Web Composition Registration via Vision Feedback
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Solution Overview
Problem
Existing methods for printing on nonwoven and film webs in disposable absorbent articles face challenges in accurately registering compositions with respect to features such as apertures, leading to potential offset and incorrect highlighting of features, which affects the functionality and appearance of the articles.
Innovation Solution
A process that involves creating discontinuities in the web material and using an inspection/print station with a camera and computational device to precisely deposit compositions relative to these discontinuities, ensuring accurate registration and alignment with desired features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional printing methods are used on nonwoven and film webs, then printing operations can occur at normal manufacturing line speed, but the printing may be offset from desired features such as apertures, affecting functionality and appearance
Solution Approach 1:
The patent replaces traditional mechanical printing registration systems with a vision-based optical system. A camera captures images of registration marks on the web, and a computational device processes these images to determine precise web position and orientation. This optical-mechanical substitution enables accurate printing registration at high manufacturing speeds by eliminating the need for complex mechanical positioning mechanisms.
Solution Approach 2:
The patent implements a feedback control system where the vision system continuously monitors the web position through registration marks, and the system adjusts printing operations based on this real-time information. The computational device calculates the web's position and orientation from captured images and provides feedback signals to control the printing process, ensuring accurate registration despite variations in web tension, speed, or positioning.
2Manufacturing precision
If printing is based upon particular features of the article to ensure functional alignment, then accuracy with respect to features is improved, but the system complexity increases due to need for vision systems and registration marks
Solution Approach 1:
The patent introduces registration marks as an intermediary element that facilitates communication between the web and the vision system. These marks serve as reference points that the camera can detect and use to calculate web position and orientation. By using this intermediary, the system achieves precise feature alignment without requiring complex direct sensing of the web itself, simplifying the overall system architecture.
Solution Approach 2:
The vision system creates an optical copy (image) of the registration marks on the moving web. This digital copy is then processed by the computational device to determine precise web positioning information. By working with this copied visual information rather than directly measuring physical dimensions, the system achieves high precision while maintaining simplicity and enabling operation at high manufacturing speeds.
Data Source
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AI summary
A web having compositions applied thereto is disclosed. The web has a plurality of discontinuities. The composition(s) are associated with the discontinuities and can improve fluid acquisition, rewet and/or fluid masking properties of the web.