UV Varnish Curing Control for Carbon-Black Toner Images
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Solution Overview
Problem
Existing image forming systems face issues with discoloration of toner images when a varnish image is formed superposedly on a toner image containing carbon black due to heat generation from ultraviolet radiation, particularly affecting black toner images.
Innovation Solution
The system controls the conveying speed of the recording material and adjusts the intensity of ultraviolet radiation based on the presence of black toner in the overlapping region, using a slower speed and reduced radiation intensity for black toner images to prevent heat generation and discoloration, while maintaining sufficient varnish curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ultraviolet radiation is applied to cure the varnish on the recording material with toner image containing carbon black, then the varnish is effectively cured, but heat is generated causing discoloration of the toner image
Solution Approach 1:
The patent applies different ultraviolet radiation intensities to different regions: lower intensity for areas with carbon black toner images and higher intensity for areas without carbon black. This local differentiation prevents heat-induced discoloration of carbon black toner while ensuring adequate varnish curing in other regions.
Solution Approach 2:
The patent dynamically adjusts the ultraviolet radiation intensity parameter based on the presence of carbon black in the toner image. By changing the radiation intensity parameter locally, the system optimizes the balance between varnish curing effectiveness and prevention of toner image discoloration.
2Productivity
If the conveying speed is increased to maintain productivity, then production efficiency is improved, but the ultraviolet radiation exposure time is reduced leading to insufficient varnish curing
Solution Approach 1:
The patent implements local quality control by adjusting ultraviolet radiation intensity according to the specific region's requirements. Areas with carbon black receive lower intensity radiation to prevent discoloration, while other areas receive higher intensity to ensure complete curing, even at higher conveying speeds.
Solution Approach 2:
The system dynamically adjusts the ultraviolet radiation intensity based on real-time detection of carbon black presence in the toner image. This dynamic adaptation allows the system to maintain both high productivity and effective varnish curing by optimizing radiation parameters during the conveying process.
3Manufacturing precision
If lower ultraviolet radiation intensity is used to prevent carbon black discoloration, then toner image quality is preserved, but varnish curing effectiveness is reduced
Solution Approach 1:
The patent applies the principle of local quality by differentiating ultraviolet radiation intensity based on the presence of carbon black. Regions containing carbon black receive lower intensity radiation to preserve toner image quality, while regions without carbon black receive higher intensity radiation to ensure complete varnish curing.
Solution Approach 2:
The system changes the ultraviolet radiation intensity parameter dynamically based on the detected presence of carbon black in the toner image. This parameter adjustment allows the system to optimize both toner image quality preservation and varnish curing effectiveness in different regions simultaneously.
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
This approach effectively prevents discoloration of toner images by suppressing heat generation from carbon black, ensuring high-quality image formation without compromising productivity.
Implementation Method 1
an irradiation unit configured to irradiate the varnish on the recording material with light to cure the varnish on the recording material during conveyance of the recording material by the conveying unit
Implementation Method 2
discoloration of toner images when a varnish image is formed superposedly on a toner image containing carbon black due to heat generation from ultraviolet radiation
Data Source
AI summary
An image forming system includes an image forming unit, a varnish applying unit, a conveying unit, an irradiation unit, and a controller. The controller controls conveyance of a recording material so that a conveying speed of the recording material in a case that varnish is applied to the recording material with a toner image is formed is slower than a conveying speed of the recording material in a case that varnish is applied to the recording material with no toner image. The controller controls irradiation of the varnish with light so that intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material with the toner image is lower than intensity of the light with which the varnish is irradiated in a case that the varnish is applied to the recording material with no toner image.