Determination of cleanliness level of foam reservoir

Details Determination of cleanliness level of foam reservoir Determination of cleanliness level of foam reservoir

1987-07-10

1989-12-12

Williams, Hezron E.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Lubricant testing

73 644, G01N 1100

Patent

active

048859320

ABSTRACT:
The cleanliness in foams used as ink reservoirs and ink delivery systems in ink-jet printing is determined by at least one of two methods. In the first method, the amount of non-volatile residues is measured. An amount of NVRs of less than about 0.2 wt/wt % is sufficient to provide adequate ink fluid properties. In the second method, the surface tension is measured for ink vehicle prior to and following exposure to the foam. For inks formulated for specially-coated paper printing, so long as the surface tension following exposure to the foam is at least about 40 dyne/cm, then adequate ink fluid properties are assured. For inks formulated for plain paper printing, so long as the drop in surface tension is less than about 7 dyne/cm as compared to ink vehicle not so exposed, then adequate ink fluid properties are assured.

REFERENCES:
patent: 3060318 (1962-10-01), Ouvrard
patent: 3618374 (1971-11-01), Miller
patent: 3913384 (1975-10-01), Furuya et al.
patent: 4269627 (1981-05-01), Hwang
patent: 4812492 (1989-03-01), Eckers et al.

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