Paper Expansion Ratio Measurement via Optical Absorption
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Solution Overview
Problem
Existing methods for measuring the expansion and contraction ratio of paper due to humidity changes are time-consuming and not suitable for quick assessments during printing processes, requiring dedicated devices and lengthy procedures.
Innovation Solution
An information processing system using a sensor device to irradiate paper with light in specific wavelength bands (1450 nm or 2900 nm) to detect absorption caused by H-O-H motion, calculating absorption information, and employing a prediction model to determine the expansion and contraction ratio, enabling rapid and accurate calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the standard measurement method is used to measure expansion and contraction ratio, then measurement accuracy is improved, but measurement time increases significantly
Solution Approach 1:
The patent replaces the mechanical measurement system (physical dimension measurement after humidity adjustment) with an optical measurement system. The optical measurement unit uses light absorption characteristics at specific wavelengths (1450 nm or 2900 nm) to detect water content in paper, which correlates with expansion and contraction ratio. This substitution enables rapid measurement without the time-consuming process of adjusting humidity and physically measuring dimensions.
Solution Approach 2:
The patent introduces water content as an intermediary parameter to indirectly measure expansion and contraction ratio. Instead of directly measuring paper dimensions after humidity adjustment, the system measures water content through light absorption and uses this as a proxy indicator. The conversion unit then transforms this intermediary measurement into the desired expansion and contraction ratio value, significantly reducing measurement time while maintaining accuracy.
2Measurement precision
If dedicated measurement devices are used, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the measurement system universal by using light absorption measurement, which can detect water content in various materials beyond just paper. The same optical measurement unit and measurement principle can be applied to different substrates, making the device multi-functional. This universality reduces the need for dedicated specialized devices for each material type, simplifying overall system complexity while maintaining measurement accuracy.
Solution Approach 2:
The patent replaces complex mechanical measurement devices (calipers, micrometers, humidity chambers) with a simpler optical measurement system. The optical unit measures light absorption at specific wavelengths to determine water content, which then correlates to expansion and contraction characteristics. This substitution eliminates the need for complex mechanical adjustment mechanisms and dimension measurement equipment, reducing device complexity while preserving measurement capability.
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
Enables quick and precise determination of paper dimensions in varying environments, allowing for image adjustments based on current expansion and contraction states, ensuring consistent image sizes on both sides in two-sided printing.
Implementation Method 1
the sensor device irradiates target paper with light in an absorption band and detects light in the absorption band that is transmitted through the paper and caused by expansion and contraction motion of H-O-H
Data Source
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AI summary
An information processing system includes a processor and a sensor device, in which the sensor device irradiates target paper with light and detects light in an absorption band that is transmitted through the paper and caused by an expansion and contraction motion of H-O-H, and the processor is configured to: calculate absorption information indicating an absorption amount in the absorption band by the paper on the basis of a detection result by the sensor device; and calculate an expansion and contraction ratio of the paper corresponding to the calculated absorption information using a prediction model that predicts the expansion and contraction ratio of the paper from the absorption information of the absorption band in the paper.