Non-Flat Base Body Pressure Relief Valve for Packaging
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Solution Overview
Problem
Existing pressure relief valves for packaging containers require higher opening pressures to effectively release gases, which can lead to external air infiltration due to strong adhesion forces between the valve membrane and the base body.
Innovation Solution
The pressure relief valve features a non-flat base body design with a recessed area and rim-like raised areas around through holes, reducing adhesion forces and allowing the valve membrane to lift easily at lower pressures, while external atmospheric pressure helps seal the valve against external air ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base body has a flat contact surface with the valve membrane, then a strong seal is achieved, but the opening pressure becomes too high
Solution Approach 1:
The base body is designed with non-uniform surface geometry: a flat outer region for strong sealing contact with the valve membrane, and a recessed inner region that reduces adhesion forces. This local differentiation allows the seal area to maintain high contact pressure while the opening area experiences reduced adhesion, enabling the valve to open at lower pressures while maintaining reliable sealing.
2Object-affected harmful factors
If the valve membrane is held firmly against the base body, then external air is prevented from entering, but gases generated inside cannot escape at low pressures
Solution Approach 1:
The base body features a recessed region that creates localized reduced adhesion forces, allowing the valve membrane to be held firmly at the seal perimeter while remaining easily liftable at the opening region. This enables the valve to maintain strong sealing against external air ingress while allowing gases to escape efficiently at low internal pressures through the recessed area.
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 enables gas release at relatively low excess pressures (e.g., 5 mbar) while maintaining a strong seal, preventing external air from entering the package and ensuring effective gas escape without valve membrane displacement.
Implementation Method 1
the flat contact of the valve membrane against the base body permits the sealant in the form of silicone oil between the base body and the valve membrane to provide relatively powerful adhesion forces between the valve membrane and the base body
Implementation Method 2
the atmospheric pressure that acts on the valve from the outside presses the valve membrane against the raised area in the region of the at least one through hole, thus closing the through hole
Data Source
AI summary
The invention relates to a pressure relief valve, comprising a base body, which is covered by a valve membrane. The base body which is located on the inner face of a packaging container, permits the escape of excess pressure from the packaging container into the atmosphere by means of passages and perforations that are configured in the wall of the packaging material. The inventive pressure relief valve thus responds particularly well. i.e. allowing particularly low opening pressures, by means of the special configuration of its base area.