

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Figure 16

Experimental result of the aggregate stiffness of a crash-lock carton

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Figure 17

Equivalent mechanism of a six-sided crash-lock carton

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Figure 1

Crease line for folding carton panels

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Figure 3

The carton fold described in the form of revolute joints

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