LED UV Curing for Photopolymer Printing Plates
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Solution Overview
Problem
Current printing technologies using arc lamps for curing photopolymer printing plates are inefficient, producing excessive heat, requiring high voltage, and resulting in non-uniform curing, which can lead to brittle screen dots and increased UV energy needs.
Innovation Solution
The use of light emitting diodes (LEDs) for curing photopolymer printing plates, which provides a more efficient and controlled UV exposure, reducing heat generation and improving curing uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If arc lamps are used for UV curing of polymer plates, then sufficient UV power is provided, but excessive heat is generated and conversion efficiency is low
Solution Approach 1:
The patent replaces the arc lamp system with a solid-state UV light source that uses a different physical mechanism (electroluminescence from LED or laser excitation of phosphor) to generate UV radiation. This substitution eliminates the arc discharge process that causes excessive heat generation, while still providing sufficient UV power for polymer curing through controlled emission at specific wavelengths.
Solution Approach 2:
The patent changes the operational parameters of the UV source by using solid-state technology instead of gas-filled arc lamps. This parameter change enables the system to achieve high UV output power while maintaining low heat generation, as solid-state sources can be precisely controlled to emit at specific wavelengths without the broad spectrum and high heat output characteristic of arc lamps.
2Power
If arc lamps are used for UV curing, then UV energy is provided, but high voltage and complex cooling systems are required
Solution Approach 1:
The patent replaces the complex water-cooled arc lamp system with a solid-state UV source that generates minimal heat. This substitution eliminates the need for elaborate cooling systems and high-voltage infrastructure, as solid-state LEDs or laser-based sources operate at low voltages and produce insufficient heat to require active cooling during normal operation.
3Productivity
If high UV power is applied to cure plates quickly, then productivity increases, but non-uniform curing occurs and screen dots become brittle
Solution Approach 1:
The patent employs solid-state UV sources that can be precisely positioned and controlled to provide uniform UV irradiation across the polymer plate surface. The directed nature of solid-state emission allows for localized control of UV intensity, ensuring even curing distribution and preventing the formation of brittle screen dots that result from uneven or excessive UV exposure in traditional arc lamp systems.
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
LED-based curing systems offer improved conversion efficiency, reduced energy consumption, and longer operational lifespan compared to arc lamps, resulting in better curing quality and increased productivity.
Implementation Method 1
The use of light emitting diodes (LEDs) for curing photopolymer printing plates
Implementation Method 2
curing photopolymer printing plates
Implementation Method 3
light emitting diodes (LEDs) for curing photopolymer printing plates, which provides a more efficient and controlled UV exposure
Data Source
AI summary
A system for preparing a photopolymer printing plate includes exposure unit with a plurality of UV sources, a holder comprising a UV translucent material configured to receive the printing plate, and a controller configured to activate the plurality of UV sources. The UV sources include at least one back array of stationary back UV sources configured to emit UV radiation toward the non-printing back side of the printing plate through the holder and at least one front array of front UV sources configured to emit UV radiation toward the printing front side of the printing plate with the printing plate disposed in a stationary position on the holder. The back array defines a collective irradiation field covering an area at least coextensive with the lateral length and width of the plate. At least one of the front array, back array, or both, include light emitting diodes (UV LEDs).