Metallized polyethylene plexifilamentary film-fibril sheet
AssigneeE. I. Du Pont de Nemours and Company
InventorsDavid C. Jones, Chi-Chang Lee
Life of this patent
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Abstract
A metallized high specular gloss polyethylene plexifilamentary film-fibril sheet with very low emissivity is made by a process of calendering a polyethylene film-fibril sheet between a smooth metal roll and a soft, resilient roll to form a sheet of high specular gloss, followed by vacuum metallization of the smooth high specular gloss surface. Such metallized sheets are useful as radiant barriers or roof liners for energy savings purposes.
Claims6
A process for preparing a metallized polyethylene plexifilamentary film-fibril sheet having an emissivity on at least one side of from 0.06 to 0.18 comprising:
- (a) hot calendering a polyethylene plexifilamentary film-fibril sheet to a specular gloss on at least one side of at least 28 percent by passing the sheet through a nip, with a pressure of at least 18 kilograms per centimeter, wherein a first roll in the nip is a metal roll with a surface smoothness of no greater than 5 rms micro-inch and is maintained at a temperature sufficient to heat a surface of the sheet to between 0.degree. to 8.degree. C. below the melting point of the polyethylene sheet and a second roll in the nip has a 70 Shore A durometer hardness or less;
- (b) vapor depositing a metal on the calendered side of the sheet.
Dependencies are inferred from the claim text.