Vulcanizate Printing Layer for Flexographic Ink Transfer
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Solution Overview
Problem
Current photopolymer-based printing layers in flexographic and letterpress printing are complex to produce, require frequent adjustments due to dynamic rigidity, exhibit low ink transfer, and are prone to errors during mounting, limiting format versatility and increasing production complexity.
Innovation Solution
A multi-layer fabric with a vulcanizate-based printing layer, comprising rubber components crosslinked using sulfur or peroxides, directly on a compressible layer which contacts a reinforcement layer, simplifying the production process and enhancing ink transfer by using thermoplastic-free or thermoplastic vulcanizates like EPDM, EPM, SBR, BR, CR, or NBR, and allowing for fewer process steps and improved registration accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photopolymer printing layer is used, then the printing layer can be crosslinked by light irradiation, but the production process becomes very complex and requires multiple work steps
Solution Approach 1:
The patent changes the material parameter from photopolymer to vulcanizate, which fundamentally alters the crosslinking mechanism from light irradiation to thermal or radiation vulcanization. This material substitution simplifies the production process while maintaining reliable crosslinking, as vulcanizate can be directly applied and cured without complex photopolymer processing steps.
Solution Approach 2:
The patent replaces the photopolymer system with a vulcanizate system that uses thermal or radiation energy for crosslinking instead of mechanical/light-based photopolymerization. This substitution eliminates the need for complex light irradiation equipment and multi-step processing, reducing overall device and process complexity.
2Reliability
If a photopolymer printing layer is used, then the printing layer can be formed through photopolymerization, but the contact pressure must be adjusted at different printing speeds due to dynamic rigidity
Solution Approach 1:
The patent changes the material's mechanical parameters by using vulcanizate instead of photopolymer. Vulcanizate provides more stable and predictable contact pressure characteristics across different printing speeds, eliminating the need for frequent pressure adjustments. The material's inherent properties allow consistent performance without operational complexity.
3Reliability
If a photopolymer printing layer is used, then the printing layer can be crosslinked by light, but the ink transfer is low
Solution Approach 1:
The patent changes the material composition from photopolymer to vulcanizate, which fundamentally improves ink transfer properties. Vulcanizate provides superior ink absorption and transfer characteristics while maintaining complete crosslinking, thereby increasing productivity without sacrificing reliability.
4Reliability
If a photopolymer printing layer is used, then the printing layer can be mounted as a sheet, but errors occur during mounting and limits to training as roll goods
Solution Approach 1:
The patent changes the material form and properties from photopolymer sheet to vulcanizate layer. This transformation eliminates mounting errors and simplifies the manufacturing process, as vulcanizate can be directly applied and cured without complex mounting operations. The material's properties allow for easier manufacturing and reduced error rates.
5Reliability
If a photopolymer printing layer is used, then the printing layer can be created through photopolymerization, but the end user has to have different formats in stock
Solution Approach 1:
The patent changes the material to vulcanizate, which provides better adaptability and versatility for different printing formats. The material's properties allow for flexible application and consistent performance across various formats, eliminating the need for users to maintain multiple format inventories while preserving printing quality.
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 vulcanizate-based printing layer reduces production complexity, ensures 100% registration accuracy, and enhances ink transfer and color intensity, with fewer required process steps and improved reproducibility, as demonstrated by comparative tests showing superior performance over traditional photopolymer layers.
Implementation Method 1
A vulcanizate is characterized by elastic properties. Depending on the type of rubber used, crosslinking takes place using sulfur (e.g. with NR) or peroxides (e.g. with EPDM).
Implementation Method 2
The compressible layer - also called compression layer - serves to avoid a flexing process by reducing the volume in the pressure zone and to compensate for differences in indentation.
Implementation Method 3
Finally, a printing relief is engraved into the networked print layer using a laser.
Data Source
Figure 1~3
AI summary
The invention relates to a multiple-layer flat structure (1) in the form of a printing blanket or a printing plate for flexographic and letterpress printing with: - a printing layer (2) which is made from a polymeric material and is provided with laser engraving; - at least one compressible layer (3), and - at least one strength-support layer (4); wherein the individual layers form an adhesive connection among one another. The multiple-layer flat structure (1) according to the invention is distinguished by the fact that the polymeric material of the printing layer (2) is a vulcanisate. Advantageous materials are proposed in this regard. The printing layer (2) expediently lies directly on a compressible layer (3). The compressible layer (3) is in turn in direct contact with a strength-support layer (4).