Pressurized Can Membrane Sealing for Two-Component Dispensing
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Solution Overview
Problem
Existing pressurized cans for two-component systems face issues with leakage and material compatibility, particularly with solvents like esters, cetons, and aromatics, leading to packaging challenges and increased production complexity and costs.
Innovation Solution
The design incorporates a membrane that hermetically seals the inner casing at the can-side end, eliminating the need for separate sealing elements, and uses a spring cage to secure the inner casing to the cup, ensuring a tight seal and facilitating easy manufacturing with materials like aluminum or polypropylene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing elements like O-seals are used in pressurized cans for two-component systems, then the can can be sealed, but leakage occurs and material compatibility problems arise with solvents like esters, ketones, and aromatics
Solution Approach 1:
The patent employs a flexible membrane made of aluminum foil or plastic that hermetically seals the inner casing. This membrane is integrated directly into the can wall structure, eliminating the need for conventional O-seals and gaskets that are incompatible with solvents. The membrane provides a reliable barrier against leakage while being chemically resistant to esters, ketones, and aromatics used in two-component formulations.
Solution Approach 2:
The sealing function is merged directly into the can wall structure through the membrane integration. The membrane is formed as an integral part of the can wall or securely attached to it, combining the structural and sealing functions into a single unified system, thereby eliminating separate sealing elements that cause compatibility issues.
2Reliability
If separate sealing elements are used in pressurized cans, then sealing can be achieved, but the manufacturing becomes more complex and costly
Solution Approach 1:
The sealing function is merged directly into the can wall structure through the membrane integration. The membrane is formed as an integral part of the can wall or securely attached to it, combining the structural and sealing functions into a single unified system, thereby eliminating separate sealing elements that cause compatibility issues.
Solution Approach 2:
The membrane serves multiple functions simultaneously: it acts as a structural component of the can wall, provides hermetic sealing, and offers chemical resistance. This multi-functionality simplifies the overall design and manufacturing process by eliminating the need for separate sealing elements.
3Ease of operation
If conventional covers are used in inner casings, then the inner casing can be closed, but component migration occurs during storage especially at high temperatures and long storage times
Solution Approach 1:
The membrane made of aluminum foil or plastic provides a hermetic seal that prevents component migration during storage. This flexible film structure maintains its sealing integrity under high temperatures and long storage times, preventing the migration of polyisocyanate and other components into the sealing system.
4Ease of manufacture
If plastic materials like polypropylene are used for inner casings, then manufacturing is easier, but the materials are permeable to propellant components and provide inadequate resistance to solvents
Solution Approach 1:
The patent uses composite construction where the inner casing is made of plastic (easy to manufacture) but is lined or coated with aluminum foil or plastic membrane (high resistance). This composite structure combines the manufacturing advantages of plastic with the chemical resistance and propellant impermeability of metal foil or specialized plastics.
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
This solution provides a reliable, cost-effective, and leak-proof packaging system for two-component formulations, preventing component migration and improving storage stability and dispensing efficiency.
Implementation Method 1
a spring-loaded trigger which acts on the push rod
Implementation Method 2
the liquid propellant that serves to dispense the component
Implementation Method 3
the second component reacts with the main component to form the finished product
Data Source
AI summary
Pressurized can comprising a body (2), a dome (3) accommodating a valve (4), a concavely shaped bottom (5), an inner casing (7) attached to a cup (6), a push rod (9) arranged in the inner casing (7), said push rod (9) being actuated through the cup (6) and intended to force open the inner casing (7), with said inner casing (7) being joined to the cup (6) via a spring cage (11), said spring cage (11) containing a spring-loaded trigger (12) which acts on the push rod (9) which, in turn, acts on a cover (8) arranged at the can-side end of the inner casing (7), said cover (8) being a membrane which seals the inner casing (7) at its can-side end hermetically against the contents of the pressurized can (1) and which is torn open by the push rod (9) when the trigger (12) is actuated.