Pressure Relief Valve Reservoirs to Prevent Wetting Fluid Migration
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Solution Overview
Problem
Existing one-way pressure relief valves with wetting fluids face issues with fluid migration, leading to a greasy appearance and reduced adhesion, which can result in the valve becoming detached from the package, potentially causing spoilage.
Innovation Solution
The introduction of wetting fluid reservoirs on the valve's textured surface helps retain the wetting fluid, minimizing migration and maintaining the valve's adhesion and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wetting fluid is added to the pressure relief valve to improve sealing, then the air-tight seal and valve operation are improved, but the wetting fluid can migrate out of the valve causing a greasy appearance and reduced adhesion
Solution Approach 1:
A release liner is introduced as an intermediary barrier between the wetting fluid and the external environment. The release liner prevents wetting fluid from migrating out of the valve while allowing the valve to function normally. This mediator solves the migration problem without affecting the sealing performance.
Solution Approach 2:
The adhesive is applied to the outer surface of the base before the wetting fluid can migrate and cause damage. This preliminary action ensures that the adhesive maintains its bonding capability throughout storage and handling, preventing the valve from detaching.
2Reliability
If excess wetting fluid is used to compensate for anticipated leakage, then the sealing is improved, but the valve appearance and adhesion are compromised due to increased migration
Solution Approach 1:
The release liner acts as a protective intermediary that allows the use of adequate wetting fluid for sealing without the harmful effects of migration. It blocks the wetting fluid from reaching the exterior surfaces while maintaining valve functionality.
Solution Approach 2:
The release liner is a permeable material that allows gas to pass through during valve operation but prevents liquid wetting fluid from migrating out. This selective permeability solves both the sealing and appearance problems.
3Strength
If wetting fluid migrates out of the valve, then the adhesive effectiveness is reduced, but the valve becomes detached from the package
Solution Approach 1:
The adhesive is applied to the outer surface of the base before wetting fluid migration can occur. This preliminary application ensures that the adhesive maintains its full bonding strength throughout storage and handling, preventing valve detachment.
Solution Approach 2:
The release liner serves as a protective barrier that prevents wetting fluid from contacting the adhesive. This intermediary protection ensures that the adhesive maintains its effectiveness and the valve remains securely attached to the package.
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 use of wetting fluid reservoirs enhances the valve's performance by ensuring a predictable and accurate opening and closing mechanism, maintaining the valve's appearance, and ensuring secure attachment to the package.
Implementation Method 1
The wetting fluid, such as a silicone oil, a graphite impregnated oil, a food grade oil, or a food grade silicone grease is typically added between the dry strap and base and around the vent to wet the facing surfaces of the dry strap and base. The surface tension provided by the wetting fluid enables the dry strap to provide a complete closure of the dry strap against the base or other element of the valve, sealing the vent.
Implementation Method 2
The textured surface may be provided on the second side of the dry strap facing the base, on the first side of the base facing the dry strap, or on both the first side of the base and the second side of the dry strap. The at least one microscopically textured surface defines a plurality of fluid-holding reservoirs therein. The wetting fluid is disposed within the plurality of the reservoirs and between the dry strap and the base entirely around the vent.
Data Source
Figure 1
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AI summary
One-way pressure relief valves (10), (10a) with wetting fluid reservoirs (15) are disclosed. Valves (10), (10a) of the types described herein may be applied to a product package, for example a package (11) containing dry roasted coffee (21), to allow gas to escape from the package (11) while preventing entry of ambient air into the package (11). A wetting fluid (17) is provided within the valve (10), (10a) to facilitate formation of the seal blocking entry of ambient air through the valve (10), (10a) and into the product package (11). The wetting fluid reservoirs 15 hold wetting fluid (17) to limit or prevent leakage of the wetting fluid (17) from the valve (10), (10a) providing benefits such as improved application of the valves (10), (10a) to the packages (11), improved retention of the valves (10), (10a) to the packages (11), and appearance improvements resulting from avoidance of leakage of wetting fluid (17) onto the valve (10), (10a) and the package (11) to which the valve (10), (10a) is attached.