Die-cut Expandable Sealing Body for Cavity Filling
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Solution Overview
Problem
Existing expandable materials used in the transportation industry for baffling, reinforcement, and sealing often fail to fill corners or small cracks within cavities effectively, leading to increased thickness and cost, and uncontrolled expansion.
Innovation Solution
A method involving a die-cut expandable material with cut-out portions that allow the free ends to extend into cavities, enabling effective sealing and baffling without adding thickness, using a substantially planar sealing body with fasteners for attachment to cavity walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of expandable material is increased to fill corners and cracks, then sealing effectiveness is improved, but cost increases and expansion control is reduced
Solution Approach 1:
The expandable material is segmented into multiple layers with cut-out portions, creating a multi-layered structure where each layer can independently expand and fill specific cavity regions. This segmentation allows thin individual layers to collectively achieve complete corner and crack filling without requiring increased overall thickness
Solution Approach 2:
The invention transitions from a single-plane thick material to a multi-layered configuration with cut-outs that create three-dimensional expansion pathways. The cut-out portions allow material to expand into corners and cracks by utilizing the vertical stacking dimension and lateral extension through cut-outs, rather than relying solely on increased thickness in a single direction
2Reliability
If the thickness of expandable material is increased to fill corners and cracks, then sealing effectiveness is improved, but cost increases
Solution Approach 1:
Dividing the material into multiple thin layers with cut-outs reduces the total quantity of expensive expandable material required, while the layered structure with strategic cut-outs ensures complete coverage of corners and cracks, maintaining sealing effectiveness at lower cost
Solution Approach 2:
The invention changes the structural parameters of the material from a single thick layer to multiple thin layers with specific cut-out patterns. This parameter change optimizes the balance between sealing performance and material cost by using less total material while achieving better expansion control into critical areas
3Manufacturing precision
If the thickness of expandable material is increased to overload space adjacent to hard to reach cavity, then material is forced into corners during expansion, but blocked openings and uncontrolled expansion occur
Solution Approach 1:
The multi-layer structure with cut-outs segments the expansion process into controlled stages, allowing material to expand systematically into corners and cracks through the cut-out pathways rather than creating uncontrolled pressure that blocks openings or causes uneven expansion
Solution Approach 2:
The cut-out portions act as intermediaries that guide and control the expansion of the material into difficult-to-reach areas. These cut-outs provide predetermined pathways that direct material flow into corners and cracks, preventing blocked openings and ensuring uniform expansion throughout the cavity
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
This approach allows for lightweight, efficient sealing and baffling of cavities, filling corners and gaps without additional material thickness, ensuring controlled expansion and reduced costs.
Implementation Method 1
The first expandable material layer 12 and any additional expandable material layers may be exposed to heat or moisture and will expand
Implementation Method 2
The first expandable material layer 12 and any additional expandable material layers may be exposed to heat or moisture and will expand
Data Source
AI summary
A method for reinforcing, baffling or sealing a vehicle structure by providing a die-cut expandable material that enters and seals a cavity or multiple cavities and corners, cracks, or seams.