Paper Web Marking for Converting Line Control
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Solution Overview
Problem
Current paper manufacturing processes face inefficiencies due to web breaks during the conversion of paper webs into consumer products, leading to reduced productivity and significant losses in paper product output, as existing defect identification and marking methods are either unreliable or heavily reliant on operator skill.
Innovation Solution
A system that includes a paper machine with a web analysis unit for inspecting and marking the paper web with a sequence of marks, allowing for the assignment of action scores or quality scores to each section, which are then used to control the converting line's operational parameters, enabling precise defect identification and prevention of web breaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If web inspection and marking systems are implemented to identify defects, then web break prevention improves, but device complexity increases
Solution Approach 1:
The system performs preliminary defect identification and marking during the papermaking process before the web reaches the converting line. Action scores are calculated and marks are placed on the web in advance, allowing the converting line to prepare appropriate responses (speed reduction, stopping, etc.) before encountering defects, thereby preventing web breaks without requiring complex real-time intervention systems.
Solution Approach 2:
The patent introduces an intermediary marking system that acts as a mediator between the web inspection process and the converting line control. Marks with encoded action scores serve as intermediate signals that convey defect information and required responses, simplifying the communication and control architecture while improving web break prevention.
2Productivity
If real-time defect identification and control is implemented, then productivity is improved, but loss of time for system setup and operation increases
Solution Approach 1:
All defect identification, analysis, and marking operations are performed in advance during the papermaking process. The action scores and corresponding control parameters are calculated and ready before the web reaches the converting line, eliminating setup time and enabling immediate responsive action that maximizes productivity without time losses.
3Reliability
If action scores and operational parameter control are used, then web break prevention improves, but manufacturing complexity increases
Solution Approach 1:
The system uses parameter changes in the form of action scores (numerical values representing defect severity and required response) and corresponding operational parameters (speed, tension, etc.) to control web break prevention. This quantitative approach simplifies the manufacturing process by replacing complex qualitative judgment with standardized parameter adjustment.
Solution Approach 2:
The marking system with encoded action scores serves as an intermediary that translates complex defect characteristics into simple, actionable parameters. This intermediary layer simplifies the manufacturing process by providing clear, quantifiable guidance for converting line operation without requiring complex real-time analysis or judgment.
Data Source
AI summary
A method of producing a paper product by forming a paper web on a paper machine, the web including a plurality of sections, analyzing the web, marking the web, winding the web to form a parent roll after the web has been inspected and marked, assigning an action score to each section of the web, at least one action score having an action value, unwinding a web from a parent roll, reading at least one of a plurality of marks with a mark reading unit, obtaining the action score associated with a second one of the marks, calculating a distance between a mark read by the reading unit and the second one of the marks, changing at least one operational parameter of a converting line based upon the action score of the second of the marks when the distance is less than a threshold, and converting the paper web.