Label with Differential Curing Shrinkage for Crack Prevention
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Solution Overview
Problem
Labels with thick engraving or base layers often suffer from insufficient curing due to inadequate UV or electron beam penetration, leading to peeling or cracking issues.
Innovation Solution
A label structure comprising a first colored layer with a higher curing shrinkage ratio than the indicating layer, where the first colored layer holds the indicating layer, enhancing adhesion and preventing peeling or cracking, regardless of layer thickness, through a specific layer arrangement and crosslinking agent reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engraving layer or base layer is made thick to ensure sufficient material coverage, then the label provides better durability and protection, but the UV ray or electron beam cannot reach the deep portion of the layer, resulting in insufficient curing
Solution Approach 1:
The label is divided into multiple colored layers (first colored layer, second colored layer, indicating layer) with different curing shrinkage ratios. Each layer is cured separately through selective laser heating, allowing adequate penetration depth for complete curing regardless of individual layer thickness. This segmentation enables thick layers to be cured effectively by treating them as separate curable units rather than a single thick mass.
Solution Approach 2:
Different regions of the label have different properties - the first colored layer has a larger curing shrinkage ratio than the indicating layer. This local differentiation in curing characteristics allows each layer to be optimized for its specific function while maintaining overall label integrity. The varying shrinkage ratios create differential curing behavior that prevents peeling and cracking in thick regions.
2Reliability
If the layer thickness is increased to improve durability, then the label provides better protection, but peeling occurs between layers due to insufficient curing
Solution Approach 1:
The patent utilizes different curing shrinkage ratios as a key parameter differentiation between layers. The first colored layer is formulated with a larger curing shrinkage ratio compared to the indicating layer. This parameter change creates differential contraction during curing that generates interlaminar stress to prevent peeling, while allowing each layer to maintain its thickness for durability.
Solution Approach 2:
The label employs a composite structure of multiple colored layers with different material properties. The first colored layer and indicating layer are composite materials with specifically engineered curing shrinkage ratios. This composite approach allows the layers to work together synergistically - the thicker first colored layer provides durability while the different shrinkage characteristic prevents delamination, solving both durability and adhesion requirements simultaneously.
3Reliability
If the first colored layer is made thicker to ensure complete coverage, then the label provides better protection, but cracking occurs due to curing stress
Solution Approach 1:
The patent applies parameter changes in curing shrinkage ratio to prevent cracking in thick layers. By formulating the first colored layer with a larger curing shrinkage ratio than the indicating layer, the differential contraction during curing creates compressive stress that counteracts tensile stress and prevents crack formation. This allows the first colored layer to be made thick for complete coverage while maintaining crack resistance.
Solution Approach 2:
The differential curing shrinkage between layers acts as a preemptive cushioning mechanism. The first colored layer's larger shrinkage ratio is designed in advance to compensate for the tensile stresses that would otherwise develop in thick regions during curing. This beforehand cushioning effect prevents cracking before it can occur, allowing thick layers to be used without compromising strength.
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 achieves excellent durability and prevents peeling or cracking, ensuring strong adhesion between layers and effective laser-based information printing.
Implementation Method 1
The curing shrinkage ratio of the first colored layer is larger than that of the indicating layer embedded in the first colored layer, and therefore the first colored layer holds the indicating layer due to curing.
Implementation Method 2
information is printed by removing the indicating layer and the first colored layer at desired locations with a laser and exposing the second colored layer
Data Source
AI summary
A label 1 includes a first colored layer 10, a second colored layer 20 having a different color from the first colored layer 10, and an indicating layer 30 having a different color from the first colored layer 10 and the second colored layer 20. The indicating layer 30 is fitted into the first colored layer 10 so as to have an exposed surface on one surface of the first colored layer 10. The second colored layer 20 is laminated on the other surface F2 of the first colored layer 10. The curing shrinkage ratio of the first colored layer 10 is larger than that of the indicating layer 30.