Process to improve the convertability of parent rolls

摘要

The present disclosure is directed toward a process for adjusting a papermaking process for producing parent rolls of convolutely wound web material having a machine direction (MD) and a cross-machine direction (CD) coplanar and orthogonal thereto that improves the characteristics of the parent rolls of wound web material to improve downstream convertability.

主权项

1. Process for adjusting a papermaking process for producing parent rolls of convolutely wound web material having a machine direction (MD) and a cross-machine direction (CD) coplanar and orthogonal thereto that improves the characteristics of the parent rolls of wound web material to improve downstream convertability, the process for adjusting the papermaking process comprising the steps of:
a) conveying the web material produced by the papermaking process to a measurement station; b) measuring or inferring a first plurality of a first physical property of the web material in the MD and CD prior to forming the parent roll; c) measuring or inferring a first plurality of a second physical property of the web material in the MD and CD prior to forming the parent roll; d) conveying the web material to a winding process, the winding process convolutely winding the web material to form the parent roll; e) placing the first pluralities of measured or inferred data of the first and second physical properties of the web material into a data table; f) manipulating the measured or inferred data for each of the first pluralities of first and second physical properties of the web material in the MD from the data table over time; g) detecting anomalous measured or inferred data for each of the first pluralities of first and second physical properties of the web material; h) discarding outlying measured or inferred data for each of the first pluralities of first and second physical properties of the web material; i) manipulating the measured or inferred data for each of the first and second physical properties of the web material in the CD from the data table over time; j) generating a relationship equation for each of the averaged measured or inferred first and second physical properties of the web material correlating each of the first and second physical properties of the web material and web material stretch; k) measuring a second plurality of the first physical property of the web material in the MD and CD prior to forming the parent roll; l) measuring a second plurality of the second physical property of the web material in the MD and CD prior to forming the parent roll; m) comparing each of the second pluralities of the first physical property of the web material and second physical property of the web material to the relationship equation generated in step (j); n) generating a correction for the relationship equation generated in step (j) that correlates web material stretch to the each of the first and second physical properties of the web material; o) using the corrected relationship equation generated in step (n) to create a control algorithm that minimizes variability of either of the first and second physical properties of the web material; p) adjusting the papermaking process by applying the control algorithm generated in step m) to a centerline related to the papermaking process; q) producing the web material according to the adjusted papermaking process; and, r) winding the web material produced by the papermaking process of step (q) into said parent roll of said convolutely wound web material.