Stacked Inflatable Tube Assembly for Weldable Evacuation Slides
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Solution Overview
Problem
Current methods for joining inflatable evacuation slide tubes are labor-intensive and lack effective inspection, leading to potential defects due to manual adhesive bonding and the inability to heat seal or RF weld due to aluminum coatings, which obstruct visibility and detection of bonding issues.
Innovation Solution
A method involving seam tapes bonded along folds and circumferential ends of inflatable tube panels, allowing for radio frequency welding or heat bonding, while ensuring fluid sealing and redundancy between stacked tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If manual adhesive bonding and V-tape application are used to join top tube and bottom tube, then the tubes can be connected, but the manufacturing process becomes labor intensive and time consuming
Solution Approach 1:
The patent replaces manual adhesive bonding and V-tape application with heat sealing and radio frequency (RF) welding. This substitution automates the joining process, eliminating labor-intensive manual operations while maintaining strong bonds between the top and bottom tubes. The heat sealing and RF welding processes provide consistent, reliable joints without requiring manual dexterity or multiple steps.
Solution Approach 2:
The patent changes the bonding method from chemical adhesive bonding to thermal bonding (heat sealing and RF welding). This parameter change allows for faster processing speeds and automated manufacturing while achieving equivalent or superior bond strength. The thermal processes can be precisely controlled and executed rapidly, dramatically improving manufacturing productivity.
2Reliability
If aluminum coating is applied to the fabric on the outer surface of tubes for flame retardance, then flame resistance is improved, but heat sealing and RF welding become impossible
Solution Approach 1:
The patent divides the tube structure into distinct panels with different surface treatments. The exterior surfaces receive aluminum coating for flame retardance, while the interior bonding surfaces are kept free of aluminum coating to enable heat sealing and RF welding. This segmentation allows each surface to have the appropriate properties for its function: fire resistance on the outside, weldability on the inside bonding surfaces.
Solution Approach 2:
The patent applies different properties to different locations of the tube structure. The outer surfaces have aluminum coating for flame resistance, while the inner bonding surfaces have no aluminum coating to allow heat sealing and RF welding. This local differentiation of material properties resolves the contradiction by providing flame retardance where needed while maintaining weldability where bonding occurs.
3Strength
If V-tape is coupled between top tube and bottom tube to strengthen bonding, then bond strength is improved, but inspection of the adhesive bond becomes blocked and difficult
Solution Approach 1:
The patent replaces the V-tape reinforcement system with direct heat sealing and RF welding. This substitution eliminates the need for V-tape, which was blocking inspection. The thermal bonding methods create visible, inspectable bonds without requiring additional reinforcing tapes that obstruct viewing and detection of bond quality.
Solution Approach 2:
The patent removes the V-tape element from the bonding system. By extracting the V-tape component that was providing mechanical reinforcement, the patent eliminates the obstruction to bond inspection. The bonding strength is maintained through heat sealing and RF welding, which do not require the V-tape overlay that blocked visual and tactile inspection.
4Strength
If adhesive bonding is used to join tubes, then the tubes can be connected, but defects such as channels, wrinkles, and non-bonded areas cannot be detected
Solution Approach 1:
The patent replaces adhesive bonding with heat sealing and RF welding, which create bonds that are visually inspectable and detectable. These thermal bonding methods produce continuous, uniform bonds without the hidden defects that plague adhesive applications. The bonding process and resulting joints can be easily inspected for quality, allowing immediate detection of any bonding issues.
Solution Approach 2:
The patent utilizes visual changes during the heat sealing and RF welding process to indicate bond quality. The thermal bonding processes create visible markers, color changes, or physical indicators that show where bonding has occurred and whether it is complete and defect-free. This visual feedback enables real-time inspection and detection of bonding issues.
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
Facilitates efficient and reliable assembly of stacked inflatable tubes with improved manufacturing speed and defect detection, enabling independent support and redundancy in evacuation systems.
Implementation Method 1
allowing for radio frequency welding or heat bonding
Implementation Method 2
allowing for radio frequency welding or heat bonding
Implementation Method 3
the aluminum coating applied to the fabric on the outer surface of tubes for flame retardance
Implementation Method 4
a first seam tape bonded to a first top tube interior surface portion of the first panel and a second top tube interior surface portion of the second panel
Data Source
AI summary
An inflatable stacked tube assembly may comprise a first panel and a second panel. The first panel may form a first portion of a top tube and a first portion of a bottom tube. The second panel may form a second portion of the top tube and a second portion of the bottom tube. A first seam tape may be bonded to a first top tube interior surface portion of the first panel and a second top tube interior surface portion of the second panel. The first seam tape may be located along a first fold formed by the first panel and along a second fold formed by the second panel.