Relief Precursor Exposure Sequence Optimization
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Solution Overview
Problem
Existing methods for exposing relief precursors, such as printing plate precursors, are inefficient in terms of productivity while maintaining quality, as they often require sequential exposure steps that do not optimize the overlap of light sources, leading to longer processing times.
Innovation Solution
A method and apparatus that utilize a first light source for back exposure and a movable second light source for front exposure, with a control system to determine a sequence where the second exposure periods either fully overlap or do not overlap with the first exposure period, allowing for simultaneous exposure where possible, to reduce total exposure time without compromising quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential exposure steps are used without optimizing overlap, then exposure quality is maintained, but productivity decreases and processing time increases
Solution Approach 1:
The patent implements continuous useful action by overlapping the exposure periods of the first and second light sources. The control system coordinates the light sources such that the second exposure period overlaps with the first exposure period, allowing both light sources to expose the relief precursor simultaneously during the overlapping interval. This eliminates idle time between exposure steps and maintains continuous productive action throughout the exposure process.
Solution Approach 2:
The control system performs preliminary action by pre-coordinating the exposure sequences of both light sources before actual exposure begins. The system determines the optimal overlap configuration in advance, ensuring that when exposure starts, the light sources are already positioned and timed to maximize overlapping exposure time, thereby reducing total processing time without compromising quality.
2Productivity
If simultaneous exposure with both light sources is implemented, then productivity increases, but thermal uniformity may be compromised
Solution Approach 1:
The patent applies local quality by allowing different regions of the relief precursor to receive different exposure conditions. During the overlapping exposure period, the control system manages the spatial and temporal distribution of light from both sources, ensuring that local thermal conditions remain uniform in critical areas while maintaining high overall productivity. This localized control of exposure quality prevents thermal distortion despite simultaneous exposure.
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 increases productivity by optimizing the exposure sequence, ensuring uniform thermal conditions and reducing the overall duration of the exposure process while maintaining the quality of the printing plate.
Implementation Method 1
the plate is exposed through the mask with radiation such that the photosensitive layer undergoes polymerization or crosslinking
Implementation Method 2
a movable second light source configured to expose a second side of the relief precursor opposite the first side during one or more second exposure periods
Data Source
AI summary
Method for exposing a relief precursor, using a first light source to expose a first side of a relief precursor, a movable second light source to expose a second side of the relief precursor opposite the first side during one or more second exposure periods of one or more second exposure steps, said method comprising the steps of receiving through an operator interface at least one first characteristic representative for the first exposure period and/or at least one second characteristic representative for the one or more second exposure periods determining a sequence of operation for the first light source and the second light source based on the at least one first and/or second characteristic, said sequence being such that each of said one or more second exposure periods either fully overlaps with the first exposure period or does not overlap with the first exposure period.