Mask Element Precursor for Flexographic Printing
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Solution Overview
Problem
Existing methods for making mask elements in flexographic printing struggle with efficient production, interlayer adhesion, and intimate contact between the mask element and relief-forming precursor during imaging, leading to poorer imaging quality and potential contamination.
Innovation Solution
An imageable material comprising a transparent polymeric carrier sheet, a non-ablatable light-to-heat converting (LTHC) layer with infrared radiation absorbing material and thermally crosslinked organic binder, and a non-silver halide thermally-ablatable imaging layer, which improves adhesion and contact during lamination and vacuum draw-down processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mask element precursors are used with lamination or vacuum draw-down processes, then mask element production is achieved, but interlayer adhesion is insufficient and intimate contact between mask element and relief-forming precursor is poor
Solution Approach 1:
The patent modifies the physical and chemical parameters of the mask element precursor by incorporating a light-to-heat converting layer with specific infrared absorbing materials and thermally crosslinked binders. This changes the thermal properties of the mask element, enabling it to adhere reliably to the relief-forming precursor through controlled thermal bonding during the lamination or vacuum draw-down process, thereby improving both interlayer adhesion and contact quality.
Solution Approach 2:
The patent employs a composite mask element precursor structure consisting of multiple functional layers: a carrier sheet, a light-to-heat converting layer containing infrared absorbing materials and thermally crosslinked binders, and an imaging layer. This composite structure integrates materials with different properties to achieve both reliable adhesion and precise intimate contact with the relief-forming precursor, resolving the contradiction between adhesion strength and contact quality.
2Manufacturing precision
If conventional imaging processes are used, then relief images are formed, but contamination and artifacts occur due to poor contact
Solution Approach 1:
The patent employs a disposable mask element precursor that is discarded after a single use. This approach eliminates the need for cleaning and reuse, thereby preventing contamination and artifacts that would otherwise occur during repeated use. The mask element is designed for single-use imaging, ensuring high imaging quality without the harmful effects of contamination and artifacts associated with reusable components.
3Productivity
If existing mask element precursors are used, then production is achieved, but production efficiency is low
Solution Approach 1:
The patent incorporates a light-to-heat converting layer that actively participates in the imaging process by converting incident light energy into heat, which then drives the ablation of the imaging layer. This self-service mechanism eliminates the need for separate heating steps or complex thermal control systems, thereby improving production efficiency while maintaining ease of manufacture. The mask element precursor performs its own thermal conversion function, streamlining the overall production process.
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
Enhances interlayer adhesion and intimate contact, reducing contamination and artifacts, and improving the quality of relief images by ensuring complete optical contact and effective ablation during imaging.
Implementation Method 1
a non-ablatable light-to-heat converting (LTHC) layer disposed directly on the transparent polymeric carrier sheet, the LTHC layer having an average dry thickness of at least 1 μm and up to and including 5 μm, and comprising: (i) a first infrared radiation absorbing material
Implementation Method 2
a thermally crosslinked organic polymeric binder material
Implementation Method 3
a non-silver halide thermally-ablatable imaging layer (IL) disposed directly on the LTHC layer
Implementation Method 4
the IL comprising a second infrared radiation absorbing material and a UV-light absorbing material dispersed within one or more thermally-ablatable polymeric binder materials
Data Source
AI summary
An imageable material can be used to form a mask element that in turn is useful for providing relief images such as in flexographic printing plates. The imageable material has, in order: (a) a transparent polymeric carrier sheet; (b) a non-ablatable light-to-heat converting having an average dry thickness of 1-5 μm and comprising: (i) an infrared radiation absorbing material at 0.1-5 weight %; (ii) a thermally crosslinked organic polymeric binder material; and (iii) non-thermally ablatable particles having an average particle size of 0.1-20 μm in an amount of 0.2-10 weight %; and (c) a non-silver halide thermally-ablatable imaging layer (IL) disposed on the LTHC layer, the IL comprising a second infrared radiation absorbing material and a UV-light absorbing material dispersed within one or more thermally-ablatable polymeric binder materials.