Plural-Part Dry Strap Pressure Relief Valve for Coffee Packaging
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Solution Overview
Problem
Existing one-way pressure relief valves for coffee packaging face challenges in releasing gas without allowing ambient air to enter, requiring complex manufacturing processes and potential leakage issues due to the use of wetting fluids, which can affect the valve's reliability and appearance.
Innovation Solution
The development of a one-way pressure relief valve with a plural-part dry strap that can open and close at predetermined pressures, either with or without a wetting fluid, providing an air-tight seal and improved reliability, while avoiding the complexities and issues associated with traditional wetting fluid-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wetting fluid is used to seal the dry strap against the base, then an air-tight seal is achieved, but the manufacturing process becomes complex and the valve may leak or appear greasy
Solution Approach 1:
The patent removes the wetting fluid from the valve system entirely, replacing it with a dry strap mechanism that achieves sealing through mechanical friction and pressure alone. The dry strap is pressed against the base with sufficient force to create an air-tight seal without requiring any liquid sealant, thereby eliminating the complex fluid application step and potential leakage issues.
Solution Approach 2:
The patent replaces the chemical/seepage-based wetting fluid sealing mechanism with a purely mechanical sealing system. The dry strap, when pressed against the base, uses friction and normal force to create the seal, substituting the need for wetting fluids with a mechanical pressure-based sealing approach.
2Reliability
If a wetting fluid is applied between the dry strap and base, then sealing is improved, but adhesive effectiveness is reduced and appearance may be compromised
Solution Approach 1:
By completely removing the wetting fluid from the system, the patent eliminates the conflict between sealing requirements and adhesive application. The dry strap mechanism achieves sealing through mechanical means alone, allowing adhesive to be applied freely without concern for fluid interaction that would compromise bonding.
3Shape
If the valve is engineered to open at low pressures, then gas can be released before noticeable expansion, but the valve may be less sensitive to pressure changes
Solution Approach 1:
The patent engineers the dry strap mechanism with specific friction characteristics and pressure thresholds that enable it to open at low, predetermined pressures. By carefully selecting the friction coefficient, normal force, and strap geometry, the valve opens before noticeable package expansion occurs while maintaining sufficient sensitivity to pressure changes through the mechanical design parameters.
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 plural-part dry strap design enhances the valve's sensitivity to gas pressure changes, ensuring reliable operation and maintaining packaging integrity by allowing gas release without ambient air entry, thus preserving coffee flavor and appearance.
Implementation Method 1
The wetting fluid, such as a silicone oil, a graphite impregnated oil, or a food grade oil, is typically added between the dry strap and base or between the dry strap and other element and around the vent to wet the facing surface of the dry strap and base or other element facing the dry strap. 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 pressure relief valve allows high-pressure gas out of the package while preventing ambient air from entering the package and coming into contact with the coffee.
Data Source
AI summary
One-way pressure relief valves having a plural-part dry strap are disclosed. One-way pressure relief valves may be applied to a product package to evacuate gas from the package. In embodiments, the plural-part dry strap comprises overlapping dry strap parts which impart improved operation to the valve.