Pressurized Bottle Pouch with Circular Cross-Section
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Solution Overview
Problem
Existing pocket designs for pressurized bottles require multiple welds and result in significant dead space due to their geometry, limiting filling capacity and flexibility for compact storage and narrow bottle insertion.
Innovation Solution
A tubular wall is created by overlapping and welding the side edges of a strip, reducing the number of welds and eliminating protruding edges, with a quasi-circular cross-section and a flexible bottom for enhanced compactibility and reduced dead space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the pocket is formed with four welds including side welds that form protruding edges, then the structural integrity is improved, but the dead space inside the bottle increases and the bottle must be oversized
Solution Approach 1:
The invention divides the welding structure into segments: the side welds are positioned at the ends of the tubular wall rather than forming continuous protruding edges, and the bottom weld is separated as a distinct closure. This segmentation eliminates the protruding edges that cause dead space while maintaining structural integrity through strategic placement of weld segments.
Solution Approach 2:
The pocket is designed with a curved, oval cross-section that follows the cylindrical contour of the bottle. This curvature allows the pocket to conform to the bottle's shape, maximizing space utilization and eliminating dead spaces that would occur with flat-bottomed or angular designs.
2Strength
If a thick plate is used to close the bottom of the pocket, then the structural strength is improved, but the ability to roll up the bag and reduce storage volume is lost
Solution Approach 1:
The bottom closure is constructed from flexible laminated material rather than a rigid thick plate. This flexible membrane maintains structural integrity through its material composition and welding connections while allowing the pocket to be rolled up, compressed, and stored in compact forms.
Solution Approach 2:
The bottom closure parameters are optimized to balance strength and flexibility: the material thickness and composition are selected to provide sufficient structural strength while maintaining flexibility for rolling. The welding configuration at the bottom also contributes to strength without compromising flexibility.
3Ease of manufacture
If the pocket has an oval or elliptical cross-section with flattened bottom, then the manufacturing is simplified, but the dead space increases and filling rate decreases
Solution Approach 1:
The pocket is formed with a curved oval cross-section that closely follows the cylindrical contour of the bottle. This curved geometry maximizes the filling volume by eliminating dead spaces while remaining compatible with standard cylindrical bottle shapes and manufacturing processes.
Solution Approach 2:
The cross-sectional parameters of the pocket are optimized to achieve a curved oval shape that balances manufacturing feasibility with maximum filling efficiency. The curvature radius and elliptical dimensions are selected to conform to the bottle's cylindrical shape, maximizing space utilization.
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
This design reduces the number of welds, minimizes dead space within the bottle, and allows for easier introduction into smaller bottles and storage, while maintaining flexibility for rolling and efficient filling.
Implementation Method 1
The tubular wall is obtained by overlapping and welding the two side edges of a strip
Implementation Method 2
the tubular wall is closed in its lower part by flat welding of the lower edge of the wall
Data Source
Figure 1~4
Figure 5~9
AI summary
The invention relates to a pouch (1) for a pressurized bottle, made up of a tubular wall (2) closed in its upper part (22) by a welded seam into which a valve (4) is incorporated. According to the invention, the tubular wall (2) is obtained by overlapping and welding together the two lateral edges of a strip, and the tubular wall (2) is closed in its lower part (21) by an essentially round bottom wall (3). Thus, the tubular wall (2) of the pouch will have a practically circular cross section in a large lower part, this cross section tending towards an elliptical shape as it nears the upper end (22) where it becomes completely flat. The pouch (1) will, at least in a major lower part, occupy practically all the space in the bottle, considerably reducing the dead space in that part.