Packaging Pressure Relief Valve with Adhesive Bonding
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Solution Overview
Problem
Existing pressure relief valves for packaging containers are large, complex to produce, and typically mounted on the front face, which is undesirable for presentation and printing, and can be prone to leaks due to wrinkling during adhesive application.
Innovation Solution
A pressure relief valve with a base plate, membrane, and intermediate layer, where the membrane has an adhesive coating for bonding to the intermediate layer and base plate, allowing for reduced dimensions, flexible placement, and adjustable opening pressure without changing the valve's dimensions, using a ratio of surface areas to ensure reliable sealing and opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pressure relief valve is mounted on the front face of the packaging container, then the valve is easily accessible and visible, but it restricts the presentation surface and printing area
Solution Approach 1:
The patent moves the pressure relief valve from the traditional front face location to alternative positions such as the back face, side faces, or top/bottom surfaces of the packaging container. This spatial relocation resolves the contradiction by maintaining valve accessibility while preserving the front face for presentation and printing purposes.
2Strength
If the membrane is completely wetted with adhesive and affixed to the base plate, then strong bonding is achieved, but wrinkling occurs and the valve becomes non-leak-proof
Solution Approach 1:
The patent divides the bonding process into two separate stages: first bonding the membrane to the intermediate layer, then bonding the intermediate layer to the base plate. This segmentation prevents wrinkling by distributing the adhesive application across separate bonding operations, maintaining both bonding strength and leak-proof reliability.
Solution Approach 2:
The patent introduces an intermediate layer between the membrane and the base plate. This intermediate layer serves as a mediator that facilitates reliable bonding while preventing direct contact between the membrane and base plate that would cause wrinkling, thereby ensuring both strong bonding and leak-proof performance.
3Reliability
If the pressure relief valve is designed with larger dimensions, then it provides sufficient opening pressure and reliable sealing, but it increases material usage and manufacturing complexity
Solution Approach 1:
The patent segments the pressure relief valve into three distinct components: membrane, intermediate layer, and base plate. This segmentation simplifies manufacturing by allowing each component to be produced and bonded separately, reducing overall manufacturing complexity while maintaining reliable sealing and opening functionality.
Solution Approach 2:
The intermediate layer acts as a mediator that enables reliable sealing and opening pressure characteristics without requiring larger valve dimensions. By controlling the thickness and properties of the intermediate layer, the patent achieves the necessary mechanical performance with a compact overall structure, reducing manufacturing complexity.
4Loss of substance
If the valve dimensions are reduced, then material savings are achieved and placement flexibility increases, but manufacturing precision requirements increase
Solution Approach 1:
The segmented three-component structure allows for reduced overall valve dimensions while maintaining manufacturing precision. Each component can be manufactured with standard precision, and the bonding processes are simplified by the modular design, offsetting the increased precision requirements that would normally accompany miniaturization.
Solution Approach 2:
The intermediate layer serves as a tolerance-absorbing intermediary that reduces the impact of bonding precision variations. By providing a buffer zone between the membrane and base plate, it allows for successful assembly even with moderate precision variations, enabling compact dimensions without excessive precision requirements.
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 a compact, cost-effective, and leak-proof pressure relief valve that can be placed anywhere on the container, ensuring reliable opening and sealing across various pressure ranges, meeting industry requirements and allowing for modular construction and efficient manufacturing.
Implementation Method 1
The membrane comprises one side, on which an adhesive coating has been completely applied, and the intermediate layer is bonded to the membrane by means of the adhesive coating
Implementation Method 2
the intermediate layer is bonded to the membrane by means of the adhesive coating such that said membrane comprises two parallel peripheral zones for fastening on the base plate
Implementation Method 3
provides an outlet channel through the valve opening when a positive pressure exists in the interior of the packaging container
Data Source
AI summary
A pressure relief valve (2) for a packaging container (1) includes a base plate (3), which can be fastened on a wall of the packaging container and has a valve opening (9). The valve (2) also includes a membrane (4) which is arranged on the base plate (3) over the valve opening (9), wherein the membrane (4) has an adhesive on one side. The valve (2) also includes an intermediate layer (6), which is adhesively bonded to the adhesive-containing side of the membrane such that the membrane (4) has two remaining, parallel adhesive-containing peripheral zones for fastening on the base plate (3). The membrane (4) is arranged on the base plate by way of the intermediate layer (6) such that a channel zone (14) is formed on the base plate (3). The channel zone covers over the valve opening (9) and rests right up against the base plate in the closed position.