Curved Microstructured Thermoplastic Surfaces With Integrated Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Achieving strong interfacial adhesion between microstructures and other portions of an article, particularly in curved surfaces, is challenging, and existing microstructured surfaces are difficult to clean effectively.
Innovation Solution
A microstructured article is formed using a single piece of thermoplastic polymer with a curved surface, featuring peak structures and adjacent valleys, where at least 30-90% of the structures have a slope greater than 10 degrees and less than 80% have a slope greater than 35 degrees, created through thermoforming with a microstructured film on a tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a microstructured surface is applied to reduce microorganisms, then cleaning efficiency is improved, but interfacial adhesion between microstructures and other portions of the article deteriorates
Solution Approach 1:
The microstructured surface and the base article are formed as a single integrated piece using thermoplastic polymer, eliminating the interface between separate components. This merging approach resolves the adhesion problem by removing the interfacial weakness that would exist between separately applied microstructures and the article substrate.
Solution Approach 2:
The patent specifies precise slope angle parameters for the microstructures (at least 30-90% of structures have slope greater than 10 degrees, less than 80% have slope greater than 35 degrees). By controlling these geometric parameters during thermoforming, the microstructures achieve optimal performance for microorganism reduction while maintaining structural integrity with the base material.
2Object-affected harmful factors
If microstructured surfaces are used to reduce microorganisms, then cleaning efficiency is improved, but the complexity of manufacturing curved surfaces deteriorates
Solution Approach 1:
The patent utilizes the phase transition of thermoplastic polymer from solid to molten state during thermoforming. The polymer is heated above its melting point, allowing it to flow and conform to the microstructured tooling surface, then cooled to solidify with the desired microstructure. This phase transition enables complex curved surfaces with microstructures to be manufactured in a single process step.
Solution Approach 2:
The microstructured surface is created by copying the inverse microstructure from the tooling surface onto the thermoplastic article during thermoforming. The tooling surface serves as a master template, and the molten polymer replicates its microstructure, enabling consistent production of complex curved surfaces with precise geometric control.
3Object-affected harmful factors
If microstructured surfaces with high slope angles are used to improve cleaning efficiency, then microorganism reduction is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges for slope angles that balance cleaning efficiency with manufacturability. By specifying that at least 30-90% of structures have slope greater than 10 degrees but less than 80% have slope greater than 35 degrees, the patent optimizes the microstructure geometry to achieve effective microorganism reduction while remaining feasible for thermoforming manufacturing.
Solution Approach 2:
Rather than requiring all microstructures to have uniformly high slope angles (which would be difficult to manufacture), the patent allows a distribution of slope angles across the population of structures. This partial approach—where not all structures need maximum slope—maintains cleaning effectiveness while significantly easing manufacturing precision requirements.
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
The microstructured surface provides a log 10 reduction of microorganisms like bacteria after cleaning, improving cleaning efficiency and adhesion, and can be applied to various articles including medical, dental, and vehicular components.
Implementation Method 1
A microstructured article is provided. The microstructured article comprises a thermoplastic polymer shaped to comprise a curve
Implementation Method 2
Certain articles with microstructured surfaces have been demonstrated to provide a reduction of microorganism (e.g., bacteria) after cleaning
Data Source
AI summary
The present disclosure provides a microstructured article including a thermoplastic polymer shaped to have a curve. At least a portion of the curve includes a microstructured surface of utilitarian discontinuities and the microstructured surface includes peak structures and adjacent valleys. The peak structures and the curve are formed of a single piece of the thermoplastic polymer. A method of making the microstructured articles is also provided including a) obtaining a tool shaped to include at least one of a protrusion or a concavity; b) disposing a microstructured film on at least a portion of the tool including the protrusion and/or the concavity; and c) thermoforming a single piece of thermoplastic polymer onto the tool to form a microstructured article shaped to include a curve. The curve is an inverse of the protrusion or the concavity of the tool.