Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Reexamination Certificate
2004-12-21
2009-06-16
Meeks, Timothy H (Department: 1792)
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
C427S430100, C427S008000
Reexamination Certificate
active
07547461
ABSTRACT:
A method for controlling the thickness and uniformity of a dip coated layer, using a coating apparatus under conditions of controlled temperature and controlled low humidity, includes the following steps: under normal coating conditions of ambient temperature and relative humidity, forming on a metal substrate having a thickness of at least about 500 microns a series of coated layers using variations in coating solution viscosity m, coating substrate withdrawal speed v, capillary number Ca, coating solution surface tension S, and boiling point bp (a correlative of evaporation rate) of the coating solution solvent, a coated layer including at least a portion of uniform thickness T(even) and, optionally, a portion of non-uniform thickness L(uneven); statistically analyzing measurements carried out on the series of coated layers and generating the constants, a, b, c, d, and e for Equations 2, 3, and 4:in-line-formulae description="In-line Formulae" end="lead"?T(even)=a+b(m*v) (Equation 2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?L(uneven)=c+d*(v*bp)+e*(Ca*bp) (Equation 3)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?v(even)=−c/bp*(d+e*m/S) (Equation 4)in-line-formulae description="In-line Formulae" end="tail"?using Equation 4, determining the coating speed v(even) producing the maximum thickness of a coated layer having a completely uniform thickness for a given set of coating solution characteristics, the coated layer being formed on a thin substrate under coating conditions of controlled temperature and controlled low humidity; and using Equation 2, determining the thickness T(even) of the portion of the coated layer having uniform thickness for a given set of coating solution characteristics and the coating speed determined in step (c), the coated layer being formed on a thin substrate under coating conditions of controlled temperature and controlled low humidity.
REFERENCES:
patent: 4618559 (1986-10-01), Yashiki
patent: 6270850 (2001-08-01), Cai et al.
Denshi Shashin Gakkai-shi “Electrophotography”, vol. 28, No. 2, (1989) pp. 54-63 (186-195).
P. Groenveld, “Thickness Distribution in Dip-Coating”, J. Paint Technology, V ol. 43, No. 561, Oct. 1971.
Anderson Andrew J.
Eastman Kodak Company
Kessler Lawrence P.
Meeks Timothy H
Turocy David
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