Canning Container Lid Stiffness and Seal Calibration
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Solution Overview
Problem
Existing lid elements for canning containers suffer from insufficient stiffness, leading to buckling under high pressure differentials, and geometric issues that prevent accurate calibration of the seal status indicator, resulting in unreliable hermetic seals.
Innovation Solution
The improved lid element features a centrally disposed domed portion, an annular channel portion, and an annularly shaped peripheral portion with projections that enhance stiffness and ensure accurate calibration of the seal status indicator, allowing for reliable hermetic sealing and consistent pressure differential monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the lid element uses a conventional geometry design, then the manufacturing is simple, but the stiffness is insufficient leading to buckling under high pressure differentials
Solution Approach 1:
The lid element is divided into multiple functional zones: a domed portion for pressure indication, an annular channel portion for structural support, and a peripheral portion for sealing. This segmentation allows each zone to be optimized for its specific function while maintaining overall structural integrity and preventing buckling under pressure differentials.
Solution Approach 2:
The lid element transitions from a flat conventional design to a three-dimensional structure with a domed portion that extends axially outwardly. This dimensional change increases the moment of inertia and structural stiffness, enabling the lid to resist buckling while the dome's deformation provides visual pressure indication.
2Measurement precision
If the lid element uses a conventional geometry, then the manufacturing is straightforward, but the seal status indicator cannot be properly calibrated to pop at the desired pressure differential
Solution Approach 1:
The domed portion is designed with specific local geometric properties including a predetermined radius of curvature and axial height that are optimized for pressure indication. This localized geometric optimization allows the dome to deform and indicate seal status at the desired pressure differential while the rest of the lid maintains structural integrity.
Solution Approach 2:
The geometric parameters of the domed portion (radius of curvature, axial height, thickness) are specifically controlled and optimized to achieve the desired popping pressure differential. By adjusting these parameters, the lid element can be calibrated to indicate seal status at precise pressure differentials, improving measurement precision.
3Reliability
If the lid element has uniform thickness and simple geometry, then the manufacturing is easy, but it cannot simultaneously provide sufficient stiffness and accurate pressure indication
Solution Approach 1:
The lid element is segmented into distinct functional zones with different thicknesses and geometries: the domed portion for pressure indication, the annular channel portion for structural reinforcement, and the peripheral portion for sealing. This segmentation enables the structure to simultaneously provide stiffness for reliability and calibrated pressure indication.
Solution Approach 2:
The lid element employs varying material distributions and thicknesses across different zones, creating a composite-like structure where each zone contributes specific properties. The domed portion uses optimized thickness for pressure sensitivity, while the annular channel portion provides structural reinforcement, achieving both reliability and accurate indication.
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 enhanced lid element provides improved resistance to buckling and deformation, ensuring reliable hermetic sealing and consistent pressure differential monitoring, thereby maintaining the integrity of the sealed contents.
Implementation Method 1
the domed portion of the lid element will depress axially towards the interior of the container to visually indicate that the resulting seal is adequate
Implementation Method 2
the pressure differential present between the interior of the container and the ambient environment applies an axial pressure force to the lid element that aids in compressing the elastomeric ring
Data Source
AI summary
A lid assembly includes a lid element having an annularly shaped peripheral portion configured to be axially aligned with and disposed between a rim of a canning container and a radially extending portion of a retainer element when the lid assembly is engaging the canning container and the retainer element is removably coupled to the canning container. An annularly shaped sealing element is disposed on the peripheral portion of the lid element and is configured to directly engage the rim of the canning container when the lid assembly is contacting the canning container. A plurality of projections is formed in the peripheral portion of the lid element with each of the projections forming a distally disposed surface of the peripheral portion with respect to an exterior axial direction of the lid element extending away from an interior of the canning container when the lid assembly is engaging the rim.