Patent Number: 6,251,495

Title: Low emissivity products and methods for making same

Abstract: This invention relates to a method for producing a product which exhibits (a) a low level of emissivity and (b) a high level of moisture vapor permeability, and which enables trapped excess moisture to be transported from the product to the surrounding atmosphere while maintaining its effective radiant barrier properties. The product is an underlying substrate, having a pair of outer major surfaces and a radiant barrier material adhered to at least one of the pair of outer major surfaces of the underlying substrate with an adhesive material to form a radiant barrier material covered substrate. A plurality of apertures are formed in the radiant barrier material covered substrate. These apertures extend substantially completely through both the radiant barrier material and the adhesive material thereby forming substantially completely open moisture vapor flow channels which create a high level of moisture vapor permeability through the radiant barrier material and the adhesive material. In this way, a substantial amount of trapped excess moisture can pass from the underlying substrate into the surrounding atmosphere to avoid unwanted degradation of the underlying substrate, while maintaining the low level of emissivity of the product.

Inventors: Wilson; Elwin R. (Portland, OR), Fang; Yi Pygn (Lake Oswego, OR)

Assignee: Louisiana-Pacific Corporation

International Classification: B32B 38/04 (20060101); B32B 3/24 (20060101); E04D 12/00 (20060101); B32B 003/24 (); B32B 031/00 ()

Expiration Date: 06/26/2018