×

Vacuum assisted slot die coating techniques

  • US 8,771,793 B2
  • Filed: 04/15/2011
  • Issued: 07/08/2014
  • Est. Priority Date: 04/15/2011
  • Status: Active Grant
First Claim
Patent Images

1. A method for applying a wet film to a substrate, comprising:

  • applying a coating material at a discharge rate about 2 ml/min to about 20 ml/min from a discharge end of a slot die onto a moving web of said substrate at a moving rate of about 10.0 m/min to about 45.0 m/min to form said wet film on said substrate, said wet film including a width and a thickness relative to said substrate, wherein said discharge end of said slot die comprises an upstream bar and a downstream bar each bar having an essentially planar land surface facing said moving web, and wherein a constant coating gap of about 40 μ

    m to about 450 μ

    m is maintained between said discharge end of said slot die and said moving web;

    applying a vacuum force adjacent said discharge end of said slot die, wherein said vacuum force creates a pressure differential between an upstream side of said discharge end and a downstream side of said discharge end, and wherein said pressure differential is between about 1 inch of H20 and about 10 inches of H20; and

    adjusting said vacuum force in real-time while applying said coating material to control said width and thickness of said wet film.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×