Screen Printing Ink Composition for Thick Gasket Surface Quality
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Solution Overview
Problem
In screen printing, forming gaskets with a thick thickness using ink compositions with low viscosity results in adhesion issues with the screen mask, leading to print sagging and rough surface defects.
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 reduce adhesion to the screen mask.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an ink composition with low viscosity is used for screen printing, then the ink composition can be easily extruded, but the ink composition adheres to the screen mask causing print sagging and rough surface defects
Solution Approach 1:
The patent applies parameter changes by precisely controlling the viscosity of the ink composition within a specific range (30-500 cP at 25°C) and adjusting the loss tangent to 10 or higher. These parameter optimizations enable the ink to be easily extruded through the screen mask while preventing adhesion issues, thereby resolving the contradiction between ease of operation and manufacturing precision.
2Productivity
If screen printing is used to manufacture gaskets with thick thickness, then production efficiency is improved, but printing defects occur due to ink adhesion and extrusion difficulties
Solution Approach 1:
The patent enables thick gasket manufacturing through screen printing by optimizing the ink composition parameters: viscosity controlled at 30-500 cP and loss tangent at 10 or higher. These parameter changes allow the ink to be easily extruded for thick deposits while preventing adhesion to the screen mask, thus achieving both high productivity and print 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 ink composition effectively suppresses the generation of printing defects and rough surface portions, even when forming gaskets with thick thicknesses, by improving extrudability and leveling properties while maintaining 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
Figure 1~2
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.