Inflatable Tensioning Structure Using Strands to Cut Weight
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Solution Overview
Problem
Conventional inflatable products face challenges in maintaining shape and weight reduction due to the use of thick PVC tension bands, which increase the weight and packed volume of the deflated structure.
Innovation Solution
The use of thin, flexible strands connected via weld strips to maintain the shape of inflatable products, providing high tensile strength while minimizing weight and packed volume by creating a tensioning structure with a high operable area-to-weight ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick PVC tension bands are used to maintain shape, then structural strength is improved, but weight and packed volume increase
Solution Approach 1:
The continuous PVC tension band is segmented into discrete strands spaced at intervals. These individual strands (e.g., 2-5 mm diameter) are distributed across the tensioning surface, providing the necessary tensile strength through collective action while significantly reducing material usage compared to a solid band. The strands can be arranged in patterns such as grids or parallel arrays to optimize strength distribution.
Solution Approach 2:
The patent replaces thick solid PVC bands with thin film structures that have integrated tensile elements. The thin film substrate (e.g., 0.1-0.5 mm PVC or similar material) provides flexibility and distributes loads, while embedded or attached tensile members (strands, ribs, or reinforced zones) provide the primary strength. This combination maintains structural integrity while minimizing weight and packed volume.
2Strength
If thick PVC tension bands are used to maintain shape, then structural strength is improved, but packed volume increases
Solution Approach 1:
Segmenting the tension band into discrete strands allows the deflated structure to collapse more efficiently. The strands can be compressed into smaller volumes between the deflated chambers, and the overall structure achieves greater compactness. When inflated, the strands distribute tension forces effectively across the expanded surface area.
Solution Approach 2:
The tensioning structure utilizes the third dimension (depth/thickness) more efficiently by creating a layered or multi-level strand arrangement. Strands can be positioned at different depths or angles to provide strength in multiple directions while occupying minimal volume when deflated. This dimensional optimization allows the structure to maintain strength during inflation while achieving smaller packed size.
3Manufacturing precision
If more tension bands are added to increase rectangularity, then shape precision is improved, but weight increases
Solution Approach 1:
The tensioning system is divided into multiple discrete strand groups arranged in specific patterns (e.g., longitudinal strands for length stabilization, transverse strands for width stabilization, and corner strands for rectangularity). This segmented approach allows precise control over shape parameters while using minimal material in each zone, optimizing the weight-to-shape-control ratio.
Solution Approach 2:
Different strand densities and configurations are applied to different regions of the inflatable structure based on local requirements. Areas requiring higher precision (e.g., corners and edges) have denser strand arrangements, while central areas with lower precision requirements have sparser arrangements. This localized optimization achieves the desired rectangularity while minimizing overall weight.
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 maintains the shape of inflatable products with reduced weight and packed volume, achieving a high operable area-to-weight ratio and tensile strength, making it suitable for various inflatable applications.
Implementation Method 1
The tensioning structure is formed by connecting a pair of plastic strips sheets via spaced-apart strands, such as strings or wires... the plastic strips facilitate a strong, long-lasting weld between the tensioning structure and the inflatable product
Data Source
AI summary
An internal tensioning structure for use in an inflatable product fulfills the basic function of maintaining two adjacent inflatable surfaces in a desired geometric arrangement when the inflatable product is pressurized. The tensioning structure is formed by connecting a pair of plastic sheets to spaced-apart strands, such as strings or wires. When pulled taut, the strands provide a high tensile strength. At the same time, the plastic sheets facilitate a strong, long-lasting weld between the tensioning structure and the inflatable product.