Dry Coating Flexographic Plates via Solid Powder Transfer
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Solution Overview
Problem
Traditional liquid coating methods for flexographic plates are inefficient, environmentally harmful, and costly, with issues including the use of volatile and toxic solvents, limited solvent choices, temperature-dependent drying, and difficulties in achieving uniform coatings, especially at plate edges.
Innovation Solution
A dry, solvent-free process for transferring a solid ink receptive coating onto flexographic plates using a sacrificial surface, allowing for controlled film formation and adhesion, enabling high-quality ink-jet printing without damaging the plates and minimizing VOC emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid coating methods are used to coat flexographic plates, then coating application is achieved, but volatile and toxic solvents are used causing environmental contamination
Solution Approach 1:
The invention changes the fundamental parameter of the coating medium from liquid (solvent-based) to solid (powder-based) form. The coating composition is applied as a dry powder mixture containing polymer particles, monomers, and catalysts, eliminating the need for volatile solvents entirely. This parameter change resolves the contradiction by maintaining coating applicability while completely removing VOC emissions associated with traditional liquid coating methods.
Solution Approach 2:
The invention replaces the mechanical/chemical solvent-based coating system with a dry powder deposition system. Instead of using liquid solvents to carry coating materials and then evaporating them, the process deposits solid powder particles that undergo in-situ polymerization. This substitution eliminates the harmful mechanical evaporation process and associated VOC emissions while achieving the same coating function.
2Ease of manufacture
If liquid coating methods are used, then coating materials can be applied, but high temperatures are required for drying causing photopolymer deformation
Solution Approach 1:
The invention changes the drying parameter from high temperature thermal evaporation to low temperature or ambient temperature polymerization. The coating powder contains monomers and catalysts that enable polymerization at low temperatures, eliminating the need for high-temperature drying that causes photopolymer deformation. This parameter change resolves the contradiction by achieving complete coating formation without thermal damage to the plate surface.
Solution Approach 2:
The invention replaces the liquid-to-vapor phase transition (evaporation) with a solid-to-solid chemical transformation (polymerization). The coating materials transition from discrete powder particles to a continuous polymer network through chemical reaction rather than thermal evaporation. This phase transition substitution eliminates high-temperature requirements and protects the photopolymer surface from thermal deformation while achieving complete coating formation.
3Ease of manufacture
If liquid coating methods are used, then coating can be applied to flexographic plates, but coating uniformity and homogeneity are difficult to control especially at plate edges
Solution Approach 1:
The invention replaces the liquid flow-based coating system with a dry powder deposition system. The powder coating process eliminates capillary action, surface tension, and liquid pooling effects that cause non-uniform coating distribution, especially at plate edges. The powder particles are deposited and polymerized in a controlled manner that ensures uniform coating thickness and composition across the entire plate surface, resolving the uniformity control difficulties of liquid coating methods.
4Ease of manufacture
If liquid coating methods are used, then coating process can be completed, but multiple solvents must be selected carefully to avoid damaging the plate surface
Solution Approach 1:
The invention extracts and removes the solvent component entirely from the coating system. By formulating the coating as a dry powder mixture of polymer particles, monomers, and catalysts without liquid solvents, the process eliminates the complex task of solvent selection and compatibility testing. This extraction resolves the contradiction by simplifying the coating formulation while completely avoiding the risk of plate surface damage from improper solvent choice.
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 process improves plate and print quality, reduces machine costs, simplifies maintenance, and enables cost-effective short runs while being environmentally friendly by eliminating solvent use and improving coating uniformity and stability.
Implementation Method 1
permit a chemical reaction of the solid film, having been transferred onto the flexographic plate surface, with an ink-jet ink droplet printed thereon, to cause the freezing of the ink droplet
Data Source
AI summary
Provided is a process for dry, solvent free, transfer of solid material onto a flexographic plate.