Flexographic Printing Precursor with Microcells for Dense Ink Coverage
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Solution Overview
Problem
Existing flexographic printing methods face challenges in achieving uniform, dense ink coverage in solid areas without deforming smaller plate elements, and conventional digital workflows result in dot sharpening effects that affect print quality and require costly high-resolution imaging equipment and longer processing times.
Innovation Solution
A photosensitive element with a pre-embossed microcell pattern is used, comprising a photopolymerizable layer and an infrared ablation layer thermally embossed with a microcell pattern, allowing for efficient production of a relief printing form without the need for high-resolution digital imaging equipment, while maintaining high print quality and uniform ink transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional digital workflow with laser imaging is used, then ease of operation is improved, but manufacturing precision deteriorates due to dot sharpening effect
Solution Approach 1:
The patent applies preliminary action by pre-forming the microcell pattern on the photopolymerizable layer before the laser imaging process. This pre-patterned layer serves as a template that guides the subsequent laser exposure, preventing dot sharpening while maintaining the ease of digital workflow operation. The microcell structure is prepared in advance to control the final relief image quality without requiring high-resolution imaging equipment.
2Manufacturing precision
If high-resolution digital imaging equipment is used, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses a simplified copy approach by creating a microcell pattern that replicates the essential printing functionality without requiring complex high-resolution imaging equipment. The pre-formed microcell pattern acts as a template copy that can be reproduced using standard digital imaging devices, thereby maintaining manufacturing precision while reducing device complexity and cost.
3Manufacturing precision
If high-resolution digital imaging is used, then manufacturing precision is improved, but loss of time increases due to longer processing times
Solution Approach 1:
The patent applies preliminary action by pre-forming the microcell pattern before the laser imaging process. This pre-prepared pattern eliminates the need for time-consuming high-resolution scanning and processing during the actual imaging step, thereby reducing overall processing time while maintaining manufacturing precision through the pre-established microcell template.
4Quantity of substance
If pressure is increased to improve ink density, then ink transfer is improved, but smaller plate elements are deformed
Solution Approach 1:
The patent applies local quality by creating a microcell pattern with specific local structures that enhance ink retention without requiring high pressure. The microcell geometry provides localized capillary action and surface area enhancement that improves ink density while the overall plate structure remains intact, preventing deformation of smaller plate elements through distributed rather than concentrated pressure.
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 method provides improved ink transfer and print quality, including solid ink density, fine print elements, and highlight dots, without the need for additional imaging time or costly equipment, thus enhancing productivity and reducing production costs.
Implementation Method 1
an infrared ablation layer that is ablatable by infrared radiation... comprising: (i) at least one infrared absorbing material
Implementation Method 2
Photopolymerizable elements are characterized by their ability to crosslink or cure upon exposure to actinic radiation
Data Source
AI summary
The invention pertains to a photosensitive element, particularly a photopolymerizable printing form precursor; and, a process of making the photosensitive element. The printing form precursor includes a cover sheet, a layer of a photosensitive composition, and a digital layer, or infrared ablation layer, that is adjacent to a side of the photosensitive layer. A microcell patterned is embossed onto the infrared ablation layer or an overcoat/barrier layer on the infrared ablation layer. Since the microcell pattern layer is integral with the printing form precursor, digital imaging can occur rapidly with relatively low resolution optics to form a mask without needing to also form a microcell pattern of the digital layer. The printing form precursor having the integrated microcell pattern layer facilitates the preparation of relief printing forms to have a print surface suitable for printing solids with uniform, dense coverage of ink.