Side-Gusseted Pouch Folding Layout for Delamination Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing side-gusseted pouches experience delamination at the lower end coupling portion when filled with liquid contents, leading to potential leakage due to the separation of heat-sealed films.
Innovation Solution
The pouch design includes folding guide portions and connecting portions in the side gusset films that guide the folding of the films when filled, ensuring the lower and upper end coupling portions are positioned below and above imaginary intersection points, respectively, to distribute the load evenly and prevent delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the side gusset films are heat-sealed to the front side film and rear side film by a side seal, then the pouch structure is formed and can accommodate liquid contents, but delamination occurs at the lower end coupling portion when pressure is applied, leading to potential leakage
Solution Approach 1:
The side gusset film is divided into distinct functional regions: a front side sealing region, a rear side sealing region, and a non-sealing region with coupling portions. The lower end coupling portion is specifically designed as a separate functional element that connects the front and rear side outer edges at the bottom, distributing stress away from the heat-sealed regions and preventing delamination.
2Strength
If the lower end coupling portion is positioned at the pouch bottom portion when filled and inflated, then the structure provides support, but stress concentration occurs at this location under pressure, causing delamination
Solution Approach 1:
The lower end coupling portion is designed with a curved or rounded geometry rather than sharp angles. This curvature distributes the stress from the filled and inflated pouch more evenly across the coupling region, preventing stress concentration at specific points and reducing the risk of delamination while maintaining structural support.
3Ease of manufacture
If the side gusset films are designed with simple sealing regions only, then the manufacturing process is simplified, but the pouch cannot properly accommodate liquid contents without delamination under pressure
Solution Approach 1:
The side gusset film is segmented into distinct functional regions: front side sealing region, rear side sealing region, and non-sealing region with coupling portions. This segmentation allows each region to be optimized for its specific function while maintaining overall structural integrity and resistance to delamination under pressure.
Solution Approach 2:
Different regions of the side gusset film are designed with different properties: the sealing regions are optimized for heat sealing to the front and rear side films, while the non-sealing region with the lower end coupling portion is designed for stress distribution and structural support. This local differentiation of properties ensures both manufacturability and reliability.
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 effectively reduces delamination at the pouch bottom, maintaining the integrity of the seal and preventing liquid leakage, even under pressure or when stacked.
Implementation Method 1
a folding guide portion that guides folding of each of the side gusset films when a liquid contents accommodating portion is filled with liquid contents
Implementation Method 2
side gusset films on both right and left sides disposed between the front side film and the rear side film and to be heat-sealed to the front side film and the rear side film by a side seal
Data Source
AI summary
Provided is a side-gusseted pouch that reduces occurrence of delamination in the vicinity of a lower end coupling portion of a side gusset film. A side-gusseted pouch in which in at least one of side gusset films on right and left sides, a lower side inclined edge portion includes a folding guide portion and a lower end side connecting portion that connects a lower end of the folding guide portion and a lower end coupling portion, and the lower end side connecting portion connects the lower end of the folding guide portion and the lower end coupling portion such that the lower end coupling portion is located below a first imaginary intersection point at which a central imaginary line passing through an upper end coupling portion and the lower end coupling portion intersects a folding imaginary line defined by the folding guide portion.