Fire-Resistant Mullion Sealer Using Compressible Foam
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Solution Overview
Problem
Existing sealing methods for curtain wall mullion passages, such as stuffing insulation, caulking, or expandable foams, are inadequate in effectively sealing open mullions and providing fire resistance and noise reduction.
Innovation Solution
A sealing plug made from compressible fire-retardant foam with an intumescent firestopping layer applied to one or both surfaces, designed to expand in response to fire and heat, ensuring a secure fit within the mullion passage and enhancing noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sealing methods (stuffing insulation, caulking, expandable foams) are used to seal mullion passages, then the sealing process is simple, but the fire resistance and noise reduction effectiveness are insufficient
Solution Approach 1:
The sealing plug combines compressible foam material with intumescent coating to create a composite structure that provides both mechanical sealing and fire resistance. The foam core offers compressibility and noise reduction, while the intumescent layer provides fire protection by expanding when exposed to heat, blocking smoke and flame passage.
Solution Approach 2:
The sealing plug utilizes the parameter change of the intumescent material that undergoes volumetric expansion when exposed to fire conditions. This parameter change transforms the material from a compact state during installation to an expanded state during fire exposure, automatically sealing the passage without requiring additional activation mechanisms.
2Manufacturing precision
If the sealing plug uses a fixed rigid structure, then manufacturing precision is easier to achieve, but it cannot conform to irregularities in the mullion passage
Solution Approach 1:
The sealing plug employs a foam-based flexible structure that can deform and conform to irregular geometries of the mullion passage. The compressible foam material provides the necessary flexibility to adapt to varying passage dimensions and surface irregularities while maintaining a secure seal, eliminating the need for precise custom fabrication for each installation scenario.
Solution Approach 2:
The sealing plug incorporates dynamic properties through its compressible foam construction, allowing it to adjust its shape and volume in response to installation conditions and environmental factors. This dynamic adaptability enables a single standardized plug design to effectively seal various passage configurations without requiring multiple precision-matched variants.
3Strength
If the sealing plug is made from non-compressible material, then structural strength is higher, but it cannot provide effective noise reduction and fire sealing
Solution Approach 1:
The sealing plug utilizes foam material with a porous cellular structure that provides excellent acoustic absorption properties. The porous structure traps and dissipates sound waves, effectively reducing noise transmission through the mullion passage while maintaining sufficient structural integrity for the sealing application.
Solution Approach 2:
The composite construction combines the strength-providing foam core with the fire-resistant intumescent coating, creating a multi-functional sealing plug that simultaneously achieves mechanical strength, noise reduction, and fire protection without requiring separate components for each function.
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 plug effectively seals the passage, provides fire resistance, and improves noise reduction by using a compressible foam body and intumescent foam combination that conforms to irregularities and expands to secure the seal.
Implementation Method 1
a compressible foam body and intumescent foam combination that conforms to irregularities
Implementation Method 2
The foam generally has an elasticity such that it returns to its original configuration when forces are removed therefrom
Implementation Method 3
an intumescent firestopping layer applied to one or both surfaces, designed to expand in response to fire and heat
Implementation Method 4
designed to expand in response to fire and heat
Data Source
AI summary
A sealing plug configured for sealing a passage of a curtain wall mullion. The passage has a maximum width and a length. The sealing plug includes a main body extending from a first surface to a second surface. The main body has a width at least as large as the passage maximum width and a length at least as large as the passage length. The main body is manufactured from a compressible foam. An intumescent layer is defined along at least one of the first and second surfaces.