Recyclable Polymeric Valve Closure for Beer Kegs
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Solution Overview
Problem
Traditional valve closures for beer kegs are expensive and difficult to recycle, as they are typically made of metal and require labor-intensive disassembly for single-use applications, which contradicts the growing trend of minimizing environmental impact through recyclable materials.
Innovation Solution
A valve closure composed of polymeric materials, featuring a spring element with interconnected C-shaped sections arranged in stacks to provide resilient deformation and effective sealing, allowing the entire closure to be recycled without disassembly, with a dip tube assembly and valve member design for efficient gas and liquid flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metal valve closures are used, then reliable sealing functions and long working life are achieved, but cost increases and recycling becomes labor-intensive
Solution Approach 1:
The patent combines multiple valve closure components (housing, spring element, valve members, dip tube assembly) into a single integrated unit made entirely of polymeric materials. This merging allows the entire assembly to be recycled together without labor-intensive disassembly, while maintaining reliable sealing functions through the coordinated design of the valve members and seats.
Solution Approach 2:
The patent uses homogeneous polymeric materials for all valve closure components instead of traditional metal constructions. This material uniformity enables the entire valve closure to be processed together in recycling facilities, eliminating the need for separation and reducing labor requirements while maintaining functional performance.
2Object-affected harmful factors
If single-use beer kegs are used, then environmental impact of transporting heavy kegs is reduced, but labor-intensive stripping for recycling increases
Solution Approach 1:
The valve closure components are merged into a single recyclable unit that can be removed and processed together with the keg. This integration maintains the single-use keg model's environmental benefits while eliminating the labor-intensive stripping process by allowing the entire valve closure assembly to be recycled as one unit.
3Ease of manufacture
If polymeric materials are used for spring element, then recyclability without component separation is achieved, but compressive strength and stability may be reduced
Solution Approach 1:
The spring element is segmented into multiple interconnected C-shaped sections that work together to provide the necessary compressive strength and stability. This segmentation allows the polymeric spring to achieve adequate mechanical performance while maintaining the ability to be recycled with other polymeric components without separation.
Solution Approach 2:
The spring element uses a composite structure with interconnected C-shaped sections that distribute and share mechanical loads. This composite design compensates for the lower inherent strength of polymeric materials compared to metals, providing sufficient compressive strength for valve operation while maintaining recyclability.
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 cost-effective, recyclable valve closure that maintains reliable sealing performance and extends the compressive range of the spring element, reducing the risk of creep and enhancing strength, while allowing for efficient recycling without component separation.
Implementation Method 1
a spring element moulded from a resilient polymeric material and comprising a plurality of interconnected sections arranged such that movement of the valve member by the valve-operating member causes resilient deformation of the interconnected sections
Data Source
AI summary
A fully recyclable valve housing for engagement with a neck of a container, such as a beer keg, has an inner port for liquid and a concentric outer port for pressurized gas, with openings for admitting pressurized gas into the container. A dip tube is connected to a bottom end fitting, communicating with a valve stem within the valve housing. A valve member controls flow through the concentric ports, and a spring element located about the valve stem urges the valve member upwards to close the ports. The spring element is molded from a resilient polymeric material and comprises a plurality of C-shaped sections angularly arranged in two interconnected stacks on opposite sides of the valve stem such that movement of the valve member causes concurrent resilient deformation of all the sections.