Multi-Chamber Bag Reinforcement for Stable, Easy-Rupture Seams
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Solution Overview
Problem
Existing multi-chamber bags for medicinal and nutritional products face conflicting requirements where the rupturable seam needs to be both stable during transportation and storage, yet easily rupturable for mixing, without compromising the integrity of the product chambers.
Innovation Solution
A multi-chamber bag design featuring a planar reinforcement seam element located at the interface of inner permanent and rupturable seams, positioned closer to the hanger-sided edge, enhancing stability and robustness while allowing easy rupture for product mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rupturable seam is made stable and robust during transportation and storage, then the integrity of product chambers is maintained, but the ease of rupturing the seam for mixing is reduced
Solution Approach 1:
The seam structure is designed with different properties at different locations: the outer permanent seam provides stable connection throughout, while the inner rupturable seam has localized weakened sections (reduced sealing width, perpendicular orientation to outer seam) that facilitate easy breaking at specific points while maintaining overall seam integrity during transport
Solution Approach 2:
The seam is divided into multiple segments with different functions: outer permanent seams for structural integrity, inner permanent seams for chamber separation, and inner rupturable seams for controlled opening. This segmentation allows each segment to optimize its specific function without compromising the whole system
2Device complexity
If the inner permanent seam and inner rupturable seam are positioned close to each other, then the structure is simplified, but the stability of the bag during misuse is reduced
Solution Approach 1:
The reinforcement seam element is strategically positioned at the interface between permanent and rupturable seams, creating a localized strength enhancement exactly where the stress concentration occurs during misuse, without requiring overall structural complexity
Data Source
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Figure 3
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AI summary
A multi-chamber bag (10) for a medicinal and/or nutritional product is described. A product space (26) of the multi-chamber bag (10) is delimited by mutually opposite sides of a first flexible film (18), a second flexible film (20) and an outer permanent seam (22) locally connecting the first flexible film (18) and the second flexible film (20). The product space (26) is subdivided into at least two product chambers (12, 14, 16) by at least one inner permanent seam (34) and at least one inner rupturable seam (28, 30, 32). A planar reinforcement seam element (38) is arranged at an interface of the at least one inner permanent seam (34) and the at least one inner rupturable seam (28, 30, 32). The planar reinforcement seam element (38) locally connects the first flexible film (18) and the second flexible film (20). The planar reinforcement seam element (38) is arranged closer to a hanger-sided edge (10a) of the multi-chamber bag (10) than to a port-sided edge (10b) of the multi-chamber bag (10). Alternatively, the planar reinforcement seam element (38) is arranged in the middle between the hanger-sided edge (10a) of the multi-chamber bag (10) and the port-sided edge (10b) of the multi-chamber bag (10).