Extrusion application system
First Claim
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1. A method of extruding a controlled amount of a non-Newtonian fluid from a source of the non-Newtonian fluid, through a chamber of an applicator to a nozzle of the applicator, and through the nozzle of the applicator onto a substrate moving relative to the nozzle, comprising:
- applying a predetermined pressure to the non-Newtonian fluid at a known temperature;
extruding the controlled amount of the non-Newtonian fluid, subject to the predetermined pressure, via an extrusion pathway through the chamber to the nozzle and through the nozzle onto the moving substrate; and
redirecting a portion of the non-Newtonian fluid along a return pathway, independent of the extrusion pathway, from the chamber of the applicator to the source of the non-Newtonian fluid during extrusion of the controlled amount of non-Newtonian fluid in the extrusion step,wherein the predetermined pressure is based on empirical correlations of pressure applied to a calibration fluid, speed of a substrate relative to a nozzle during extrusion of the calibration fluid, and an amount of the calibration fluid extruded during an empirical data acquisition process performed independently of the extruding step.
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Abstract
A machine and a method of applying a non-Newtonian liquid composition onto a surface in a controlled manner. The composition is held in a chamber at a controlled variable pressure and is dispensed through a slit die nozzle as controlled by a valve. Characteristics of the composition are empirically developed and provided to a logic control circuit to assure that the composition is dispensed on either the entire surface or in one or more precise locations.
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Citations
16 Claims
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1. A method of extruding a controlled amount of a non-Newtonian fluid from a source of the non-Newtonian fluid, through a chamber of an applicator to a nozzle of the applicator, and through the nozzle of the applicator onto a substrate moving relative to the nozzle, comprising:
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applying a predetermined pressure to the non-Newtonian fluid at a known temperature; extruding the controlled amount of the non-Newtonian fluid, subject to the predetermined pressure, via an extrusion pathway through the chamber to the nozzle and through the nozzle onto the moving substrate; and redirecting a portion of the non-Newtonian fluid along a return pathway, independent of the extrusion pathway, from the chamber of the applicator to the source of the non-Newtonian fluid during extrusion of the controlled amount of non-Newtonian fluid in the extrusion step, wherein the predetermined pressure is based on empirical correlations of pressure applied to a calibration fluid, speed of a substrate relative to a nozzle during extrusion of the calibration fluid, and an amount of the calibration fluid extruded during an empirical data acquisition process performed independently of the extruding step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification