Fluororesin Guide Roller Coating for Ink Jet Image Quality
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Solution Overview
Problem
Ink jet recording methods face issues of image defects and decreased jettability due to the use of heating drying devices that come into contact with the ink-applied surface, which can lead to scratches and clogging of the ink jet head.
Innovation Solution
An ink jet recording method and device that uses a heating drying device with a heating roller contacting the ink non-applied surface and a guide roller contacting the ink-applied surface, where the ink contains specific ratios of acrylic resin acid value and kinetic friction coefficient of the guide roller, along with a fluororesin surface layer, to suppress image defects and maintain jettability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a guide roller contacts the ink-applied surface to guide the recording medium, then the recording medium can be transported and dried, but image defects occur due to contact with the ink surface
Solution Approach 1:
The invention changes the surface property parameter of the guide roller by coating it with a fluororesin, which has low surface energy and reduced friction. This parameter change allows the guide roller to contact the ink-applied surface without causing image defects, as the fluororesin layer prevents direct interaction between the roller material and the ink while maintaining the guiding function.
Solution Approach 2:
The guide roller is constructed as a composite structure with a fluororesin coating layer on its surface. This composite material approach combines the mechanical strength of the roller substrate with the low-friction, non-stick properties of the fluororesin layer, enabling the roller to guide the recording medium without degrading image quality.
2Manufacturing precision
If the kinetic friction coefficient of the guide roller is reduced to suppress image defects, then image quality improves, but the product of acrylic resin acid value and friction coefficient must be controlled within a specific range
Solution Approach 1:
The invention establishes a quantitative relationship between the acrylic resin acid value and the kinetic friction coefficient of the guide roller, defining a specific product range (0.003 to 0.015). This parameter control approach allows optimization of image quality by reducing friction while maintaining ink jet head performance, providing a clear design guideline for material selection.
3Productivity
If heating temperature is increased to improve drying efficiency, then productivity increases, but image defects may occur due to excessive heating
Solution Approach 1:
The invention optimizes the heating temperature parameter within a specific range (40°C to 80°C) to achieve effective drying while preventing image defects. This parameter control ensures that the heating process removes excess ink efficiently without causing thermal damage or distortion to the recorded image.
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 effectively suppresses image defects and maintains ink jettability by optimizing the product of acrylic resin acid value and kinetic friction coefficient, allowing efficient heating and drying while reducing contact-related issues.
Implementation Method 1
a heating roller configured to come into contact with an ink non-applied surface in the recording medium to which the ink is applied and to heat the ink applied to the recording medium through the recording medium
Implementation Method 2
a guide roller configured to come into contact with an ink-applied surface in the recording medium to which the ink is applied and to guide the recording medium to which the ink is applied
Data Source
AI summary
Provided is an ink jet recording method including: applying ink; and heating and drying the ink, in which the heating and drying of the ink is performed using a heating drying device, the heating drying device includes a heating roller and a guide roller configured to come into contact with the ink applied to a recording medium and to guide the recording medium such that an ink non-applied surface in the recording medium comes into contact with the heating roller, the ink contains water, a pigment, a pigment dispersing resin, and an acrylic resin as a resin other than the pigment dispersing resin, and a product of an acid value A mgKOH/g of the acrylic resin and a kinetic friction coefficient B of an outer peripheral surface of the guide roller is 1.0 to 5.0.