Drying Device Moisture Detection Sheet Deformation Control
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Solution Overview
Problem
Inkjet image forming apparatuses face challenges in efficiently drying images on continuous business form sheets, leading to issues like image transfer, roller staining, and sheet deformation due to inadequate or excessive drying energy, which is influenced by moisture content ratio differences between print and blank parts.
Innovation Solution
A drying device with a detection unit to measure moisture content ratios of test print and blank parts, and a control unit to adjust drying strength and conveying speed based on these measurements, ensuring optimal drying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drying energy is increased to prevent image transfer and roller staining, then drying effectiveness is improved, but sheet deformation occurs
Solution Approach 1:
The system performs preliminary measurement of moisture content ratios in both print and blank parts before drying. Based on these measurements, the control unit calculates a drying energy level that will achieve effective drying without causing deformation, allowing the drying process to be optimized in advance rather than using fixed high energy levels
Solution Approach 2:
The system changes the drying energy parameter dynamically based on measured moisture content ratios. The control unit adjusts drying energy levels according to the specific moisture conditions detected in the print and blank parts, optimizing the balance between drying effectiveness and preventing sheet deformation for each specific printing condition
2Manufacturing precision
If drying energy is increased to ensure complete drying, then image quality is improved, but manufacturing cost increases
Solution Approach 1:
The system optimizes energy consumption by adjusting drying energy parameters based on actual moisture content measurements. Instead of using consistently high energy levels, the system tailors drying energy to the specific moisture conditions detected in print and blank parts, achieving complete drying while minimizing unnecessary energy expenditure
Solution Approach 2:
The system uses feedback from moisture content ratio measurements to control drying energy levels. The detection unit continuously monitors moisture content in both print and blank parts, and the control unit adjusts drying energy based on this feedback, ensuring complete drying only when and where needed, thereby reducing overall energy consumption
3Productivity
If conveying speed is increased to improve productivity, then output is improved, but drying effectiveness decreases
Solution Approach 1:
The system dynamically adjusts conveying speed based on measured moisture content ratios in both print and blank parts. When moisture content indicates a need for extended drying, the control unit reduces conveying speed to ensure adequate drying time. When moisture content is lower, the system can maintain higher conveying speeds, optimizing the balance between productivity and drying effectiveness for each specific condition
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 suppresses sheet deformation and image transfer, maintaining image quality by adjusting drying energy according to moisture content ratios, thereby optimizing the drying process.
Implementation Method 1
a drying unit configured to dry a recording medium having an image formed thereon
Implementation Method 2
a detection unit configured to detect a moisture content ratio of a print part having predetermined density and size and formed on the recording medium and a moisture content ratio of a blank part
Data Source
AI summary
There is provided a drying device. A drying unit is configured to dry a recording medium having an image formed thereon by an image forming unit. A detection unit is configured to detect a moisture content ratio of a print part having predetermined density and size and formed on the recording medium and a moisture content ratio of a blank part, which is a region of the recording medium on which an image is not formed, before the recording medium having the image formed thereon is conveyed to the drying unit by a conveyance unit. A control unit is configured to control at least one of a drying strength of the drying unit and a conveying speed of the conveyance unit on the basis of the moisture content ratio of the print part and the moisture content ratio of the blank part.