Mullion Seal for Sound Flanking Path Blockage
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Solution Overview
Problem
Unsealed interfaces between interior separations and exterior mullions in curtain wall and storefront constructions create 'flanking paths' for air-borne sound, compromising acoustic integrity and privacy by allowing noise to invade through these paths, despite the acoustic attenuation qualities of the separation structures.
Innovation Solution
An acoustic seal is provided, configured as an elongated rail with a base rail and side rail portion, featuring planar and non-parallel surfaces to engage the mullion and end wall, forming an inside seal corner to envelop the mullion's outside corner, and utilizing adhesive and flexible materials to accommodate movement and provide effective sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unsealed interfaces are used between interior separations and mullions, then the construction is simpler and cost-effective, but sound transmission through flanking paths compromises acoustic integrity
Solution Approach 1:
An acoustic seal assembly acts as an intermediary component between the interior separation and the mullion. The seal body with adhesive layers mediates the connection, providing both mechanical attachment and acoustic sealing functions, thereby eliminating sound transmission through the interface while maintaining construction simplicity.
Solution Approach 2:
The acoustic seal assembly uses composite construction combining a seal body material (such as foam or elastomer) with adhesive layers. This composite structure provides both the flexibility needed for accommodation of movement and the bonding strength for secure attachment, while the material composition is selected to provide acoustic attenuation properties.
2Object-affected harmful factors
If rigid sealing is used at the mullion interface, then acoustic sealing is effective, but the seal cannot accommodate relative movement between components
Solution Approach 1:
The seal body is constructed from flexible material such as foam or elastomer that can deform and accommodate relative movement between the interior separation and the mullion. This flexible construction maintains continuous acoustic sealing even when components move relative to each other, preventing sound transmission while adapting to dimensional changes.
Solution Approach 2:
The acoustic seal assembly is designed with dynamic characteristics, allowing it to flex and deform in response to relative movement between connected components. The adhesive layers provide bonding while the seal body material allows for dynamic adjustment, maintaining acoustic integrity under varying conditions of movement and stress.
3Ease of operation
If a simple seal configuration is used, then installation is easier, but the seal cannot effectively envelop the mullion corner to block flanking paths
Solution Approach 1:
The acoustic seal assembly is segmented into distinct functional portions: a seal body portion for acoustic sealing and adhesive layers for attachment. This segmentation allows the seal to be installed by simply attaching the adhesive-backed seal body to the mullion and interior separation, creating an L-shaped configuration that envelops the corner while maintaining ease of installation.
Solution Approach 2:
The seal body is configured with curved or angled surfaces that conform to the mullion corner geometry. This curved configuration allows the seal to envelop the outside corner of the mullion effectively, blocking sound flanking paths along both faces of the mullion while maintaining a simple single-piece installation component.
Data Source
AI summary
An acoustic seal for a sound flanking path between an interior architectural separation and a mullion. A seal body is configured as an elongated rail having a base rail portion and a side rail portion. The base rail portion has sides defining a first seal surface for engaging a first interior side of the mullion, and a second seal surface for engaging an end wall of the architectural separation. The side rail portion has sides defining a third seal surface substantially non-parallel with respect to the first seal surface for engaging a second interior side of the mullion, and a fourth seal surface in substantially coplanar relationship with the second seal surface for engaging the end wall of the architectural separation. The first and third seal surfaces may form an inside seal corner for enveloping an outside corner of the mullion defined by the mullion's first and second interior sides.