Tamper-Proof Packaging Bag Closure Assembly
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Solution Overview
Problem
Existing packaging bag closure assemblies are not sufficiently resistant to internal and external stresses, leading to potential accidental opening and leakage unless the closure is forced.
Innovation Solution
A closure assembly with two complementary elements carried by support webs, where the support webs are articulated on the bag film at localized zones on opposite ends of the elements, with a local extra thickness to enhance hinge effect and shear resistance, and a double closure mechanism to prevent easy opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support web is articulated on the film at a zone offset from the closure element, then the closure elements are protected from internal pressure and separation, but the closure assembly becomes more susceptible to opening forces and less tamper-proof
Solution Approach 1:
The patent applies local quality by varying the thickness of the support web at specific locations. The web has a first thickness in the articulation zone for flexibility and hinge movement, and a second, greater thickness in the closure element zone for enhanced strength and resistance to opening forces. This localized variation in physical properties resolves the contradiction between needing articulation flexibility and closure strength.
Solution Approach 2:
The patent changes the physical parameter of the support web's thickness to resolve the contradiction. By increasing the thickness parameter in the closure element region while maintaining a thinner profile in the articulation region, the design achieves both the necessary hinge flexibility and the required resistance to opening forces, making the closure more tamper-proof.
2Strength
If the support web is made thicker to increase resistance to opening forces, then the strength and tamper-proof capability improve, but the flexibility and hinge effect at the articulation zone are reduced
Solution Approach 1:
The support web is designed with different local qualities - a thinner first thickness in the articulation zone for hinge flexibility and a thicker second thickness in the closure element zone for strength. This spatial variation in thickness allows the web to exhibit both flexibility where needed and strength where required, resolving the contradiction between ease of operation and strength.
Solution Approach 2:
The support web is segmented into distinct thickness zones: a first zone with lesser thickness for articulation flexibility and a second zone with greater thickness for closure strength. This segmentation allows each zone to independently perform its function - the thinner zone provides hinge movement while the thicker zone provides resistance to opening forces.
3Ease of manufacture
If the closure assembly uses a simple single-element design, then the ease of manufacture is improved, but the resistance to internal and external stresses is insufficient leading to accidental opening
Solution Approach 1:
The closure assembly is segmented into multiple functional elements: closure elements for sealing, support webs for structural support and articulation, and a slider for operation. This segmentation allows each component to be optimized for its specific function while working together to provide enhanced stress resistance, maintaining reliability without excessive manufacturing complexity.
Solution Approach 2:
The closure assembly uses composite construction combining different materials and structures - the support web combines regions of different thicknesses, the closure elements use interlocking profiles, and the slider provides mechanical actuation. This composite approach enhances overall stress resistance while keeping the manufacturing process integrated and manageable.
Data Source
Figure 1~5
Figure 2a~3b
Figure 4a~4b
AI summary
The present invention relates to a bag comprising a closure assembly (100) including two complementary elements (110, 120) carried by respective support webs (112, 122) attached to a film (10) at a localized area (114, 124) distant from the corresponding closure element (110, 120) in order to allow the articulation of said support webs (112, 122) on the film (10), said localized areas (114, 124) being disposed on respective ends opposite the webs (112, 122), respectively on either side of the complementary elements (110, 120), such that one of the articulated webs (112) is directed towards the interior of the bag while the other articulated web (122) is directed towards its opening, characterized in that the support webs (112, 122) exhibit a local overthickness (116, 126) at the level of their respective localized zone (114, 124) arranged so that a free end of the support walls (112, 122),which is adjacent to the closing elements (110, 120), is located at a distance from the wall (10, 20) when the closing assembly (100) is at rest.