Elastic Sliding Bands for Complete Bag Closure
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Solution Overview
Problem
Existing plastic bags with sliding ties for household waste retention face issues with incomplete closure, partial leakage during handling, and complex welding processes, which compromise the effectiveness and simplicity of the closure mechanism.
Innovation Solution
A plastic bag design featuring two faces welded along opposite lateral edges with an opening, incorporating elastic sliding links and notches, where the links form initial, secondary, and tertiary loops, with facing indentations allowing for complete closure and secure attachment without additional thickness or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transverse welds are added under notches to prevent leakage, then closure reliability is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The elastic band is divided into multiple loops (initial loop, secondary loop, tertiary loops) with different functions. The secondary loop provides closure reliability while the tertiary loops maintain simplicity of the welding process by being integrated into the existing sheath structure without requiring additional transverse welds.
Solution Approach 2:
Multiple loops are nested within the sheath structure. The secondary loop is formed within the sheath by welding the elastic band to itself at specific points, creating a nested configuration that provides closure reliability without adding external complexity.
2Reliability
If welds are added to fix elastic band ends to bag periphery, then closure reliability is improved, but manufacturing complexity and weld zone thickness increase
Solution Approach 1:
The fixation of elastic band ends to the bag periphery is merged with the existing sheath welding process. The elastic band is welded to the bag periphery at multiple points along its length, combining the fixation function with the sheath formation process, thereby maintaining ease of manufacture while improving closure reliability.
3Reliability
If elastic band length is reduced by welds, then closure effectiveness is improved, but the band cannot maintain proper opening position
Solution Approach 1:
The elastic band is segmented into multiple loops with different length characteristics. The secondary loop has reduced effective length due to welds, providing closure effectiveness, while the tertiary loops maintain sufficient length to preserve the opening position when the bag is placed on a container.
Solution Approach 2:
The multiple loops create a dynamic configuration where the secondary loop provides closure when needed, while the tertiary loops maintain the opening position. The elastic band can dynamically adjust its configuration based on whether the bag is being closed or is in use, resolving the contradiction between closure effectiveness and opening position maintenance.
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
Ensures effective and complete closure of the bag, maintaining the contents securely while simplifying the welding process and avoiding partial leakage during handling.
Implementation Method 1
The links are fixed together in each notch, to define a loop of length less than that of the opening of the bag. The bag is placed open on a container, the elasticity of the links ensuring its maintenance on the container.
Implementation Method 2
the two faces of the bag being welded to one to the other along two opposite lateral edges
Data Source
Figure 1
AI summary
Bag (1) consisting of two faces (2, 3) joined together around their entire periphery except for a transverse edge, the bag having an opening (8) leading to said transverse edge, the two faces (2, 3) of the bag being welded to each other along two opposite lateral edges (4, 5), each face having a sheath (10, 12) bordering said opening (8) and in which is disposed an elastic sliding tie (11, 13), each tie (11, 13) being graspable from the outside by at least one lateral notch (14, 15) of said sheaths (10, 12), the ends of the ties (11, 13) being fixed to each other at the level of each lateral notch (14, 15) by welds (16, 17) so as to form an initial closed loop of length substantially equal to the distance between the two edges lateral (4, 5) of the bag (1), characterized in that, at a distance from the lateral notches (14, 15), the sheaths (10, 12) have opposite notches (18, 19),at which the said links (11, 13) are fixed to each other by welds (20, 21) to define a secondary loop of shorter length than that of the said initial loop, and two tertiary loops between their fixing welds (16, 17) at the lateral notches (14, 15) and their fixing welds (20, 21) at the opposite notches (18, 19).