Double-Roll Magnetic Closure for EMI Shielded Dry Bag
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Solution Overview
Problem
Conventional dry bags with magnetic closures lack both water-resistance and security due to single flap designs with strip magnets, which can easily open, allowing signal penetration and water ingress, and existing methods like sewing magnets into seams are impractical for achieving a watertight seal.
Innovation Solution
A double-roll magnetic closure system with neodymium magnets embedded in flush strips, ensuring alignment and a tight seal by using polymer embedding strips that are heat-fused to the bag's inner faces, providing both electromagnetic shielding and water-resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single flap closure with strip magnets is used, then the closure is easy to open and close, but the water-resistance and security are compromised
Solution Approach 1:
The closure system is divided into multiple segments: a first closure element with first magnets and a second closure element with second magnets, arranged in a double-roll configuration. This segmentation allows each element to contribute to both ease of operation and reliable sealing, as the distributed magnetic elements provide consistent attraction force across the entire closure area while maintaining simplicity.
Solution Approach 2:
The closure transitions from a single-flap planar design to a double-roll three-dimensional configuration. The first and second closure elements are arranged in sequential rolls, creating a multi-layer sealing structure that enhances water-resistance and security while preserving the ease of operation through the continuous magnetic attraction force across the rolled structure.
2Manufacturing precision
If magnets are sewn into separate pockets with plastic boards, then alignment is achieved, but water-resistance is compromised due to spaces between magnets and boards
Solution Approach 1:
The magnets are embedded directly into the closure elements themselves, merging the magnet function with the structural closure material. This eliminates the separate plastic board layer and the spaces between magnets and boards, creating a flush, water-tight surface while maintaining precise alignment through the embedding process.
Solution Approach 2:
The closure elements are constructed as composite structures combining magnetic materials with water-resistant polymer materials. The magnets are embedded within the polymer matrix, creating a unified composite material that provides both magnetic attraction force and water-resistance without the gaps present in separate component designs.
3Ease of manufacture
If conventional magnetic closures are used, then manufacturing is simple and cost-effective, but the seal is not tight enough to prevent signal and water penetration
Solution Approach 1:
The closure system uses multiple discrete magnetic elements distributed across first and second closure elements rather than a single large magnet. This segmentation maintains manufacturing simplicity and cost-effectiveness while achieving a tighter seal, as each small magnet contributes to the overall magnetic attraction force and the distributed arrangement creates multiple sealing contact points.
Solution Approach 2:
The closure elements are arranged in a double-roll configuration, adding a dimensional aspect to the sealing process. The sequential rolling action creates multiple layers of contact between the closure elements and the bag opening, enhancing seal tightness while the magnetic elements maintain ease of manufacture through simple embedding techniques.
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 double-roll magnetic closure system effectively secures the EMI/RF liner and maintains water-resistance, preventing signal and water penetration, while allowing easy opening and closing, thus enhancing the security and water-tightness of the bag.
Implementation Method 1
A double-roll magnetic closure system with neodymium magnets embedded in flush strips
Implementation Method 2
using polymer embedding strips that are heat-fused to the bag's inner faces
Data Source
AI summary
An exemplary electromagnetic shielded dry bag with magnetic closure system includes an outer bag, an inner shielding liner, and a pair of embedding strips having magnets embedded therein. The outer bag is preferably comprised of water-proof material and has a fluid-sealed floor portion and an access mouth disposed oppositely thereof. First and second bag panels are disposed oppositely of one another and extend from the floor portion to the access mouth. The inner shielding liner is comprised of electromagnetic shielding material and defines an electromagnetic shielding compartment within the bag. The embedding strips are secured to respective bag panels. This securement may be by way of heat fusing of respective securement elements to the inner faces, thereby forming pockets with which the strips reside. When the closure section is magnetically retained in closed configuration, the access mouth is thereby retained in an RF-sealed and fluid-sealed configuration to protect the shielding compartment.