Web Material Defect Detection and Rejection on Conversion Lines
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Solution Overview
Problem
Current systems fail to reliably detect and separate defective sections of web material in real-time on high-speed conversion lines, leading to economic losses due to wastage and contamination, as they are cumbersome, complex, and often require manual intervention or modification of machines.
Innovation Solution
A defects management device comprising a detection unit and a control unit that identifies defective sections of web material using sensors and image processing, communicates with the conversion line control to separate defective pieces from the process flow, and directs them to a rejects collection zone without stopping the advancing web material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical inspection is performed by operating personnel, then defect detection is possible, but it becomes virtually impossible at high web conveying rates of up to 300 m/min
Solution Approach 1:
The patent replaces manual optical inspection with an automated optical inspection system using sensors and image processing. The system captures images of the web material at high conveying rates and automatically detects defects through digital image analysis, eliminating the limitation of human inspection speed while maintaining defect detection capability.
Solution Approach 2:
The system creates optical copies (images) of the web material surface and analyzes these copies to detect defects. By working with image data rather than direct visual inspection of the moving web, the system can process information at high speeds without being constrained by human reaction time or visual acuity limits.
2Reliability
If conventional defect detection systems are implemented, then defects can be detected, but the systems are cumbersome, complex, and require manual intervention or machine modification
Solution Approach 1:
The inspection system is designed to be integrated into existing conversion lines without requiring fundamental machine modifications. The system serves multiple functions including defect detection, defect classification, and triggering of rejection mechanisms, while being adaptable to different web material types and defect characteristics, thereby reducing complexity through multi-functionality.
Solution Approach 2:
The system automatically processes detected defects through integrated control that triggers rejection mechanisms without requiring manual intervention. The automated decision-making and actuation processes eliminate the need for operator involvement in defect handling, simplifying operation while maintaining high reliability.
3Productivity
If defective web material is not rejected in real-time, then production continuity is maintained, but economic losses occur due to wastage and contamination
Solution Approach 1:
The system performs preliminary detection and rejection of defective web material sections before they enter downstream processing. By identifying and removing defects early in the production flow, the system prevents contamination and wastage that would occur if defective material proceeded through filling and packaging operations, thereby protecting both productivity and material efficiency.
Solution Approach 2:
The system extracts defective sections from the continuous web material flow and directs them to rejection mechanisms. This separation allows the majority of good material to continue through production uninterrupted, maintaining productivity while removing only the problematic portions that would cause wastage or contamination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient detection and separation of defective web material sections, reducing wastage and maintaining continuous production by identifying and cutting out defects before they enter downstream processing, thus ensuring product quality and minimizing economic losses.
Implementation Method 1
a defects detection unit (4), and a defects management control unit (5) which monitor progress of the defect on the traveling web material (1)
Data Source
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AI summary
The invention relates to a device for managing defects in a web material on conversion lines. In particular, the device relates to identifying defective sections of web/web material and rejecting the defective pieces before they enter the downstream processes of a conversion line, such as bag making. In a key aspect of the invention, the defects management device comprises a defects detection unit (3), and a defects management control unit (5) which monitor progress of the defect on the traveling web material (1)and subsequently identifies the section of the of web material containing the defect to be cut, the defects management control unit also communicates with the control unit of the conversion line to operate selectively the cutting unit that cuts the web material into pieces. A method to manage defects in web material comprising the steps of detecting defects in web material, identifying web material piece/section containing defect and rejecting it from the production line it is also disclosed.