engleski

Voltage effect on developing process and B & W reproduction

In Electrophotography printing technique with liquid toners, large quantities of ink are deposited on photoreceptor. Voltage variations during the development phase (ΔV=200V) will directly influence the thickness of ink layer on photoreceptor. Optimal reproduction is achieved when smallest image elements (screen dots) have smallest possible diameter, and respectively higher optical density. Suitable method for reproduction analysis is based on spectrophotometric measurement of halftones and on optical densitometry. By adjusting the voltage during development (II. phase) will allow largest manipulation of color (ΔERR= 10.01). Optimal results are achieved with voltage of -125 V. Under this conditions, average printed screen element had average diameter of 56.9 μm and a maximum reflectance of R=33.50%. Variation of voltage on other two developing devices affect only slightly the color reproduction (ΔEDEV=1.26 ; ΔESQU=0.94.) and have lower impact on the size of screen elements (ΔdDEV=8.1 μm ; ΔdSQU=4.1 μm).

electrophotography ; developing devices ; ElectroInk ; screen reproduction

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