PPE Mask Conversion With Inner-Outer Frames and Airtight Sealing
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Solution Overview
Problem
Existing personal protective equipment (PPE) masks, such as surgical masks and N95 respirators, often fail to provide an optimal seal with the wearer's face, leading to reduced filtration efficiency and increased breathing difficulty, while face shields offer limited protection against air flow around the sides and do not integrate well with masks.
Innovation Solution
A facial covering assembly comprising an inner and outer frame with apertures for airflow, a cushioning element for airtight sealing, and optional eyewear engagement features, which can convert standard masks into airtight, ergonomic, and comfortable face shields with enhanced filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard masks are used, then basic filtration is provided, but mask fit and seal are insufficient leading to reduced filtration efficiency
Solution Approach 1:
The mask system is divided into multiple functional layers including an inner mask layer, outer mask layer, headgear system, and seal enhancement components. Each layer performs a specific function: the inner mask provides basic filtration, the outer mask enhances structural integrity, the headgear ensures proper positioning, and seal enhancement components create airtight seals around the face, collectively achieving high filtration efficiency
Solution Approach 2:
The mask includes pre-formed structural elements such as a rigid or semi-rigid frame, pre-curved bridge section, and pre-positioned ear loops that are designed beforehand to automatically conform to facial contours upon wearing. This preliminary structuring eliminates the need for complex adjustment procedures and ensures consistent fit and seal across different users
2Reliability
If masks are made tighter to improve seal, then filtration efficiency increases, but breathing difficulty increases
Solution Approach 1:
The mask applies different levels of tightness and sealing to different facial regions: high sealing pressure is applied to critical leakage areas such as the nose bridge and cheek regions using molded nose pieces and adjustable straps, while the mouth and chin areas maintain adequate clearance and airflow channels to facilitate comfortable breathing without compromising overall seal integrity
Solution Approach 2:
The mask design incorporates three-dimensional spatial optimization with a raised bridge section that creates vertical clearance for breathing, while seal enhancement elements extend laterally to seal the sides of the face. This multi-dimensional approach separates the sealing function from the breathing function, allowing tight seals without restricting airflow
3Object-affected harmful factors
If face shields are used, then protection against air flow is provided, but they do not integrate well with masks and offer limited protection
Solution Approach 1:
The system merges the mask and face shield into a unified integrated assembly where the face shield is positioned directly over the mask with sealed interfaces between the two components. The headgear system serves both the mask and face shield simultaneously, creating a coordinated protective system that functions as a single unit rather than separate layers, thereby simplifying integration while enhancing protection
4Productivity
If masks are worn longer to extend duration, then productivity is maintained, but mask durability decreases
Solution Approach 1:
The mask employs materials with enhanced physical and chemical parameters including high-tensile-strength fabrics, corrosion-resistant metal components, and UV-stabilized polymers. These material parameter improvements allow the mask to maintain its structural integrity, filtration performance, and seal effectiveness over extended periods of continuous wear and multiple reuse cycles, extending durable service life
Data Source
AI summary
A facial covering assembly comprises an inner frame comprising at least one aperture to allow air flow through the inner frame and an outer frame configured to couple to the inner frame. The outer frame comprises at least one aperture to allow air flow through the outer frame. The facial covering assembly further comprises a cushioning element configured to couple to the inner frame, the cushioning element configured to establish a seal around at least a portion of a user's face.