Methods of applying compositions to webs
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Solution Overview
Problem
Existing methods for printing on disposable absorbent articles face challenges in accurately aligning prints with specific features, such as apertures, due to offsets in the machine direction and cross-machine direction, which can impact functionality and incorrectly highlight features.
Innovation Solution
A non-contact printing system that detects features on a web using an inspection/print station, allowing for the precise deposition of composition sites based on pre-rendered patterns that correlate with detected features, enabling registration, offset, or partial overlap with intermediate features and discontinuities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional contact printing methods are used, then printing can be performed on the web, but alignment accuracy with specific features deteriorates due to offsets in machine direction and cross-machine direction
Solution Approach 1:
The patent replaces conventional contact printing mechanisms with non-contact printing technology, specifically inkjet printing. This substitution eliminates mechanical contact and associated alignment errors, allowing precise deposition of composition sites directly onto detected features like apertures without the offsets inherent in mechanical printing systems
Solution Approach 2:
The system incorporates a vision system that detects features on the web in real-time and provides feedback to control the printing process. This closed-loop feedback mechanism allows the system to dynamically adjust printing positions to ensure accurate alignment with detected features, compensating for any web movement or positioning variations
2Productivity
If printing is offset to accommodate manufacturing variations, then the entire print design can be applied, but the print design appears out of tolerance with respect to the article features
Solution Approach 1:
The system transitions from static, pre-programmed printing positions to dynamic, real-time position adjustment. The vision system continuously detects feature locations and the control system dynamically adjusts printing positions accordingly, enabling accurate print registration even as manufacturing conditions vary during operation
Solution Approach 2:
The system changes the printing parameters (position, timing) based on real-time detection data. Instead of maintaining fixed printing parameters, the system dynamically modifies these parameters to match the actual positions of features on the web, ensuring accurate alignment throughout the manufacturing process
3Manufacturing precision
If non-contact printing is implemented to improve alignment accuracy, then composition sites can be precisely deposited, but the system complexity increases
Solution Approach 1:
The system integrates multiple functions into a unified platform: the vision system serves both inspection and positioning functions, while the inkjet printing system handles both deposition and precise positioning. This multi-functionality reduces overall system complexity compared to having separate systems for each function
Data Source
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AI summary
A method of printing composition(s) on a web is disclosed. The method includes the steps of advancing the web and printing a plurality of composition sites on the web. The method further includes the step of forming one or more discontinuities in the web. The discontinuities correspond to the printed composition sites.