Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1997-07-16
1999-03-02
Williams, Hezron
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
73 5431, 73 6143, 422 681, 36632594, G01N 1114, B01F 1500
Patent
active
058774106
ABSTRACT:
Methods and apparatus that simulate the environment and conditions to which printers ink is subjected by the rollers and roller nips of a printing process, as well as determine the rheological characteristics of such ink across a range of water concentrations is disclosed, thus permitting a printing press operator to be assured of consistent ink film splitting (in "wet on wet" printing process), good ink to paper adhesion, good lithographic stability of inks or varnishes and good adhesion of one ink color to another ink color (i.e.--elimination of color chasing). The prior art is now benefited by helping to ensure that these inks, shellacs and varnishes function properly by keeping the amount of water added to the material within an acceptable range, despite the now known changes to rheological characteristics of printers ink caused by continuous hammering or pounding while subjected to action of roller nips in a printing press. To simulate such roller nips and determine rheology at various water concentrations and at different degrees of pounding or hammering, the apparatus uses a mixing member with a plurality of blades, which blades conform to the inside surface of a mixing cup; and which apparatus measures the force coupled by the ink/) varnish/shellac between the mixing member, as rotated at a selected constant speed by a precise motor, and the mixing cup, as water is added at a selected rate while hammering or pounding occurs, and/ or temperature changes of the ink/varnish/shellac occur.
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Wiggins J. David
Williams Hezron
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