Textured Roller Surface Texture Transfer Flexographic Printing
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Solution Overview
Problem
Current flexographic printing technologies face challenges in creating a cost-effective and simple method for texturing relief image printing elements, particularly due to the use of consumable barrier layers which increase costs and complexity.
Innovation Solution
A method involving a textured roller and a backing roller to transfer a defined topographical pattern onto a photosensitive printing blank with a laser ablatable mask layer, eliminating the need for intermediary membranes and complex photopolymer formulations, where the roller imparts texture and heat to the photocurable layer, followed by actinic radiation exposure to cure the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a textured roller is used to transfer topographical pattern directly to the photocurable layer, then manufacturing complexity is reduced and cost is decreased, but surface texture quality and ink transfer properties must be maintained
Solution Approach 1:
The invention extracts and eliminates the intermediary barrier layer from the texturing process. By removing this intermediate membrane that previously mediated between the textured roller and photocurable layer, the system achieves direct texture transfer, reducing manufacturing steps and complexity while maintaining surface quality through direct contact between the roller and photopolymer layer
Solution Approach 2:
The invention employs asymmetric pressure application through the textured roller, where the roller applies localized pressure and heat to specific areas of the photocurable layer during rotation. This asymmetric thermal-mechanical treatment enables precise topographical pattern transfer while maintaining overall process simplicity
2Manufacturing precision
If consumable barrier layers are used for texturing, then surface texture can be achieved, but manufacturing cost and process complexity increase
Solution Approach 1:
The invention replaces expensive consumable barrier layers with a durable, reusable textured roller. The roller's hardened surface can be repeatedly used to transfer topographical patterns without degrading, eliminating the need for continuous purchase and replacement of barrier membranes, thereby significantly reducing manufacturing costs while maintaining surface texture quality
Solution Approach 2:
The invention changes the physical state and properties of the photocurable layer by applying controlled heat and pressure through the textured roller. This thermal-mechanical parameter modification enables the photopolymer to temporarily become more pliable, allowing precise topographical pattern transfer, then returns to its original state for subsequent UV curing, achieving surface texture control without consumable layers
3Manufacturing precision
If intermediary membranes are used in the texturing process, then texture transfer is possible, but manufacturing steps and equipment requirements increase
Solution Approach 1:
The invention merges multiple functions into the textured roller itself: the roller simultaneously provides the topographical pattern, applies localized pressure, delivers controlled heat, and enables direct contact with the photocurable layer. This consolidation eliminates the need for separate intermediary membranes and reduces the number of manufacturing steps while maintaining precise pattern transfer capability
Solution Approach 2:
The textured roller serves multiple functions: it acts as the texturing tool, the heating element, the pressure application device, and the direct interface with the photocurable layer. This multi-functional design eliminates the need for separate barrier layers and auxiliary equipment, simplifying the overall manufacturing process while achieving precise surface texture control
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 simplifies and cost-reduces the texturing process, enhancing surface roughness control, improving ink transfer properties and print quality while reducing manufacturing steps and equipment requirements.
Implementation Method 1
the roller imparts texture and heat to the photocurable layer
Implementation Method 2
exposing the at least one photocurable layer to at least one source of actinic radiation through the in situ mask to selectively cross link and cure the portions of the at least one photocurable layer not covered by the in situ mask
Implementation Method 3
the laser ablatable mask layer is selectively laser ablated to create an in situ mask and uncover portions of the at least one photocurable layer
Data Source
AI summary
A method of making a relief image printing element from a photosensitive printing blank is described. The photosensitive printing blank comprises a laser ablatable mask layer disposed on at least one photocurable layer and the laser ablatable mask layer is selectively laser ablated to create an in situ mask and uncover portions of the at least one photocurable layer. The method includes a) pushing the photosensitive printing blank through a nip formed by a textured roller and a backing roller, wherein the textured roller contacts the in situ mask and the uncovered portions of the at least one photocurable layer; and b) exposing the at least one photocurable layer to at least one source of actinic radiation through the in situ mask to selectively cross link and cure the portions of the at least one photocurable layer not covered by the in situ mask. A defined topographical pattern is transferred from the textured surface of the roller to the at least one photocurable layer.