Bear-Resistant Bag Laminate with Flexible Closing Sleeve
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Solution Overview
Problem
Existing bear-resistant containers fail to prevent access by both bears and smaller animals, and often allow moisture intrusion, with traditional cinch systems struggling to close stiff bag laminates effectively.
Innovation Solution
A laminate system combining Spectra fabric, EVA, and Kevlar, with a unique closure system using hook and loop fasteners and a flexible exterior sleeve, enhances resistance to bears and smaller animals while preventing moisture ingress, and accommodates stiffer materials that traditional systems cannot handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional cinch systems are used to close bear bags, then the closure system is simple and easy to operate, but it fails to effectively close stiff bag laminates
Solution Approach 1:
The patent introduces a flexible exterior closing sleeve as an intermediary component between the stiff main bag laminate and the closure system. This sleeve acts as a mediator that translates the action of traditional cinch cords into effective closure on the rigid laminate material, solving the incompatibility between simple closure mechanisms and stiff bag materials.
Solution Approach 2:
The exterior closing sleeve is constructed from flexible material that contrasts with the stiff main bag laminate. This flexible shell component allows the closure system to adapt to and effectively seal the rigid laminate structure, enabling traditional cinch systems to work with stiff materials without requiring complete redesign of the closure mechanism.
2Strength
If thicker and stiffer laminate materials are used for bear resistance, then puncture and tear resistance improve, but the bag becomes difficult to close with traditional closure systems
Solution Approach 1:
The bag is segmented into distinct functional components: a stiff main bag laminate for animal resistance and a separate flexible exterior closing sleeve for closure operations. This segmentation allows each component to be optimized for its specific function - the stiff laminate provides strength while the flexible sleeve enables easy closing with traditional cinch systems.
Solution Approach 2:
The flexible exterior closing sleeve serves as a flexible shell that interfaces with the stiff laminate. This flexible component allows users to easily manipulate and close the bag using traditional closure methods, while the stiff laminate maintains its puncture and tear resistance properties without being directly manipulated during closing operations.
3Reliability
If conventional bag materials are used, then the bag is easier to manufacture and close, but it fails to prevent access by both bears and smaller animals
Solution Approach 1:
The patent employs a composite laminate structure combining multiple materials with complementary properties. The laminate includes layers of stiff material for bear resistance, flexible material for ease of manipulation, and waterproof layers for moisture protection. This composite construction achieves superior animal resistance while maintaining manufacturability through standardized lamination processes.
Solution Approach 2:
Different regions of the bag are constructed with different material properties optimized for their specific functions. The main bag laminate uses stiff, bear-resistant material, while the exterior closing sleeve uses flexible material for ease of closure. This local differentiation of material qualities allows the bag to meet multiple performance requirements simultaneously without compromising ease of manufacture.
4Ease of operation
If traditional closure systems are used with flexible bags, then the closure is easy to operate, but moisture can still intrude through the closure mechanism
Solution Approach 1:
The exterior closing sleeve is constructed as a composite structure incorporating waterproof materials and sealed construction techniques. This composite closure system maintains ease of operation with traditional cinch mechanisms while adding moisture protection through waterproof layers and sealed seams in the closing assembly.
Solution Approach 2:
The flexible exterior closing sleeve incorporates waterproof thin film layers that prevent moisture intrusion while allowing the sleeve to remain flexible for easy closing operations. The waterproof film integrates with the flexible material to provide both closure functionality and moisture protection without compromising ease of operation.
Data Source
AI summary
An animal resistant bear bag (100) is comprised of a laminate (400) configuration comprised of specially formulated ballistic grade Spectra fabric (200), EVA (300), ethylene vinyl acetate and specially formulated Kevlar correctional grade fabric. The lamination process may involve various temperature ranges and various rolling and/or compression techniques. A bear and critter bag may contain food intended for human consumption and is designed and constructed to prevent bears and other animals from accessing, eating or otherwise absconding with the contained food. Animal resistance is enhanced by the use of use of four or so Spectra thread seams and the use of specially constructed cord. A uniquely designed access and closure system allows humans quick access to bag contents while solving the problem of using laminate that is too rigid to cinch closed with traditional systems. An exterior closing sleeve (500) may extend beyond the main bag assembly (600).