Thermal Development Apparatus for Flexographic Printing Plates
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Solution Overview
Problem
Thin flexographic printing plates tend to wrinkle during thermal development, affecting print quality.
Innovation Solution
An improved thermal development apparatus and method that includes a resilient compressible layer between the support and the printing element, with a heated roll and absorbent material to soften and remove uncured photopolymer without causing wrinkles, using a system that supports and rotates the printing element and optionally exposes it to actinic radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal development is applied to thin flexographic printing plates, then uncured photopolymer is effectively removed, but the plates tend to wrinkle affecting print quality
Solution Approach 1:
A resilient compressible layer is placed between the support means and the printing element before thermal development begins. This layer cushions the plate during heating and pressing, preventing wrinkles from forming in the first place while still allowing effective thermal development of the uncured photopolymer.
Solution Approach 2:
The resilient compressible layer acts as an intermediary between the rigid support means and the thin printing element. It mediates the mechanical stress during thermal development, distributing pressure evenly and preventing direct contact that would cause wrinkling, while still transmitting sufficient heat and pressure for effective development.
2Stability of the object's composition
If a resilient compressible layer is added to prevent wrinkling, then plate stability is improved, but device complexity increases
Solution Approach 1:
The resilient compressible layer can be implemented as a porous or foam material that provides cushioning and stability. These materials are commercially available and can be easily integrated into existing thermal development apparatus without requiring complex mechanical modifications.
Solution Approach 2:
The resilient layer changes its physical parameters (compression, resilience) in response to the thermal development process. It compresses under heat and pressure to conform to the plate surface, providing adaptive support that maintains stability without requiring active control mechanisms or complex device architecture.
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 apparatus effectively minimizes or eliminates wrinkling of the printing plates, ensuring high-quality prints by maintaining contact and using a resilient compressible layer to absorb pressure variations and allow for slippage, thus maintaining image fidelity.
Implementation Method 1
selectively exposing the photocurable material to actinic radiation, which exposure acts to harden or crosslink the photocurable material in the irradiated areas
Implementation Method 2
means for softening or melting non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element
Implementation Method 3
at least one roll that is contactable with the imaged and exposed surface of the flexographic printing element and capable of moving over at least a portion of the imaged and exposed surface to remove the softened or melted non-crosslinked photopolymer
Data Source
Figure 1
AI summary
Apparatus for thermally developing a flexographic printing element to reveal a relief image on the surface and a method to develop a flexographic printing element. The method includes softening or melting a crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element. The apparatus includes a roll that contacts the imaged surface of the flexographic printing element and moves over the imaged surface of the flexographic printing element to remove the softened or melted non-crosslinked photopolymer on the imaged and exposed surface of the flexographic printing element. The non-crosslinked photopolymer is softened or melted using a heater adjacent to the imaged surface of the flexographic printing element, or by heating the one roll that contacts the surface of the printing element. Optionally the apparatus a device to cure the imaged surface of the flexographic printing element prior to thermal development.