Flat-fold Respirator Weld Patterns for Collapse Resistance
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Solution Overview
Problem
Flat-fold filtering face-piece respirators are prone to collapse due to moisture buildup and rough handling, which compromises their structural integrity and wearer comfort, often requiring additional layers that increase breathing resistance and costs.
Innovation Solution
A flat-fold filtering face-piece respirator design featuring transversely-extending lines of demarcation with two-dimensional enclosed weld patterns above and below the longitudinal axis, providing crush-resistant properties without the need for additional layers, thus maintaining the mask's shape and improving comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If additional layers are added to the mask body structure to improve structural integrity, then collapse resistance is improved, but breathing resistance increases and manufacturing cost increases
Solution Approach 1:
The patent transitions from a flat 2D mask structure to a 3D dimension by incorporating a rigid support insert that extends into the interior space of the mask body. This insert creates a three-dimensional framework that provides structural reinforcement without adding external layers, thereby maintaining breathability while improving collapse resistance through spatial dimensionality.
Solution Approach 2:
The patent employs a rigid support insert that functions as an internal shell structure within the mask body. This insert acts as a thin-walled rigid framework that maintains the mask's cup-shaped configuration and resists collapse from external forces, providing structural integrity without requiring multiple thick layers of material.
2Strength
If additional layers are added to the mask body structure to improve structural integrity, then collapse resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines the rigid support insert with the filter media layers by positioning the insert between them, creating an integrated assembly. The insert is secured to the mask body structure through attachment mechanisms that merge it with existing components, reducing the need for separate manufacturing steps and lowering overall production costs compared to adding multiple external layers.
Solution Approach 2:
The patent extracts the structural support function from the external mask body layers and places it internally as a separate rigid support insert. This extraction allows the support structure to be manufactured independently and then integrated, simplifying the manufacturing process and reducing costs associated with creating multi-layer composite structures.
3Strength
If the mask body is made more rigid to prevent collapse, then structural integrity is improved, but wearer comfort deteriorates
Solution Approach 1:
The patent applies rigidity locally through a rigid support insert positioned specifically in regions of the mask body most susceptible to collapse, such as the sides and bottom. The filter media and other mask components maintain their natural flexibility in areas that contact the wearer's face, ensuring comfort while providing targeted structural reinforcement where needed.
Solution Approach 2:
The patent segments the mask body into distinct functional zones: a rigid support insert for structural integrity, flexible filter media for breathability and comfort, and separate attachment mechanisms. This segmentation allows each component to perform its specific function optimally—the rigid insert prevents collapse while the flexible materials maintain wearer comfort.
Data Source
AI summary
A flat-fold filtering face piece respirator 10 that comprises a mask body 12 that has a transversely-extending line of demarcation 22 and a longitudinal axis 34. First and second weld patterns 32a, 32b are disposed above and not traversing the line of demarcation on each side of the longitudinal axis 34, respectively. Third and fourth weld patterns 32c, 32d are disposed below and not crossing the line of demarcation 22 on each side of the longitudinal axis 34, respectively. Each of the first, second, third, and fourth weld patterns 32a-32d is a two-dimensional enclosed pattern. This combined weld patterns can provide a mask body that exhibits crush resistance without the need for additional or heavier layers, which may cause higher pressure drops across the filtering structure.