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Method of forming graded shade band on substrate

  • US 4,138,284 A
  • Filed: 01/09/1978
  • Issued: 02/06/1979
  • Est. Priority Date: 06/10/1976
  • Status: Expired due to Term
First Claim
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1. A method of forming a band of colored material along an outer edge portion of a surface of a non-conductive substrate, said band having a maximum intensity along its outer edge and a decreasing intensity adjacent the inner edge of said band comprising,supporting a grounded shield of electroconductive material adjacent said substrate with an edge of said shield approximately aligned with said inner edge of said portion of said substrate to which said band is to be applied,applying by electrostatic spraying in an oblique direction toward said outer edge portion of a surface of said substrate, from electrostatic spray means spaced from said shield, an atomized electroconductive spray of colored coating composition containing a mixture of dyes as essential ingredients and capable of forming said band on said substrate,and simultaneously applying a non-reactive fluid between said grounded shield and said substrate surface toward said outer edge portion of said substrate surface at a rate sufficient to apply a component of force to said atomized spray in a direction parallel to said surface sufficient to control the formation of a smooth boundary portion of graded intensity in a band of colored coating composition that results from the electrostatic spraying of said atomized spray, anddiscontinuing said simultaneous application of said atomized spray from said electrostatic spray means and said non-reactive fluid when said band develops a desired degree of color intensity.

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