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Technical Briefs

On the Torque Characteristic of a Crash-Lock Carton Base

[+] Author and Article Information
Glen Mullineux

Department of Mechanical Engineering, Innovative Design and Manufacturing Research Centre, University of Bath, Bath BA2 7AY, UKg.mullineux@bath.ac.uk

J. Mech. Des 131(8), 084502 (Jul 09, 2009) (4 pages) doi:10.1115/1.3151800 History: Received August 27, 2008; Revised March 26, 2009; Published July 09, 2009

An important part of some packaging cartons is the crash-lock base. A recent investigation of the torque required for its erection has made some linearizing assumptions. It is here shown that these can be avoided as the relations connecting the angles between panels can be found. This also indicates that the final increase in the required torque is due to geometric effects rather than frictional ones.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Opening stages of a carton with a crash-lock base

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Figure 2

Carton board net for half of a crash-lock base

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Figure 3

Half of partially erected crash-lock base

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Figure 4

Graphs of angles θ41=θ23 and θ34 (deg) against angle ϕ (deg)

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Figure 5

Graphs of derivatives dθ41/dϕ=dθ23/dϕ and dθ34/dϕ against angle ϕ (deg)

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Figure 6

Graph of opening torque for a crease based on results in Refs. 3,16

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Figure 7

Graph of torque to erect (half) crash-lock carton base against opening angle (2ϕ)

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Figure 8

Graph of closing torque for a crease based on results in Ref. 16

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Figure 9

Graph of torque required to erect full crash-lock carton base against opening angle (2ϕ)

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