Method and apparatus for monitoring and controlling the application of performance enhancing materials to creping cylindersto improve process
The invention provides methods and compositions for monitoring and controlling the thickness of coating on a creping cylinder is disclosed. The methodologies involve a coordinated scheme of apparatuses that function to monitor various aspects of a creping cylinder coating so that the thickness of the coating can be determined.
1. A method of monitoring and optionally controlling the application of a coating containing a Performance Enhancing Material (PEM) on a surface of a creping cylinder comprising:
(a) applying a coating to the surface of the creping cylinder;
(b) determining if a thickness of the coating is sufficiently non-uniform so as to exceed a threshold known to cause blade chatter by measuring the thickness of the coating on the surface of the creping cylinder by a differential method, wherein said differential method utilizes a plurality of apparatuses that do not physically contact the coating, wherein the plurality of apparatuses includes at least one apparatus selected from the group consisting of an IR-temperature sensor, a spectrometer, an inferometer, an ultrasonic sensor, a moisture measuring device, and a modulus measuring device;
(c) adjusting the application of said coating in one or more defined zones of said creping cylinder in response to the thickness of said coating so as to provide a uniform thick coating on the surface of the creping cylinder; and
(d) applying an additional device(s) to monitor and optionally control other aspects of the coating on the creping cylinder aside from the thickness of the coating.
2. The method of claim 1 wherein the plurality of apparatuses includes at least one additional apparatus selected from the list consisting of: eddy current sensor, optical displacement sensor, capacitance sensor, thickness measuring device, and any combination thereof.
3. The method of claim 1 , further comprising:
applying a capacitance probe to measure the moisture content of the coating to determine a capacitance measurement;
comparing the capacitance measurement with the differential method measurement to determine the effect of moisture on the coating thickness; and
optionally adjusting the amount and distribution of the coating on the creping cylinder surface in response to the effect moisture has on thickness as determined by the differential method.
4. A method of monitoring and optionally controlling the application of a coating containing a Performance Enhancing Material (PEM) on a surface of a creping cylinder wherein the cylinder rotates in a machine direction and a crepe blade is engaged to the cylinder, the method comprising:
(a) applying a coating to the surface of the creping cylinder;
(b) measuring the coating using a non-contact measurement;
(c) determining if a thickness of the coating is sufficiently non-uniform so as to exceed a threshold known to cause blade chatter by measuring the thickness of the coating on the surface of the creping cylinder by a differential method; and
(d) adjusting the application of said coating in one or more defined zones of said creping cylinder in response to the thickness of said coating.
5. The method of claim 4 , wherein the differential method is a non-contact measurement on the applied coating.
6. The method of claim 4 wherein the non-contact measurement is carried out using a member selected from the list consisting of an eddy current sensor, an optical displacement sensor, a capacitance sensor, an IR-temperature sensor, a spectrometer, an inferometer, a triangulation device, an ultrasonic sensor, a moisture measuring device, a thickness measuring device, a modulus measuring device, a laser triangulation sensor, a chromatic type confocal sensor, and any combination thereof.
7. The method of claim 4 , wherein the tissue web and the coating are adjusted to prevent chatter.