Pull tab of beverage containers

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SUMMARY

The discussion centers on the engineering design of beverage container pull tabs, specifically analyzing the forces involved when opening a can. Using the lever principle, participants calculated the force exerted on the scored section of the can's top when a 10N force is applied to the pull tab. The calculation, based on the lever arm lengths (R = 1.75cm and r = 0.75cm), confirms that the force applied to the scored section is approximately 23.33N. This demonstrates the effectiveness of the pull tab mechanism in beverage engineering.

PREREQUISITES
  • Understanding of basic physics principles, specifically levers and torque.
  • Familiarity with force measurement in Newtons (N).
  • Knowledge of mechanical advantage and its calculation.
  • Experience with beverage container design and engineering concepts.
NEXT STEPS
  • Explore the principles of mechanical advantage in levers.
  • Learn about torque calculations in engineering applications.
  • Investigate different designs of beverage container openings and their efficiency.
  • Study the materials used in beverage can manufacturing and their impact on design.
USEFUL FOR

Engineers, product designers, and anyone interested in the mechanics of beverage container design will benefit from this discussion.

noppawit
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Beverage engineering. The pull tab was a major advance in the engineering design of beverage containers. The tab pivots on a central bolt in the can's top. When you pull upward on one end of the tab, the other end presses downward on a portion of the can's top that has been scored. If you pull upward with a 10N force, approximately what is the magnitude of the force applied to the scored section? (You will need to examine a can with a pull tab.)

After I measure the pull tab, I got:
Pull tab length is 2.5cm
From pulling zone to pivot is 1.75cm, let it = R
and from pivot to pressing zone is 0.75, let it = r

Given, pull upward 10N

Can I calculate by using
F1R = F2r
10 * 1.75 = 0.75 * F2
Fpressing = 23.33N

Is this correct?
 
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Yes it's correct, given the numbers you have for R and r.
 
did i hear the sound of a beer can being opened … ?

noppawit said:
From pulling zone to pivot is 1.75cm, let it = R
and from pivot to pressing zone is 0.75, let it = r

Given, pull upward 10N

Can I calculate by using
F1R = F2r
10 * 1.75 = 0.75 * F2
Fpressing = 23.33N

Is this correct?

Hi noppawit! :smile:

Looks good!

It's a lever, so the gearing is the ratio of the lengths …

hmm … now pull one for me! :wink:

EDIT: oh … and one for Redbelly98 too! :biggrin:
 

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