Methods of saturating nonwoven fabrics with liquid and the making of electret thereof
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United States of America
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Mar 18, 2025
Grant Date -
Aug 26, 2021
app pub date -
May 17, 2019
filing date -
May 17, 2019
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Abstract
A method of preparing an electret by saturating a nonwoven fabric with a liquid, such as water, and removing the liquid via suction to generate charges by friction between the fabric fibers and the liquid is described. The saturating can be carried out, for example, by impinging the bottom side of the fabric with a jet or jets of water while the fabric is being pulled under a solid roller. Excess water can also be applied during a water quenching step of a meltblowing or spunbonding process. An apparatus for preparing an electret according to the presently disclosed methods is also described.
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