Elastic Material Application Curved Path Adhesive Resolution
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Solution Overview
Problem
Current methods for applying adhesives and elastic materials in absorbent article manufacturing are limited by the speed of on/off cycling of switching valves, leading to reduced precision and resolution in adhesive patterns as web processing speeds increase.
Innovation Solution
The use of a substrate carrier with a pattern element and a slot die applicator to apply elastic materials in a curved path on an advancing substrate, allowing for precise application of adhesives and other fluids in pre-determined patterns by controlling the lateral position of the elastic material and compressing the pattern surface to deflect and align with the slot die applicator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electro-pneumatic switching valves are used to intermittently transfer adhesive to advancing elastic strands, then adhesive application can be controlled, but the precision and resolution of adhesive patterns deteriorate as web processing speeds increase due to limitations in valve on/off cycling speed
Solution Approach 1:
The patent replaces the electro-pneumatic switching valve system with a mechanical roller-based adhesive transfer system. The roller mechanically picks up adhesive from a reservoir and transfers it to the elastic strands through direct contact, eliminating the need for rapid valve on/off cycling. This mechanical approach maintains precise adhesive pattern resolution even at high web processing speeds because it relies on continuous mechanical contact rather than intermittent valve actuation.
2Manufacturing precision
If electro-pneumatic switching valves are used to control adhesive flow, then adhesive transfer can be interrupted, but the ability to achieve fine resolution in the direction of web travel is limited by valve cycling speed
Solution Approach 1:
The patent replaces the valve-based flow control system with a mechanical roller system that controls adhesive transfer through physical contact and rotation. The roller's rotation speed and pressure against the elastic strands determine the adhesive application rate and pattern resolution, allowing for precise control independent of web processing speed. This mechanical substitution enables fine resolution adhesive patterns to be achieved at high speeds because the roller can maintain consistent contact and transfer adhesive continuously without the latency limitations of valve cycling.
3Productivity
If slot die coating processes are used to apply adhesives, then continuous adhesive application is possible, but control over intermittent transfer and pattern resolution is reduced
Solution Approach 1:
The patent applies local quality by using a roller that selectively transfers adhesive only to specific locations on the elastic strands. The roller contacts the strands at defined points, creating localized adhesive application zones. This allows continuous adhesive supply from the reservoir while achieving precise intermittent transfer control at the application point, combining the benefits of continuous feeding with patterned deposition.
Solution Approach 2:
The patent introduces dynamics through the rotating roller system, which can vary its rotation speed and contact pressure to dynamically control adhesive transfer. The roller rotates continuously to receive adhesive from the reservoir, then intermittently contacts the elastic strands to transfer adhesive in controlled amounts. This dynamic mechanical system provides both continuous adhesive availability and precise intermittent application control, overcoming the static limitations of fixed slot die configurations.
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 enables high-resolution and high-speed application of adhesives and elastic materials, improving the precision and quality of adhesive patterns without being limited by the speed of switching valves, enhancing the manufacturing efficiency of absorbent articles.
Implementation Method 1
compressing the pattern surface to deflect and align with the slot die applicator
Implementation Method 2
compressing the pattern surface to deflect and align with the slot die applicator
Implementation Method 3
moving the elastic material in a cross direction substantially transverse to the machine direction
Data Source
AI summary
Aspects of the methods and apparatuses relate to making elastic laminates, and more particularly, methods and apparatuses for applying elastic material in a curved path onto an advancing substrate. The elastic material may be in various forms, such as for example, elastic strands and/or ribbons. Apparatuses and methods disclosed herein may also provide for the application of viscous fluids, such as adhesives, in pre-determined patterns to the elastic material while being positioned on an advancing substrate.