Viscosity-Gradient Effect Varnish for Metallic Print Alignment
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Solution Overview
Problem
The integration of a gravure printing unit into a sheet-processing printing machine is challenging, and existing methods struggle to produce printed products with desired optical effects using effect varnishes and rough substrates, particularly with effect pigments that do not align properly.
Innovation Solution
A method involving the sequential application of three fluids with different viscosities, where a first fluid with higher viscosity forms a substrate or carrier layer, and a second fluid with lower viscosity, containing platelet-shaped effect pigments, is applied to improve optical effects, followed by optional application of a third fluid, using combinations of flexographic, gravure, and offset printing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a gravure printing unit is integrated into a sheet-fed printing press, then printed products with good metallic properties can be produced, but the integration is challenging and complex
Solution Approach 1:
The patent combines gravure printing and flexographic printing into a single integrated printing press system. The gravure printing unit and flexographic printing unit are merged to work in sequence on the same printing substrate, allowing the substrate to receive both gravure-printed effect varnish with metallic properties and flexographically printed additional layers, thereby achieving good metallic properties while utilizing a unified printing system
Solution Approach 2:
The printing process is segmented into distinct stages: first, the gravure printing unit applies effect varnish to create a base layer with metallic properties; second, the flexographic printing unit applies additional printing layers on top. This segmentation allows each printing unit to perform its specialized function while being integrated in a coordinated manner, reducing the complexity of trying to make a single unit do everything
2Ease of manufacture
If effect varnish is applied to a rough substrate, then the substrate can be processed, but the effect pigments cannot align as desired
Solution Approach 1:
The gravure printing unit first applies the effect varnish containing platelet-shaped effect pigments to the printing substrate before the flexographic printing unit applies additional layers. This preliminary action ensures that the effect pigments are deposited first on the substrate surface, creating a foundational layer with proper pigment alignment that subsequent printing layers will build upon, rather than trying to achieve alignment during or after the main printing process
3Ease of manufacture
If a first fluid layer is applied to the printing substrate, then a carrier layer is formed, but the effect pigments in the second fluid may not properly align or distribute
Solution Approach 1:
The patent specifies that the first fluid has a first viscosity and the second fluid has a second viscosity that is lower than the first viscosity. This parameter change in viscosity between the two fluids is crucial: the lower viscosity of the second fluid (effect fluid) allows the effect pigments to better align and distribute on the carrier layer formed by the first fluid, while the higher viscosity of the first fluid provides adequate carrier layer formation and support
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 enables the production of printed products with enhanced optical effects, such as improved metallic and pearlescent effects, in a simple and cost-effective manner by ensuring better alignment and drainage of effect pigments, thereby improving the overall quality of the printed products.
Implementation Method 1
the first fluid is provided as a fluid with a first viscosity and that the second fluid is provided as a fluid with a second viscosity—different from the first viscosity
Implementation Method 2
the second viscosity is lower than the first viscosity. The second fluid preferably has good flow properties or better flow properties than the first fluid. The second fluid preferably flows on the first fluid, i.e., it preferably forms a leveled layer, particularly preferably a continuous layer
Implementation Method 3
The effect pigments of the second fluid align particularly well on the smoothed or structured first fluid or on the layer formed by it, thereby enhancing the optical effect
Data Source
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AI summary
A method according to the invention for producing a printed product comprising the steps of: providing (40) and transporting a substrate (2), providing (42) a first fluid (10) and transferring the first fluid to the substrate, providing (45) a second fluid (12) – different from the first fluid – and transferring the second fluid to the substrate, wherein the second fluid is provided as an effect fluid (12) comprising a carrier fluid (12b) and platelet-shaped effect pigments (12c), and smoothing or structuring (43) the first fluid before transferring the effect fluid, is characterized in that the first fluid (10) is provided as a fluid with a first viscosity (42a) and that the second fluid (12) is provided as a fluid with a second viscosity (45a) – different from the first viscosity – wherein the second viscosity is lower than the first viscosity.The invention makes it possible to produce printed products with special optical effects in a simple and cost-effective manner. The invention is particularly useful in the production of highly finished printed products.