Micro-aberration Formation on Molten Polymer Web
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Solution Overview
Problem
Current methods for forming three-dimensional aspects on thin polymeric films used in absorbent devices are limited by the need for high pressure, which can cause equipment deflection and disruption, and reheating destroys micro-aberrations formed in prior steps, preventing the achievement of desired micro-aberration heights and aperture formation.
Innovation Solution
A single-step process involving a molten polymer web engaged between a screen with positive aberrations and a roller with negative depressions, using low pressure (1.5 to 3.5 PLI) to form micro-aberrations and apertures without reheating, where the roller is positioned at the leading edge of a vacuum slot to prevent deflection and maintain air flow for aperture formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high pressure is used to form three-dimensional aspects on thin polymeric films, then the micro-aberration height can be increased, but equipment deflection and deformation occur
Solution Approach 1:
The patent changes the pressure parameter from high pressure to low pressure (1.5 to 3.5 PLI) while simultaneously changing the roller diameter parameter to small (no more than 5.5 inches). This parameter combination allows formation of micro-aberrations with heights of 30 µm to 200 µm without causing equipment deflection or deformation, resolving the contradiction between achieving sufficient micro-aberration height and maintaining equipment structural integrity
Solution Approach 2:
The patent introduces the dimension of roller diameter as a critical parameter. By using a small diameter roller (no more than 5.5 inches) positioned at the leading edge of the vacuum slot, the system achieves the desired micro-aberration heights without requiring high pressure, thus avoiding equipment deformation while still achieving the manufacturing precision goal
2Manufacturing precision
If high pressure is used to form three-dimensional aspects on thin polymeric films, then the micro-aberration height can be increased, but aperture formation is disrupted
Solution Approach 1:
The patent segments the formation process into two distinct zones: a first zone with low pressure for forming micro-aberrations, and a second zone with vacuum for forming apertures. This segmentation allows each process to occur under optimal conditions without interfering with the other, achieving both micro-aberration height and reliable aperture formation
Solution Approach 2:
The patent performs preliminary action by forming micro-aberrations in the first zone before aperture formation occurs in the second zone. The small diameter roller positioned at the leading edge of the vacuum slot creates micro-aberrations first, then the vacuum slot forms apertures subsequently, ensuring both features are achieved without disruption
3Stability of the object's composition
If the roller diameter is increased to reduce deflection, then equipment stability improves, but air flow for aperture formation is blocked
Solution Approach 1:
The patent optimizes the roller diameter parameter to a specific range (no more than 5.5 inches) that simultaneously provides sufficient stability for micro-aberration formation while maintaining adequate air flow for aperture formation. This parameter optimization resolves the contradiction between roller stability and aperture formation efficiency
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 process enables the formation of micro-aberrations with average heights of 30 µm to 200 µm and apertures on thin polymeric films, maintaining structural integrity and achieving desired tactile and aesthetic properties without equipment deformation.
Implementation Method 1
passing the molten polymer web with the micro-aberration beyond the leading edge of the vacuum slot such that the vacuum slot pulls portions of the polymer web into one or more openings included in the screen via a pressure differential
Data Source
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AI summary
Systems ans methods for forming a vacuum formed, apertured film (50) with micro-aberrations (52) may be disclosed. For example, a polymer web such as a molten polymer web (10) may be received at an engagement point (40) between a screen (22) with a positive aberration and a roller (32) comprising a surface with a negative depression. The roller (32) may have a diameter of no more than about 5.5 inches. A micro-aberration (52) may be expanded, for example, on a land of the polymer web at the engagement point (40) by inserting the positive aberration on the screen (20) into the negative depression on the surface of the roller (32) at a pressure of about 1.5 to about 3.5 pounds per linear inch (PLI). Additionally, one or more apertures are formed in the polymer web (10) adjacent to a micro-aberration (52) on a land.