Flexographic Printing Plate Precursor for Reduced Mask-Layer Pinholes
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Solution Overview
Problem
Existing flexographic printing technologies face issues with the formation of pinholes in the heat-sensitive mask layer, which complicates the process and affects printing quality, particularly during the transition from gravure and offset printing.
Innovation Solution
A flexographic printing plate precursor is designed with specific surface energy and roughness ranges for the cover film, along with a protection layer formed from a polymer compound dispersible in a developing solution, to minimize pinhole formation and maintain printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a release film is attached to protect the mask layer, then pinhole formation is suppressed, but the process becomes complicated
Solution Approach 1:
The invention applies a protection layer to the mask layer surface before any processing steps. This preliminary protective measure prevents pinhole formation during subsequent handling and processing, eliminating the need for separate release film attachment and detachment steps, thus simplifying the overall process while maintaining pinhole suppression
Solution Approach 2:
The invention extracts the protection function from a separate release film component and integrates it directly into the mask layer through a protection layer. This integration eliminates the need for additional components and steps, reducing process complexity while maintaining the pinhole prevention benefit
2Reliability
If the cover film surface is made smoother, then pinhole formation is reduced, but manufacturing difficulty increases
Solution Approach 1:
The invention specifies precise surface energy (25.0 to 40.0 mN/m) and surface roughness (0.01 to 0.2 μm) parameters for the cover film. By defining these parameter ranges, the invention achieves optimal pinhole reduction while maintaining manufacturability within standard industrial capabilities, balancing performance and ease of manufacture
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 solution effectively reduces the size and number of pinholes, ensuring high-quality printing without the complications associated with pinholes, thus enhancing the adaptability and environmental friendliness of flexographic printing.
Implementation Method 1
a protection layer formed from a polymer compound dispersible in a developing solution is provided between the photosensitive resin layer and the heat-sensitive mask layer
Implementation Method 2
the surface energy and the surface roughness (Ra) of a surface of the cover film which contacts with the heat-sensitive mask layer are 25.0 to 40.0 mN/m and 0.01 to 0.2 μm, respectively
Data Source
AI summary
A flexographic printing plate precursor is disclosed in which the size and the number of pinholes in a heat-sensitive mask layer are reduced in a simple manner, and to provide a flexographic printing plate almost free from disadvantages caused by the pinholes, based on the flexographic printing plate precursor. A flexographic printing plate precursor comprising at least a support (A), a photosensitive resin layer (B), a heat-sensitive mask layer (C) and a cover film (D) which are laminated in this order, characterized in that the surface energy and the surface roughness (Ra) of a surface of the cover film (D) which contacts with the heat-sensitive mask layer (C) are 25.0 to 40.0 mN/m and 0.01 to 0.2 μm, respectively, and that a protection layer (E) formed from a polymer compound dispersible in a developing solution is provided between the photosensitive resin layer (B) and the heat-sensitive mask layer (C).