Nonwoven fabric and its manufacturing method

The nonwoven fabric addresses issues of weight unevenness, non-uniformity, and dust leakage by achieving a high white area ratio, efficient sodium chloride particle collection, and low intake resistance, resulting in a lightweight, uniform, and breathable mask material.

JP7664690B2Active Publication Date: 2025-04-18TORAY FINE CHEMICALS CO LTD
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Patent Information

Application Number
JP2020147363
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2020-09-02
Publication Date
2025-04-18
Estimated Expiration
2040-09-02

AI Technical Summary

Technical Problem

Existing nonwoven fabrics for masks suffer from issues such as weight unevenness, non-uniformity, dust leakage, and a trade-off between dust collection efficiency and breathability.

Method used

A nonwoven fabric made of thermoplastic resin fibers with a weight of 50g/m², characterized by a white area ratio of 95% or more after binarization, a minimum sodium chloride particle collection efficiency of 99.5% or more, and an intake resistance of 65 Pa or less when the collection efficiency is at its minimum.

Benefits of technology

The solution results in a nonwoven fabric that is lightweight, uniform, has minimal dust leakage, and maintains high dust collection efficiency while ensuring breathability.

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Abstract

To provide a nonwoven fabric which is small in weight unevenness, even, and small in leakage of dust.SOLUTION: A nonwoven fabric comprises a fiber of a thermoplastic resin, has a basis weight of 50 g / m2 or under, and is white, where all of the following characteristics are satisfied. Characteristic (1) When binarizing image data having 256 gradations obtained by imaging by overlapping a black mount on the nonwoven fabric with a threshold value of 240, the area percentage of white is 95% or more. Characteristic (2) The minimum value of a collection efficiency of sodium chloride is 99.5% or more. Characteristic (3) The air intake resistance when a collection efficiency is minimum value is 65 Pa or less.SELECTED DRAWING: Figure 2
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Citation Information

Patent Citations

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