Baffle Carrier Fixation Mechanism for Foam Containment in Cavities
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Solution Overview
Problem
Existing baffles or reinforcers fail to correctly seal cavities, prevent foam contamination of trim holes, and contain excessive foam expansion, leading to incomplete sealing and foam escape during the injection of foamable bulk materials in automotive or aerospace applications.
Innovation Solution
A baffle or reinforcer with a rigid carrier and a fixation mechanism that includes an anti-return device to prevent expandable material from escaping, allowing for precise sealing and containment within the cavity, eliminating the need for separate holes for support and filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bulk material is injected into large sections, then the cavity can be filled, but the material flows without support causing incomplete sealing and foam escape
Solution Approach 1:
The patent introduces a carrier with multiple compartments or sections that divide the large cavity into smaller contained areas. This segmentation prevents the bulk material from flowing uncontrollably across large unsupported distances, ensuring each section is properly sealed while containing the expandable material within defined boundaries.
Solution Approach 2:
The carrier acts as an intermediary structure between the injectable bulk material and the cavity walls. It provides a supported framework that guides and contains the expandable material during injection and expansion, preventing direct uncontrolled flow and ensuring complete sealing of the cavity sections.
2Ease of operation
If trim holes are placed in large sections, then access is provided, but excessive foam material fills the trim holes causing contamination
Solution Approach 1:
By dividing the cavity into smaller sections with the carrier structure, trim holes can be strategically placed in specific segments without exposing them to excessive foam flow. Each segmented area controls foam expansion locally, preventing contamination of trim holes while maintaining accessibility.
Solution Approach 2:
The carrier structure is pre-positioned in the cavity before foam injection, creating predetermined pathways and containment zones. This preliminary arrangement ensures that when foam is injected, it follows controlled paths away from trim holes, preventing contamination while maintaining hole accessibility.
3Ease of manufacture
If foam is injected without containment structure, then injection is simple, but significant foam escapes from the introduction hole
Solution Approach 1:
The carrier serves as an intermediary containment structure that is easily integrated into the injection process. It provides immediate confinement for the foam as it is injected through the introduction hole, preventing escape while requiring minimal modification to the existing simple injection procedure.
Solution Approach 2:
The carrier incorporates flexible or expandable elements that conform to the foam expansion, creating an adaptive containment system. This flexible structure maintains containment effectiveness throughout the injection and expansion process while adding minimal complexity to the overall system.
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 effectively seals cavities, prevents foam contamination of trim holes, and contains foam expansion, ensuring complete filling and structural integrity without excessive foam escape, enhancing the sealing and reinforcement capabilities.
Implementation Method 1
the baffle material expands to seal the cavity and or bond the carrier to the member. Alternatively, a foamable bulk material is injected in the cavity after painting and fills the cavity as it expands.
Implementation Method 2
a foamable bulk material is injected in the cavity after painting and fills the cavity as it expands
Data Source
AI summary
A baffle or reinforcer includes a carrier configured to be disposed in a cavity and a fixation mechanism disposed on the carrier and configured to at least partially support the carrier in the cavity. The fixation mechanism defines an opening for receiving an expandable material. The fixation mechanism has an anti-return device configured to prevent at least a portion of the expandable material from escaping through the opening during expansion. A method includes inserting the carrier into the cavity, injecting the expandable material into the cavity via the opening in the fixation mechanism, expanding the expandable material within the cavity, and preventing at least a portion of the expandable material from escaping through the opening during expansion.