Absorbent article
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Solution Overview
Problem
Current printing methods for absorbent articles, such as sanitary napkins and diapers, lack precision and synchronization in applying skin beneficial agents and additives, particularly in aligning patterns and ensuring accurate placement of detectable agents for further processing.
Innovation Solution
A method using a rotary printing device with two chambers supplying different compositions to the same anilox roller, where one composition includes skin beneficial agents and the other a detectable agent forming a sync mark, allowing for precise alignment and synchronization during the production of absorbent articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single printing device is used to apply multiple compositions, then device complexity is reduced, but manufacturing precision deteriorates due to inability to provide different compositions simultaneously with accurate alignment
Solution Approach 1:
The printing device is segmented into multiple chambers (first chamber for first composition, second chamber for second composition with detectable agent) that feed into a shared anilox roller. This segmentation allows each chamber to independently control its composition while maintaining synchronization through the common roller, resolving the contradiction between device simplicity and printing precision.
Solution Approach 2:
Multiple composition delivery systems are merged into a single anilox roller and printing cylinder system. The first and second chambers both supply their respective compositions to the same anilox roller, which then transfers both patterns to the material in precise registration, combining multiple functions into a unified printing mechanism.
2Productivity
If detectable agents are printed without synchronization markers, then printing speed increases, but measurement precision deteriorates due to inability to accurately detect pattern position for further processing
Solution Approach 1:
A detectable agent (such as UV-fluorescent material) is introduced as an intermediary marker that can be easily detected by sensors or cameras during inline processing. This intermediary element enables precise measurement of pattern position without slowing down the printing process, as the detectable agent provides clear optical signals for synchronization detection.
Solution Approach 2:
The detectable agent utilizes optical properties (such as UV fluorescence or visible light emission) that change or stand out from the background material. This optical contrast allows sensors to accurately detect the position and alignment of printed patterns in real-time during high-speed production, maintaining both productivity and measurement precision.
3Manufacturing precision
If edges of the material are retained for synchronization purposes, then manufacturing precision improves, but loss of substance increases due to subsequent removal of non-essential edges
Solution Approach 1:
The synchronization function is extracted from the material edges and transferred to the detectable agent printed on the material surface. By removing the dependency on edge material for synchronization, the actual functional edges remain intact and useful, eliminating the need to cut or remove material edges while maintaining precise alignment capability.
Solution Approach 2:
Instead of using the physical material edges for synchronization, a replicated signal (the detectable agent pattern) is created on the material surface. This copied synchronization marker provides the same alignment function as edge markers would, but without requiring material removal or creating waste, as the detectable agent is integrated into the printed design itself.
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 accurate placement and synchronization of patterns and additives, facilitating the removal of non-essential edges and ensuring the correct positioning of beneficial agents, thereby enhancing the manufacturing efficiency and user benefits of absorbent articles.
Implementation Method 1
the first composition from the first chamber and the second composition from the second chamber are supplied to the same anilox roller or directly to the same rotary printing cylinder; and printing the first and second compositions on the material for an absorbent article by a rotary printing cylinder
Implementation Method 2
The second composition may comprise a detectable agent that emits light in the UV or visible light spectra
Implementation Method 3
The detectable agent may be detected by means of a sensor or camera
Data Source
AI summary
A method for alignment of a pattern printed on a material for an absorbent article by a rotary printing device, including providing a first composition from a first chamber; providing a second composition including a detectable agent from a second chamber; wherein the first composition from the first chamber and the second composition from the second chamber are supplied to the same anilox roller or directly to the same rotary printing cylinder; and printing the first and second compositions on the material for an absorbent article by a rotary printing cylinder.