Pleating Spacer for Respirator Filter Surface Area
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Solution Overview
Problem
Current protective face masks, including N95 respirators, are ineffective in preventing the spread of airborne pathogens like SARS-CoV-2 and cause discomfort due to reduced airflow, leading to issues like headaches and impaired cognition when worn for extended periods.
Innovation Solution
The use of pleating spacers that stabilize and increase the surface area of pleated filters in masks, allowing for improved airflow while maintaining filtration efficiency, by either being removeable and repositionable or integrally positioned to form and separate pleats, thereby enhancing breathability and prolonged wearability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the filter surface area is increased to improve filtration capacity, then the mask size increases, but the mask becomes bulkier and less comfortable to wear
Solution Approach 1:
The patent applies pleating to transform the filter from a flat two-dimensional structure to a three-dimensional pleated structure. This allows the filter surface area to be increased by utilizing the depth dimension of the mask, thereby improving filtration capacity without proportionally increasing the mask's overall footprint or bulkiness.
Solution Approach 2:
The pleated filter structure allows multiple layers of filter material to be nested within each other in a compact arrangement. The pleats are folded and stacked in a space-efficient manner, maximizing the filter surface area within the limited depth available in the mask structure.
2Quantity of substance
If the filter surface area is increased to improve filtration capacity, then the airflow resistance increases, but breathability deteriorates
Solution Approach 1:
By transitioning from a flat to a pleated three-dimensional structure, the filter provides multiple airflow paths through the pleated layers. This increases the effective surface area for filtration while maintaining breathability, as air can flow through multiple channels created by the pleats rather than being forced through a single flat layer.
Solution Approach 2:
The pleated filter divides the filtration surface into multiple segmented pleats, creating numerous parallel airflow channels. This segmentation allows air to be distributed across many small pathways, reducing resistance in each individual channel while maintaining high overall filtration capacity.
3Duration of action of moving object
If the mask is designed for extended wear to improve comfort, then the airflow must be sufficient, but prolonged use causes headaches and cognitive impairment
Solution Approach 1:
The pleated three-dimensional structure increases the total filter surface area available for airflow, allowing sufficient air passage even during extended wear periods. This maintains breathability and prevents the buildup of carbon dioxide and heat that would otherwise occur with prolonged use of flat-filter masks.
Solution Approach 2:
The pleated filter structure is pre-configured to provide optimal airflow characteristics from the start of wear. The increased surface area and multiple airflow paths are built into the structure beforehand, ensuring that adequate breathing is maintained throughout extended wear without requiring adjustment or intervention during use.
Data Source
AI summary
The present invention relates to improved protective pleated facial masks or respirators that comprise a pleating spacer that is adapted to enter into, and stably separate the folds of one or more of pleats of a pre-pleated mask or respirator filter, or a pre-pleated filter layer thereof. The present invention also relates to improved protective pleated facial masks or respirators that comprise a pleating spacer that is adapted to stably form one or more pleats in an initially unpleated filter of a facial mask or respirator, or a filter layer thereof. The pleating spacers of the present invention thus act to increase the effective surface area of the filters of such masks or respirators, and thereby improve airflow while preserving the ability of the mask or respirator to protect the wearer from hazardous agents. The invention also pertains to such pleating spacers, and particularly pertains to the use of such pleated facial masks or respirators to protect the wearer from particulates such as dust or other airborne debris, chemical agents, and/or biological agents (e.g., bacteria, fungi, and viruses) from air being inhaled or exhaled by the wearer.