White Ink Drying with Small Heating Roller
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Solution Overview
Problem
Existing image forming methods struggle to achieve high lightness in white solid portions on recording media while preventing cockling of thin paper, which degrades the quality of printed matter.
Innovation Solution
An image forming method involving the application of white ink containing hollow resin particulate to a recording medium, followed by contact with a heating roller of 200 mm or less in diameter, which enhances drying and prevents cockling by ensuring close contact over the entire width of the medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white ink containing hollow resin particulate is applied to a recording medium, then lightness of white solid portions is improved, but cockling of thin paper occurs
Solution Approach 1:
The heating roller is introduced to perform preliminary drying action on the white ink before the recording medium completes its transport. This preliminary action removes excess moisture that would otherwise cause cockling, allowing the hollow resin particulate to maintain its lightness-enhancing properties without the harmful swelling effect
Solution Approach 2:
The diameter of the heating roller is specifically controlled to be 200 mm or less, which changes the physical parameter of the heating device to achieve optimal contact pressure and drying efficiency. This parameter change enables effective moisture removal while maintaining sufficient contact with the thin recording medium without causing deformation
2Productivity
If a heating roller with diameter of 200 mm or less is used, then drying efficiency is improved and cockling is prevented, but contact area with recording medium is reduced
Solution Approach 1:
The heating roller diameter is optimized to 200 mm or less, which changes the geometric parameter to achieve the optimal balance between drying efficiency and contact area. The smaller diameter enables the roller to conform to thin recording media while maintaining sufficient surface area for effective heat transfer and moisture evaporation
Solution Approach 2:
The cylindrical shape of the heating roller provides curved surface contact that naturally adapts to the recording medium. This curvature allows the roller to maintain contact across the width of thin paper while the controlled diameter ensures adequate drying efficiency without excessive contact pressure that would cause cockling
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 method produces images with high lightness and prevents cockling of thin paper, maintaining the smoothness and quality of the recording medium.
Implementation Method 1
contacting a heating roller having a diameter of 200 mm or less with a first surface of the recording medium
Implementation Method 2
white liquid ink containing hollow resin particulate, which has a small specific gravity and does not easily precipitate, in terms of enhancement of transparency of the transparent recording medium or coloring property of the color ink
Data Source
AI summary
An image forming method includes applying white ink containing hollow resin particulate to a recording medium and contacting a heating roller having a diameter of 200 mm or less with a first surface of the recording medium.