Continuous linear substrate infusion
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Solution Overview
Problem
Existing methods for imparting desirable characteristics to polymeric substrates, such as color and weathering resistance, face issues like dye degradation during the manufacturing process and coating weaknesses like cracking or peeling, which affect the integrity and longevity of the final product.
Innovation Solution
A linear substrate infusion system that rapidly infuses active agents, such as dyes, into polymeric substrates at an optimal temperature and time, allowing for the formation of an active agent-infused surface with desired characteristics like color or anti-weathering properties, without the need for physical association during manufacturing or surface coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dye particles are intermixed into melted polymer during manufacturing, then color is imparted to the substrate, but the dye is subjected to melt/cool cycles causing degradation and color alteration
Solution Approach 1:
The patent applies preliminary action by infusing the dye into the polymer substrate before the substrate undergoes melt/cool cycles during manufacturing. This is achieved by immersing the linear substrate in a dye infusion solution at an elevated temperature (above glass transition temperature but below melting temperature) to open polymer chains and facilitate dye penetration, then cooling and drying the substrate before extrusion. This sequence ensures the dye is already embedded in the substrate structure before thermal processing, preventing degradation and color alteration.
2Reliability
If coating is applied to the final article surface, then desirable characteristics like color and weathering resistance are achieved, but the coating is subject to cracking, peeling, and chipping that compromise article integrity
Solution Approach 1:
The patent applies the extraction principle by removing the separate coating step entirely and instead infusing the dye directly into the polymer substrate during or before manufacturing. The dye penetrates the polymer matrix and becomes an integral part of the substrate structure rather than a surface layer. This eliminates the interface between coating and substrate that causes cracking, peeling, and chipping, while still achieving the desired color and weathering resistance characteristics.
3Adaptability or versatility
If coating is applied to achieve flexibility on flexible substrates, then surface characteristics are improved, but achieving sufficient flexibility while maintaining integrity is difficult
Solution Approach 1:
The patent eliminates the separate coating layer that would need to match the substrate's flexibility. Instead, the dye is infused into the polymer substrate itself, becoming part of the flexible matrix. As the substrate bends and flexes, the infused dye moves with it naturally, maintaining integrity without requiring the coating to independently accommodate flexing movements.
4Productivity
If rapid infusion of active agents is implemented, then throughput and manufacturing speed are increased, but process control and infusion uniformity become more challenging
Solution Approach 1:
The patent applies preliminary action by pre-heating the infusion solution to an elevated temperature (e.g., 80-100°C) before contact with the substrate. This preliminary heating opens the polymer chains in advance, creating pathways for rapid dye diffusion. During the brief contact time in the infusion chamber, the heated solution quickly penetrates the substrate, achieving uniform infusion even at high throughput speeds. The process is followed by rapid cooling and drying to lock in the uniform color distribution.
Solution Approach 2:
The patent applies parameter changes by controlling the temperature of the infusion solution and the contact time in the infusion chamber. By maintaining the infusion solution above the glass transition temperature of the polymer, the polymer chains become more mobile and accessible to the dye molecules, dramatically increasing diffusion rates. The contact time is optimized based on substrate material and desired color depth, allowing rapid processing while maintaining uniformity through controlled thermal and temporal parameters.
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 efficient and robust addition of molecules to polymeric substrates, enhancing their color and weathering resistance while maintaining flexibility and integrity, allowing for rapid manufacturing and on-demand adjustments with minimal scrap and improved durability.
Implementation Method 1
contacting the linear substrate with the liquid infusion solution at an infusion temperature and for an infusion time effective to infuse the one or more active molecules into or onto a surface of the linear substrate
Implementation Method 2
infuse the one or more active molecules into or onto a surface of the linear substrate
Data Source
AI summary
A method of forming an active agent infused linear material includes passing a substantially linear polymeric substrate through a linear substrate infusion chamber in a first direction, flowing a liquid infusion solution through the linear substrate infusion chamber in a second direction, and contacting the linear substrate with the liquid infusion solution at an infusion temperature and for an infusion time effective to infuse the one or more active molecules into or onto a surface of the linear substrate, thereby forming an active agent infused linear material. The liquid infusion solution includes one or more active molecules. The second direction is substantially opposite or substantially parallel to the first direction. A linear substrate infusion system and a polymeric linear substrate are also disclosed.