Flexographic Printing Plates with Dual-Modulus Relief Layers
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Solution Overview
Problem
Existing flexographic printing plates face challenges in achieving stable ink laydown and halftone quality on paper packages with rough surfaces due to insufficient wear resistance and mechanical integrity under printing pressure, and previous solutions either compromise mechanical properties or incur high costs.
Innovation Solution
A flexographic printing plate design with specific dynamic elasticity regions (A1, B1, and optionally C1) defined by storage modulus ranges, optimized through atomic force microscopy (AFM) mapping, ensuring balanced mechanical properties for stable printing on paper packages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the degree of resin cross-linking is kept low to achieve low hardness for improved ink laydown, then ink transfer to paper packages is improved, but mechanical characteristics of the flexographic printing plate are impaired
Solution Approach 1:
The patent applies parameter changes by precisely controlling the resin cross-linking degree within 5-50% to optimize the balance between hardness and flexibility. This parameter optimization enables the printing plate to achieve both good ink laydown on rough paper surfaces and sufficient mechanical strength for durability
Solution Approach 2:
The patent uses composite materials by combining specific resin components including polyolefin resin, polyester resin, and acrylic resin in defined proportions. This composite formulation achieves the desired mechanical properties and ink transfer characteristics that cannot be obtained with single materials
2Ease of operation
If printing pressure is elevated to improve ink laydown on rough surfaces, then ink transfer is improved, but poor printing occurs due to collapse or chipping of micropattern
Solution Approach 1:
The patent applies parameter changes by optimizing the elastic modulus and hardness of the printing plate to specific ranges. This enables the plate to withstand elevated printing pressures without micropattern collapse while maintaining good ink laydown on rough paper surfaces
3Object-affected harmful factors
If a water developer is used to reduce organic solvent usage, then environmental performance is improved, but wear resistance of the printing plate is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition and cross-linking density of the photosensitive resin layer. This enables the use of environmentally friendly water-based developers while achieving sufficient wear resistance for practical printing applications
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 optimized printing plate achieves stable ink laydown and halftone quality on paper packages under printing pressure, enhancing wear resistance and maintaining mechanical integrity.
Implementation Method 1
a photopolymerization initiator (iv), wherein the polymer particles (i) comprise: an aromatic vinyl compound; and a conjugated diene compound, as monomer units constituting the polymer particles (i)
Data Source
AI summary
The present disclosure provides a flexographic printing plate containing at least: a support; and a relief layer sequentially stacked, wherein in dynamic elasticity mapping measurement by AFM on a cross section obtained by cutting 1 μm from a surface layer of a face on the side opposite to a face where the relief layer is in contact with the support, the cross section has at least: a region (A1) having a storage modulus of 100 MPa or more and 500 MPa or less at a frequency of 2,000 Hz; and a region (B1) having a storage modulus of 3 MPa or more and 15 MPa or less at a frequency of 2,000 Hz.