Lithographic Plate Processing with Cascade Gumming and Flat Brushing
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Solution Overview
Problem
Existing methods for processing lithographic printing plate precursors face challenges in achieving excellent clean-out performance under non-aggressive conditions while reducing the consumption of processing liquids and minimizing waste generation, especially for plates stored for extended periods.
Innovation Solution
The method involves developing lithographic printing plate precursors using two gum solutions in a cascade configuration, combined with mechanical brushing and/or rubbing using flat brushes. This process improves clean-out behavior and reduces the volume of processing liquids required, minimizing waste generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional development methods are used with immersion or spraying, then the plate can be developed, but the consumption of processing liquids is high and clean-out performance is insufficient
Solution Approach 1:
The development process is segmented into two distinct gumming units: a first gumming unit with a first gum solution for primary development, and a second gumming unit with a second gum solution for enhanced clean-out. This segmentation allows each unit to perform a specific function, improving overall clean-out performance while managing liquid consumption through the cascade configuration where the second gum solution overflows into the first.
Solution Approach 2:
The invention employs a cascade hydraulic configuration where the second gum solution overflows from the second gumming unit into the first gumming unit. This hydraulic arrangement enables efficient liquid management, reducing the total consumption of processing liquids while maintaining effective development and clean-out through the controlled flow and mixing of the two gum solutions.
2Manufacturing precision
If mechanical brushing is applied during development, then clean-out performance improves, but the complexity of the processing apparatus increases
Solution Approach 1:
The flat brush is designed to serve multiple functions simultaneously: it applies mechanical action for enhanced clean-out, distributes the gum solution uniformly across the plate surface, and guides the liquid flow. This multi-functionality reduces the need for separate components, thereby limiting the increase in apparatus complexity while achieving superior clean-out performance.
Solution Approach 2:
The invention changes the parameter of brush geometry from conventional round or wire brushes to a flat brush configuration. This parameter change in brush shape optimizes the contact surface area and distribution of mechanical action and liquid flow, achieving improved clean-out performance with a relatively simple structural modification rather than adding complex mechanisms.
3Loss of substance
If a cascade configuration with two gum solutions is used, then liquid consumption is reduced, but the device complexity increases
Solution Approach 1:
The cascade configuration merges the two gumming units into an integrated system where the second gum solution overflows into the first gumming unit. This merging creates a synergistic effect where the two gum solutions work together, reducing total liquid consumption through efficient utilization and recirculation, while the integrated design minimizes the increase in overall device complexity compared to separate independent units.
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
The approach significantly enhances the clean-out performance of non-image areas, reduces the consumption of gum solution and rinse water, and allows for the use of the apparatus in locations without a water supply, making it environmentally friendly and cost-effective.
Implementation Method 1
image-wise exposing a coating including a photopolymerizable composition followed by treating the precursor in a gumming station
Implementation Method 2
treating the precursor in a gumming station by applying a gum solution to the coating of the precursor, thereby removing the non-exposed areas of the photopolymerizable layer from the support
Data Source
AI summary
A method and apparatus for processing a lithographic printing plate precursor, comprising development with a first gum solution and subsequently with a second gum solution, wherein both gum solutions are provided in a cascade configuration whereby the second gum solution overflows into the first gum solution and the development is combined with mechanical rubbing and/or brushing by one or more flat brushes.