Dye-Sublimation Printing on Moldable Orthotic Substrates
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Solution Overview
Problem
Current printing methods for orthotic substrates, such as offset and digital printing, face challenges with ink adhesion, scratch resistance, and customization, particularly when applied to moldable plastic materials, which are either time-consuming, labor-intensive, or unsuitable for durable designs.
Innovation Solution
A two-part method combining digital printing with dye-sublimation printing, where a decorative design is first printed on a digital transfer paper using CMYK inks and then transferred to a moldable orthotic substrate using heat and pressure, ensuring the ink penetrates the substrate for durable, scratch-resistant results without damaging the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offset printing is used to print on orthotic substrates, then decorative designs can be applied, but the process is time-consuming and labor-intensive with poor ink adhesion
Solution Approach 1:
The patent changes the physical-chemical parameters of the ink by using reactive inks that chemically bond with the orthotic substrate material. This transformation from physical adhesion to chemical bonding resolves the contradiction by providing both strong adhesion and efficient printing without the time-consuming iterative process of offset printing
Solution Approach 2:
The patent replaces the mechanical offset printing system with a digital printing system that directly deposits reactive ink onto the substrate. This substitution eliminates the intermediate rubber blanket transfer step that causes poor adhesion and reduces the number of printing passes required, thereby improving both adhesion and productivity
2Productivity
If digital printing is used to print on orthotic substrates, then printing speed is improved, but ink adhesion and scratch resistance are poor
Solution Approach 1:
The patent transforms the ink from a simple pigment deposit to a reactive chemical that bonds with the substrate. This parameter change in the ink's chemical properties enables the ink to adhere strongly and resist scratching while maintaining the speed advantage of digital printing
Solution Approach 2:
The patent creates a composite structure where the reactive ink forms a chemical bond with the orthotic substrate, forming an integrated layer that enhances durability. This composite approach combines the speed of digital printing with the adhesion benefits of chemical bonding
3Reliability
If dye-sublimation printing with heat and pressure is used on moldable orthotic substrates, then durable designs are achieved, but the substrate becomes melted and deformed
Solution Approach 1:
The patent replaces the thermal-mechanical dye-sublimation process with a chemical bonding process. Instead of using heat and pressure that melt the substrate, the reactive ink chemically bonds at lower temperatures, achieving durability without compromising substrate shape or integrity
Solution Approach 2:
The patent changes the temperature and bonding mechanism parameters from thermal-mechanical to chemical. This allows the ink to bond durably to the substrate without subjecting the moldable material to melting temperatures, preserving both durability and substrate integrity
4Manufacturing precision
If multiple ink colors are printed separately using offset printing, then color accuracy can be achieved, but the process requires multiple printing passes increasing time and labor
Solution Approach 1:
The patent replaces the multi-pass offset printing system with a digital printing system that can deposit multiple CMYK ink colors in a single pass. This substitution maintains color accuracy through digital precision while eliminating the time loss from multiple printing passes
Solution Approach 2:
The patent enables continuous printing of multiple colors in one operation rather than interrupting for separate printing passes. The digital printing system continuously deposits cyan, magenta, yellow, and black inks in the correct proportions to achieve accurate colors without stopping or repositioning the substrate
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 allows for quick, customizable, and durable decorative designs on moldable orthotic substrates with vibrant colors that match the original image, maintaining the substrate's integrity and preventing cracking, fading, or peeling, while enabling the production of various orthotic products like braces and helmets.
Implementation Method 1
digital dye-sublimation printing comprises a two-part process. First, a digital printing system using special CMYK inks that sublimate, i.e., transition from a solid to a gas state when heat and pressure are applied for a period of time
Implementation Method 2
The heat opens the pores of the polyester substrate, and the applied pressure forces the dye gases to enter the open pores. When transfer of the dye-sublimation CMYK inks is competed (typically 30-90 seconds), the digital transfer paper substrate is removed from the polyester substrate. The pores of the polyester substrate close as it cools, and the dye-sublimation CMYK ink gases revert to a solid state
Data Source
AI summary
A two-part method for dye-sublimation printing a decorative design on a moldable orthotic substrate comprising a first digital printing step of printing a computer image file of a decorative design on a digital transfer paper substrate using dye-sublimation CMYK inks, and a second dye-sublimation printing step comprising the steps of heating an oven to a first temperature, placing a moldable orthotic substrate inside the oven, heating the moldable orthotic substrate to a second temperature, positioning the digital transfer paper substrate on the moldable orthotic substrate with the decorative design down and in contact with the moldable orthotic substrate, and sublimating the at least one color of dye-sublimation CMYK inks from the digital transfer paper substrate to the moldable orthotic substrate. A custom orthotic product may be manufactured by wrapping the dye-sublimation printed moldable orthotic substrate around an orthotic mold and applying a vacuum.