Stacked Inflatable Tubes With Inspectable Heat-Sealed Joints
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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 radio frequency weld due to aluminum coatings, which obstructs visual inspection.
Innovation Solution
A method involving seam tapes bonded to interior surfaces of inflatable tube panels, allowing for radio frequency welding or heat bonding, and forming specific folds and seams to create a sealed and inspectable joint between top and bottom tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
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 automated heat sealing and radio frequency (RF) welding processes. The heat sealing process uses heating elements to fuse the fabric layers together, while RF welding uses electromagnetic energy to rapidly join the tubes. This substitution of mechanical/manual processes with automated thermal and electromagnetic processes significantly reduces labor intensity and manufacturing time.
Solution Approach 2:
The patent changes the bonding parameters by using controlled heat application through heat sealing and RF welding. By adjusting temperature, pressure, and duration parameters of the heat sealing process, and frequency and power parameters of RF welding, the manufacturing process achieves reliable tube joining with much faster cycle times compared to manual adhesive bonding.
2Reliability
If aluminum coating is applied to fabric outer surface for flame retardance, then flame resistance is improved, but heat sealing and RF welding cannot be performed
Solution Approach 1:
The patent segments the fabric structure into multiple layers with different functional properties. The outer surface retains aluminum coating for flame retardance, while the inner surface or intermediate layers use uncoated or differently coated fabric that is suitable for heat sealing and RF welding. This segmentation allows each layer to fulfill its specific function without interfering with the manufacturing process.
Solution Approach 2:
The patent introduces an intermediary layer or modified fabric treatment that mediates between the flame-retardant aluminum coating and the heat sealing process. This intermediary layer allows heat and electromagnetic energy to pass through effectively for sealing and welding while the outer aluminum coating maintains its flame resistance function.
3Strength
If V-tape is applied to strengthen bonding, then the joint strength is improved, but visual inspection of adhesive bond becomes blocked
Solution Approach 1:
The patent replaces adhesive bonding with V-tape reinforcement with direct thermal bonding methods (heat sealing and RF welding). These processes create fusion bonds between the fabric layers that are inherently visible through the material, allowing for straightforward visual inspection of bond quality without blocking by additional tape or materials.
Solution Approach 2:
The patent utilizes color or transparency changes in the bonded regions to enable visual inspection. The heat sealed or RF welded areas exhibit distinct visual characteristics (such as color changes, transparency variations, or surface texture differences) that allow inspectors to easily detect bond quality and identify any defects without obstruction.
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 inspection capabilities, reducing manufacturing time and ensuring structural integrity.
Implementation Method 1
allowing for radio frequency welding or heat bonding
Implementation Method 2
allowing for radio frequency welding or heat bonding
Data Source
Figure 1~2A
Figure 2B
Figure 3A
AI summary
An inflatable stacked tube assembly may comprise a first panel (140, 240, 340) and a second panel (142, 242, 342). The first panel (140, 240, 340) may form a first portion of a top tube and a first portion of a bottom tube. The second panel (142, 242, 342) may form a second portion of the top tube and a second portion of the bottom tube. A first seam tape (180, 380) may be bonded to a first top tube interior surface portion of the first panel (140, 240, 340) and a second top tube interior surface portion of the second panel (142, 242, 342). The first seam tape (180, 380) may be located along a first fold formed by the first panel (140, 240, 340) and along a second fold formed by the second panel (142, 242, 342).