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Profiled Extrusion Replication

  • US 20130037987A1
  • Filed: 03/21/2011
  • Published: 02/14/2013
  • Est. Priority Date: 03/30/2010
  • Status: Active Grant
First Claim
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1. A process for making a structured film, comprising steps of:

  • (a) extruding a molten material through an extrusion die having at least one profiled die lip to form a molten extrudate having first and second major extrudate surfaces and having a first structural feature in the first major extrudate surface;

    (b) bringing the molten extrudate into contact with a tool surface comprising one or more second structural features so as to cause a portion of the first structural feature in the first major extrudate surface to contact at least one of the second structural features on the tool surface; and

    (c) cooling the molten extrudate to provide the structured film;

    wherein a ratio of a cross-web cross-sectional area of the first structural feature to a cross-web cross-sectional area of a second structural feature is about 1.0.

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