High-Resolution Flexographic Printing Plate Interlayer Composite
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional flexographic printing plates face challenges in achieving high-resolution reproduction of fine printing elements and tonal values, particularly in the range of 0-5% and 95-100%, due to limitations in the intermediate layer thickness, oxygen attack during exposure, and stability issues with existing recordable layers.
Innovation Solution
A recording element with an interlayer composite consisting of two polymer-containing layers, where a barrier layer prevents diffusion and oxygen penetration, and an adhesion-modulating layer facilitates easy removal of the recordable template layer, enhancing resolution and stability without requiring additional protective atmospheres.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thin intermediate layer is used to improve resolution, then halftone dot resolution is improved, but the layer becomes unstable and ages quickly
Solution Approach 1:
The intermediate layer is divided into two separate layers: a first intermediate layer in direct contact with the recordable template layer and a second intermediate layer in direct contact with the relief layer. This segmentation allows each layer to have optimized thickness and composition, with the first layer being thin enough to prevent diffusion while maintaining stability, and the second layer providing mechanical support and adhesion control.
Solution Approach 2:
The patent uses composite material structures where the first intermediate layer has different chemical composition and properties than the second intermediate layer. The first layer is formulated to be resistant to diffusion of diazo compounds and monomers, while the second layer is formulated for proper adhesion to the relief layer and mechanical stability, creating a composite structure that solves both resolution and stability requirements.
2Manufacturing precision
If a thin intermediate layer is used to improve resolution, then halftone dot resolution is improved, but oxygen attack during exposure is intensified
Solution Approach 1:
The first intermediate layer acts as an intermediary barrier between the recordable template layer and the environment. It is specifically formulated to be resistant to oxygen penetration while maintaining thinness for resolution. This intermediary layer blocks oxygen from reaching the sensitive diazo compounds in the recordable template layer during the exposure process, preventing oxygen attack without requiring thick layers that would compromise resolution.
3Manufacturing precision
If a thin intermediate layer is used to improve resolution, then halftone dot resolution is improved, but wrinkling occurs during manufacturing
Solution Approach 1:
By segmenting the intermediate layer into two separate layers, the patent eliminates wrinkling issues. The second intermediate layer, being in direct contact with the relief layer, provides sufficient thickness and mechanical support to prevent wrinkling during handling and manufacturing. The first intermediate layer remains thin for resolution but is supported by the second layer, preventing wrinkles from forming at the interface with the recordable template layer.
4Manufacturing precision
If a thin intermediate layer is used to improve resolution, then halftone dot resolution is improved, but adhesion control becomes difficult
Solution Approach 1:
The segmentation of the intermediate layer into two distinct layers with different adhesion characteristics allows independent optimization of adhesion properties. The second intermediate layer is specifically formulated to provide controlled adhesion to the relief layer, facilitating easy removal of the recordable template layer after exposure. This separation of adhesion functions from the thin first layer enables proper adhesion control without compromising resolution.
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 improves halftone dot resolution, reduces oxygen attack, and ensures easy removal of the template layer, resulting in improved processing and aging resistance of the printing plates, capable of producing high-resolution flexographic printing plates with reduced wrinkles and enhanced uniformity.
Implementation Method 1
a first composite layer (C1) is a barrier layer arranged between the second composite layer (C2) and the recordable template layer (D) against the diazonium compounds contained in the recordable template layer (D)
Implementation Method 2
a photopolymerizable layer/relief-forming polymer layer (B) that is soluble in organic and/or aqueous solvents and/or becomes liquid upon heating and/or volatile, and that can be crosslinked by actinic radiation
Implementation Method 3
a recording-capable template layer (D) comprising a monomeric diazonium compound that is photosensitive to actinic laser radiation and undergoes a change in actinic density by development
Data Source
Figure 1
Figure 2
AI summary
Described is a recording element suitable for the production of high-resolution flexographic printing plates by digital information transfer and imageable with actinic laser radiation, which contains or consists of the following layers: (A) a carrier film, (B) a photopolymerizable layer/relief-forming polymer layer that can be crosslinked by actinic radiation, (C) an intermediate layer composite transparent to actinic radiation, consisting of at least two polymer-containing layers arranged one above the other, a first composite layer (C1) that acts as a barrier layer, and a second composite layer (C2) that modulates adhesion to the relief-forming polymer layer, (D) a recording-capable template layer comprising a monomeric diazonium compound, and (El) optionally a removable protective or cover film arranged on the recording-capable template layer (D).