Spectral Prediction Model For Variable Dot-size Ink Jet Presswoke

Recent ink jet printers using variable dot-size technology can improve printing quality,but the existing spectral reflectance model can’t predict the reflectivity of such printed matter.So this is necessary to develop a prediction model, which is capable of predicting variablepixels dot-size spectral reflectance.When ink jet printers’ drop volume change, assumed ink droplets are standard sphere,ink droplets formed FM dots are standard cylinder. As the droplet size changes, it will makethe change of ink thickness and the size of the FM dot. According to the relationship of theink droplet volume, ink thickness and FM dot-size, based on the Clapper-Yule model, wedevelop spectral prediction model for variable dot-size ink jet presswoke.This article analyzes the latest research results of the spectral prediction model fist. Thenaccording to the latest research results of the Clapper-Yule model, deduced the FM form ofthe Clapper-Yule model, which adapted to jet printers printed matter. According to theLambert-Beer law and the assumption, deduced the relationship between the drop volumechange and the transmission rate. At last, deduced spectral prediction model for monochromevariable ink drop volume printed matter, and based on the FM dot randomly distributed ordot-to-dot distributed, deduced two from of spectral prediction model for tri-color variabledrop ink-jet print printed. According to the model, used MATLAB simulation variabledroplet ink jet printers’ dot-size change. Compare with the predict values which notconsidered the impact of droplet volume change, the predict values which correctedtransmittance by droplet volume change is better precision.