Protective Hood Bead Sealing for Mask Transition
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Solution Overview
Problem
Existing hoods for protective and military clothing, such as NBC suits, face challenges in achieving a high degree of tightness at the transition between the hood and equipment like protective masks, especially with contoured mask shapes, which can lead to the penetration of toxic substances.
Innovation Solution
The hood features an elastically deformable bead-shaped thickening at the outer edge, enclosing a filling material and made of a different material than the covering part, providing enhanced sealing capabilities even on heavily structured surfaces by forming a tunnel-like structure that ensures a snug fit and high elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional hem with sealing element is used, then the hood can be manufactured with standard materials, but the sealing tightness at the transition to contoured mask shapes is insufficient
Solution Approach 1:
The patent applies a bead-shaped thickening with filling material specifically at the outer edge portion where sealing is required, while the rest of the hood maintains its original simple structure. This localized modification provides enhanced sealing capability without making the entire hood complex.
Solution Approach 2:
The bead-shaped thickening combines a different material than the covering part with filling material inside, creating a composite structure that provides both structural integrity and sealing elasticity. This composite approach enables high sealing tightness while maintaining manufacturability.
2Reliability
If the sealing element is attached to the hem, then the sealing function is provided, but it creates a bump or elevation that reduces comfort and sealing effectiveness
Solution Approach 1:
The bead-shaped thickening merges the sealing function directly into the hem structure itself, eliminating the need for separate attached sealing elements. The thickening is formed as an integral part of the outer edge portion, providing sealing contact without creating uncomfortable bumps or elevations.
3Ease of manufacture
If the outer edge portion uses the same material as the covering part, then manufacturing is simplified, but sealing performance on heavily structured surfaces is insufficient
Solution Approach 1:
The patent uses a different material specifically for the bead-shaped thickening at the outer edge portion compared to the covering part. This localized material differentiation provides the necessary elasticity and non-slip properties for effective sealing on structured surfaces, while the rest of the hood can be manufactured with simpler materials.
Solution Approach 2:
The combination of different materials in the bead-shaped thickening (outer material plus filling material) creates a composite structure with superior sealing properties including higher elasticity, non-slip characteristics, and tear resistance, while maintaining overall manufacturing feasibility.
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
This design achieves a simple and effective sealing of the transition area, preventing the ingress of toxic substances and ensuring the wearer's protection by using a material with higher elasticity, non-slip properties, and tear resistance, thus enhancing the overall sealing efficiency.
Implementation Method 1
an elastically deformable bead-shaped thickening (8), which encloses a filling material (10)
Implementation Method 2
an inner material which comprises an adsorptive material, in particular activated carbon (e.g. in the form of activated carbon grains or beads or activated carbon fibers)
Implementation Method 3
a water vapor-permeable, at least essentially gas- or air-impermeable barrier layer which prevents or at least delays the passage of harmful gases or liquids
Data Source
Figure 1
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AI summary
An illustration and a description are given of a hood (1) for an item of clothing or as a constituent part of an item of clothing, in particular of an item of clothing for protective and/or military purposes, such as an ABC protective suit or the like.