Adhesive Bag Closure for Natural-Fiber Packaging Strength
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Solution Overview
Problem
Existing methods for closing packaging bags made of natural fibers, such as cellulose or cotton, using thermal welding cause fiber weakening and are not desirable due to high temperatures, while metal clips are not suitable for providing sufficient mechanical strength.
Innovation Solution
A device and method using a metal-free closure strip sealed with adhesive, preferably a biological adhesive, that penetrates the packaging material completely or almost completely in the closure region, combined with a metal-free closure tape strip to stabilize and protect the adhesive closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal welding is used to close packaging bags made of natural fibers, then a closure with sufficient mechanical strength is achieved, but the high temperature causes unwanted weakening of individual fibers in the packaging mesh
Solution Approach 1:
The patent replaces thermal welding (thermal energy-based closing mechanism) with adhesive bonding (chemical-based closing mechanism). The adhesive penetrates the mesh structure and bonds fibers together without requiring high temperatures, thus avoiding fiber weakening while still achieving sufficient closure strength.
Solution Approach 2:
The patent changes the closing mechanism from high-temperature thermal welding to low-temperature adhesive bonding. This parameter change in temperature and bonding method allows the closure to achieve mechanical strength without exposing the natural fibers to damaging high temperatures.
2Strength
If metal clips are used to close packaging bags made of natural fibers, then the closure provides sufficient mechanical strength, but the structure becomes more complex and metal components are introduced
Solution Approach 1:
The patent merges the closure tape and adhesive into a single integrated closing system. The adhesive is applied to the closure tape, which is then attached to the packaging bag, combining the structural support function and bonding function into one unified mechanism, thereby simplifying the overall closure structure while maintaining strength.
Solution Approach 2:
The adhesive acts as an intermediary substance between the closure tape and the packaging bag material. This intermediary enables bonding without requiring mechanical interlocking or complex fastening mechanisms, simplifying the closure structure while achieving sufficient mechanical strength.
3Ease of manufacture
If adhesive is applied only superficially to the packaging bag material, then the closure process is simpler, but internal fibers cannot be fixed and may come loose
Solution Approach 1:
The patent utilizes the porous or mesh structure of the packaging bag material to allow adhesive penetration. The adhesive is applied in a way that it penetrates through the mesh structure to reach and bond internal fibers, ensuring comprehensive fiber fixation while maintaining a relatively simple closure process.
Solution Approach 2:
The adhesive is applied to the closure tape before attachment, allowing it to penetrate and prepare the bonding surface in advance. This preliminary action ensures that when the closure is applied, the adhesive is already positioned to bond both surface and internal fibers effectively.
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 adhesive closure effectively fixes all fibers in the closure area without damaging them, providing mechanical stability and avoiding the need for metal clips, while maintaining the structural integrity of the packaging material.
Implementation Method 1
The material of the packaging bag is at least almost completely penetrated by the adhesive in the closure region
Data Source
AI summary
A method and a device for closing packaging bags with the aid of adhesive and to a packaging. The packaging bags are sealed with the aid of adhesive, the material of the packaging bag being at least almost completely penetrated by the adhesive in the sealing area.