UV-Curable Heat Transfer Label Preventing Ink Cracking
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Solution Overview
Problem
Heat transfer labels using solvent-based inks face issues such as health and environmental concerns, high production costs, and aesthetic problems like cracking due to the rigidity of UV-curable inks, which limit their flexibility and durability.
Innovation Solution
The development of heat transfer labels with at least one UV-curable layer, including a protective lacquer, ink, and adhesive, formulated to prevent cracking and reduce solvent-based material usage, along with the incorporation of a UV-curable tie-coat layer for enhanced elasticity, allowing for flexible application without cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If UV-curable inks are used in heat transfer labels, then production costs are reduced and environmental safety is improved, but the inks cause cracking due to rigidity
Solution Approach 1:
The patent applies composite materials by combining UV-curable ink layers with solvent-based protective lacquer and adhesive layers. This multi-layer composite structure allows the UV-curable ink to provide cost benefits while the solvent-based layers provide flexibility and prevent cracking, resolving the contradiction between cost reduction and cracking resistance
Solution Approach 2:
The patent changes the physical and chemical parameters of the label structure by controlling the thickness, composition, and curing degree of each layer. By adjusting these parameters, the UV-curable ink maintains rigidity for cost efficiency while the overall label structure achieves flexibility to prevent cracking
2Reliability
If solvent-based inks are used in heat transfer labels, then flexibility and durability are improved, but health and environmental concerns arise
Solution Approach 1:
The patent extracts the harmful solvent-based ink component and replaces it with UV-curable ink, while retaining the necessary solvent-based protective and adhesive layers. This extraction eliminates the harmful factors associated with solvent-based inks while maintaining the required flexibility and durability through the protective lacquer and adhesive layers
Solution Approach 2:
The patent applies different material qualities to different layers: UV-curable ink for the design layer (cost-effective, environmentally safe), solvent-based protective lacquer for protection (flexible, durable), and solvent-based adhesive for bonding (flexible, durable). Each layer has optimized local quality to address specific requirements without compromising overall performance
3Productivity
If UV-curable inks are used in heat transfer labels, then production efficiency is improved, but aesthetic quality deteriorates due to cracking
Solution Approach 1:
The patent uses composite materials where UV-curable ink layers provide production efficiency benefits, while solvent-based protective lacquer layers provide aesthetic quality by preventing cracking. The combination ensures both high productivity and manufacturing precision
Solution Approach 2:
The patent applies solvent-based protective lacquer layers beforehand to cushion and protect the UV-curable ink layers from cracking during the heat transfer process. This prior cushioning prevents aesthetic quality deterioration while maintaining production efficiency
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 solution enables heat transfer labels to stretch and adhere effectively to various surfaces without cracking, reducing solvent use and production costs, while ensuring aesthetic quality and environmental safety.
Implementation Method 1
at least one of the protective lacquer layer, the ink layer, and the adhesive layer is UV-curable
Implementation Method 2
When subjected to heat, the wax release layer softens or melts, thereby allowing the transfer portion to be separated from the carrier sheet
Data Source
AI summary
A heat transfer label and method for preparing same, the heat transfer label including (a) a support portion and (b) a transfer portion over the support portion, for transfer of the transfer portion from the support portion to an article upon application of heat to the support portion while the transfer portion is placed into contact with the article. The transfer portion includes at least a protective lacquer layer, an ink layer, and an adhesive layer, wherein at least one of the protective lacquer layer, the ink layer, and the adhesive layer is UV-curable. Further, the heat transfer label may additionally include a tie-coat layer, which may be a UV-curable tie-coat layer. Further, each of the plurality of layers of the transfer portion of the heat transfer label may be UV-curable.