Parallel Line Weld Pattern in Respirator Mask Body
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Solution Overview
Problem
Existing filtering face-piece respirators are prone to collapse due to moisture buildup and rough handling, leading to discomfort and reduced structural integrity, which is not effectively addressed by single weld lines or additional layers.
Innovation Solution
The use of closely-spaced parallel weld lines in the mask body creates a beam effect, enhancing structural integrity and reducing the risk of collapse, while also allowing for faster welding speeds and reduced manufacturing costs.
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 device complexity and manufacturing cost increase
Solution Approach 1:
The mask body is segmented into multiple functional layers (filtering layer, support layer, cover layer) that work together to provide structural integrity. The parallel weld lines further segment the mask body into reinforced zones, creating a composite structure that resists collapse without requiring excessive material or complexity
Solution Approach 2:
The mask body uses composite construction with different layers serving different functions: a filtering layer for particle removal, a support layer for structural strength, and a cover layer for protection. This composite approach achieves high structural integrity while maintaining reasonable complexity by assigning specific roles to each layer
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 mask body is segmented into multiple functional layers (filtering layer, support layer, cover layer) that work together to provide structural integrity. The parallel weld lines further segment the mask body into reinforced zones, creating a composite structure that resists collapse without requiring excessive material or complexity
Solution Approach 2:
The invention changes the welding parameters by using parallel weld lines instead of single weld lines or additional material layers. This parameter change in the welding process achieves enhanced structural integrity through optimized weld geometry (two closely-spaced parallel lines) rather than through increased material quantity, thereby controlling manufacturing cost
3Strength
If single weld lines are used to provide structural support, then structural integrity is improved, but collapse resistance is insufficient
Solution Approach 1:
The support function is segmented from a single weld line into multiple parallel weld lines. This segmentation distributes the structural load across multiple reinforcement zones, preventing localized failure and improving overall collapse resistance while maintaining structural integrity
Solution Approach 2:
The welding reinforcement transitions from a single-line (one-dimensional) approach to a parallel multi-line (two-dimensional) arrangement. This dimensional change creates a more robust reinforcement pattern that better resists collapse forces while maintaining structural integrity
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 respirator maintains its shape and structural integrity, improving wearer comfort and reducing breathing resistance, with lower material usage and manufacturing costs.
Implementation Method 1
the weld lines are formed by contact with a welder that heats the filtering structure to a temperature sufficient to fuse the layers of filtering structure together
Implementation Method 2
heats the filtering structure to a temperature sufficient to fuse the layers of filtering structure together
Data Source
AI summary
A respirator 10 that has a harness 14 and a mask body 12 that is joined to the harness 14. The mask body 12 includes a filtering structure 16 that may contain a plurality of layers of nonwoven fibrous material 58, 60, 62. The layers of nonwoven fibrous material 58, 60, 62 have a thickness A and are welded together by at least two parallel weld lines 34′, 34″ that are spaced at 0.5 to 6 times A. A mask body that uses parallel weld lines may exhibit better resistance to collapse and may be manufactured at faster speeds than similar structures which use single weld lines of comparable width.