Continuous Liquid Interphase Flexographic Plate Production
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Solution Overview
Problem
Current methods for producing flexographic printing plates are time-consuming, generate significant waste, and struggle to create printing dots with desirable characteristics such as edge definition and shoulder angle, leading to issues in printing small graphic elements like fine dots and lines.
Innovation Solution
A continuous liquid interphase 3D production method using a photocurable composition comprising polyurethane acrylate resin, methacrylate resin, and styrenic block copolymers, with actinic radiation crosslinking and curing the composition on a carrier plate, allowing for continuous formation of flexographic printing plates with improved dot characteristics and reduced waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photopolymerization methods are used with flood exposure through negatives, then the process is simple to implement, but production time is excessive and waste is significant
Solution Approach 1:
The patent extracts and removes the negative material from the process entirely, replacing it with direct digital light projection. This eliminates the need for physical negatives, their handling, and the associated waste, while dramatically reducing exposure time from minutes to seconds.
Solution Approach 2:
The patent replaces the mechanical flood exposure system with negatives and chemical development processes with a digital light projection system that directly patterns the photopolymer. This substitution eliminates mechanical handling of negatives and chemical waste streams.
2Manufacturing precision
If traditional photopolymerization is used, then the process is well-established, but it struggles to create printing dots with desirable edge definition and shoulder angle
Solution Approach 1:
The patent applies local quality by using digital light projection to create spatially varying exposure patterns with precise control over intensity distribution. This enables different regions of the photopolymer to receive tailored exposure doses, creating printing dots with optimized edge definition and shoulder angles through localized property control.
Solution Approach 2:
The patent introduces dynamics by using programmable, time-varying light patterns to control the polymerization process. The exposure parameters can be dynamically adjusted during the process to optimize dot characteristics, allowing real-time control over edge definition and shoulder angle formation.
3Adaptability or versatility
If conventional plate making processes are used, then they can handle various substrates, but they generate significant waste and are time-consuming
Solution Approach 1:
The patent applies parameter changes by using digital light projection to precisely control exposure dose, duration, and spatial distribution. This enables optimization of the polymerization process for different substrate types without requiring physical changes to the process setup, maintaining versatility while eliminating waste through direct digital patterning.
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 enhanced dot characteristics, enabling more efficient and reliable printing on various substrates.
Implementation Method 1
actinic radiation is capable of shining through the transparent bottom; providing actinic radiation beneath the transparent bottom of the reservoir, wherein the radiation crosslinks and cures areas of the 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.