Hybrid Printing Dots in Flexographic Plates
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Solution Overview
Problem
Flexographic printing technologies face challenges in producing relief image printing elements with both round top and flat top dots on the same printing element, as existing methods often require additional processing steps or specialized equipment, leading to issues with ink transfer and dot durability, especially in high-resolution and highlight areas.
Innovation Solution
A method involving a photocurable composition with specific additives such as butylated hydroxytoluene, pentaerythritol tetrakis, and other phenolic antioxidants, which allows for the creation of both round top and flat top dots on the same printing element through selective imaging and development, enabling hybrid printing dots with controlled shape and depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional flexographic printing methods are used, then printing durability and ease of manufacture are improved, but the ability to produce both round top and flat top dots on the same printing element deteriorates
Solution Approach 1:
The patent applies local quality by creating different dot topologies (round top vs. flat top) in different regions of the same printing plate based on local requirements. Small dots receive round top morphology for durability, while larger dots receive flat top morphology for ink transfer, allowing each region to have the optimal dot structure for its specific function.
Solution Approach 2:
The patent employs dynamics by making the dot morphology adaptive and variable rather than fixed. The imaging system dynamically adjusts the dot topography during the imaging process based on dot size and position, enabling the plate to exhibit different surface characteristics in different areas to optimize both durability and ink transfer performance.
2Adaptability or versatility
If additional processing steps or specialized equipment are used to create hybrid dots, then the ability to produce both round top and flat top dots is improved, but device complexity and processing time increase
Solution Approach 1:
The patent applies universality by designing a single imaging system that performs multiple functions: it images the printing plate and simultaneously controls dot morphology formation. The photopolymer composition and imaging parameters are configured to automatically produce both round top and flat top dots through one unified process, eliminating the need for separate processing steps or specialized equipment.
Solution Approach 2:
The patent merges the dot formation process with the standard photopolymer imaging process. Instead of adding a separate step to create hybrid dots, the morphology control is integrated into the imaging exposure itself, combining what would traditionally be separate operations into a single unified process.
3Manufacturing precision
If conventional imaging methods are used, then manufacturing simplicity is maintained, but ink transfer consistency and dot durability in high-resolution areas deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying the photopolymer composition parameters (adding specific additives) and imaging parameters (exposure energy distribution) to control the physical morphology of the dots. By adjusting these parameters, the system achieves both high manufacturing precision for small dots and reliable ink transfer for larger dots simultaneously.
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 enables the production of hybrid printing dots with sharp edges and consistent ink transfer, supporting both high-resolution and high-ink transfer requirements without additional processing steps or specialized equipment, enhancing the flexibility and quality of flexographic printing.
Implementation Method 1
selectively imaging the one or more photocurable layers to actinic radiation to selectively crosslink and cure portions of the one or more photocurable layers
Implementation Method 2
the one or more photocurable layers comprise a photocurable composition comprising: a binder; one or more monomers; a photoinitiator; and about 0.01 to about 2.0 percent by weight of a material selected from the group consisting of butylated hydroxytoluene; pentaerythritol tetrakis (3-(3,5-ditertbutyl-4-hydroxy phenyl) propionate); octadecyl 3,5 Di-tert-butyl-4-hydroxyhydrocinnamate
Data Source
AI summary
A method of producing a relief image printing element from a photocurable printing blank. The method includes the steps of a) providing a photocurable printing blank, the photocurable printing blank comprising (i) a backing or support layer; and (ii) one or more photocurable layers disposed on the backing or support layer. The one or more photocurable layers are selectively imaged by exposing the layers to actinic radiation to selectively crosslink and cure portions of the one or more photocurable layers, and then developed to remove uncured portions of the one or more photocurable layers and reveal the relief image therein. The relief image comprises a plurality of relief printing dots, including relief printing dots that have a rounded top and relief printing dots that have a flat top.