Guide Roller Surface Roughness for Liquid Peeling Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drying devices for continuous sheets, such as printers, face issues with liquid peeling and image defects due to insufficient drying, leading to increased drying time and potential for liquid to come off during conveyance, especially when guide rollers with inappropriate surface roughness contact the partially dried sheets.
Innovation Solution
Incorporating guide rollers with surface roughness of 2 to 8 micrometers to prevent liquid peeling and ensure proper drying without defects, while maintaining a higher conveying speed by using rollers like ceramic spray or metal spray rollers, which reduce the likelihood of liquid adhering to the rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guide rollers with smooth surface contact the drying target object, then liquid adheres to the rollers causing peeling, but using rougher rollers prevents adhesion while potentially causing other issues
Solution Approach 1:
The patent applies parameter change by optimizing the surface roughness of guide rollers to a specific range (Ra 2-8 μm). This parameter optimization prevents liquid adhesion to the rollers while maintaining image quality, resolving the contradiction between preventing peeling and preserving manufacturing precision.
Solution Approach 2:
The patent applies local quality by treating only the surface of the guide rollers with specific roughness characteristics while keeping other components unchanged. This localized modification to the roller surface properties prevents liquid adhesion without affecting other aspects of the drying device.
2Reliability
If drying time is extended to ensure complete drying, then liquid peeling is prevented, but productivity decreases
Solution Approach 1:
The patent applies preliminary action by pre-treating the guide roller surfaces with specific roughness before the drying process begins. This preliminary surface preparation prevents liquid adhesion during conveyance, allowing faster drying speeds without compromising drying completeness or causing peeling.
3Device complexity
If conventional smooth guide rollers are used, then device complexity is low, but liquid peeling and image defects occur
Solution Approach 1:
The patent applies parameter change by modifying the surface roughness parameter of existing guide rollers to the optimal range (Ra 2-8 μm). This simple parameter adjustment maintains device complexity at a low level while effectively preventing liquid peeling and image 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 guide rollers with surface roughness of 2 to 8 micrometers effectively prevent liquid peeling and image defects, allowing for faster drying and reduced drying time without compromising image quality, as demonstrated by evaluation results showing optimal performance within this surface roughness range.
Implementation Method 1
the heater is configured to heat the drying target object while the plurality of guide rollers guides the drying target object
Implementation Method 2
The plurality of guide rollers includes at least one guide roller having a surface roughness of from 2 to 8
Data Source
AI summary
A drying device includes a plurality of guide rollers and a heater. The plurality of guide rollers is configured to contact a liquid applied face of a drying target object that is conveyed with liquid applied to the liquid applied face, while the drying target object is dried. The plurality of guide rollers includes at least one guide roller having a surface roughness of from 2 to 8. The heater is configured to heat the drying target object while the plurality of guide rollers guides the drying target object. A printer includes a liquid application device configured to apply liquid to a drying target object, and the drying device.