Rigid Resealable Label Flap Hinge via Partial Slit
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Solution Overview
Problem
Conventional resealable label flaps made of stiff materials face issues with hinge formation, as hard creases lead to material breakage and soft creases fail to maintain closure, making it difficult to achieve consistent sealing and repeated opening/closing without damaging the package.
Innovation Solution
A multi-layer resealable label flap with a hinge formed in a rigid base layer, featuring a slit that extends completely through the base layer and adhesive, allowing for easy separation and reattachment, and a top layer with a permanent adhesive to prevent complete removal from the package frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hard crease is formed in the rigid base layer to create a hinge, then the label flap can be easily bent and opened, but the material tends to break at the hinge location
Solution Approach 1:
The base layer is segmented by forming a slit that extends partially through its thickness, creating a hinge region. This segmentation allows the flap to bend easily along the slit while the unslit portions maintain structural integrity and prevent complete material breakage.
Solution Approach 2:
The hinge region has different physical properties than the rest of the base layer. The slit creates a localized area of reduced thickness and increased flexibility only where needed for bending, while the remaining portions of the base layer maintain their original strength and rigidity.
2Strength
If a soft crease is formed in the rigid base layer to create a hinge, then the material strength is maintained, but the hinge resists bending and fails to maintain closure
Solution Approach 1:
The partial-through slit segments the base layer thickness, creating a hinge that bends easily. The segmentation provides sufficient flexibility for opening and closing operations while maintaining closure when the flap is in the closed position.
3Reliability
If a more rigid material is used for the label flap to maintain package shape, then sealing consistency is improved, but bending the flap to access the opening becomes more difficult
Solution Approach 1:
The partial-through slit segments the rigid base layer, creating a hinge region that bends easily while the rest of the rigid material maintains package shape and sealing consistency. This allows the flap to be both rigid for reliable sealing and flexible for easy opening.
Solution Approach 2:
The hinge region has localized flexibility due to the slit, while the rest of the label flap maintains rigid properties. This local quality change enables easy bending at the hinge while preserving the rigidity needed for consistent sealing across the package opening.
4Ease of operation
If the slit extends completely through the base layer, then separation and reattachment is facilitated, but the structural integrity of the base layer is compromised
Solution Approach 1:
The slit segments only a portion of the base layer thickness, not completely through. This partial segmentation provides sufficient ease of separation and reattachment for resealing operations while maintaining enough structural integrity to prevent complete base layer failure.
Solution Approach 2:
Instead of extending the slit completely through the base layer (excessive action), the slit extends only partially (partial action). This provides just enough separation capability for resealing while avoiding the excessive structural compromise that would result from a complete-through slit.
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 solution enables repeated and secure sealing of package openings without material breakage, maintaining the package shape and ensuring consistent access to contents while preventing contamination and drying out.
Implementation Method 1
The base layer includes a first adhesive on a bottom face surface that permits repeated application and separation of the base layer relative to the package. A top layer is attached to the base layer and includes a second adhesive on a bottom face surface that permanently attaches the top layer to a top face surface of the base layer.
Implementation Method 2
The base layer and the first adhesive on the bottom face surface thereof are formed with a slit that defines a hinge for enhancing separation of the base and top layers from the package upon manipulation of the starting tab.
Data Source
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AI summary
A resealable label flap is positionable to cover an opening in a package containing removable articles. The label flap includes a base layer extending between a first and a second end. The base layer includes a first adhesive on a bottom face surface and permits repeated application and separation of the base layer relative to the package. The base layer has a starting tab to permit removal of the base layer from the package. A top layer includes a second adhesive on a bottom face surface that fixes the top layer to a top face surface of the base layer. The base layer and the first adhesive are formed with a slit that defines a hinge for enhancing separation of the base and top layers from the package upon manipulation of the starting tab.