Pull Tab With Differential Adhesive Zones For Resealable Packaging
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Solution Overview
Problem
Existing packaging designs for consumer goods, such as cigarettes, often fail to provide an effective barrier for preserving flavor and freshness while ensuring easy access and re-sealability, leading to issues with contamination and physical damage.
Innovation Solution
A container design featuring a rigid outer box with a hinged lid and a rigid inner box, equipped with a re-sealable pull tab that uses a combination of permanent and re-stick adhesives to seal and unseal the opening, along with a paper liner to enhance sealing and protect the contents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a label with tacky substance is used to cover the opening of the inner container, then the opening is sealed, but the label cannot be easily removed or re-sealed
Solution Approach 1:
The pull tab is designed with differential adhesive properties: permanent adhesive at the top for fixed attachment to the outer container, and re-stick adhesive at the bottom for removable attachment to the inner container. This dynamic adhesive design allows the pull tab to transition between fixed and movable states, enabling easy opening and re-sealing while maintaining sealing effectiveness.
Solution Approach 2:
The pull tab is segmented into distinct functional zones with different adhesive characteristics. The top portion has permanent adhesive for secure attachment, while the bottom portion has re-stick adhesive for removable attachment. This segmentation allows each zone to perform its specific function, resolving the contradiction between easy operation and sealing reliability.
2Reliability
If the pull tab is made of flexible polymer material with adhesive zones, then it provides effective sealing, but the structure becomes more complex
Solution Approach 1:
The pull tab serves multiple functions within a single component: it seals the opening, provides a mechanism for opening, enables re-sealing, and maintains structural integrity. By integrating these functions into one multi-functional element with differentiated adhesive zones, the design achieves effective sealing without proportionally increasing structural complexity.
Solution Approach 2:
The adhesive properties of the pull tab are varied along its length, with permanent adhesive at the top and re-stick adhesive at the bottom. This parameter change in adhesive characteristics allows the single pull tab structure to achieve complex sealing and opening functions without requiring multiple separate components.
3Reliability
If the paper liner extends beyond the opening, then it provides additional sealing and protection, but it increases the amount of material and potential waste
Solution Approach 1:
The paper liner is designed to extend beyond the opening to provide enhanced sealing and protection during use. When the pull tab is removed after opening, the paper liner remains attached to the inner container, providing ongoing protection for the contents. This design maximizes the utility of the material throughout the product lifecycle.
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 design provides an improved barrier for preserving product freshness, simplifies the opening process, reduces waste, and offers a more durable and cost-effective packaging solution by minimizing the number of components and streamlining assembly.
Implementation Method 1
the pull tab including re-stick adhesive on an underside thereof, the re-stick adhesive providing a seal around the opening when the hinged lid is closed
Implementation Method 2
a rectangular strip of flexible polymer material, an upper zone of permanent adhesive on a first side of the strip
Implementation Method 3
a paper liner adhered to a central portion of the pull tab, the paper liner having an outer periphery inwardly of an outer periphery of the pull tab, the outer periphery of the paper liner extending beyond the opening and overlying portions of the inner box surrounding the opening
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
A pull tab (10) configured to close an opening in a box, the pull tab comprising a rectangular shaped sheet of polymer material including a zone of re-stick adhesive (32) on an underside thereof, to releasably adhere to an area of a top and front wall of the box, the pull tab further comprising a line of weakness (20) forming a connecting tab (40) at an end of sheet of polymer material, the zone of re-stick adhesive on the underside of the polymer material including one or more triangular-shaped areas (42) of re-stick adhesive on an underside of the connecting tab.