Nanoscale Wound-Healing Microsheets for Scalable Roll-to-Roll Coating
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Solution Overview
Problem
Existing methods for producing molecularly thin polymeric sheets for wound healing are limited to small-scale batch production, which are inefficient and slow, and do not support large-scale manufacturing of microsheets with significant surface areas.
Innovation Solution
A method for large-scale production of nanoscale microsheets involving a flexible substrate with a low surface energy surface and a nanoscale polymer layer, formed by alternating layers of positively and negatively charged polyelectrolytes, optionally incorporating bioactive agents, using techniques like spray coating or roll-to-roll coating, and optionally a second polymer layer to control agent release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If batch production methods are used to produce molecularly thin polymeric sheets, then the sheets can be manufactured with controlled thickness and composition, but the production scale is limited and efficiency is low
Solution Approach 1:
The patent segments the production process into distinct coating stages (spray coating, dip coating, roll-to-roll coating) that can be independently optimized and scaled. The flexible substrate is divided into manageable sections that can be processed continuously through different coating zones, enabling large-scale production while maintaining precise thickness control at each stage.
Solution Approach 2:
The patent applies preliminary surface preparation and priming layers to the flexible substrate before the main polyelectrolyte coating. This preliminary action ensures uniform adhesion and thickness distribution across large substrate areas, enabling scalable production without sacrificing manufacturing precision. The low surface energy surface treatment is performed in advance to prepare the substrate for subsequent coating operations.
2Loss of substance
If batch production methods are used, then reagent usage can be controlled, but the production process is slow and reagent efficiency is low
Solution Approach 1:
The patent implements continuous coating operations where the flexible substrate moves continuously through spray coating, dip coating, and roll-to-roll coating stages. This continuous action eliminates idle time between batch operations and maintains constant reagent application rates, significantly improving production speed while optimizing reagent utilization through steady-state processing conditions.
Solution Approach 2:
The patent employs spray coating technology that uses pneumatic atomization to distribute polyelectrolyte solutions uniformly across the substrate surface. This hydraulic/pneumatic delivery system enables precise reagent placement with minimal waste, while the continuous spray application maintains high production rates without the start-stop nature of batch processing.
3Device complexity
If small-scale batch production is used, then process control is simpler, but the surface area of produced microsheets is limited
Solution Approach 1:
The patent transitions from producing small discrete microsheets to coating large-area flexible substrates that can be rolled out in continuous dimensions. By applying coatings to substrates with areas greater than 0.52 square meters and enabling roll-to-roll processing, the invention extends the surface area dimension while maintaining process control through standardized coating parameters applied across the expanded surface.
Solution Approach 2:
The patent develops a multi-functional coating system that can produce various polyelectrolyte layer configurations (alternating positive/negative charges, different thicknesses, different bioactive agent incorporations) using the same flexible substrate platform and coating infrastructure. This universality allows large-scale production of diverse microsheet products without requiring separate production lines for each variant.
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 efficient large-scale production of flexible microsheets with bioactive agents for wound healing, providing controlled release and enhanced wound healing properties.
Implementation Method 1
the polymer multilayer comprises alternating layers of at least one positively charged polyelectrolyte and at least one negatively charged polyelectrolyte
Implementation Method 2
a flexible substrate comprising a low surface energy surface and having a total surface area of greater than 0.52 square meters
Data Source
AI summary
The present invention relates to large scale manufacture of nanoscale microsheets for use in applications such as wound healing or modification of a biological or medical surface.