Foam Sealing Tape With Humidity-Responsive Vapor Barrier
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Solution Overview
Problem
Conventional sealing tapes fail to adequately prevent moisture accumulation at low outside temperatures while maintaining sufficient water vapor permeability, leading to potential condensation and structural damage.
Innovation Solution
A foam sealing tape with a barrier layer made of a material whose water vapor diffusion resistance (WDP) reversibly changes with air humidity, allowing controlled water vapor diffusion based on humidity levels, preventing moisture accumulation and ensuring effective moisture removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the barrier layer has a comparatively low water vapor permeability, then moisture accumulation is prevented, but water vapor removal capability is insufficient
Solution Approach 1:
The barrier layer's water vapor diffusion resistance is made dynamically adjustable through humidity-responsive materials. When humidity increases, the material's resistance decreases to facilitate vapor removal; when humidity decreases, resistance increases to prevent condensation. This dynamic property resolves the contradiction between preventing moisture accumulation and enabling water vapor removal.
Solution Approach 2:
The invention changes the physical parameter of water vapor diffusion resistance based on environmental conditions. By using materials whose resistance parameter varies with humidity, the system adapts to different conditions, allowing high resistance during dry periods (preventing condensation) and low resistance during humid periods (enabling vapor removal).
2Productivity
If the barrier layer has a comparatively high water vapor permeability, then water vapor can pass through easily, but condensation risk increases at low temperatures
Solution Approach 1:
The barrier layer dynamically adjusts its permeability in response to humidity changes. At low temperatures with low humidity, the material maintains high resistance to prevent condensation. When humidity rises, the resistance decreases automatically, allowing vapor to pass through without forming condensation, thus resolving the contradiction between permeability and condensation risk.
Solution Approach 2:
The barrier layer material provides inherent feedback by sensing humidity levels and automatically adjusting its diffusion resistance. High humidity triggers reduced resistance to allow vapor escape, while low humidity maintains high resistance to prevent condensation, creating a self-regulating system that prevents harmful condensation while maintaining necessary permeability.
3Device complexity
If a conventional barrier layer is used, then结构简单 (structure is simple), but it cannot adapt to varying humidity conditions
Solution Approach 1:
Instead of complicating the structure, the invention changes the material parameter of the barrier layer to be humidity-responsive. This allows the single-layer structure to adapt to varying humidity conditions through parameter changes rather than structural complexity, maintaining simplicity while achieving adaptability.
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 sealing tape effectively manages moisture accumulation and removal across varying humidity conditions, preventing condensation and structural damage by adjusting WDP according to air humidity, ensuring reliable moisture dissipation.
Implementation Method 1
the sealing tape is further designed to be permeable to water vapor diffusion from one of the narrow sides to the other, forming a water vapor diffusion path
Implementation Method 2
the barrier layer consists at least partially of a material whose water vapor diffusion resistance (WDP) reversibly changes with the air humidity
Data Source
Figure 1a~3b
Figure 4~6c
Figure 7~8c
AI summary
The invention relates to a foam sealing tape, for example for sealing between two construction parts, in particular between a frame component and the masonry associated with the frame component, wherein the sealing tape has opposite broad sides that can be associated with the construction parts and narrow sides extending perpendicularly to the broad sides and is permeable to water vapor diffusion from one of the narrow sides to the other narrow side and wherein furthermore the sealing tape has a barrier layer made of a material that is different from the foam sealing tape material and that extends at least partially across the cross-section of the water vapor diffusion path. The barrier layer is made at least partially of a material that reversibly changes the resistance of said material to water vapor diffusion with the humidity.