研究目的
To propose an empirical design procedure for a slot-die head to achieve uniform coating thickness in printed electronics, minimizing ink consumption and protecting components from exposure to oxygen and humidity.
研究成果
The empirical design procedure for a slot-die head with a shallow reservoir was successfully developed, achieving uniform coating thickness with minimal ink consumption. The design was validated through coating experiments, showing a deviation within ±1.7%. The method is readily applicable to the printed electronics industry, offering a practical solution for achieving uniform thin-film coatings.
研究不足
The study focuses on the design of the slot-die head and its impact on coating uniformity. It does not extensively cover the effects of varying process conditions, drying conditions, and external environmental factors on coating quality. Additionally, the empirical model may require adjustment for inks with significantly different viscosities or properties.
1：Experimental Design and Method Selection:
The research involved designing a slot-die head with a hanger-type reservoir to minimize ink consumption. The internal resistance values were calculated using experimental parameters from coating experiments, and these values were used in modeling the interior design of the slot-die head.
2：Sample Selection and Data Sources:
PEDOT:PSS ink was used for coating experiments on glass substrates. The viscosity of the ink was adjusted by mixing PEDOT:PSS with isopropanol (IPA).
3：List of Experimental Equipment and Materials:
Slot-die heads with various specifications were fabricated. The ink used was PEDOT:PSS (Orgacon EL-P5010 of AGFA USA) mixed with IPA.
4：Experimental Procedures and Operational Workflow:
Coating experiments were performed with varying discharge speeds, coating speeds, and drying conditions. The coating thickness was measured to assess uniformity.
5：Data Analysis Methods:
The coating thickness was measured at multiple points to calculate the deviation and assess the uniformity. The resistance values at the center and edges of the coating were compared to ensure uniformity.
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