Elongate Closure With Thickened Edges And Ribs
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Solution Overview
Problem
Traditional clipband closures for flexible packaging lack sufficient clamping force, leading to potential opening and adverse presentation of packaged products, especially when used in semi-automatic packaging machines, where positioning is critical and the closure can only be placed in one position for increased force.
Innovation Solution
The clipband closure features thickened longitudinal edges with embedded metal wires and additional longitudinal ribs, which increase the clamping force by providing a larger force per unit area and acting as a 'barb' to secure the packaging, allowing for improved slip resistance and direct force transmission without relying on the central plastic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the forces in the packaging device are increased to make the ends of the closure overlap more tightly, then the closing action is improved, but the closure flexibility is reduced and the metal wires cannot be folded at sharp angles
Solution Approach 1:
The closure is segmented into distinct functional zones: thickened longitudinal edges for structural support and force application, and a thinner central body for flexibility. This segmentation allows different parts to perform different functions - the edges provide rigid clamping while the center maintains bendability.
Solution Approach 2:
The closure has non-uniform thickness distribution with thickened longitudinal edges and a thinner central body. This local quality variation optimizes the balance between clamping force (at the edges) and flexibility (at the center), allowing the closure to be both strong and adaptable.
2Force
If a longitudinal rib is added to increase grip and stability, then the clamping force is improved, but the closure asymmetry increases making it suitable for only one position in semi-automatic packaging machines
Solution Approach 1:
The closure deliberately incorporates asymmetric features (longitudinal ribs at different positions on each edge) to create directional clamping force. This asymmetry is optimized for the specific application in semi-automatic packaging machines where the closure is always applied in the same orientation, maximizing clamping effectiveness.
Solution Approach 2:
The longitudinal ribs are pre-positioned on the closure during manufacturing to create optimal clamping geometry before the closure is applied to the packaging. This preliminary configuration ensures that when the closure is applied, the ribs are already in the correct position to maximize grip and stability.
3Device complexity
If the longitudinal rib is supported by the central plastic body, then the structure is simpler, but the clamping force is reduced because the central body is flexible and cannot transmit force effectively
Solution Approach 1:
The thickened longitudinal edges act as intermediaries between the longitudinal ribs and the central plastic body. These edges provide a rigid transmission path for clamping force, mediating between the force-generating ribs and the flexible central body, thereby effectively transmitting clamping force to the packaging.
Solution Approach 2:
The closure combines materials and structures with different mechanical properties: the thickened longitudinal edges provide rigidity for force transmission, while the central plastic body provides flexibility. This composite structure allows the closure to simultaneously achieve strong clamping force and adaptability.
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
The enhanced clipband closure maintains the packaging in a closed position effectively, with significantly higher sliding resistance compared to traditional closures, ensuring the contents remain secure and the packaging appears intact, even with less-than-optimal machine settings.
Implementation Method 1
The metal wire imparts clamping force to the closure, so that the closure remains in the closed position and engages and clamps the locally gathered neck of the packaging
Implementation Method 2
the longitudinal ribs increase the slip resistance between the closure and the packaging due to the force per unit area being larger compared to the known closure without a longitudinal rib
Data Source
Figure 1~2
AI summary
The invention relates primarily to an elongate closure 10 for closing an access side of a flexible packaging, comprising an elongate plastic strip 12 which has a central body 14 and is provided with thickened longitudinal edges 16 which are spaced apart in the width direction of the strip 12, with the strip having a closure side 20 which is turned towards the access side of the flexible packaging in a closed position, with at least one of the longitudinal edges 16 on the closure side 20 being provided with a longitudinal rib 24 having a clamping edge 26) which is turned towards the packaging..