| 摘要 |
PURPOSE: A method is provided which promptly, accurately and simply controlling an organic covering adhesion amount to be covered on a steel sheet by deriving adhesion amount control equations most suitable for the current organic coating facility from actual operation data of an organic covered steel sheet using statistic techniques. CONSTITUTION: The method for controlling an adhesion amount of resin and chromate on a steel sheet by roll coating comprises the steps of storing data per each conditions of circumferential velocity ratios of each rolls, pressures between the rolls, speed and size of a steel sheet and adhesion amount that are obtained in the normal operation for a certain period of time; setting control factors for an upper coater and a lower coater; obtaining combinations of adjusted correlation coefficients and major control factors obtained from the set control factors by total regression and stepwise regression, and determining combinations of optimum control factors most influencing on the adhesion amount from the combinations based on the adjusted correlation coefficients; significance verifying data corresponding to the optimum control factors, and adjusting the adjusted correlation coefficients to 0.6 or more; forecasting coefficients for the optimum control factors using data obtained through the significance verification; deriving a linear relational control equation based on the obtained coefficients and optimum control factors; and determining a target adhesion amount of the steel sheet to be covered, substituting a material thickness of the steel sheet and information on width and line speed of the steel sheet for the linear relational control equation, and operating the roll coating according to the circumferential velocity ratios of each rolls and pressures between the rolls that are obtained by the linear relational control equation.
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