Patent ID: 9695550
Date: 2017-07-04
CPC Classifications: D21F,D21G,D21H

Claim:
1. 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, the process for adjusting the papermaking process comprising the steps of: a) providing a first parent roll comprising a first web material to a parent roll converting operation, the first parent roll being produced by the papermaking process; b) measuring a first physical property of the first web material in the MD and CD during the converting of the first parent roll by the parent roll converting operation; c) measuring a second physical property of the first web material in the MD and CD during the converting of the first parent roll by the parent roll converting operation; d) placing the measured first and second physical properties of the first web material into a data table; e) manipulating the measured first and second physical properties of the first web material in the MD from the data table over time; f) manipulating the measured first and second physical properties of the first web material in the CD from the data table over time; g) generating a relationship equation for each of the measured first and second physical properties of the first parent roll correlating each of the first and second physical properties of the first web material; h) providing a second parent roll comprising a second web material to the parent roll converting operation, the second parent roll being produced by the papermaking process; i) measuring the first physical property of the second web material in the MD and CD during the converting of the second parent roll by the parent roll converting operation; j) measuring the second physical property of the second web material in the MD and CD during the converting of the second parent roll by the parent roll converting operation; k) comparing each of the first physical property of the second web material and the second physical property of the second web material to the relationship equation generated in step (g); l) generating a correction for the relationship equation generated in step (g) that correlates each of the first and second physical properties of the second web material; m) using the corrected relationship equation generated in step (l) to create a control algorithm that minimizes variability of either of the first and second physical properties of a third web material, the third web material to be formed into a third parent roll; n) adjusting the papermaking process for producing the third parent roll by applying the control algorithm generated in step (m) to a centerline related to the papermaking process; o) producing the third web material according to the adjusted papermaking process; and, p) winding the third web material produced by the papermaking process of step (o) into the third parent roll.