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Doctor blade for use in coating continuous strips of material or similar substrates

  • US 5,520,731 A
  • Filed: 12/07/1994
  • Issued: 05/28/1996
  • Est. Priority Date: 10/20/1990
  • Status: Expired due to Fees
First Claim
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1. A resilient, strip doctor blade element adapted to be clamped at a clamped end portion along a clamping line, in a holder, with an obliquely formed chamfered metering surface for the coating or metering of a composition onto a web of material or a roll continuously moving at a constant rate, the chamfered metering surface located at an end of said blade element opposite said clamped end portion, wherein said blade element includes parallel upstream and downstream broad sides which define an upstream metering edge and a downstream metering edge with said chamfered metering surface, respectively, the doctor blade element having at least one modification in a cross section thereof along at least one line or edge parallel to one of the downstream metering edge and chamfered metering surface, wherein the doctor blade has a change in cross sectional thickness which is provided between the clamping edge and the chamfered metering surface either continuously or in at least one step discontinuity, the doctor blade having a first thickness adjacent the chamfered metering surface and a second thickness at the clamping edge, said first thickness greater than said second thickness, a chamfer angle α

  • , formed between said downstream broad side and said chamfered metering surface, being between 25° and

    45°

    , and a complementary angle, formed between said upstream broad side and said chamfered metering surface, being equal to 180°

    minus said chamfer angle α

    .

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