Batch mixing method with standard deviation homogeneity monitoring
First Claim
1. A method of formulating a composition having a predetermined volume comprising two or more chemicals each chemical being present in the composition in a predetermined quantity, the method comprising:
- admitting at least two chemicals into a container to form a composition until the container is partially filled to a predetermined fraction of the predetermined volume;
blending the composition in the container;
determining the homogeneity of the blended composition;
continuing blending of the composition until the homogeneity of the composition is at least at a predetermined homogeneity value;
determining the quantity of each chemical needed to fill the container to the predetermined volume, or to a selected volume between the volume of the partially filled container and the predetermined volume, after the homogeneity of the composition is at least at a predetermined homogeneity value, wherein the quantity of each chemical is calculated as a function of the determined quantity of one or more of the chemicals in the composition; and
dispensing the determined quantity of the chemicals to the container;
wherein the homogeneity is determined as a function of an average deviation of the quantity of one or more chemicals of the composition with respect to an average quantity of the chemicals of the composition over a predetermined time period.
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Accused Products
Abstract
There is disclosed a system and method of formulating a batch comprising at least two chemicals. An embodiment is disclosed wherein a feedforward algorithm can be used to control the target blend. Subsequently a feedback closed loop control loop algorithm is provided for a multivariant blend. Use of this approach allows for a continuously autoreplenished and controlled blend. Also disclosed is the ability to control via feedforward and feedback algorithms a fast responding control mode that allows for the elimination of a container. This approach will allow for “one pass” blending with control. The controller implements an automated fault detection and correction system, thereby identifying necessary maintenance prior to failure. If failure does occur the signature recognition allows rapid analysis and correction thus maximizing tool availability.
86 Citations
22 Claims
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1. A method of formulating a composition having a predetermined volume comprising two or more chemicals each chemical being present in the composition in a predetermined quantity, the method comprising:
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admitting at least two chemicals into a container to form a composition until the container is partially filled to a predetermined fraction of the predetermined volume; blending the composition in the container; determining the homogeneity of the blended composition; continuing blending of the composition until the homogeneity of the composition is at least at a predetermined homogeneity value; determining the quantity of each chemical needed to fill the container to the predetermined volume, or to a selected volume between the volume of the partially filled container and the predetermined volume, after the homogeneity of the composition is at least at a predetermined homogeneity value, wherein the quantity of each chemical is calculated as a function of the determined quantity of one or more of the chemicals in the composition; and dispensing the determined quantity of the chemicals to the container; wherein the homogeneity is determined as a function of an average deviation of the quantity of one or more chemicals of the composition with respect to an average quantity of the chemicals of the composition over a predetermined time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification