Non-Arresting Vent Score Design for High-Pressure Beverage Cans
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Solution Overview
Problem
Conventional venting structures in beverage cans are inadequate for pressures above 482500N/m² (70 psi), leading to potential score rupture and panel failure during opening, especially in pressurized containers like carbonated soft drinks and beer.
Innovation Solution
A non-arresting vent score design that forms a flap upon rupture, allowing internal pressure to quickly create a large enough opening to vent pressures exceeding 482500N/m² (70 psi), featuring a central portion with a pair of lateral and side portions forming a hinge, enabling unimpeded propagation and a uniform score residual thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional venting structures are used in pressurized beverage cans, then venting function is provided, but score rupture and panel failure occur at pressures above 482500N/m²
Solution Approach 1:
The vent score is segmented into a first portion extending from the tab nose toward the rivet and a second portion extending from the first portion to the rear of the can end, with a check slot separating them. This segmentation allows the first portion to rupture and vent pressure while the check slot prevents immediate propagation to the second portion, maintaining structural integrity at high pressures.
Solution Approach 2:
The score residual thickness varies locally along the vent score path. The check slot has a score residual thickness greater than the first portion, creating a localized stronger region that arrests score propagation. This local quality differentiation enables the venting function while preventing catastrophic failure.
2Strength
If score residual thickness is increased to prevent score propagation, then structural strength is improved, but venting capability is reduced
Solution Approach 1:
The score residual thickness is not uniformly increased but is locally varied: the first portion has a thinner score residual to allow easy rupture and venting, while the check slot has a thicker score residual to arrest propagation. This local quality approach maintains both venting ease and structural strength.
Solution Approach 2:
The vent score is divided into segments with different score residual characteristics. The first portion is designed to rupture easily for venting, while the check slot segment has increased residual thickness to prevent propagation, resolving the contradiction between ease of venting and structural strength.
3Reliability
If check slot with thicker score residual is used to arrest score propagation, then score rupture control is improved, but vent opening size is limited
Solution Approach 1:
The vent score is segmented into a first portion that ruptures to create the vent opening and a second portion arrested by the check slot. The check slot is positioned and dimensioned to arrest propagation while allowing the first portion to form a sufficient vent opening area for effective pressure relief.
Solution Approach 2:
The check slot acts as an intermediary element between the venting function and structural integrity. It mediates by allowing controlled rupture in the first portion while preventing uncontrolled propagation to the second portion, thus enabling both adequate vent opening and score rupture control.
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 solution effectively achieves a vent test rating of at least 482500N/m² (70 psi), preventing sudden score propagation and ensuring safe opening of pressurized cans, making it suitable for commercial use in beverages with high internal pressures.
Implementation Method 1
the can internal pressure acts against the flap to quickly create a vent opening
Data Source
Figure 1
Figure 2~4
Figure 3
AI summary
A vent score lacks features to arrest score propagation. Rather encourages fast score propagation upon initial rupture. Venting is achieved through a flap configuration formed by the vent score.