Flexographic Printing Plate Photosensitive Resin Ink Transfer
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Solution Overview
Problem
Flexographic printing plates face challenges in achieving both ink filling inhibition and ink transferability, especially on low-grade corrugated boards with rough surfaces, due to the complexity of determining optimal microcell arrangements and the trade-off between surface deformation and cross-linking properties.
Innovation Solution
A flexographic printing original plate with a support and a photosensitive resin composition layer containing a specific block copolymer thermoplastic elastomer, polybutadiene plasticizer, and photopolymerization initiator, which balances ink transferability and durability by reducing intermolecular cohesion and cross-linking, eliminating the need for microcell formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcells are formed on the surface of the printing plate by laser drawing technique to increase surface area and improve ink transferability, then ink transferability is improved, but the process becomes complicated requiring many verifications and different arrangement patterns for different ink types
Solution Approach 1:
The invention changes the chemical composition parameters of the photosensitive resin layer by incorporating specific block copolymers (poly(styrene-co-butadiene) with defined molecular weights and compositions) and plasticizers (polybutadiene with specific cis-1,4-structure content). This chemical parameter modification enables the material itself to provide both ink transferability and filling inhibition without requiring complex surface structuring processes.
Solution Approach 2:
The invention extracts and eliminates the need for laser drawing microcell formation and complex arrangement pattern verifications by incorporating the desired surface properties directly into the photosensitive resin composition. The specific polymer and plasticizer combination provides the necessary surface characteristics inherently, removing the complicated post-processing steps.
2Reliability
If the surface area of the printing plate is increased by forming microcells to improve ink transferability, then ink transferability is improved, but ink filling inhibition becomes difficult to achieve
Solution Approach 1:
The invention uses a composite photosensitive resin system combining block copolymer (poly(styrene-co-butadiene)) with specific plasticizer (polybutadiene). This composite material structure enables simultaneous achievement of ink transferability through controlled surface properties and ink filling inhibition through the cross-linking characteristics of the composite system, eliminating the need for separate microcell formation processes.
3Ease of manufacture
If conventional photosensitive resin composition is used without specific block copolymer and plasticizer, then manufacturing is simpler, but ink transferability and durability cannot be simultaneously achieved on low-grade corrugated board
Solution Approach 1:
The invention modifies the chemical composition parameters of the photosensitive resin layer by incorporating specific block copolymers (poly(styrene-co-butadiene) with defined molecular weights and compositions) and plasticizers (polybutadiene with specific cis-1,4-structure content). This chemical parameter modification enables the material itself to provide both ink transferability and filling inhibition without requiring complex surface structuring processes.
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 solution enables high productivity in plate-making while achieving both ink filling inhibition and ink transferability on low-grade corrugated boards, maintaining durability over long-term storage without the complexity of microcell arrangement determination.
Implementation Method 1
a photopolymerization initiator (c)... a photopolymerizable unsaturated monomer (b)... performing UV irradiation from a side of the support; a step of performing pattern exposure by UV irradiation on the photosensitive resin composition layer
Data Source
AI summary
The present invention provides a printing plate capable of attaining both ink filling inhibition and ink transferability in printing on low grade corrugated board, and a flexographic printing original plate having high productivity in plate-making. The flexographic printing original plate includes a support, and a photosensitive resin composition layer stacked on the support, and the photosensitive resin composition layer contains a thermoplastic elastomer (a) having a specific structure, a photopolymerizable unsaturated monomer (b), a photopolymerization initiator (c), and a plasticizer (d) having a specific structure.