Multilayer Laser Marking Label Resin Composition
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Solution Overview
Problem
Conventional internal color development type laser marking labels face issues with dust generation and heat during marking, leading to blistering and poor removability due to reduced adherence between layers, which affects print readability and removability.
Innovation Solution
A multilayer body configuration with a first transparent layer, a second layer containing an acrylic-based copolymer, an isocyanate-based crosslinking agent, a color development pigment, and a white pigment, and a third adhesive layer, where the isocyanate-based crosslinking agent is selected from aromatic-aliphatic or a mixture of aliphatic and aromatic isocyanate-based agents, optimizing adherence and toughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an intermediate layer is provided between the surface layer and the color development layer to inhibit blistering and improve distinguishability, then print readability is improved, but the production process becomes complicated and production cost increases
Solution Approach 1:
The patent extracts the essential function of the intermediate layer (inhibiting blistering and improving adherence) and integrates it into the color development layer itself through specific resin composition formulation. The color development layer now contains a multi-component resin system with controlled crosslinking that provides both color development and blister resistance functions, eliminating the need for a separate intermediate layer while maintaining print readability.
Solution Approach 2:
The patent merges the functions of the color development layer and the intermediate layer into a single integrated color development layer. By formulating the color development layer with a specific resin composition containing crosslinking agents and controlled dust generation properties, it simultaneously achieves color development, adherence improvement, and blister inhibition, thereby simplifying the overall layer structure and production process.
2Reliability
If the adherence between the surface layer and the color development layer is improved for better removability, then removability is improved, but dust generation during laser marking may increase affecting print quality
Solution Approach 1:
The patent changes the chemical and physical parameters of the color development layer by introducing a multi-component resin system with specific crosslinking agents. This formulation controls the layer's response to laser heating, reducing dust generation through controlled crosslinking while maintaining flexibility and adherence for good removability. The key parameters adjusted include crosslinking density, resin composition ratios, and thermal response characteristics.
Solution Approach 2:
The patent uses a composite resin material in the color development layer that combines multiple components: acrylic-based copolymer, isocyanate-based crosslinking agent, color development pigment, and white pigment. This composite formulation achieves a balance between adherence (for removability) and dust generation control, as the crosslinked network structure reduces dust while the overall composition maintains layer flexibility for clean peeling.
3Object-generated harmful factors
If the color development layer is made more adherent to prevent dust generation, then dust generation is reduced, but the label may not peel off cleanly reducing removability
Solution Approach 1:
The patent carefully controls the crosslinking parameters and resin composition to achieve optimal balance. The isocyanate-based crosslinking agent is used in controlled amounts to create a crosslinked network that reduces dust generation during laser marking, while the overall composition maintains sufficient flexibility and controlled adhesion strength to enable clean peeling. The key is controlling the degree and type of crosslinking rather than maximizing adherence.
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 inhibits dust generation and improves adherence between layers, enhancing print readability and removability, even in harsh environments, while simplifying the production process and reducing costs compared to previous designs.
Implementation Method 1
the second layer consisting of a resin composition containing an acrylic-based copolymer, an isocyanate-based crosslinking agent, a color development pigment, and a white pigment
Implementation Method 2
a color development layer contains a pigment whose color is changed by laser light. Therefore, printing is carried out by the change in color of the pigment by laser light
Implementation Method 3
printing is carried out by the change in color of the pigment by laser light and by carbonization of a resin contained in the color development layer by heat
Data Source
Figure 1
AI summary
Provided is a multilayer body having good print readability and removability. A multilayer body (1) is for a laser marking label and includes a first layer (10) allowing laser light to pass through, a second layer (20) developing a color by laser light, and a third layer (30) having adhesiveness, which are stacked in this order. The second layer (20) consists of a resin composition containing an acrylic-based copolymer, an isocyanate-based crosslinking agent, a color development pigment, and a white pigment. The isocyanate-based crosslinking agent is selected from (i) an aromatic-aliphatic isocyanate-based crosslinking agent or (ii) a mixture of an aliphatic or alicyclic isocyanate-based crosslinking agent and an aromatic isocyanate-based crosslinking agent. A contained amount of the isocyanate-based crosslinking agent is 5-40 parts by mass with respect to 100 parts by mass of the acrylic-based copolymer. The second layer (20) is in contact with the first layer (10).