Pressurized Can End With Vent Score and Shield
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Solution Overview
Problem
Pressurized food cans experience rapid gas release upon opening, leading to 'spurting' of product, which can be harmful and dangerous, and the easy open ends may result in uncontrolled severing of the aperture panel, posing a risk of missile-like behavior.
Innovation Solution
An easy open end design featuring a vent score that ruptures to form a vent opening before the main aperture score, allowing pressure release while keeping the aperture score intact, and a shield mechanism to contain ejected product, preventing it from reaching the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a pressurised container is opened rapidly, then the internal pressure is released quickly, but this causes spurting of product and potential safety hazards
Solution Approach 1:
The aperture score is segmented into two distinct stages: a vent score portion that ruptures first to release pressure, and a main aperture score that ruptures afterward to open the container. This segmentation allows controlled pressure release before full opening, preventing product spurting while maintaining quick access.
Solution Approach 2:
The vent score is designed to rupture automatically as a preliminary action before the main aperture opens. This preliminary pressure release occurs as the consumer begins to lift the tab, preparing the system for safe full opening by eliminating excess pressure that would cause spurting.
2Ease of operation
If the aperture score ruptures uncontrollably, then the aperture panel may missile, but this creates safety dangers for consumers
Solution Approach 1:
The aperture score is divided into a vent score portion and a main aperture score portion that rupture at different times. The vent score breaks first in a controlled manner, followed by the main aperture, preventing uncontrolled missile-like ejection of the aperture panel while maintaining easy opening.
Solution Approach 2:
The vent score provides beforehand cushioning by releasing internal pressure before the main aperture opens. This pressure equalization prevents violent panel ejection, cushioning the system against missile dangers while preserving ease of operation.
3Ease of manufacture
If thinner gauge metal is used for the can, then manufacturing cost and environmental impact are reduced, but the can requires internal pressure support for rigidity
Solution Approach 1:
The can utilizes internal gas pressure (pneumatics) to provide structural support and rigidity to the thinner gauge metal walls. The pressurized headspace acts as an internal support system, allowing the use of thinner, more cost-effective materials while maintaining necessary structural integrity for handling and transport.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The two-stage opening mechanism controls the pressure release, preventing missile-like behavior of the aperture panel and shields the user from ejected product, minimizing the risk of harm and damage.
Implementation Method 1
a vent score, which is ruptured to form a vent opening, before the main aperture score begins to rupture. The vent opening allows the internal pressure in the container to be released
Data Source
AI summary
An easy open end for a pressurized food container, having an end panel and a conventional aperture score, surrounding the periphery of an aperture through which the contents of the container may be dispensed. A tab is provided to facilitate easy opening of the aperture. The easy open end also includes a vent score, which is arranged to rupture before the main aperture score, to vent the internal pressure in the container, before the container is opened. The end panel and/or tab also defines a shield to prevent the egress of product from the vent opening, when the vent score is severed.