Web Substrate Color Activation Aligned With Deformed Regions
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Solution Overview
Problem
Manufacturers of absorbent articles face challenges in cost-effectively producing web substrates with colored regions that coincide with mechanically deformed regions without requiring additional printing or registration capabilities, as existing methods are complex and costly, especially on high-speed manufacturing lines.
Innovation Solution
A method involving a web substrate with an activatable colorant that changes color in response to external stimuli, where the colorant is first activated by electromagnetic radiation and then by heat induced by mechanical deformation, creating second activated color regions that coincide with deformed regions, eliminating the need for additional printing or registration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printing capability is added to the manufacturing process to highlight deformed regions, then colored regions can be produced that coincide with deformed regions, but capital cost and manufacturing complexity increase significantly
Solution Approach 1:
The patent applies color-changing materials (thermochromic or photochromic compounds) that change color in response to external stimuli such as heat or light. The web substrate includes a first region that changes color under a first stimulus and a second region that changes color under a second stimulus, allowing visual differentiation of deformed regions without requiring precise printing registration. This eliminates the need for complex printing equipment while achieving the desired visual effect.
Solution Approach 2:
The patent replaces the mechanical printing system with a stimulus-responsive color change system. Instead of using printing equipment to apply color to specific regions, the invention uses materials that automatically change color in response to physical or chemical stimuli, thereby substituting a complex mechanical system with a simpler material-based solution.
2Manufacturing precision
If additional printing and registration capabilities are installed on the manufacturing line, then colored regions can be produced coinciding with deformed regions, but capital cost increases significantly
Solution Approach 1:
The patent uses color-changing materials that respond to external stimuli to create visual differentiation between regions. The first region contains a color-changing compound that responds to a first stimulus (e.g., heat from deformation), while the second region responds to a different stimulus (e.g., UV light). This approach achieves precise visual alignment with deformed regions without requiring expensive printing and registration equipment.
Solution Approach 2:
The web substrate performs the function of indicating deformed regions through self-responsive color changes. The material itself provides the visual information about deformation through its stimulus-responsive properties, eliminating the need for external printing systems to provide this information.
3Manufacturing precision
If the manufacturing line is retooled to provide printing and registration capabilities, then colored regions can be produced coinciding with deformed regions, but production time and complexity increase
Solution Approach 1:
The patent implements a system where color changes occur automatically in response to stimuli during or after the deformation process. The web substrate includes regions with different color-changing compounds that respond to different stimuli, allowing visual identification of deformed areas without requiring additional printing steps that would slow down production.
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
This method allows for the cost-effective production of absorbent articles with visually distinct deformed regions, enhancing perception of absorbency and comfort without incurring significant capital costs for new manufacturing line setups.
Implementation Method 1
The activatable colorant can have both photoreactive and thermochromic material properties such that it first changes color to a first color upon exposure to electromagnetic radiation such as ultraviolet light
Implementation Method 2
The activatable colorant can have both photoreactive and thermochromic material properties such that it first changes color to a first color upon exposure to electromagnetic radiation such as ultraviolet light and then changes to a second color upon exposure to heat
Implementation Method 3
The heat is preferably induced by strain associated with mechanical deformation during formation of the deformed regions
Data Source
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AI summary
The present invention relates to a method of producing activated color regions in a web substrate where activated color regions are formed coinciding with deformed regions. The method includes providing a web substrate having an activatable colorant and producing a first activated color region therein. The web substrate is mechanically deformed to produce at least one deformed region in the first activated color region such that a second activated color region is produced coinciding with the at least one deformed region.