Screen Printing Ink Composition for Thick Gasket Surface Flatness
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Solution Overview
Problem
Screen printing methods using non-crosslinked rubber materials face challenges in producing thick gaskets due to ink adhesion and print sagging, which can result in defects and rough surfaces.
Innovation Solution
An ink composition for screen printing is developed, comprising a rubber-forming component, a crosslinking agent, a main solvent that dissolves the rubber-forming component, and a poor solvent that dissolves in the main solvent but not in the rubber-forming component, with specific viscosity and loss tangent ranges to improve cohesion and extrudability, reducing adhesion to screens and preventing print sagging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an ink composition having a relatively low viscosity is used for screen printing to form thick gaskets, then the ink composition can be easily extruded, but the ink composition is likely to adhere to the screen mask and printing defects such as print sagging are likely to occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the viscosity of the ink composition within the range of 300 to 50000 Pa·s and the loss tangent within 10 to 20. This optimization balances the extrudability through the screen mask with the prevention of printing defects, resolving the contradiction between ease of operation and manufacturing precision.
2Manufacturing precision
If an ink composition having a high thixotropic property or high viscosity is used for screen printing, then printing defects such as adhesion to screen mask are reduced, but rough surface portions such as mesh marks are likely to be generated on the surface of the gasket
Solution Approach 1:
The patent optimizes the loss tangent parameter within the range of 10 to 20, which controls the thixotropic properties of the ink composition. This parameter optimization ensures that the ink has sufficient viscosity to prevent screen mask adhesion and printing defects, while maintaining surface flatness by preventing mesh mark formation during the screen printing process.
3Productivity
If screen printing is used to manufacture thick gaskets, then the production efficiency is improved, but ink adhesion to screen mask and print sagging occur resulting in defects
Solution Approach 1:
The patent achieves both high productivity and manufacturing precision by optimizing the viscosity range (300 to 50000 Pa·s) and loss tangent (10 to 20) of the ink composition. These parameter changes enable screen printing to efficiently produce thick gaskets while preventing ink adhesion to the screen mask and print sagging, thereby eliminating printing defects.
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 ink composition effectively suppresses printing defects and rough surface generation, enabling the production of thick gaskets with improved surface flatness and printability.
Implementation Method 1
a poor solvent that dissolves in the main solvent but does not dissolve in the rubber-forming component
Implementation Method 2
an ink composition having a high thixotropic property
Data Source
AI summary
Provided is an ink composition for screen printing that does not easily allow the generation of a printing defect or a rough surface portion in a printed matter even in the case of forming the printed matter having a thick thickness.An ink composition for screen printing containing (a) a rubber-forming component, (b) a crosslinking agent, (c) a main solvent that dissolves the rubber-forming component and (d) a poor solvent that dissolves in the main solvent but does not dissolve in the rubber-forming component, in which a viscosity (0.1/s) obtained with an E-type viscometer at a temperature of 25° C. is 300 to 50000 Pa·s, a viscosity (10/s) obtained with the E-type viscometer at a temperature of 25° C. is 50 to 1500 Pa·s, and a loss tangent (0.1 rad/s) obtained with the E-type viscometer at a temperature of 25° C. is 10 to 20.