Dye sublimation ready coating for low temperature plastic substrates
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Solution Overview
Problem
Current dye sublimation processes are inefficient for low-temperature plastics and foams, as they deform or break down under typical sublimation temperatures and pressures, leading to poor image quality and durability, and existing coatings are not robust enough to protect these substrates.
Innovation Solution
A dual-layer polymer coating with an IR reflective layer and a light scattering layer, using IR absorbing additives to facilitate quick diffusion of disperse dyes into the light scattering layer while protecting the underlying plastic substrate from IR radiation, allowing for rapid and durable image application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional heat press sublimation is used on low-temperature plastics, then disperse dyes can be transferred to the substrate, but the plastic substrate deforms or breaks down due to high temperatures and pressures
Solution Approach 1:
A polymer coating layer is applied as an intermediary between the disperse dyes and the low-temperature plastic substrate. This coating can withstand higher temperatures and pressures during sublimation, protecting the plastic substrate from direct exposure to harsh conditions while still allowing dye diffusion into its structure.
Solution Approach 2:
The solution uses a composite structure consisting of the polymer coating combined with the plastic substrate. The coating layer provides thermal and mechanical stability during the sublimation process, while the plastic substrate provides the final decorative surface, creating a composite system that overcomes the limitations of either material alone.
2Productivity
If high temperatures and pressures are applied to vaporize disperse dyes, then dye transfer efficiency is improved, but low-temperature plastics cannot withstand these conditions
Solution Approach 1:
The polymer coating serves as a mediator that can endure the high temperatures and pressures required for efficient dye sublimation. It absorbs and distributes the thermal and mechanical stress, preventing direct transmission to the temperature-sensitive plastic substrate while maintaining effective dye transfer conditions.
Solution Approach 2:
The invention changes the thermal and mechanical parameters of the substrate system by adding a coating layer with different properties. This allows the composite structure to withstand higher temperatures and pressures during sublimation than the original plastic substrate could tolerate alone, effectively expanding the processing parameter window.
3Strength
If existing polymer coatings are used on low-temperature plastics, then substrate protection is provided, but the coatings are not robust enough to ensure long-term image persistence
Solution Approach 1:
The patent modifies the coating's physical and chemical parameters by incorporating specific polymer compositions and additives that enhance both protective properties and dye retention. The coating formulation is optimized to provide sufficient durability during sublimation while maintaining long-term image persistence through improved dye diffusion characteristics.
Solution Approach 2:
The solution employs a composite coating formulation combining multiple polymer components and functional additives. This composite structure provides enhanced mechanical strength for substrate protection while simultaneously improving chemical compatibility with disperse dyes for long-term image persistence, addressing both requirements through material composition rather than single-material solutions.
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 the application of vibrant, long-lasting images on low-temperature plastics and foams without altering their original properties, with a processing time significantly shorter than traditional methods, maintaining the substrate's integrity and quality.
Implementation Method 1
a first reflective layer supported by the low temperature plastic substrate that include IR electromagnetic radiation reflecting additives
Implementation Method 2
a second layer supported by the first layer holding light scattering particulate additives
Implementation Method 3
images are transferred from a carrier medium using heat and pressure to activate printed dyes on the medium and causing them to turn into a gas or 'sublimate' from their solid state and to diffuse into a softened polymer matrix
Implementation Method 4
images are transferred from a carrier medium using heat and pressure to activate printed dyes on the medium
Implementation Method 5
a vacuum film is drawn over the plate and the air evacuated around the plate in a sealed space surrounding the plate so that the film applies pressure over the transfer media holding the image against the plate
Data Source
AI summary
It is the object of the present invention to provide a new polymer coating for low temperature plastics and plastic foams that allows for the application of disperse dyes in a sublimation process that preserves the original properties of the underlying plastic substrate. The composition includes an optically clear synthetic organic polymer base holding two layers, a first reflective layer supported by the low temperature plastic substrate that includes IR radiation reflecting additives, and a second layer supported by the first layer having light scattering particulate additives. The disperse dyes utilized in the invention may include additives to absorb IR radiation provided by an external IR source positioned above the disperse dyes causing the dyes to sublimate and diffuse quickly into the light scattering layer. The combination of these layers allows for diffusion of the disperse dye ink into the light scattering layer while protecting the low temperature plastic below.