Envelope Inner Bag Sizing for Tank Container Fit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inner bags for large tank containers, such as 20-foot ISO tank containers, face challenges in fitting properly due to shape differences, leading to filling failures and breakage due to inadequate sizing and welding complexities.
Innovation Solution
An envelope-type inner bag with specific size constraints (0.47·TLt≦IL≦0.6·TLt and 0.47·TLr≦IW≦0.6·TLr) and a second supply-discharge opening positioned centrally, allowing for easy production by welding both ends of tubular film, ensuring appropriate size and preventing filling failures and breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an envelope type inner bag is used in a cylindrical tank container, then the inner bag can be easily produced by welding both ends of tubular film, but gaps are created between the tank container and the inner bag due to shape difference
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between the inner bag dimensions (IL, IW) and tank container dimensions (TLt, TLr). The formulas IL = (0.47 to 0.60) × TLt and IW = (0.47 to 0.60) × TLr transform the dimensional parameters to achieve optimal fit while maintaining envelope type simplicity.
2Manufacturing precision
If the inner bag is not long enough, then a gap is created between the tank container and the inner bag, but the inner bag may be torn at both ends due to concentrated inertia force
Solution Approach 1:
The patent uses parameter changes by defining the length parameter IL within a specific range (0.47 to 0.60 times TLt) to balance two opposing requirements: preventing gaps that cause inertia force concentration while avoiding excessive length that would require complex welding. This quantitative parameter optimization resolves the contradiction between fit precision and strength.
3Manufacturing precision
If the inner bag is unnecessarily long, then it becomes impossible to adequately feed the liquid in folded portions at both ends, but the inner bag can prevent gaps and inertia force concentration
Solution Approach 1:
The patent applies parameter changes by optimizing the length parameter IL to fall within (0.47 to 0.60) × TLt. This quantitative constraint ensures the inner bag is long enough to eliminate gaps and prevent inertia force concentration, yet short enough to allow adequate liquid feeding in folded portions during filling operations.
4Manufacturing precision
If a cylindrical-shaped inner bag is used to fit the tank container properly, then the inner bag fits well in the tank container, but circular lid films must be prepared and welded in three-dimensional direction requiring exclusive guide apparatus
Solution Approach 1:
The patent applies inversion by reversing the conventional approach: instead of making the inner bag cylindrical to match the tank container shape, it uses an envelope type (rectangular cross-section) inner bag that is easier to manufacture. This inverted approach prioritizes manufacturing simplicity over exact shape matching, resolving the contradiction between fitting precision and device complexity.
Solution Approach 2:
The patent uses parameter changes by defining specific dimensional relationships for the envelope type inner bag (IL = (0.47 to 0.60) × TLt, IW = (0.47 to 0.60) × TLr) that optimize the fit within the cylindrical tank container without requiring the inner bag to be cylindrical itself. This parameter optimization enables the inverted approach to achieve satisfactory fitting precision.
Data Source
AI summary
An envelope type inner bag body is produced by welding both ends of a tubular film. A supply-discharge opening is welded at a position apart from one end portion of the inner bag body by a distance about IW/2 to form an inner bag for a transport tank, which is loaded in a cylindrical tank body. When length of the inner bag body is IL, width thereof is IW, inner peripheral length of the transport tank in a longitudinal cross-sectional surface in a longitudinal direction is TLt, and inner peripheral length of the transport tank in a longitudinal cross-sectional surface in a width direction is TLr, IL and IW satisfy the conditions: 0.47·TLt≦IL≦0.6·TLt, and 0.47·TLr≦IW≦0.6·TLr. The envelope type inner bag will be appropriate in size with respect to the transport tank, eliminating the filling failure of the liquid and the breakage of the inner bag.