Laser-Imageable Marking Compositions for Secondary Packaging
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Solution Overview
Problem
Conventional label technologies are inadequate for non-contact, high-reproducibility, and environmental resistance in secondary packaging labeling applications, particularly with near-IR diode lasers, as they fail to provide distinct colored images and are sensitive to UV, moisture, and abrasion.
Innovation Solution
A tape construct comprising a polymeric substrate, a NIR-absorbing ink layer, and an adhesive layer, which can be imaged using lasers, offering enhanced adhesion, environmental stability, and image visibility through the substrate or adhesive without distortion, utilizing materials like ammonium octamolybdate and titanium dioxide for improved contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional label technologies are used, then the labeling process can be performed, but the image creation lacks high reproducibility and environmental resistance
Solution Approach 1:
The patent replaces conventional contact-based printing methods with non-contact laser imaging. The laser beam directly creates images on the tape construct without mechanical contact, eliminating the need for physical printing presses and improving reproducibility while reducing mechanical complexity in the labeling system.
Solution Approach 2:
The patent utilizes the specific optical parameters of near-IR diode lasers (wavelength, intensity, pulse duration) to selectively activate NIR-absorbing components in the ink layer. By controlling laser parameters such as fluence and scanning speed, the system achieves high-reproducibility image creation with precise environmental resistance characteristics.
2Illumination intensity
If materials absorbing far-IR to mid-IR radiation are used, then distinct colored images can be generated on exposure to those wavelengths, but the images are not visible on near-IR sources
Solution Approach 1:
The patent incorporates specific NIR-absorbing components (such as ammonium octamolybdate) in the ink layer that have selective absorption characteristics for near-IR wavelengths. This local optimization of material properties ensures the ink responds specifically to near-IR laser radiation while remaining invisible or low-visibility under other lighting conditions, achieving both visibility and wavelength adaptability.
Solution Approach 2:
The ink composition uses composite material systems combining NIR-absorbing pigments or dyes with appropriate binders. This composite approach enables the material to absorb near-IR radiation effectively while maintaining the desired visual properties when activated, solving the contradiction between wavelength-specific absorption and broad adaptability.
3Illumination intensity
If a transparent substrate is used, then the image can be viewed through the substrate, but the substrate offers less protection against environmental factors
Solution Approach 1:
The patent positions the NIR-absorbing ink layer between the transparent substrate and the adhesive layer, creating a multi-layer protective structure. This dimensional arrangement allows the ink to serve dual functions: maintaining optical transparency for image visibility while being protected by the substrate from environmental factors such as UV radiation, moisture, and chemicals.
Solution Approach 2:
The transparent substrate acts as a pre-established protective barrier that shields the NIR-absorbing ink layer from environmental degradation before exposure occurs. This beforehand protection ensures the ink maintains its optical and chemical properties while still allowing laser penetration and image creation.
4Illumination intensity
If high energy lasers are used for laser imaging, then distinct images can be generated, but the system lacks portability and economy
Solution Approach 1:
The patent modifies the optical parameters of the imaging system by using near-IR diode lasers with wavelengths specifically absorbed by the NIR-absorbing components in the ink. This parameter change allows the use of lower energy, more economical diode lasers instead of high energy lasers, improving portability and reducing system cost while maintaining effective image generation capability.
Solution Approach 2:
The patent uses near-IR diode lasers that are commercially available and economically viable, effectively copying the successful application of laser imaging from other domains but adapting it to use lower-cost, more portable light sources that still achieve the required image generation through selective material absorption.
Data Source
AI summary
A tape construct comprises a laser-imageable composition, whereby images can be created in said tape by irradiation with a laser. In an alternative, a laser-imageable formulation suitable for spray application to a substrate, comprises a colour-former, a binder and a carrier.