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Drying Rate Monitor for Liquid Developer Copy Machines

IP.com Disclosure Number: IPCOM000094620D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Lahr, RJ: AUTHOR

Abstract

Liquid toning of electrostatic images involves immersion of an electrostatic latent image in developer fluid. This fluid is an ink toner suspended or dissolved in a dielectric liquid. The ink toner migrates to the image regions of the charged copy paper during its passage through the developer bath. The copy paper should be free of the dielectric liquid by the time the copy paper emerges from the developing machine. An analog drying rate monitor is used with such a system.

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Drying Rate Monitor for Liquid Developer Copy Machines

Liquid toning of electrostatic images involves immersion of an electrostatic latent image in developer fluid. This fluid is an ink toner suspended or dissolved in a dielectric liquid. The ink toner migrates to the image regions of the charged copy paper during its passage through the developer bath. The copy paper should be free of the dielectric liquid by the time the copy paper emerges from the developing machine. An analog drying rate monitor is used with such a system.

In the upper drawing, copy paper 3 is emerging from developer tank 1. The copy paper is dried by conveying it upwards on screen wire belts 2. Drying apparatus 4, consisting of heaters and fans, is shown at the right for pictorial clarity. At the left is the analog drying rate sensor. This consists of porous belt or screen 12 which passes through a tank containing the solvent liquid 11 and no toner ink. Screen 12 retains a certain portion of liquid 11 as it moves upwards. Screen 12 is chosen to have approximately the same retention characteristics as the paper surface.

Screen 12 is also dried by drying apparatus 4. The solvent evaporates at about the same rate as the solvent on the copy paper. If a screen mesh gives too much surface exposure compared to the paper, a stationary, solid back can be used. When screen 12 reaches air hose 7 and air vane 6, passage of air through screen 12 at this point depends heavily on the evaporation rate of the solvent. When air vane 6 remains unactuated, the drying rate...