Back to results
US 2022/0324136 A1Published application
Inline extrudate bow measurement and control
AssigneeCorning Incorporated
InventorsJoseph Henry Citriniti, Rodney Gene Dunn, David Robert Potts, Paul Edward Washburn
Life of this patent
Estimating the term…
Abstract
Extrusion techniques for reducing bow of an extrudate formed from a ceramic forming mixture. Velocities of an outer surface of the extrudate are measured at a plurality of peripherally spaced measurement locations. The velocities are compared to determine whether there is a velocity bias, and the comparison is used to selectively alter the flow of the ceramic forming mixture.
Claims23
An apparatus to reduce bow of an extrudate, the apparatus comprising:
- an extrusion die defining a portion of a flow path of a ceramic forming mixture between an inlet face and a discharge face, wherein the ceramic forming mixture exiting the discharge face forms the extrudate;
- a measurement device configured to measure a first velocity of an outer surface of the extrudate at a first location and a second velocity of the outer surface of the extrudate at a second location peripherally spaced from the first location and to generate first velocity data representative of the first velocity and second velocity data representative of the second velocity;
- a flow control device disposed along the flow path of the ceramic forming mixture at a location upstream of the extrusion die, the flow control device controllable by control signals;
- and
- a controller configured to compare the first velocity data to the second velocity data, to generate a control signal based at least in part on a magnitude of a difference between the first velocity data and the second velocity data being greater than or equal to a predetermined threshold, and to communicate the control signal to the flow control device.
2 more elements
17-22. (canceled)
A method for controlling bow of an extrudate, comprising:
- forcing a ceramic forming mixture to flow through an extrusion die to form the extrudate extending along an extrudate flow path;
- and
- controlling a flow control device based at least in part on whether a magnitude of a difference between a first velocity of an outer surface of the extrudate at a first location proximate to a discharge face of the extrusion die and a second velocity of the outer surface of the extrudate at a second location proximate to the discharge face of the extrusion die and peripherally spaced from the first location is greater than or equal to a predetermined threshold target value.
(canceled)
28-30. (canceled)
Dependencies are inferred from the claim text.