METHOD OF MANUFACTURING SOUNDPROOF SHEET AND SOUNDPROOF SHEET
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United States of America Patent
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Issued Date -
Feb 29, 2024
app pub date -
Aug 28, 2023
filing date -
Aug 29, 2022
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Abstract
A method of manufacturing a soundproof sheet includes a first accumulating step of producing a web in which a plurality of first fibers, which are natural fibers, and a plurality of second fibers including a first core portion and a first coating layer coating the first core portion and having a first melting point are mixed, a heating step of heating the web to melt the first coating layer, a first cooling step of cooling the web in a state where the first coating layer is melted to solidify the first coating layer, a pressurized heating step of heating the web to melt the first coating layer and applying a predetermined compressive force to the web, and a second cooling step of cooling the web subjected to the pressurized heating step to a temperature lower than the first melting point to solidify the first coating layer.
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