Bag Packaging With Peelable Sealing Zone
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Solution Overview
Problem
Conventional bag packaging systems for small quantities of liquid or semi-liquid products, such as ketchup and mustard, often result in contamination when opened due to the escape of contents during tearing and adherence to hands, as existing opening aids like tear notches and laser cuts are inefficient.
Innovation Solution
The bag packaging system features a sealing zone adjacent to the sealing edge with a reduced adhesive force in the outlet zone, allowing for one-handed operation and preventing contamination by creating a peelable connection for the outer layer, which detaches from the bag front wall, enabling controlled dispensing of contents without sticking to hands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional opening aids like tear notches or laser cuts are used, then the bag can be opened, but the contents escape during tearing and contaminate the hands
Solution Approach 1:
The sealing seam is divided into two functional zones: a sealing zone with strong adhesive force to maintain integrity, and an outlet zone with reduced adhesive force to enable controlled opening. This segmentation allows the bag to remain sealed during normal use while facilitating clean, controlled dispensing when needed.
Solution Approach 2:
The adhesive force of the sealing seam is made non-uniform, with different adhesive characteristics in different regions. The sealing zone maintains high adhesive strength for structural integrity, while the outlet zone has reduced adhesive force to allow controlled peeling and clean content dispensing, preventing hand contamination.
2Strength
If the outer layer is strongly adhered to the bag front wall, then structural integrity is maintained, but the bag cannot be easily opened for dispensing
Solution Approach 1:
The adhesive layer exhibits spatially varying adhesive strength: strong adhesion in the sealing zone maintains structural integrity, while reduced adhesion in the outlet zone enables easy peeling and controlled opening for dispensing.
Solution Approach 2:
The adhesive connection between the outer layer and bag front wall is segmented into regions of different adhesive strength, allowing the structure to remain intact during storage and transport while enabling controlled opening when dispensing is required.
3Reliability
If the sealing seam is expanded to form a sealing zone, then sealing reliability is improved, but the complexity of the structure increases
Solution Approach 1:
The sealing seam is enhanced by expanding it into a sealing zone with specific geometric characteristics (triangle or strip shape) that provide improved sealing reliability through increased contact area and distributed stress, while the simplicity of the overall structure is maintained.
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 ensures that the contents can be opened and dispensed without contaminating the hands, as the outer layer is designed to separate easily from the bag wall, reducing the risk of leakage and adherence during the opening process.
Implementation Method 1
the adhesive layer (56) in an outlet zone (30) for filling material (11) to be provided with a reduced adhesive force compared to adhesive force in areas outside the outlet zone (30)
Data Source
Figure 1~9
Figure 2~5
Figure 10~12
AI summary
In a pouch packaging with a pouch front wall (12) and pouch back wall (14) formed from at least one flexible packaging film for packaging free-flowing contents (11), the pouch front wall (12) and the pouch back wall (14) are connected to each other by a sealing seam (24). The sealing seam (24) is extended in an area adjacent to a sealing edge (16) to form a sealing zone (26) directed away from the sealing edge (16), with a free end (27) furthest from the sealing edge (16). The pouch front wall (12) has an outer layer (28) on the side facing the outside of the pouch packaging. The outer layer (28) and the part (29) of the bag front wall (12) lying below the outer layer (28) define a discharge zone (30) for the filling material (11) in a surface area enclosing the free end (27) of the sealing zone (26) and extending to an edge (17) of the sealing rim (16).When pressure is applied, a crack (38) forms in the part (29) of the bag front wall (12) lying under the outer layer (28) in the area of the free end (27) of the sealing zone (26) and the contents (11) enter the discharge zone (30) and exit the bag packaging at the edge (17) of the sealing rim (16).