Absorbent Article Web Cut Detection Using Welding Patterns
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Solution Overview
Problem
Existing methods for controlling the cutting and welding processes in absorbent article manufacturing lack flexibility and are often costly, as they rely on visually detectable features that may not always be available, and require expensive components like thermochromic fibers.
Innovation Solution
A method and apparatus for measuring and detecting welding patterns and cut locations using visual detecting means, such as a CCD camera, to ensure precise cutting by comparing collected images with a set of values, and adjusting process parameters or triggering alarms for corrective measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual detecting means are used to detect welding patterns and cut locations, then measurement precision and manufacturing precision are improved, but device complexity increases
Solution Approach 1:
The patent uses visual detecting means (cameras) to capture images of the welding pattern and cut location on the absorbent article web. These visual copies are then processed to determine cut location accuracy without requiring complex physical measurement devices. The camera system creates optical copies that can be analyzed computationally, simplifying the overall measurement system while maintaining high precision.
Solution Approach 2:
The patent replaces mechanical measurement systems with an optical/electronic system. Instead of using physical sensors or mechanical devices to measure cut location, the system uses visual detecting means to capture images and process them computationally. This substitution reduces mechanical complexity while improving measurement precision and enabling flexible digital analysis of the welding pattern and cut locations.
2Manufacturing precision
If thermochromic fibers are used for process control, then manufacturing precision is improved, but cost increases
Solution Approach 1:
The patent uses visual detecting means to capture images of the welding pattern on the absorbent article. These visual copies allow the system to analyze welding quality and pattern accuracy without requiring expensive thermochromic fibers. The camera system creates optical copies that can be digitally analyzed, providing a cost-effective alternative to expensive thermal sensing materials while maintaining precision in welding pattern control.
Solution Approach 2:
The patent employs standard visual detecting means (cameras) that are significantly cheaper than thermochromic fibers. The system uses readily available optical components and digital processing to achieve the same manufacturing precision at a lower cost. This approach replaces expensive specialized materials with affordable, off-the-shelf components that provide sufficient functionality for process control.
3Adaptability or versatility
If multiple cameras are used for flexible process control, then adaptability is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a single visual detecting means that serves multiple functions: detecting welding pattern characteristics, verifying cut location accuracy, and providing data for process control adjustments. This multi-functional approach eliminates the need for separate dedicated cameras for each measurement task, reducing overall system complexity while maintaining high adaptability and versatility in process control.
Solution Approach 2:
The patent combines multiple detection functions into a single integrated visual detecting system. Instead of using separate cameras for welding pattern detection and cut location verification, the system uses one camera to capture both features simultaneously, processing them through a unified image analysis system. This merging reduces device complexity while maintaining the flexibility and adaptability needed for comprehensive process control.
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 flexible, cost-effective control of the cutting process, ensuring accurate cutting and welding patterns, reducing errors, and allowing for real-time adjustments to maintain product quality.
Implementation Method 1
collecting with visual detecting means (72) an image of the welding pattern (50)
Data Source
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AI summary
The disclosure pertains to a method for measuring and detecting welding patterns and cut locations on a web of absorbent articles (100), said method comprising the steps of: a) bonding at least two substrate layers according to a welding pattern (50) said welding pattern (50) comprising a first welding sub-pattern (54A), a second welding sub-pattern (54B) and a gap (51) in between said first and second welding sub-pattern (54A,54B) ; b) cutting said at least two substrate layers within the welding pattern (50) to separate said web (100) and form discrete absorbent articles (1); c) collecting with visual detecting means (72) an image of the welding pattern (50) to determine the location of the cut made in step b) ; d) processing the image collected in step c) and comparing it against a set of images and/or values, preferably recorded beforehand in a processing unit (78); and e) if said collected and processed image deviates from the set of images and/or values, sending a signal to a control unit (80) which takes corrective measures.