Marking Composition for Flexible Packaging
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Solution Overview
Problem
Current methods for marking flexible packaging materials, such as food products, are limited in their ability to create durable and long-lasting marks without damaging the underlying layers or affecting the packaging's gas transmission properties.
Innovation Solution
A method involving a marking composition with a dye, color developer, and absorber, capable of interacting with electromagnetic radiation to change color permanently, applied between layers of flexible packaging, allowing for mark formation without physical contact and maintaining the packaging's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional marking methods are used on flexible packaging, then marking can be achieved, but the packaging layers may be damaged or gas transmission properties may be affected
Solution Approach 1:
The marking composition is segmented into multiple functional components: a dye component for coloration, a color developer for permanent color change, and an absorber component for electromagnetic radiation absorption. These components work together but can be optimized independently to achieve durable marking without damaging the packaging layers.
Solution Approach 2:
The marking composition acts as an intermediary between the electromagnetic radiation (laser) and the packaging material. It absorbs the radiation energy and converts it to a permanent color change, preventing direct interaction between the laser and the packaging layers that would cause damage.
2Productivity
If high laser energy is used for marking, then marking speed and efficiency improve, but the packaging material may be damaged
Solution Approach 1:
The absorber component is specifically selected to match the wavelength of the electromagnetic radiation source, optimizing energy absorption efficiency. This allows the use of lower laser energy densities (0.1-7 J/cm²) while maintaining fast marking speeds, thereby preventing packaging layer damage.
3Reliability
If marking composition is applied between packaging layers, then mark durability and resistance to abrasion improve, but the complexity of the packaging structure increases
Solution Approach 1:
The marking composition is merged with the packaging structure by applying it between the substrate and the first layer. This integration provides several benefits: the mark is protected from abrasion and environmental factors, the packaging structure itself becomes part of the marking system, and no additional separate marking layer is required.
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 reliable, cost-effective, and durable marking of flexible packaging without compromising the packaging's gas transmission rates or layer integrity, with the ability to form marks quickly and efficiently using low laser energy.
Implementation Method 1
the marking composition includes an absorber capable of producing thermal energy upon interacting with the electromagnetic radiation
Implementation Method 2
the absorber is capable of producing thermal energy upon interacting with the electromagnetic radiation
Implementation Method 3
The marking composition includes a dye and a color developer... the marking composition is capable of interacting with the electromagnetic radiation to form a mark... the mark exhibits a second color different from the first color. The change from the first color to the second color can be a permanent change.
Data Source
AI summary
Methods are disclosed that include directing electromagnetic radiation and/or heat to a structure, the structure including a substrate, a first layer, and a marking composition between the substrate and the first layer. At least a portion of the electromagnetic radiation and/or heat is transmitted through the first layer and the structure is marked.