Domed Pressure Relief Device With Arc Coin Line
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Solution Overview
Problem
Existing pressure relief devices for aerosol cans face challenges in maintaining reproducible venting pressures due to variability in coining tool wear and material thickness, leading to a narrow difference between designed and actual venting pressures, which can result in premature failure.
Innovation Solution
A pressure relief device with a domed construction featuring a sloped sidewall and an arc-shaped coined line, providing a venting pressure of at least 380 psig and a dome reversal pressure at least 50 psig higher than the venting pressure, ensuring the can bottom can withstand significant pressures without bursting, even if venting fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a deeper coin depth is used to ensure adequate venting pressure, then the venting pressure is maintained, but the remaining web becomes thinner and may develop micro cracks, reducing reliability
Solution Approach 1:
The patent changes the geometric parameters of the coined line, specifically using a shallower coin depth (0.008 to 0.012 inches) compared to traditional deeper coins. This parameter change allows the remaining web to maintain sufficient thickness and structural integrity while still achieving the desired venting pressure through optimized coin line geometry and positioning.
2Manufacturing precision
If frequent product sampling and testing are performed to monitor coining tool wear, then manufacturing precision is maintained, but manufacturing costs and time increase
Solution Approach 1:
The patent employs self-aligning features and geometric design that allow the coined line to automatically position itself during the coining process. This self-service mechanism reduces the need for frequent monitoring and adjustment, as the process becomes more autonomous and less sensitive to tool wear variations.
3Adaptability or versatility
If the starting material thickness varies, then manufacturing flexibility is improved, but the venting pressure and rupture strength become unpredictable
Solution Approach 1:
The patent compensates for material thickness variations by adjusting the coin depth and positioning parameters. The shallower coin depth (0.008 to 0.012 inches) combined with optimized coin line geometry allows the system to accommodate a range of starting material thicknesses while maintaining consistent venting pressure and rupture strength characteristics.
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 ensures reliable and reproducible pressure relief, reducing the risk of bursting failure by maintaining a substantial differential between venting and failure pressures, thus minimizing the impact of manufacturing variations.
Implementation Method 1
In operation, the bottom fractures along the coined lines (or curvatures) in response to an over pressurization of the container contents thereby creating vent openings
Implementation Method 2
providing a venting pressure of at least 380 psig and a dome reversal pressure at least 50 psig higher than the venting pressure, ensuring the can bottom can withstand significant pressures without bursting
Data Source
AI summary
A pressure relief device of domed construction for venting an internally pressurized container. The pressure release device includes a coined pressure vent and is characterized by a relatively high venting pressure in combination with a failure pressure in the absence of venting which is higher than the intended venting pressure. The pressure relief device includes a sloped sidewall having an outer annular segment and a sloped annular intermediate segment. The sloped annular intermediate segment has a width dimension greater than the width dimension of the outer annular segment. A circular central plateau defines a flat dome top. The circular central plateau has a center point with an arc shaped coin line extending about an arc with the apex of the arc positioned at the center point of the circular central plateau.