THERMALLY INSULATING SHEET FORMED FROM A DOWN CORE STRUCTURE AND METHOD OF FABRICATION
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United States of America Patent
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Issued Date -
May 27, 2021
app pub date -
Feb 4, 2021
filing date -
Mar 19, 2018
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Abstract
A thermally insulating sheet formed by a down core structure which is comprised solely of down feather material mixed with binding material which is heat fused together to form a homogeneous sheet core. The method of fabricating the homogeneous thermally insulating sheet to form the down core structure is described. This novel method restrains the down clusters and binding material during the process of mixing, depositing, conveying and heat fusing to form a homogeneous down core sheet. The down core structure is subjected to two separate heat treatments which produces a down core sheet having at least some of its outer surfaces being of higher bond density than the inside of the core.
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