Back to results
US 11,590,443 B2Granted
System and method for making electret media
AssigneeClean & Science Co., Ltd.
InventorKyung-Ju Choi
Life of this patent
Estimating the term…
Abstract
A system and method for making electret media is presently provided. The method involves placing a piezoelectric material adjacent a media and applying a mechanical stress to the piezoelectric material and thereby transferring an electric charge from the piezoelectric material to the media and making the electret media. The system is configured to place the piezoelectric material adjacent the media and to apply mechanical stress to the piezoelectric material.
Claims21
A method of making electret media comprising the steps of:
- feeding a piezoelectric material and a media configured to accept an electric charge between a first set of adjacent rollers, having an upper roller adjacent a lower roller;
- feeding the piezoelectric material and the media configured to accept an electric charge between a second set of adjacent rollers, having an upper roller adjacent a lower roller, wherein the second set of adjacent rollers are gap spaced from the first set of adjacent rollers;
- and
- applying a mechanical stress to the piezoelectric material and thereby transferring an electric charge from the piezoelectric material to the media and making the electret media.
1 more element
A system configured for making electret media comprising:
- a media receiving zone configured for receiving a piezoelectric material and a media;
- a media exit zone configured for discharging the piezoelectric material and the media;
- a media conveying zone between the media receiving zone and the media exit zone;
- the media conveying zone being configured to convey the piezoelectric material adjacent the media and to at least periodically contact the piezoelectric material with the media;
- and
- at least one of a-c, wherein a-c are:
- a. an oscillator configured for applying an oscillating force to the piezoelectric material and tensioning and relaxing the piezoelectric material;
- b. a mover configured for moving at least one of the media receiving zone and the media exit zone closer and away from each other, shortening and lengthening the media conveying zone;
- and
- c. a rate changing apparatus configured to change the rate of at least one of a rate of the electret media being received in the receiving zone and a discharge rate of the electret media being discharged from the exit zone.
7 more elements
Dependencies are inferred from the claim text.