Laser-Induced Optical Modulation in Plastic Materials
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Solution Overview
Problem
Conventional laser marking techniques for plastics primarily focus on visible modifications and do not allow for optical reactions beyond reflection, limiting their applicability in situations requiring other forms of optical modulation.
Innovation Solution
The method involves transforming plastic materials into an optically modulating state by applying laser radiation, which can alter the light's wavelength, amplitude, direction, or phase, creating fluorescent or scattering effects, and can be used to generate geometric patterns, datamatrix codes, or reference marks on the surface or within the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional laser marking techniques are used on plastic materials, then visible modifications and reflection-based marking are achieved, but optical reactions beyond reflection (such as fluorescence or scattering) cannot be generated
Solution Approach 1:
The patent changes the laser processing parameters including using lower energy density (0.1 nJoule/μm2 to 100 μJoule/μm2), specific wavelength ranges (355 nm to 1064 nm), and controlled pulse durations to transform the plastic material into an optically modulating state that enables fluorescence and scattering effects while maintaining marking durability
Solution Approach 2:
The patent employs plastic materials containing specific additives or with modified chemical composition that enable optical modulation. The material composition is engineered to achieve both the desired optical effects (fluorescence, scattering) and durability requirements through the interaction of the base plastic with laser radiation
2Manufacturing precision
If high energy laser radiation is applied to plastic material, then material ablation and carbonization occur, but the material structure is damaged and water resistance is compromised
Solution Approach 1:
The patent applies partial action by using controlled, low-to-moderate energy density laser radiation (0.1 nJoule/μm2 to 100 μJoule/μm2) that is sufficient to induce optical modulation effects (fluorescence, scattering) without excessive energy that would cause material ablation, carbonization, or structural damage. This partial action achieves the desired optical properties while preserving material integrity and water resistance
3Adaptability or versatility
If laser radiation transforms plastic material into optically modulating state, then fluorescent and scattering effects are achieved, but the processing energy requirements and complexity increase
Solution Approach 1:
The patent optimizes laser processing parameters including energy density (0.1 nJoule/μm2 to 100 μJoule/μm2), wavelength (355 nm to 1064 nm), and pulse duration to achieve optical modulation with controlled energy consumption. By carefully selecting these parameters, the process enables fluorescent and scattering effects while managing energy requirements efficiently
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
This approach enables the creation of durable, water-resistant, and optically modulating plastic materials that can emit light at specific wavelengths, suitable for various industrial applications, including microfluidic devices and optical instruments, by modifying the material's structure and chemical composition.
Implementation Method 1
The optically modulating state can be a fluorescent or a scattering state or similar to a fluorescent state or comparable to a fluorescent state
Implementation Method 2
The optically modulating state can be a fluorescent or a scattering state or similar to a fluorescent state or comparable to a fluorescent state
Implementation Method 3
The underlying effect is generally based on an interaction between the polymeric matrix of the material or a laser sensitive additive to said material with a laser beam, which generates a high degree of thermal energy at the laser target point
Implementation Method 4
The application of energy is assumed to result in pyrolysis, carbonization and/or ablation of material, leading to macroscopic modifications of the material
Data Source
AI summary
A method for the transformation of material (e.g. plastic material) into an optically modulating state via laser radiation is described. The optically modulating state may be a state in which light is emitted at a different wavelength than it is absorbed. The plastic material to may be a thermoplastic or elastomeric material, or an organic polymer selected from the group consisting of polyethylene, polypropylene, polystyrene, polycarbonate and polycycloolefin. The laser radiation may comprise the application of an amount of energy of about 0.1 nJoule/μm2 to about 100 μJoule/μm2 and/or may comprise a radiation of a wavelength of about 355 nm to about 1064 nm. The optically modulating state of the plastic material may absorb light in a wavelength spectrum of about 380 nm to about 540 nm and/or a wavelength spectrum of about 635 nm to about 655 nm. The optically modulating state of the plastic material may emit light in a wavelength spectrum of about 550 nm to about 800 nm. The transformation of the plastic material may comprise the generation of optically modulating elements on the surface of said plastic material, selected from the group comprising geometrical forms, geometrical pattern, spots, dots, lines, circles, squares, characters, symbols, drawings, barcode and datamatrixcode. The material may be used as component for the manufacture of a device, microfluidic device, system, cartridge or instrument. Based on the employment of the material the usability of a device or system and/or of any procedure, function or method carried out with it or in it may be determined and/or controlled.