Balloon Envelope Lap Seal Structural Support
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-altitude balloons used in communication networks require stronger seams to withstand significant forces, but existing manufacturing methods lack sufficient structural support, making them prone to failure under operational forces.
Innovation Solution
A method involving a two-step heat sealing process using lap seal material to create a folded lap seal configuration, providing additional structural support by creating a first heat seal and then a wider second heat seal, with the lap seal material folded over itself to prevent self-sealing and applied on either the interior or exterior of the balloon envelope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single heat seal is used to join balloon envelope gores, then the manufacturing process is simple, but the seam strength is insufficient to withstand operational forces
Solution Approach 1:
The single heat seal process is segmented into two distinct heat seal operations: a first heat seal that creates an initial bond between the lap seal material and the first gore, and a second heat seal that creates a broader bond between the lap seal material and the second gore. This segmentation allows each seal to be optimized for its specific function, with the second seal providing broader coverage for enhanced strength while maintaining manufacturing feasibility through systematic process division.
Solution Approach 2:
The invention transitions from a single-point or narrow-line heat seal to a broader, wider heat seal for the second seal. This dimensional expansion in the width of the heat seal area distributes the stress over a larger surface area, significantly increasing the seam strength and structural support capability of the balloon envelope gore joints.
2Strength
If lap seal material is folded over itself to create a folded lap seal, then structural support is enhanced, but the risk of self-sealing defects increases
Solution Approach 1:
The first heat seal acts as an intermediary step that secures the lap seal material to the first gore before folding. This intermediate bonding prevents the folded lap seal material from contacting and adhering to itself during the second heat seal operation, thereby eliminating self-sealing defects while maintaining the structural benefits of the folded configuration.
Solution Approach 2:
The first heat seal is performed as a preliminary action before the folding and second heat seal steps. This preliminary bonding establishes a secure attachment point that prevents unwanted self-adhesion of the folded material, ensuring manufacturing precision is maintained throughout the subsequent folding and sealing operations.
3Strength
If the second heat seal is wider than the first heat seal, then structural support is maximized, but manufacturing complexity increases
Solution Approach 1:
The heat sealing process is designed with different seal widths at different locations: the first heat seal uses a narrower width appropriate for initial attachment, while the second heat seal uses a broader width for maximum structural support. This local differentiation optimizes the structural performance where needed while keeping the overall process manageable through clear distinction between the two sealing zones.
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 method significantly increases the structural support and usability of the balloon envelope, enhancing its ability to withstand operational forces and extend its lifespan by distributing stress more effectively across the seams.
Implementation Method 1
creating a first heat seal between the lap seal material and the first sheet of material; creating a second heat seal between the lap seal material and the second sheet of material
Data Source
AI summary
Aspects of the disclosure relate to techniques for manufacturing a balloon envelope. In one example, a first sheet of material for a first gore of the balloon envelope is provided. Lap seal material is arranged at least partially on the first sheet of material. A first heat seal is created between the lap seal material and the first sheet of material. A second sheet of material for a second gore of the balloon envelope is arranged over the first heat seal. A second heat seal is created between the lap seal material and the second sheet of material such that the lap seal material is configured to provide additional structural support to the balloon envelope.