Water-Based Polychromatic Heat Transfer Labels for Wash Durability
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Solution Overview
Problem
Existing heat transfer labels with reflective polychromatic effects suffer from poor wash-fastness, dye migration, and environmental concerns, particularly when using solvent-based inks.
Innovation Solution
A heat transfer label with a polychromatic effects design layer formulated from a water-based ink containing 1-25% polychromatic pigment, which includes a carrier, optional back-up and adhesive layers, and undergoes heat and pressure application to transfer a robust reflective feature onto various substrates, ensuring durability and resistance to dye migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solvent-based inks are used for heat transfer labels with reflective polychromatic effects, then the labels can be manufactured with polychromatic effects, but they exhibit poor wash-fastness and cannot withstand standard 60°C wash tests
Solution Approach 1:
The patent changes the chemical composition parameters of the ink from solvent-based to water-based formulation. This parameter change fundamentally alters the ink's properties, enabling it to withstand 60°C wash tests while maintaining robust reflective polychromatic effects, thereby resolving the wash-fastness issue without sacrificing the visual effect
Solution Approach 2:
The patent uses a composite ink formulation containing water-based vehicle, polychromatic effects pigment, and specific additives (surfactants, thickeners, pH adjusters). This composite material approach creates an ink system that combines the benefits of water-based safety with enhanced durability and wash-fastness, overcoming the limitations of simple solvent-based formulations
2Reliability
If known reflective polychromatic effects labels are used, then they can provide color effects, but they exhibit poor resistance to dye migration and require dye blockers
Solution Approach 1:
The patent removes the dye blocker layer from the label structure entirely. By formulating a water-based ink with superior dye migration resistance, the invention extracts the unnecessary intermediate layer, simplifying the label construction while maintaining or improving performance. The ink formulation itself provides the barrier function that previously required a separate dye blocker layer
Solution Approach 2:
The patent changes the chemical parameters of the ink system to achieve inherent dye migration resistance. The water-based formulation with specific pH, surfactant content, and pigment dispersion characteristics creates an ink that resists dye migration without requiring additional protective layers, thereby reducing structural complexity while improving reliability
3Reliability
If solvent-based inks are used for heat transfer labels, then the labels can be manufactured with reflective polychromatic effects, but they are not environmentally friendly
Solution Approach 1:
The patent fundamentally changes the solvent parameter from organic solvents to water as the base vehicle. This parameter change eliminates the environmental harm associated with solvent-based inks while maintaining the ink's functionality for producing reflective polychromatic effects. The water-based formulation is inherently more environmentally friendly, non-flammable, and safer for both manufacturing and end-use applications
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 label maintains robust reflective polychromatic effects and withstands multiple wash cycles and resistance tests, including 60°C washes and crock tests, while being environmentally friendly.
Implementation Method 1
The polychromatic effects feature exhibits robust polychromatic effects on the apparel item
Implementation Method 2
The polychromatic effects heat transfer label is transferred from the carrier to an apparel item
Data Source
AI summary
A polychromatic effects heat transfer label includes a carrier and a polychromatic effects design layer on the carrier. The polychromatic effects design layer is formulated from an ink having a polychromatic effects pigment present in a concentration of about 1 percent to about 25 percent by weight of the ink. The polychromatic effects heat transfer label is transferred from the carrier to an apparel item as a polychromatic effects feature and the polychromatic effects feature exhibits robust polychromatic effects on the item. The polychromatic effects feature exhibits no adhesion failure, no color change, no stain, and no visual change after being subjected to a Nike standard embellishment durability wash tests of an accelerated wash, 5 times at a temperature of 60° C. and an innovation standard wash, 15 times at a temperature of 60° C., and being tumbled dry after each wash and exhibits no color transfer, no abrasion and no visual change after being subjected to an AATCC standard crock test, 10 crocks with an SDLATLAS CM-5 AATCC crockmeter and an TIC crockmeter using 2″×2″ squares. Polychromatic effects heat transfer labels for transfer to plastic, carbon fiber and metal are disclosed.