Laser Marking Multilayered Articles via Release Agents
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Solution Overview
Problem
Existing laser-marking processes often damage functional layers in multilayered materials, particularly those with release agents, leading to poor adhesion and increased manufacturing steps, and traditional printing methods are unsatisfactory for such materials.
Innovation Solution
A process involving a release liner with a laser-markable layer containing organic polymer and light-sensitive pigment, where laser radiation is directed through transparent release agents to create markings without damaging the release properties, using materials like silicones and fluorocarbons for the release agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser radiation is directed through transparent layers to mark an underlying layer, then marking capability is achieved, but the transparent layers may be damaged or modified
Solution Approach 1:
The patent introduces a specially formulated transparent layer containing laser-absorbing particles as an intermediary between the laser source and the functional layers. This intermediary layer selectively absorbs the laser energy to create the mark while being designed to minimize damage to itself and other transparent layers through controlled particle distribution and composition
Solution Approach 2:
The patent applies different properties to different parts of the transparent layer system. The marking zone contains high concentrations of laser-absorbing particles to enable marking, while other zones maintain lower concentrations to preserve transparency and minimize damage. This local differentiation allows simultaneous achievement of marking capability and layer protection
2Manufacturing precision
If traditional printing methods are used on release agent layers, then printing capability is achieved, but adhesion and wetting properties deteriorate
Solution Approach 1:
The patent replaces traditional mechanical printing methods with laser-based marking. The laser marking process uses photothermal or photochemical effects to create permanent marks on the release agent layer without requiring physical contact, thereby preserving the layer's adhesion and wetting properties while achieving marking capability
Solution Approach 2:
The patent changes the physical parameters of the marking process by using laser radiation with specific wavelengths that can be absorbed by the release agent layer without causing degradation. By controlling laser parameters such as power, pulse duration, and scanning speed, the process achieves marking while maintaining the functional properties of the release agent
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
Enables laser-marking of multilayered articles without compromising the performance of functional materials, maintaining acceptable release properties and adhesion, and simplifying the manufacturing process by avoiding direct exposure of critical layers to laser radiation.
Implementation Method 1
a first layer of a first release agent disposed on the first major surface of the laser markable layer, the first release agent being transparent to the laser radiation
Implementation Method 2
Laser-marking the laser-markable layer by directing laser radiation into the multilayered article through the first release agent to induce an interaction between the light-sensitive pigment and the organic polymer to form a visually perceptible marking in the article
Data Source
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AI summary
A process to mark a multilayered article with a laser (20). The multilayered article (10) includes a laser-markable layer (14) having at least one organic polymer and at least one light-sensitive pigment therein, and including at least one release agent associated with the laser-markable layer. Laser-marking of the laser-markable layer is accomplished by directing laser radiation (22) into the multilayered article through the release agent (12) to induce an interaction between the light-sensitive pigment and the organic polymer. As a result of the interaction, a visually perceptible marking (16) is formed in the article. The laser-marked article includes a laser-markable layer and a first release agent associated with a surface of the laser-markable layer. The marking (s) in the laser-markable layer is visible through the layer of release agent, and the marking is a result of the laser-induced interaction between the light-sensitive pigment and the organic polymer.