Sealing Tape Cross-Section Profile for Rain Tightness
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Solution Overview
Problem
Existing sealing tapes for joints face challenges in achieving both improved impermeability to driving rain and a gradient in water vapor diffusion resistance while being cost-effective, as they often require additional coatings or materials that can be costly and prone to damage.
Innovation Solution
A sealing tape with a cross-sectional profile featuring elevations and depressions arranged inversely on both sides of the central plane, modulating compression and density gradients to enhance impermeability and water vapor diffusion resistance without the need for additional coatings or materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional coatings or films are applied to the narrow side to improve driving rain tightness, then impermeability to driving rain is improved, but manufacturing cost increases and reliability decreases due to potential damage
Solution Approach 1:
The sealing tape incorporates a raised portion on the narrow side that creates a local structural feature. This raised portion ensures that the narrow side maintains contact with the joint surface even when compressed, providing driving rain tightness through the foam material's inherent properties rather than through additional coatings. The local structural modification eliminates the need for separate protective layers while maintaining the required impermeability.
2Object-affected harmful factors
If additional coatings or films are applied to the narrow side to improve driving rain tightness, then impermeability to driving rain is improved, but manufacturing cost increases
Solution Approach 1:
The invention merges the driving rain tightness function with the base foam material by creating a raised portion through extrusion. This integrates the protective function into the single-component foam structure, eliminating the need for separate coating or film materials and the additional manufacturing steps required to apply them, thereby reducing overall manufacturing cost.
Solution Approach 2:
The raised portion on the narrow side enables the sealing tape to achieve driving rain tightness through its own structural configuration rather than requiring external protective layers. The foam material's inherent properties, combined with the raised portion geometry, provide the necessary impermeability without needing additional materials or complex manufacturing processes.
3Object-affected harmful factors
If a coating or film is applied to the narrow side to improve driving rain tightness, then impermeability is improved, but water vapor diffusion properties are strongly influenced
Solution Approach 1:
The raised portion creates a localized structural feature that maintains narrow side contact for driving rain protection while leaving the rest of the foam material's porous structure intact. This local modification preserves the foam's natural water vapor diffusion properties in the bulk material, allowing the sealing tape to maintain both driving rain tightness and appropriate vapor permeability without the need for surface coatings that would interfere with diffusion.
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 achieves improved impermeability to driving rain and a sufficient gradient in water vapor diffusion resistance across the sealing tape, ensuring the joint is tighter on the inside than outside while being cost-effective and durable.
Implementation Method 1
the sealing tape arranged and set back in the joint results in a greater density of the foam material in the height area than in the depth area
Implementation Method 2
the sealing tape also has different areas with different water vapor diffusion resistance
Data Source
Figure 1~2
Figure 3~4
AI summary
The sealing band (1) has an elongated foam body and opposite broad sides (3,4) that is placed on fusion faces and opposite narrow sides (5,6) arranged between the broad sides. A cross-section profiling (7) is provided on one of the broad sides. An elevated area (8) and a deep area (9) are arranged on two sides of a central plane of the sealing band such that the foam material produces a stronger sealing in the elevated area than in the deep area. The sealing band is structured in the elevated area or in the deep area, when an elevation or a depth is formed in the cross section.