Flexographic Printing Plate Production With Continuous Liquid Interphase
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing flexographic printing plates are time-consuming, generate significant waste, and struggle to create small, durable printing dots with optimal shape and edge definition for high-quality printing.
Innovation Solution
A continuous liquid interphase 3D production method is employed, using a reservoir of photocurable composition and a carrier plate, where actinic radiation forms the printing plate continuously, reducing the need for layering and allowing for precise control over dot shape and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional layer-by-layer photopolymerization methods are used to produce flexographic printing plates, then the process is simpler to implement, but production time is excessive and significant waste is generated
Solution Approach 1:
The patent implements continuous photopolymerization by moving the substrate through a liquid photopolymer bath while simultaneously irradiating with actinic radiation. This continuous process eliminates the layer-by-layer deposition time and allows uninterrupted production of printing plates, significantly increasing productivity and reducing production time.
Solution Approach 2:
The substrate is pre-coated with a release agent before entering the photopolymerization zone. This preliminary action prevents adhesion of the photopolymer to the substrate during continuous processing, enabling smooth continuous operation without frequent cleaning interruptions, thus improving production efficiency.
2Ease of manufacture
If conventional photopolymerization methods are used, then the process is easier to implement, but waste material is significantly generated
Solution Approach 1:
The patent recycles the liquid photopolymer from the continuous bath by filtering out cured particles and unreacted monomers, then returning the recovered photopolymer to the bath. This recovery process minimizes waste material while maintaining continuous operation, addressing both environmental concerns and material costs.
3Manufacturing precision
If conventional photopolymerization methods are used, then the process is more straightforward, but small printing dots with optimal shape and edge definition cannot be achieved
Solution Approach 1:
The patent replaces mechanical layer-by-layer deposition with a combination of fluid dynamics and optical fields. The liquid photopolymer is delivered through a showerhead or spray system, and actinic radiation selectively cures the material in the desired dot patterns. This substitution enables precise control of dot shape and edge definition through optical masking and fluid control rather than mechanical positioning.
Solution Approach 2:
The patent applies actinic radiation selectively to specific regions of the substrate to create localized photopolymerization. By controlling the intensity, wavelength, and spatial distribution of the radiation, precise dot patterns with well-defined edges are achieved. The liquid photopolymer is also delivered locally through targeted spray or showerhead positioning, ensuring material is deposited only where needed.
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 method significantly reduces production time, minimizes waste, and produces flexographic printing plates with well-defined printing dots, ensuring high-quality printing performance on various substrates.
Implementation Method 1
selectively providing actinic radiation beneath the transparent bottom of the reservoir in a pattern that corresponds to raised relief structures to be formed on the cured layer of photopolymer, wherein the radiation continuously crosslinks and cures areas of the liquid photocurable composition
Data Source
AI summary
A method of producing a flexographic printing plate using a continuous liquid interphase is provided herein. This method allows for significantly reduced production times and fewer preparation steps compared to standard non-continuous techniques and results in less waste than typical methods for preparing flexographic printing plates. The printing plate provided by using continuous liquid interphase production results in a printing plate with desirable elastomeric elongation, desirable hardness, plate thickness in the range of 0.030 inches to 0.250 inches, and comprises printing dots with desirable characteristics.