Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Reexamination Certificate
2004-12-21
2009-06-09
Meeks, Timothy H (Department: 1792)
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
C427S008000, C427S430100
Reexamination Certificate
active
07544382
ABSTRACT:
A method for controlling the thickness and uniformity of a dip coated layer, using a coating apparatus in a normal coating environment, includes the following steps: forming under normal coating conditions of ambient temperature and relative humidity a series of coated layers on a metal substrate having a thickness of at least about 500 microns, 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; 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).
REFERENCES:
patent: 4618559 (1986-10-01), Yashiki
patent: 6270850 (2001-08-01), Cai et al.
Eastman Kodak Company
Kessler Lawrence P.
Meeks Timothy H
Turocy David
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