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Patents

Breathable and Microporous Thin Thermoplastic Film:

U.S. Patent No. 10,398,605

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By: Karen McIntyre

Editor, Nonwovens Industry

Leopoldo V. Cancio, Vero Beach, FL; Frank Eschenbacher, Schnelldorf, Germany; and Jerry Ford, Mason, OH.
Assigned to Berry Film Products Company, Inc., Evansville, IN.

Filed: 10/6/16
Issued: 9/3/19

A thermoplastic film made by a method comprising: extruding a web comprising a thermoplastic polymer; advancing the web onto a chill roller to form a film, the chill roller having a first temperature below the melting point of the thermoplastic polymer; advancing the film to a machine direction orientation section comprising at least one heated roller and at least one stretching roller; stretching the film in the machine direction orientation section while maintaining the film at a second temperature that produces a film having limited machine direction orientation; and stretching the film in the cross-direction; wherein the thermoplastic film has a ratio of machine direction load at break to a cross-direction load at break of less than about 10, a basis weight of 15 gsm or less, and a breathability of at least 500 grams H2O/24-hour/m2.

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