Semipermeable Foam Envelope for Large-Gap Sealing
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Solution Overview
Problem
Existing foam sealing systems for large volumes or gaps are inefficient in terms of installation time and raw material waste, particularly when sealing small cavities like those between a window and a wall.
Innovation Solution
A tube-like envelope with a semipermeable outer layer and integrated inlet ports is used to contain and direct foamable components, allowing controlled expansion to seal gaps, reducing waste and installation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If foamable components are delivered in bulk by an external device, then large volumes can be sealed, but installation time increases and raw material waste increases
Solution Approach 1:
The foamable composition is divided into multiple compartments (first compartment with polyol, second compartment with polyisocyanate) within the envelope, allowing controlled dispensing of each component separately into the gap rather than delivering bulk foam, thereby reducing installation time and material waste
Solution Approach 2:
The envelope is pre-filled with foamable components in separate compartments before installation, and the components are mixed and expanded in situ within the gap, eliminating the need for external bulk delivery equipment and reducing installation time
2Quantity of substance
If foamable components are delivered in bulk by an external device, then large volumes can be sealed, but raw material waste increases
Solution Approach 1:
The envelope contains separate compartments for polyol and polyisocyanate components, allowing precise dosing and controlled expansion only within the target gap, preventing overflow and material waste associated with bulk foam delivery
Solution Approach 2:
The foamable components are positioned and expanded locally within the specific gap to be sealed, rather than delivering foam bulk that may exceed the required volume, ensuring material is used efficiently and minimally
3Reliability
If multiple compartments are used to deliver foam components, then separation of components is achieved, but device complexity increases
Solution Approach 1:
Multiple compartments containing different foamable components are nested within the single envelope structure, maintaining component separation while integrating them into one installable unit, thus avoiding the complexity of multiple separate delivery devices
4Reliability
If the envelope expands to fill large gaps, then sealing effectiveness is improved, but control over foam expansion direction is reduced
Solution Approach 1:
The envelope is designed with specific geometric features (flared end, tapered section) that create localized expansion zones, directing foam expansion preferentially in certain directions to fill the gap effectively while maintaining overall sealing reliability
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 system effectively seals gaps by minimizing waste and reducing installation time, providing an airtight and waterproof seal with controlled foam expansion.
Implementation Method 1
the tube comprises a tube wall having an outer layer of a semipermeable membrane that is permeable to vapors but impermeable to liquids
Implementation Method 2
The interior is configured to receive a foaming composition. The envelope is configured such that the foaming composition expands the envelope such as to fill a large gap
Data Source
AI summary
An article comprises a tube having peripheral areas, including an upper section, a lower section, an inner section, and an outer section, the tube further comprising a tube wall having an outer layer of a semipermeable membrane that is permeable to vapors but impermeable to liquids, and the tube further comprising at least one inlet port integrated into the tube wall to permit the flow of an activated or activatable foamable composition into the tube interior, wherein the tube further has a plurality of holes that penetrate through the outer layer of the tube to allow expanding foam to both fill the interior of the tube and exit the tube and fill a space exterior to the tube.