Method of forming graded shade band on substrate
First Claim
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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Abstract
A method of forming a colored shade band having a relatively wide portion of essentially uniform intensity and a relatively narrow boundary portion of graded intensity by spraying a dye composition along a longitudinally extending edge portion of a non-electroconductive substrate such as a glass sheet or a sheet of plastic. In one embodiment of this invention, the substrate is sprayed to form the graded band and then laminated to a layer of plastic interlayer material to produce a laminated window having a shade band having a desired transverse pattern of graded intensity along a longitudinally extending edge portion thereof. After the dye composition is applied to a sheet of rigid transparent material to form the band, the coated sheet is assembled with the band facing a layer of interlayer material to form a sandwich to be laminated, the band is transferred from the sheet to the layer during lamination and forms a continuous looking band free of any disturbing features such as mottled appearance and having a boundary along a smooth line and a pattern of intensity similar to that of the colored shade band initially developed. In another aspect of this invention, the graded band is applied electrostatically to either the interlayer sheet or to the rigid transparent layer under special conditions that results in a gradation of the coating.
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Citations
20 Claims
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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, and discontinuing 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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12. A method of forming a band of colored material along an outer edge portion of a surface of a flexible nonconductive substrate, said band having a maximum intensity along its outer edge, a decreasing intensity adjacent the inner edge of said band and a curved inner edge for said band comprising
supporting a flexible substrate in an orientation in a first plane, supporting a grounded shield of electroconductive material having a curved edge above said substrate with said curved 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 flexible substrate, from electrostatic spray means spaced from said shield an atomized electroconductive spray of colored coating composition capable of forming said band on said flexible substrate, simultaneously applying a non-reactive fluid between said grounded shield and said substrate 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, and discontinuing 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.
Specification